CN106935832A - Lithium manganese phosphate composite, its preparation method and lithium ion battery - Google Patents
Lithium manganese phosphate composite, its preparation method and lithium ion battery Download PDFInfo
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Abstract
The invention provides a kind of lithium manganese phosphate composite, including：LiMnPO4Core, is coated on LiMnPO4The LiNbO of core surfaces3Layer, is coated on LiNbO3C layers of layer surface.Present invention also provides the preparation method of lithium manganese phosphate composite, comprise the following steps：Lithium source, niobium source, carbon containing complexing agent are mixed with solvent, niobium salting liquid is obtained；Lithium manganese phosphate nano particle is mixed with the niobium salting liquid, is dried after reaction, obtain complex coacervation compound；By the once sintered rear grinding of the complex coacervation compound, then double sintering is carried out, obtain lithium manganese phosphate composite.The preparation process is simple of the application lithium manganese phosphate composite, it is easy to control, modified composite has the advantages that specific discharge capacity high, good rate capability and has extended cycle life.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to lithium manganese phosphate composite, its preparation method and lithium
Ion battery.
Background technology
The energy is developing national economy and the important substance basis uplifted the people's living standard, and is also to directly affect economic hair
One key factor of exhibition.Since 21 century, shortage of resources that traditional energy utilization patterns are brought, environmental pollution,
The problems such as greenhouse effects, becomes increasingly conspicuous, and improves energy resource structure, and exploitation is efficient, cleaning novel energy has turned into whole world common recognition.
In numerous secondary cell systems, operating voltage is high, energy density is big, cycle life because having for lithium ion battery
The advantages of long and environmental protection, gained great popularity in current secondary cell in the market.
The polyanionic LiMnPO of olivine structural4Positive electrode is so that high voltage, security be good and Mn aboundresources etc.
Advantage, is sent to great expectations and is applied on electrokinetic cell.With the allomer body LiFePO for being now widely used for electrokinetic cell4Phase
Than, although theoretical capacity is identical (170mAh/g), but LiMnPO4With voltage platform (4.1V vs Li higher+/ Li) so that
Battery energy density improves about 20%.Therefore, LiMnPO is carried out4The related application research of positive electrode, has concurrently for exploitation
The high-performance lithium ion battery of new generation of long-life and high safety characteristic is significant.
However, LiMnPO4The electron conduction of material is poor, while its internal structure determines that being only lithium ion is provided with
The one-dimensional passage of limit so that lithium ion migration rate very little wherein at room temperature.The intrinsic crystal property of material causes it can
Inverse property is poor, and high rate performance is bad, and under the conditions of high current charge-discharge, electric field ladder very high is formed on electrode active material surface
Degree and concentration gradient, cause surface of active material structure to be readily broken, and cycle performance is not good under high magnification, using limited.
It is main at present to be changed by the means such as pattern control and reduction particle size, Surface coating conductive phase and ion doping
It is apt to its chemical property.Although particle nanosizing combination carbon coating can effectively shorten electric transmission and lithium ion diffusion path, and
Improve active particle between, the electronic conductivity between active material and collector, it is to avoid the generation of particle surface impurities phase, so as to have
Beneficial to the raising of material electrochemical activity.However, nano particle is easily reunited, hardly possible is coated, and is unfavorable for the making of electrode plates；And
Grain nanosizing can reduce the tap density of material, and in charge and discharge process, can aggravate the reaction with electrolyte, can weaken material
Expect the advantage in energy density and cyclical stability.It would therefore be highly desirable to provide a kind of other method that passes through to lithium manganese phosphate material
It is modified, so that it has preferable combination property as positive electrode.
The content of the invention
Present invention solves the technical problem that be that a kind of lithium manganese phosphate composite is provided, the lithium manganese phosphate that the application is provided
Composite has preferable cycle performance and high rate performance as the positive electrode of lithium ion battery.
In view of this, this application provides a kind of lithium manganese phosphate composite, including：LiMnPO4Core, is coated on
LiMnPO4The LiNbO of core surfaces3Layer, is coated on LiNbO3C layers of layer surface.
Preferably, in terms of the gross mass of lithium manganese phosphate composite, the LiNbO3The content of layer is 1wt%~5wt%,
Described C layers content is 1.2wt%~2.5wt%.
