CN103151555A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN103151555A CN103151555A CN2011104024656A CN201110402465A CN103151555A CN 103151555 A CN103151555 A CN 103151555A CN 2011104024656 A CN2011104024656 A CN 2011104024656A CN 201110402465 A CN201110402465 A CN 201110402465A CN 103151555 A CN103151555 A CN 103151555A
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- lithium ion
- ion battery
- current collector
- collecting body
- plus plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a lithium ion battery, comprising a battery shell. The battery shell is provided with a positive electrode current collector, a negative electrode current collector, a separation membrane and an electrolyte solution, wherein the positive electrode current collector is coated by a positive electrode active material and retains an exposed area; the negative electrode current collector is coated by a negative electrode active material; the separation membrane is disposed between the positive electrode current collector and the negative electrode current collector so as to play a separation role; the electrolyte solution is filled among the positive electrode current collector, the negative electrode current collector, the separation membrane and the battery shell; and the positive electrode current collector, the negative electrode current collector and the separation membrane are wound into preset shapes. According to the lithium ion battery provided by an embodiment of the invention, coating structures of electrodes of the lithium ion battery are changed and the changed electrodes are assembled into batteries, so that activation time of the battery can be shortened and the cycle performance of the battery is improved, and the improvement of the cycle performance can prolong the service life of a new energy automobile.
Description
Technical field
The invention belongs to technical field of electrochemistry, more specifically, the present invention relates to a kind of lithium ion battery.
Background technology
The tradition fuel-engined vehicle has consumed a large amount of petroleum resources, so the automobile that taps a new source of energy is the only way of China Automobile Industry.New-energy automobile is comprised of three large critical pieces: motor, automatically controlled, battery, and the height of battery performance has important impact to the industrialization of new-energy automobile.In recent years, battery becomes the energy-accumulating medium of emerging energy gradually, simultaneously more and more plays important effect as the power supply of portable electric appts industrial.Lithium ion battery has the characteristics of high-energy-density and high power density, is generally considered optimal portable power supplies.In the middle of lithium ion battery miscellaneous, circular lithium ion battery has the advantage of volumetric specific energy maximum.At present, the time that manufacturer activates in producing the battery link is longer, thereby has extended the production cycle of battery; And the cycle life of battery is the problem that the consumer is concerned about always.Many researchers and scientific worker solve the problem of above-mentioned two aspects by various technological means, but there is no breakthrough.
Summary of the invention
The present invention is intended to one of solve the problems of the technologies described above at least.
For this reason, one object of the present invention is to propose a kind of lithium ion battery.
Lithium ion battery according to the embodiment of the present invention comprises battery case, is provided with in described battery case: plus plate current-collecting body is coated with positive electrode active material and leaves exposed region on described plus plate current-collecting body; Negative current collector is coated with negative electrode active material on described negative current collector; Barrier film, described barrier film between described plus plate current-collecting body and described negative current collector to play a compartmentation; And electrolyte, described electrolyte is filled between described plus plate current-collecting body, negative current collector, barrier film and described battery case, and wherein, described plus plate current-collecting body, negative current collector and barrier film are wound into predetermined shape.
Lithium ion battery according to the embodiment of the present invention, due to the applying structure that has changed lithium ion cell electrode, electrode assembling after changing is become battery, can shorten the soak time of battery and the cycle performance of raising battery, the raising of cycle performance can extend the useful life of new-energy automobile.
In addition, lithium ion battery according to the above embodiment of the present invention can also have following additional technical characterictic:
According to one embodiment of present invention, described plus plate current-collecting body is rectangular, and described exposed region becomes ribbon to connect any two opposite side of described plus plate current-collecting body.
According to one embodiment of present invention, described exposed area field width 1-3mm.
According to one embodiment of present invention, described exposed region is provided with 1-3.
According to one embodiment of present invention, described plus plate current-collecting body material is aluminium foil.
According to one embodiment of present invention, described positive electrode active material is transition metal oxide.
According to one embodiment of present invention, described transition metal oxide is LiCoO
2Or LiNi
1/3Co
1/3Mn
1/3O
2Or both mixtures.
According to one embodiment of present invention, described negative current collector is Copper Foil.
According to one embodiment of present invention, described negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
According to one embodiment of present invention, described diaphragm material is at least a in polyethylene or polypropylene.
