CN110224125A - A kind of porous carbon-nanometer silico-carbo Core-shell structure material and preparation method thereof - Google Patents
A kind of porous carbon-nanometer silico-carbo Core-shell structure material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of porous carbon-nanometer silico-carbo Core-shell structure material and preparation method thereof, using porous carbon materials as substrate, intermediate embeding layer is made of the Core-shell structure material nano-silicon, external sheath amorphous carbon carbon shell.Preparation method includes: first to etch the substrate carbon material Jing Guo pre-etching through medium temperature in atmosphere of inert gases, then high-temperature activation, and post-processing obtains porous carbon materials；Porous carbon materials are mixed and ground in a solvent with nano-silicon, composite material is obtained；Composite material is mixed in a solvent with carbon source and carried out mist projection granulating, is then heat-treated in an inert gas atmosphere.The present invention effectively increases the coulombic efficiency for the first time and material structure stability of material.After mixing with graphite material, reversible capacity can be obtained in the high stability silicon-carbon composite cathode active material of 400~650mAh/g.In addition, composite material lower production costs of the present invention, are suitble to industrialized production.
Description
Technical field
The invention belongs to electrochemical fields, are related to the porous carbon-nano-silicon-carbon composite and its system of a kind of lithium battery
Preparation Method.
Background technique
In recent years, in face of increasingly serious environmental pollution and energy shortage problem.New-energy automobile becomes current development
Hot spot, and using electric car as development priority among this.And it is close with the development of lithium ion battery as the key of electric energy
It is related.Compared to traditional fossil energy, lithium ion battery is more for average output voltage is high, self discharge is low, memory-less effect
And the advantages that long service life.But at present the lower problem of lithium ion battery energy density seriously constrain electric car into one
Walk the enlargement of application.
Silicon based anode material holds up to the theoretical specific capacity of 3759mAh/g, is that current commercial graphite cathode material is theoretical
Nearly 9 times of specific capacity, therefore, silicon based anode material have good with prospect.However, using silicon based anode material lithium from
Sub- battery is also faced with some problems: in charge and discharge process, significant volume change can occur for silicon, to cause active material
Mechanical crushing and failure, separate electrode material with collector, seriously affect the cycle performance of battery, in addition, silicon there is also
The poor problem of electric conductivity.At present widely studies have shown that reasonable pore structure can effectively alleviate the body of silicon based anode material
Product expansion, good conductive network guarantee the electric conductivity of material.Therefore, there is the silicon carbon material of good skeleton structure to be for design
One big hot spot of silica-base material research and development.
In the prior art, patent CN108767195A discloses a kind of preparation method of pore structure silicon based electrode material,
By the way that the pore creating materials such as ammonium carbonate, ammonium hydrogen carbonate, ammonium acetate, ammonium nitrate, ammonium chloride are added when early period, silicon was mixed with organic carbon source,
Then heating decomposes pore creating material, and material is made to form hole, but this method will cause that material internal is loose porous to keep structure steady
There is hole in qualitative variation, carbon shell surface, are unfavorable for forming stable SEI film.Patent CN109378461A discloses a kind of hole
The preparation method of gap structure silicon-carbon cathode material, this method are needed P123, ZrOCl2·8H2O is added to H3PO4In solution, and
Porous material is obtained by complicated technologies such as crystallization, filtering, washing, drying, roasting, coolings, then mixes and is sintered with Mg powder,
It is then cleaned with hydrochloric acid, and filtration drying, is then mixed with sucrose, and high-temperature calcination etc., finally obtain a kind of meso-hole structure
Silicon-carbon cathode material.This method complex process higher cost, and have multiple water washing operations, water and nano-silicon after magnesiothermic reduction
Reaction, which will produce hydrogen, to bring severe compromise to industrialized production.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the shortcomings of to mention in background above technology and defect, provide one
Kind of lithium battery porous carbon-nanometer silico-carbo Core-shell structure material and preparation method thereof, stability is poor to solve, complex process
Problem.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of preparation method of porous carbon-nanometer silico-carbo Core-shell structure material, includes the steps that following:
S1, by the substrate carbon material Jing Guo pre-etching, in atmosphere of inert gases, first etched through 200~300 DEG C of medium temperatures,
Then 700~900 DEG C of high-temperature activations, post-processing obtain porous carbon materials, and the activator that the pre-etching uses is alkali；
S2, the porous carbon materials that S1 is obtained are mixed and is ground in a solvent with nano-silicon, nano-silicon is made to be embedded in porous carbon
Material obtains composite material；
S3, the composite material that S2 is obtained is mixed in a solvent with carbon source and carries out mist projection granulating, then in inert gas
It is heat-treated in atmosphere, temperature is 700~1000 DEG C, coats composite material surface by agraphitic carbon, obtains porous carbon-and receive
Rice silico-carbo Core-shell structure material.
Further, further includes:
S4, porous carbon-nanometer silico-carbo Core-shell structure material that S3 is obtained and graphite type material ball milling mixing are uniform, obtain
To silicon-carbon cathode active material.