Present invention also provides a kind of preparation method of lithium manganese phosphate composite, comprise the following steps：
Lithium source, niobium source, carbon containing complexing agent are mixed with solvent, niobium salting liquid is obtained；
Lithium manganese phosphate nano particle is mixed with the niobium salting liquid, is dried after reaction, obtain complex coacervation compound；
By the once sintered rear grinding of the complex coacervation compound, then double sintering is carried out, obtain lithium manganese phosphate composite wood
Material.
Preferably, the lithium salts is one or more in lithium carbonate, lithium hydroxide and lithium acetate；The niobium source is oxalic acid
One or more in niobium ammonium, nitric acid niobium acyl and columbium pentachloride；The solvent is ethanol, ethylene glycol, deionized water and poly- propyl alcohol
In one or more；The carbon containing complexing agent be citric acid, ethylenediamine tetra-acetic acid and polyvinylpyrrolidone in one kind or
It is various.
Preferably, in the step of preparing niobium salting liquid, the temperature of the mixing is 60~95 DEG C, and the time is 0.5~3h,
The solid content of the niobium salting liquid is 10%~50%；In the step of preparing complex coacervation compound, the temperature of the reaction
It it is 40~80 DEG C, the time is 2~6h.
Preferably, in the step of obtaining lithium manganese phosphate composite, the once sintered temperature is 250~450 DEG C,
Time is 1~4h；The temperature of the double sintering is 650~850 DEG C, and the time is 4~10h；It is described once sintered with secondary burning
Knot is carried out under an inert atmosphere.
Preferably, the inert atmosphere is mixed gas, nitrogen or the argon gas of argon gas and hydrogen.
Present invention also provides a kind of lithium ion battery, including positive electrode and negative material, the positive electrode is upper
State the lithium manganese phosphate composite prepared by the preparation method described in described in scheme or such scheme.
This application provides a kind of lithium manganese phosphate composite, it includes：LiMnPO4Core, is coated on LiMnPO4Surface
LiNbO3Layer, is coated on LiNbO3C layers of layer surface.The application uses excellent lithium ion conductivity material LiNbO3Modification
In LiMnPO4The surface of nano-particle, to promote lithium ion in LiMnPO4The effective mobility of the contact interface of particle and electrolyte,
LiMnPO is improved simultaneously4Surface stability of the nano-particle under the conditions of high current charge-discharge, prevents electrolyte to LiMnPO4Receive
The corrosion of rice corpuscles and decomposition, so as to improve cycle life of the lithium manganese phosphate composite as positive electrode；Further,
LiNbO3Decorative layer is with carbon-coating in LiMnPO4Particle surface forms hybrid conductive network, improves LiMnPO4The electronics of particle is led
Electrical and ionic conductivity, improves high rate performance and cycle performance of the lithium manganese phosphate composite as positive electrode.
Brief description of the drawings
Fig. 1 is LiMnPO prepared by embodiment 14/LiNbO3The SEM figures of/C composite；
Fig. 2 is LiMnPO prepared by embodiment 14/LiNbO3The TEM figures of/C composite；
Fig. 3 is LiMnPO prepared by embodiment 24/LiNbO3The XRD of/C composite；
Fig. 4 is LiMnPO prepared by embodiment 34/LiNbO3The circulation figure of/C composite under 2C and 5C multiplying powers；
Fig. 5 is LiMnPO prepared by embodiment 44/LiNbO3Charging and discharging curve figure of/the C composite under different multiplying.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, but
It should be appreciated that these descriptions are simply to further illustrate the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
The embodiment of the invention discloses a kind of lithium manganese phosphate composite, including：LiMnPO4Core, is coated on LiMnPO4
The LiNbO on surface3Layer, is coated on LiNbO3C layers of layer surface.
This application provides a kind of lithium manganese phosphate composite, it is made up of core material with clad, wherein core material
Expect to be LiMnPO4, it is coated on LiMnPO4Surface is LiNbO3Layer, is coated on LiNbO3Layer surface is C layers, can be expressed as
LiMnPO4/LiNbO3/ C composite.