According to one embodiment of present invention, described electrolyte be DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate one or more.Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the preparation method's schematic flow sheet according to the lithium ion battery of the embodiment of the present invention;
Fig. 2 is a kind of coating schematic diagram according to the lithium ion cell positive of the embodiment of the present invention;
Fig. 3 is the another kind coating schematic diagram according to the lithium ion cell positive of the embodiment of the present invention;
Fig. 4 is the coating schematic diagram of conventional li-ion electrode coating process;
Fig. 5 is two kinds of coating process gained lithium ion battery C of one embodiment of the present of invention and the discharge cycles number of times comparison diagram of D;
Fig. 6 is two kinds of coating process gained lithium ion battery E of one embodiment of the present of invention and the discharge cycles number of times comparison diagram of F.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
in description of the invention, it will be appreciated that, term " " center ", " vertically ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, need to prove, unless clear and definite regulation and restriction are separately arranged, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be to be fixedly connected with, connect integratedly, can be also to removably connect; Can be mechanical connection or electrical connection, can be also the connection of two element internals; Can be directly to be connected, also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
At first, the flow process of the method for preparing lithium ion battery involved in the present invention is described with reference to figure 1.
Concrete, the method for the lithium ion battery of the preparation embodiment of the present invention involved in the present invention comprises the following steps:
Be coated with positive electrode active material so that described surface comprises dispensing area and exposed region at the plus plate current-collecting body upper surface;
Be coated with negative electrode active material on negative current collector;
Reel and put into battery case being coated with the plus plate current-collecting body of described positive electrode active material, the negative current collector that is coated with described negative electrode active material and barrier film; And
Inject electrolyte in battery case, and with described battery case sealing, obtain lithium ion battery.
Described coating process at plus plate current-collecting body surface-coated positive electrode active material does not have particular restriction, if can be on described plus plate current-collecting body surface-coated positive electrode active material, and the exposed region of vacating uncoated positive electrode active material gets final product.
Thus, can shorten the soak time of whole battery, and then the production efficiency of raising battery, reduce and avoid battery to analyse the problem of lithium because electric liquid diffusion velocity in the whole system causes negative terminal surface slowly, certain expansion space can also be provided in cyclic process for negative pole, thereby avoid the negative pole expansion to produce and analyse the cycle life that lithium is improved lithium ion battery, improve the cycle performance of battery.
Advantageously, described plus plate current-collecting body is rectangular, described exposed region becomes ribbon to connect any two opposite side of described plus plate current-collecting body, as shown in Figures 2 and 3, Fig. 2 represents that described exposed region 10 connects shorter two opposite side of described plus plate current-collecting body 20, and Fig. 3 represents that described exposed region 10 connects long two opposite side of described plus plate current-collecting body 20.
Advantageously, described exposed area field width 1-3mm.
Further advantageously, described exposed region is provided with 1-3, preferred two exposed regions.Thus, can improve the cycle life of battery.
In one example, the preparation material of described plus plate current-collecting body is aluminium foil.
In one example, described positive electrode active material is transition metal oxide.
Advantageously, described transition metal oxide is LiCoO
2Or LiNi
1/3Co
1/3Mn
1/3O
2Or both mixtures.
The described method that is coated with negative electrode active material on negative current collector does not have particular restriction, can adopt conventional coating process coating, and in one example, described negative current collector is Copper Foil.
Advantageously, described negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
Then, reel and put into battery case being coated with the plus plate current-collecting body of described positive electrode active material, the negative current collector that is coated with described negative electrode active material and barrier film, described method for winding can be conventional method for winding, be rolled into round utmost point utmost point group and get final product being coated with the plus plate current-collecting body of described positive electrode active material, the negative current collector that is coated with described negative electrode active material and barrier film, reel and round utmost point utmost point group is put into battery case after completing.
Advantageously, described diaphragm material is at least a in polyethylene or polypropylene.
At last, inject electrolyte in battery case, and with described battery case sealing, obtain lithium ion battery, described method for implanting and encapsulating method do not have particular restriction, adopt conventional injection device and sealing device to get final product complete operation.
Advantageously, described electrolyte is one or more of DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate.
Thus, just can complete the preparation of lithium ion battery.
The below further describes the lithium ion battery that is made by said method.
Prepare the gained lithium ion battery by said method and comprise battery case, be provided with in described battery case:
Plus plate current-collecting body is coated with positive electrode active material and leaves exposed region on described plus plate current-collecting body;
Negative current collector is coated with negative electrode active material on described negative current collector;
Barrier film, described barrier film between described plus plate current-collecting body and described negative current collector to play a compartmentation; With
Electrolyte, described electrolyte are filled between described plus plate current-collecting body, negative current collector, barrier film and described battery case,
Wherein, described plus plate current-collecting body, negative current collector and barrier film are wound into predetermined shape.
In one example, described plus plate current-collecting body is rectangular before coiling, and described exposed region becomes ribbon to connect any two opposite side of described plus plate current-collecting body.
In one example, described exposed area field width 1-3mm.
In one example, described exposed region is provided with 1-3.
In one example, described plus plate current-collecting body material is aluminium foil.
In one example, described positive electrode active material material is transition metal oxide.
In one example, described transition metal oxide comprises LiCoO
2Or LiNi
1/3Co
1/3Mn
1/3O
2Or the transition metal oxide of both mixing.