Further, first by substrate carbon material and activator example 1:4~1:8 in mass ratio in S1, mixing is equal in a solvent
Even, drying obtains mixture, and the mixture is carried out medium temperature etching.
Further, medium temperature etches 0.5~3h, 2~6h of high-temperature activation in S1.
Further, nano-silicon and porous carbon materials mass ratio 1:4~1:10 in S2.
Further, composite material and carbon source mass ratio 10:1~10:7 in S3, heat treatment time are 2~10h.
Further, in S1 substrate carbon material raw material be natural graphite, it is artificial graphite, carbonaceous mesophase spherules, soft carbon, hard
One or both of carbon, bitumencarb and coal tar oil carbon or a variety of mixing.
Further, carbon source is selected from least one of following material in S3: citric acid, sucrose, polyvinylpyrrolidine
Ketone, starch, dextrin, polyaniline, pitch, phenolic resin, epoxy resin, polyimides, polyvinyl butyral, polyethylene glycol are hard
Resin acid ester, polyvinyl alcohol or heavy oil.
The porous carbon that the method is prepared-nanometer silico-carbo Core-shell structure material, the Core-shell structure material is with porous carbon
Material is substrate, and intermediate embeding layer is made of nano-silicon, external sheath amorphous carbon carbon shell.
Further, further include and the mixed uniformly graphite-like material of the porous carbon-nanometer silico-carbo Core-shell structure material
Material, on the basis of material gross mass, the weight percent of each substance are as follows: porous carbon materials 12~40%, nano-silicon 3~10%,
Amorphous carbon carbon shell 3~8%, graphite type material 40~70% add up to 100%.
Compared with prior art, the invention has the benefit that
In the present invention, the aperture for etching carbon material can be controlled according to experimental condition in 2~2000nm, can effectively be extenuated
The volume expansion of silicon particle.Relatively compact agraphitic carbon shell advantageously forms stable SEI film, so that it is negative to effectively improve silicon substrate
The overall performance of pole material.Amorphous carbon coating layer and porous carbon materials form three-dimensional conductive network, can improve materials conductive
Performance forms carbon backbone structure with porous carbon materials, the overall stability of material structure can be improved.
Since there are 300% volume changes in charge and discharge process for silicon, huge stress, this hair are generated to material
The porous structure of bright structure can provide expansion space, and amorphous carbon shell and porous carbon materials constitute skeleton, can be in certain journey
The effect for alleviating stress on degree is conducive to material and keeps stablizing in cyclic process.Amorphous carbon shell can effectively obstruct silicon with
The direct contact of electrolyte reduces the generation of side reaction, reduces the production quantity of SEI film, to improve coulombic efficiency for the first time.
Compared with the prior art, the present invention is designed by core-shell type three-layer composite structure, so that the porous carbon-nano-silicon-
Carbon composite effectively increases the coulombic efficiency for the first time and material structure stability of material.After being mixed with graphite material, it can obtain
To reversible capacity 400~650mAh/g high stability silicon-carbon composite cathode active material.In addition, composite material of the present invention is raw
Cost is relatively low for production, is suitble to industrialized production.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is composite structure schematic diagram of the present invention；
Fig. 2 is porous carbon-nanometer silico-carbo Core-shell structure material electron microscopic picture in the embodiment of the present invention 2.
Specific embodiment
To facilitate the understanding of the present invention, the present invention is done below in conjunction with Figure of description and preferred embodiment more complete
Face meticulously describes, but protection scope of the present invention is not limited to following specific embodiments.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art
Together.Technical term used herein is intended merely to the purpose of description specific embodiment, and it is of the invention to be not intended to limitation
Protection scope.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city
Field is commercially available or can be prepared by existing method.
Porous carbon of the invention-nanometer silico-carbo sandwich is core-shell type three-layer composite structure, such as Fig. 1, substrate 1
For porous carbon materials, middle layer 2 is the nano-silicon being embedded in porous carbon, and outermost layer 3 is the nothing formed after carbon compound is carbonized
Shape carbon coating layer.
In one preferred embodiment, preparation method of the invention includes the following steps:
(1) material etch: substrate carbon material and activator example 1:4~1:8 in mass ratio are filled in a solvent at normal temperature
Divide and is uniformly mixed, 60~90 DEG C of dryings 8~vacuum filtration obtains mixture afterwards for 24 hours.The step is mainly pre- corruption of the alkali to graphite
Erosion, this stage will form defect in carbon material surface.For activating mechanism, the high temperature etching of alkali is carried out in fault location
, the carbon material for lacking defect and micropore is difficult to etch hole, the direct main hair of high temperature etching of such as flawless graphite material
Raw peeling, and rare obvious hole generates.
Mixture is warming up to 200~300 DEG C of medium temperatures under atmosphere of inert gases and etches 0.5~3h, then raises temperature to 700
~900 DEG C of 2~6h of high-temperature activation.Product is washed to neutral and filtration drying and obtains porous carbon materials.For alkaline etching mechanism,
Medium temperature etching belongs to the pre-etching stage, etches in fault location and generates micropore, and no matter hole depth or aperture do not comply with and want the hole
It asks, but is the essential step further etched.Mainly further occurrence expands high temperature etch stages on the basis of micropore
Hole reaction forms bigger deeper hole.The generation of hole and size are related with the reaction condition in each stage.