In lithium manganese phosphate composite, core material is lithium manganese phosphate nano particle, with lithium manganese phosphate composite
Gross mass meter, the clad LiNbO of the lithium manganese phosphate nano grain surface3The content of layer is 1~5wt%, in some implementations
In example, the LiNbO3The content of layer is 2~4wt%；LiNbO3The content of clad C layers of layer surface is 1.2~2.5%,
In some embodiments, described C layers content is 1.5~2wt%.
Present invention also provides a kind of preparation method of lithium manganese phosphate composite, comprise the following steps：
Lithium source, niobium source, carbon containing complexing agent are mixed with solvent, niobium salting liquid is obtained；
Lithium manganese phosphate nano particle is mixed with the niobium salting liquid, is dried after reaction, obtain complex coacervation compound；
By the once sintered rear grinding of the complex coacervation compound, then double sintering is carried out, obtain lithium manganese phosphate composite wood
Material.
In above process, the application is prepared for dissolving complete niobium salting liquid first by complex coacervation method, then to niobium
Lithium manganese phosphate nano particle is added in salting liquid, with the carrying out of reaction, niobium salt and lithium salts in solution have stepped through carbon containing network
Mixture effect is adsorbed in lithium manganese phosphate nano grain surface, and solution is changed into gel after reaction a period of time, after gel is dried
The complex coacervation compound of lithium manganese phosphate and niobium salt is obtained, and carbon containing complexing agent can form carbon coating layer under high temperature pyrolysis, because
This is finally by sintering lithium manganese phosphate composite of the synthesis with clad.
According to the present invention, during lithium manganese phosphate is prepared, the application is prepared for dissolving complete niobium salting liquid first,
Will lithium source, niobium source, carbon containing complex compound mix with solvent, obtain niobium salting liquid.In the process, lithium source, niobium source, carbon containing complexing
Agent is material well known to those skilled in the art with solvent, and this application is had no particular limits, example, the lithium source
Selected from one or more in lithium carbonate, lithium hydroxide and lithium acetate；The niobium source is selected from ammonium niobium oxalate, nitric acid niobium acyl and pentachloro-
Change one or more in niobium, in embodiment, the niobium source is selected from ammonium niobium oxalate or columbium pentachloride；The carbon containing complexing agent choosing
One or more from citric acid, ethylenediamine tetra-acetic acid and polyvinylpyrrolidone；The solvent be selected from ethanol, ethylene glycol,
One or more in deionized water and poly- propyl alcohol, in embodiment, the solvent is selected from deionized water, ethanol or ethylene glycol.
The temperature of the mixing is 60~90 DEG C, and in embodiment, the temperature of the mixing is 65~85 DEG C；The time of the mixing is
0.5~3h, in embodiment, the time of the mixing is 1~2h.The solid content of the niobium salting liquid is 10%~50%.Institute
Lithium source is stated with the niobium source according to Li ions therein and Nb ionometers, its mol ratio is 1:1, the carbon complexing agent and niobium source
Mass ratio is 1:1~3:1.
After niobium salting liquid is prepared for, then the complex coacervation compound of lithium manganese phosphate and lithium salts is prepared, will lithium manganese phosphate
Nano particle mixes with niobium salting liquid, is dried after reaction, obtains the complex coacervation compound of lithium manganese phosphate and lithium salts.Above-mentioned reaction
Happens is that chemical complexing reacts, niobium salt therein is adsorbed in lithium manganese phosphate nano particle table with lithium salts by the effect of complexing agent
Face, i.e., solution is changed into gel after described reaction.The temperature of the reaction is 40~80 DEG C, in embodiment, the reaction
Temperature is 50~60 DEG C, and the time of the reaction is 2~6h, and in embodiment, the time of the reaction is 3~5h.
The application has finally carried out the preparation of lithium manganese phosphate composite, will complex coacervation compound one obtained above
Ground after secondary sintering, then carry out double sintering, obtain lithium manganese phosphate composite.In said process, the above-mentioned suction for preparing
The lithium salts and niobium salt for being attached to lithium manganese phosphate surface react to form lithium niobate at high temperature, while as the organic matter high temperature of complexing agent
Pyrolysis forms carbon coating layer, finally gives lithium manganese phosphate composite.The once sintered temperature is 250~450 DEG C, in reality
Apply in example, the once sintered temperature is 300~400 DEG C, and the time is 1~4h, and in embodiment, the time of the sintering is
2~3h.The temperature of the double sintering is 650~850 DEG C, and in embodiment, the temperature of the double sintering is 700~800
DEG C, the time of the sintering is 4~10h, and in embodiment, the time of the sintering is 6~8h.It is described it is once sintered with it is secondary
Sintering carry out under an inert atmosphere, the inert atmosphere preferably in nitrogen, argon gas or nitrogen and the mixed gas of hydrogen, in reality
Apply in example, the inert atmosphere is argon gas atmosphere.Above-mentioned first sintering can decompose carbon containing complexing agent and niobium source, while abjection
The moisture of gel adsorption；Double sintering is carried out after grinding is uniform again, the crystallization of lithium niobate can be completed.