In one example, described negative current collector is Copper Foil.
In one example, described negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
In one example, described diaphragm material is at least a in polyethylene or polypropylene.
In one example, described electrolyte is one or more of DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate.
Below by specific embodiment, the present invention is described.
Embodiment 1
Select aluminium foil as plus plate current-collecting body, select LiCoO
2As positive electrode active material, with LiCoO
2Be coated on uniformly on aluminium foil according to Fig. 2 and pattern shown in Figure 4, wherein Fig. 4 is conventional coating process coating style; Select Copper Foil as negative current collector, selecting graphite is that negative electrode active material is coated on Copper Foil uniformly.
Then will be coated with LiCoO according to a conventional method
2The barrier film made of aluminium foil, the Copper Foil that is coated with graphite and polyethylene reel and put into battery case.
At last, injecting lithium hexafluoro phosphate as electrolyte in battery case, and with described battery case sealing, obtain lithium ion battery, wherein, is A according to coating process coating gained battery mark shown in Figure 2, is B according to coating process coating gained battery mark shown in Figure 4.
Two kinds of coating process gained lithium ion batteries are activated test, test procedure is: at first under the 0.1C condition, respectively A and two kinds of lithium ion batteries of B are activated 1 hour, carry out 0.5C battery after activation is stored respectively 12 hours, 24 hours and 48 hours under 25 ℃ of conditions after and once discharge and recharge, the anatomic observation negative terminal surface is analysed the appearance of lithium phenomenon when full electric attitude; Carry out 0.5C battery after activation is stored respectively 12 hours, 24 hours and 48 hours under 45 ℃ of conditions after and once discharge and recharge, the anatomic observation negative terminal surface is analysed the appearance of lithium phenomenon when full electric attitude; Carry out 0.5C battery after activation is stored respectively 12 hours, 24 hours and 48 hours under 65 ℃ of conditions after and once discharge and recharge, the anatomic observation negative terminal surface is analysed the appearance of lithium phenomenon when full electric attitude, and observed result sees Table 1.
Lithium Phenomena Observation table is analysed on table 1 lithium ion battery negative surface
Annotate: ◎ represents that negative terminal surface occurs without analysing the lithium phenomenon; * expression negative terminal surface is analysed the lithium phenomenon and is occurred.
Embodiment 2
Select aluminium foil as plus plate current-collecting body, select LiCoO
2As positive electrode active material, with LiCoO
2Be coated on uniformly on aluminium foil according to Fig. 2 and pattern shown in Figure 4, wherein Fig. 4 is conventional coating process coating style; Select Copper Foil as negative current collector, selecting graphite is that negative electrode active material is coated on Copper Foil uniformly.
Then will be coated with LiCoO according to a conventional method
2The barrier film made of aluminium foil, the Copper Foil that is coated with graphite and polyethylene reel and put into battery case.
At last, injecting lithium hexafluoro phosphate as electrolyte in battery case, and with described battery case sealing, obtain lithium ion battery, wherein, is C according to coating process coating gained battery mark shown in Figure 2, is D according to coating process coating gained battery mark shown in Figure 4.
Two kinds of coating process gained lithium ion batteries are carried out the cycle life experiment, test procedure is: at first under the 0.1C condition, respectively to two kinds of lithium ion battery activation 1 hour, carry out again the activation of 1 day under 60 ℃, then carry out the test of 0.5C charge and discharge cycles under 60 ℃, record cycle-index, record the results are shown in Figure the discharge cycles number of times comparison diagram that 5, Fig. 5 is two kinds of coating process gained lithium ion battery C and D.
Embodiment 3
Select aluminium foil as plus plate current-collecting body, select LiCoO
2And LiNi
1/3Co
1/3Mn
1/3O
2Mixture as positive electrode active material, with LiCoO
2And LiNi
1/3Co
1/3Mn
1/3O
2Mixture be coated on uniformly on aluminium foil according to Fig. 3 and pattern shown in Figure 4, wherein Fig. 4 is conventional coating process coating style; Select Copper Foil as negative current collector, selecting graphite is that negative electrode active material is coated on Copper Foil uniformly.
Then will be coated with LiCoO according to a conventional method
2The barrier film made of aluminium foil, the Copper Foil that is coated with graphite and polyethylene reel and put into battery case.
At last, injecting lithium hexafluoro phosphate as electrolyte in battery case, and with described battery case sealing, obtain lithium ion battery, wherein, is E according to coating process coating gained battery mark shown in Figure 2, is F according to coating process coating gained battery mark shown in Figure 4.
Two kinds of coating process gained lithium ion batteries are carried out the experiment of normal temperature cycle life, test procedure is: at first under the 0.1C condition, respectively to two kinds of lithium ion battery activation 1 hour, carry out again the activation of 1 day under 60 ℃, then at room temperature carry out the test of 0.5C charge and discharge cycles, record cycle-index, record the results are shown in Figure the discharge cycles number of times comparison diagram that 6, Fig. 6 is two kinds of coating process gained lithium ion battery E and F.