Present invention also provides a kind of lithium ion battery, it includes positive electrode and negative material, positive electrode therein
Lithium manganese phosphate composite prepared by preparation method described in described in such scheme or such scheme.
The present invention is from the material LiNbO with excellent lithium ion conductivity3To modify positive electrode LiMnPO4Nanometer
The surface of particle, to promote lithium ion in LiMnPO4The effective mobility of the contact interface of particle and electrolyte, while improving
LiMnPO4Surface stability of the nano-particle under the conditions of high current charge-discharge, prevents electrolyte to LiMnPO4Nano-particle
Corrosion and decomposition, so as to improve the cycle life of positive electrode.On the other hand, LiNbO3Decorative layer is with carbon-coating in LiMnPO4
The surface of grain forms hybrid conductive network, improves LiMnPO4The electron conduction and ionic conductivity of particle, improve material
High rate performance and cycle performance.
According to the present invention, after lithium manganese phosphate composite is prepared, dividing for composite microscopic appearance has been carried out
Analysis, by embodiment to LiMnPO4/LiNbO3The structural analysis of/C composite is it has furthermore been found that in LiNbO3Layer and
LiMnPO4The contact interface of particle two-phase forms a transitional region, has a small amount of manganese atom to enter into the transitional region
LiNbO3In crystalline phase, while a small amount of niobium atom can also enter into LiMnPO4In crystalline phase, so that a kind of structure of mutual doping is formed,
The two-phase interface that is formed as of this special structure and transitional region constructs a passage, reduces two-phase contact interface
Stress, substantially increases the electrical conductivity of composite, improves the electrochemical reaction dynamics of two-phase positive electrode, enhances lithium
The ability of diffusion and electric charge transfer of the ion from body phase to surface.
In sum, the preparation process of lithium manganese phosphate composite of the present invention is easily controllable, process is simple, and surface modification
Composite material granular surface-stable afterwards, as the positive electrode good rate capability of lithium ion battery, has extended cycle life.
For a further understanding of the present invention, the lithium manganese phosphate composite that is provided the present invention with reference to embodiment and its
Preparation method is described in detail, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
Weigh 0.342g columbium pentachlorides and 0.055g lithium hydroxides are added in 100mL ethylene glycol, and add gathering for 0.65g
Vinylpyrrolidone, control temperature obtains dissolving complete niobium salting liquid for 1 hour at 70 DEG C using electromagnetic agitation reaction；
Solution is then cooled to 50 DEG C and 4g lithium manganese phosphate nano particles are added, is sufficiently stirred for, make solid particle dispersions
Completely, after reacting 3 hours, solution is changed into gel, gel is taken out and vacuum drying chamber is positioned over, under 80 DEG C of temperature conditionss
Dried, obtained LiMnPO4/ complex coacervation containing niobium compound；
The LiMnPO that will be obtained4/ complex coacervation containing niobium compound is placed in argon gas atmosphere and is sintered under the conditions of 450 DEG C
1 hour, the powder that will be obtained was ground, and was again placed in carrying out double sintering 4 under the conditions of 850 DEG C in nitrogen atmosphere small
When, the lithium manganese phosphate composite Nano positive electrode being modified with surface is obtained, molecular formula is LiMnPO4/LiNbO3/ C, core is
LiMnPO4, cladding core LiMnPO4Be LiNbO3Layer, coats LiNbO3Layer is carbon-coating；LiNbO3The content of layer is 5wt%,
The content of carbon-coating is 2.5%wt.LiMnPO manufactured in the present embodiment4/LiNbO3The SEM figures of/C as shown in figure 1, as shown in Figure 1,
The particle of composite is tiny, is evenly distributed and without obvious agglomeration；TEM is schemed as shown in Fig. 2 as shown in Figure 2,
LiNbO3LiMnPO is covered in successively with amorphous carbon4Surface.
Embodiment 2
Weigh 0.157g ammonium niobium oxalates and 0.011g lithium hydroxides are added in 100mL deionized waters, and add 0.32g to gather
Vinylpyrrolidone, control temperature is reacted 2 hours at 85 DEG C using electromagnetic agitation, obtains dissolving complete niobium salting liquid；
Niobium salting liquid is then cooled to 40 DEG C and 4g lithium manganese phosphate nano particles are added, is sufficiently stirred for, make solid particle
Dispersion is complete, and after reacting 6 hours, solution is changed into gel, and gel is taken out and vacuum drying chamber is positioned over, in 80 DEG C of temperature strips
Dried under part, obtained LiMnPO4/ complex coacervation containing niobium compound；
The LiMnPO that will be obtained4It is small that/complex coacervation containing niobium compound is placed in argon gas atmosphere the sintering 3 under the conditions of 300 DEG C
When, the powder that will be obtained is ground, and is again placed in argon gas atmosphere double sintering 10 hours under the conditions of 650 DEG C, obtaining
With the lithium manganese phosphate composite Nano positive electrode that surface is modified, molecular formula is LiMnPO4/LiNbO3/ C, core is LiMnPO4,
Cladding core LiMnPO4Be LiNbO3Layer, coats LiNbO3Layer is carbon-coating；LiNbO3The content of layer is 1wt%, carbon-coating
Content is 1.6wt%.The XRD of lithium manganese phosphate composite manufactured in the present embodiment is detected as shown in figure 3, Fig. 3 includes two groups
Diffraction maximum, the diffraction maximum on top is the diffraction maximum of lithium manganese phosphate composite manufactured in the present embodiment, and the diffraction maximum of bottom is phosphorus
The base peak of sour manganese lithium；From the figure 3, it may be seen that LiNbO3Addition do not change LiMnPO4Crystal structure, and composite crystallize
It is functional.
Embodiment 3
Weigh 0.137g columbium pentachlorides and 0.033g lithium acetates are added in 100mL ethanol, and add the lemon of 0.411g
Acid, control temperature obtains dissolving complete niobium salting liquid for 3 hours at 60 DEG C using electromagnetic agitation reaction；
Solution is then cooled to 60 DEG C and 4g lithium manganese phosphate nano particles are added, is sufficiently stirred for, make solid particle dispersions
Completely, after reacting 2 hours, solution is changed into gel, gel is taken out and vacuum drying chamber is positioned over, under 80 DEG C of temperature conditionss
Dried, obtained LiMnPO4/ complex coacervation containing niobium compound；
The LiMnPO that will be obtained4/ complex coacervation containing niobium compound is placed in argon gas atmosphere and is sintered under the conditions of 250 DEG C
4 hours, the powder that will be obtained was ground, and was again placed in carrying out double sintering 6 under the conditions of 700 DEG C in nitrogen atmosphere small
When, the lithium manganese phosphate composite Nano positive electrode being modified with surface is obtained, molecular formula is LiMnPO4/LiNbO3/ C, core is
LiMnPO4, cladding core LiMnPO4Be LiNbO3Layer, coats LiNbO3Layer is carbon-coating；LiNbO3The content of layer is 2wt%,
The content of carbon-coating is 2wt%.LiMnPO manufactured in the present embodiment4/LiNbO3The circulation figure such as Fig. 4 institutes of/C under 2C and 5C multiplying powers
Show, as a result show, capability retention of the composite after the circle of circulation 300 under 2C and 5C multiplying powers is respectively 98.1% He
95.3%.