As can be seen from the above Table 1, without analysing the lithium ion battery of lithium phenomenon time of occurrence early than the conventional method preparation, namely shorter according to the soak time of the lithium ion battery of the embodiment of the present invention according to the negative terminal surface of the lithium ion battery of the embodiment of the present invention; Can be found out by embodiment 2 and embodiment 3, more according to the cycle-index of the lithium ion battery of the embodiment of the present invention, cycle performance is improved.Thus, can reach a conclusion: lithium ion battery according to the present invention is due to the coating process that has changed lithium ion cell electrode, electrode assembling after changing is become battery, can shorten the soak time of battery and the cycle performance of raising battery, the raising of cycle performance can extend the useful life of new-energy automobile.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (11)
1. a lithium ion battery, is characterized in that, comprises battery case, is provided with in described battery case:
Plus plate current-collecting body is coated with positive electrode active material and leaves exposed region on described plus plate current-collecting body;
Negative current collector is coated with negative electrode active material on described negative current collector;
Barrier film, described barrier film between described plus plate current-collecting body and described negative current collector to play a compartmentation; With
Electrolyte, described electrolyte are filled between described plus plate current-collecting body, negative current collector, barrier film and described battery case,
Wherein, described plus plate current-collecting body, negative current collector and barrier film are wound into predetermined shape.
2. lithium ion battery according to claim 1, is characterized in that, described plus plate current-collecting body is rectangular, and described exposed region becomes ribbon to connect any two opposite side of described plus plate current-collecting body.
3. lithium ion battery according to claim 1, is characterized in that, described exposed area field width 1-3mm.
4. lithium ion battery according to claim 1, is characterized in that, described exposed region is provided with 1-3.
5. lithium ion battery according to claim 1, is characterized in that, described plus plate current-collecting body material is aluminium foil.
6. lithium ion battery according to claim 1, is characterized in that, described positive electrode active material material is transition metal oxide.
7. lithium ion battery according to claim 6, is characterized in that, described transition metal oxide comprises LiCoO
2Or LiNi
1/3Co
1/3Mn
1/3O
2Or the transition metal oxide of both mixing.
8. lithium ion battery according to claim 1, is characterized in that, described negative current collector is Copper Foil.
9. lithium ion battery according to claim 8, is characterized in that, described negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
10. the method for preparing lithium ion battery according to claim 1, is characterized in that, described diaphragm material is at least a in polyethylene or polypropylene.
11. the method for preparing lithium ion battery according to claim 1 is characterized in that, described electrolyte is one or more of DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104024656A CN103151555A (en) | 2011-12-06 | 2011-12-06 | Lithium ion battery |
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|---|---|---|---|
| CN2011104024656A CN103151555A (en) | 2011-12-06 | 2011-12-06 | Lithium ion battery |
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| CN2011104024656A Pending CN103151555A (en) | 2011-12-06 | 2011-12-06 | Lithium ion battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713417A (en) * | 2004-06-25 | 2005-12-28 | 三星Sdi株式会社 | Electrode and rechargeable battery therewith |
| CN2872606Y (en) * | 2005-12-01 | 2007-02-21 | 深圳市比克电池有限公司 | Coiling lithium-ion battery unit and lithium-ion battery thereof |
| CN102037584A (en) * | 2008-05-22 | 2011-04-27 | 松下电器产业株式会社 | Electrode group for secondary battery and secondary battery using the same |
| US20110151295A1 (en) * | 2009-12-17 | 2011-06-23 | Kwang-Chun Kim | Electrode assembly and secondary battery using the same |
| CN202616355U (en) * | 2011-12-06 | 2012-12-19 | 北汽福田汽车股份有限公司 | Lithium ion battery |
-
2011
- 2011-12-06 CN CN2011104024656A patent/CN103151555A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713417A (en) * | 2004-06-25 | 2005-12-28 | 三星Sdi株式会社 | Electrode and rechargeable battery therewith |
| CN2872606Y (en) * | 2005-12-01 | 2007-02-21 | 深圳市比克电池有限公司 | Coiling lithium-ion battery unit and lithium-ion battery thereof |
| CN102037584A (en) * | 2008-05-22 | 2011-04-27 | 松下电器产业株式会社 | Electrode group for secondary battery and secondary battery using the same |
| US20110151295A1 (en) * | 2009-12-17 | 2011-06-23 | Kwang-Chun Kim | Electrode assembly and secondary battery using the same |
| CN202616355U (en) * | 2011-12-06 | 2012-12-19 | 北汽福田汽车股份有限公司 | Lithium ion battery |
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Application publication date: 20130612 |