Embodiment 4
Weigh 0.471g ammonium niobium oxalates and 0.028g lithium carbonates are added in 100mL deionized waters, and add 0.471g's
Ethylenediamine tetra-acetic acid, control temperature obtains dissolving complete niobium salting liquid for 0.5 hour at 95 DEG C using electromagnetic agitation reaction；
Solution is then cooled to 40 DEG C and 4g lithium manganese phosphate nano particles are added, is sufficiently stirred for, make solid particle dispersions
Completely, after reacting 5 hours, solution is changed into gel, gel is taken out and vacuum drying chamber is positioned over, under 80 DEG C of temperature conditionss
Dried, obtained LiMnPO4/ complex coacervation containing niobium compound；
The LiMnPO that will be obtained4/ complex coacervation containing niobium compound is placed in argon gas atmosphere and is sintered under the conditions of 300 DEG C
3 hours, the powder that will be obtained was ground, and was again placed in carrying out double sintering 8 under the conditions of 650 DEG C in argon gas atmosphere small
When, the lithium manganese phosphate composite Nano positive electrode being modified with surface is obtained, molecular formula is LiMnPO4/LiNbO3/ C, core is
LiMnPO4, cladding core LiMnPO4Be LiNbO3Layer, coats LiNbO3Layer is carbon-coating；LiNbO3The content of layer is 3wt%,
The content of carbon-coating is 2.1wt%.LiMnPO manufactured in the present embodiment4/LiNbO3Charging and discharging curves of/the C under different multiplying is as schemed
Shown in 5, it is illustrated that show, capacity of the composite under 0.1C, 1C, 2C, 5C be respectively 151.6mAh/g, 123.4mAh/g,
119.0mAh/g and 106.2mAh/g.
The explanation of above example is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that right
For those skilled in the art, under the premise without departing from the principles of the invention, the present invention can also be carried out
Some improvement and modification, these are improved and modification is also fallen into the protection domain of the claims in the present invention.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (8)
1. a kind of lithium manganese phosphate composite, including：LiMnPO4Core, is coated on LiMnPO4The LiNbO of core surfaces3Layer, bag
It is overlying on LiNbO3C layers of layer surface.
2. lithium manganese phosphate composite according to claim 1, it is characterised in that with total matter of lithium manganese phosphate composite
Gauge, the LiNbO3The content of layer is 1wt%~5wt%, and described C layers content is 1.2wt%~2.5wt%.
3. a kind of preparation method of lithium manganese phosphate composite, comprises the following steps：
Lithium source, niobium source, carbon containing complexing agent are mixed with solvent, niobium salting liquid is obtained；
Lithium manganese phosphate nano particle is mixed with the niobium salting liquid, is dried after reaction, obtain complex coacervation compound；
By the once sintered rear grinding of the complex coacervation compound, then double sintering is carried out, obtain lithium manganese phosphate composite.
4. preparation method according to claim 3, it is characterised in that the lithium salts is lithium carbonate, lithium hydroxide and acetic acid
One or more in lithium；The niobium source is one or more in ammonium niobium oxalate, nitric acid niobium acyl and columbium pentachloride；The solvent
It is one or more in ethanol, ethylene glycol, deionized water and poly- propyl alcohol；The carbon containing complexing agent is citric acid, ethylenediamine tetraacetic
One or more in acetic acid and polyvinylpyrrolidone.
5. preparation method according to claim 3, it is characterised in that in the step of preparing niobium salting liquid, the mixing
Temperature be 60~95 DEG C, the time is 0.5~3h, and the solid content of the niobium salting liquid is 10%~50%；It is solidifying complexing is prepared
In the step of glue compound, the temperature of the reaction is 40~80 DEG C, and the time is 2~6h.
6. preparation method according to claim 3, it is characterised in that in the step of obtaining lithium manganese phosphate composite,
The once sintered temperature is 250~450 DEG C, and the time is 1~4h；The temperature of the double sintering is 650~850 DEG C, when
Between be 4~10h；It is described once sintered to be carried out under an inert atmosphere with double sintering.
7. preparation method according to claim 6, it is characterised in that the inert atmosphere is the gaseous mixture of argon gas and hydrogen
Body, nitrogen or argon gas.
8. a kind of lithium ion battery, including positive electrode and negative material, it is characterised in that the positive electrode is claim
The lithium manganese phosphate composite prepared by preparation method described in described in 1~2 any one or any one of claim 3~7.
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| CN114566625A (en) * | 2022-03-02 | 2022-05-31 | 重庆理英新能源科技有限公司 | Lithium-rich manganese-based positive electrode material with low pressure drop performance and preparation method and application thereof |
| CN114784283A (en) * | 2022-05-30 | 2022-07-22 | 深圳市德方纳米科技股份有限公司 | Coated positive electrode material and preparation method and application thereof |
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