(2) silicon-carbon is compound: nano-silicon is mixed under organic solvent with porous carbon materials example 1:4~1:10 in mass ratio,
2~4h is sanded with 200~800r/min ball milling 2~8h or 1000~2000r/min, vacuum drying or oil bath are dry, are answered
Condensation material.
(3) carbonization molding: step (2) products therefrom and carbon source are mixed under organic solvent with mass ratio 10:1~10:7
It closes, carries out mist projection granulating, inlet temperature is 170~300 DEG C, and outlet temperature is 80~150 DEG C.Spray drying products therefrom is placed in
It is heat-treated in the tube furnace of inert gas atmosphere, temperature is 700~1000 DEG C, and the time is 3~10h, obtains porous carbon-
Nano-silicon-carbon composite.Heat treatment temperature is too low to be insufficient to allow carbon source to be carbonized, and temperature is too high to will lead to nano-silicon and carbon materials
Material, which reacts, generates silicon carbide.
If porous carbon of the invention-nanometer silico-carbo sandwich is prepared into silicon-carbon cathode active material, further include
Following step: (4) mixing: by porous carbon-nano-silicon-carbon composite and graphite type material according to certain mass than carrying out
Ball milling mixing, obtains the high stability silicon-carbon cathode active material of 400~650mAh/g.
In step (1) substrate carbon material raw material be natural graphite, artificial graphite, carbonaceous mesophase spherules, soft carbon, hard carbon,
One or both of bitumencarb and coal tar oil carbon or a variety of mixing.
It is deionized water, in ethyl alcohol, N-Methyl pyrrolidone, acetone, ethylene glycol, glycerine in the solvent in step (1)
At least one.
Activator in step (1) is lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), hydrogen-oxygen
Change rubidium (RbOH), cesium hydroxide (CsOH), ammonium hydroxide (NH4OH), calcium hydroxide (Ca (OH)2), barium hydroxide (Ba (OH)2)
With magnesium hydroxide (Mg (OH)2At least one of).
Organic solvent in step (2) and (3) is alcohols solvent, N-Methyl pyrrolidone, tetrahydrofuran, toluene, two
One or more of methyl sulfoxide, wherein alcohols solvent is ethyl alcohol, in methanol, propyl alcohol, ethylene glycol, glycerine, isopropanol
It is one or more of.
The agraphitic carbon shell carbon source described in step (3) be selected from least one of following material: citric acid, sucrose,
Polyvinylpyrrolidone, starch, dextrin, polyaniline, pitch, phenolic resin, epoxy resin, polyimides, polyvinyl alcohol contracting fourth
Aldehyde, polyethylene glycol stearate, polyvinyl alcohol, heavy oil.
It is described in detail below by way of specific embodiment and comparative example.
Embodiment 1
Take 24.00g graphite (reversible capacity 330mAhg-1), 78.4gKOH is added in 300.00g deionized water, room temperature
Magnetic agitation 30min, then 80 DEG C of vacuum drying 8h, are then filtered by vacuum, mixture after filtering are placed in tube furnace, in nitrogen
Under gas shielded, 200 DEG C of activation 1h then raise temperature to 900 DEG C of activation 2h, and product is washed to neutral and filtration drying and obtains porous carbon
Material.Porous carbon materials 12.00g, nano-silicon 1.5g are taken, 8.5g ethyl alcohol is added and is starched with the revolving speed ball milling 2h of 200r/min
3h is dried in material oil bath at 85 DEG C, and obtained 3 SiC 2/graphite sample is ground.Take 5% polyethylene of 8.00g 3 SiC 2/graphite 24.00g
Pyrrolidones ethanol solution is uniformly mixed, mist projection granulating.Then mixture is placed in tube furnace, lead to argon gas protection, with 3 DEG C/
Min is warming up to 900 DEG C of soaking time 2h, and cooled to room temperature obtains composite material.Take 7.763g composite material and
5.8875g graphite (reversible capacity 330mAhg-1) be uniformly mixed, obtain silicon based composite material.The embodiment porous carbon main aperture
Hole diameter observes gained at 1~2 μm, by SEM.
Embodiment 2
Take 24.00g artificial graphite (reversible capacity 330mAhg-1), 300.00g deionized water is added in 168.00gKOH
In, room temperature magnetic agitation 30min, then 80 DEG C of forced air drying 16h, are then filtered by vacuum, and mixture after filtering is placed in tubular type
In furnace, under nitrogen protection, 250 DEG C of activation 1h, 800 DEG C of activation 2h, product be washed to neutral and filtering vacuum be dried to obtain it is more
Hole carbon material.Porous carbon materials 36.00g, nano-silicon 4.5g are taken, 25.5g isopropanol is added, with the revolving speed ball milling of 200r/min
3h obtains slurry oil bath at 85 DEG C and dries 1h, obtained 3 SiC 2/graphite sample is ground.Take 8.00g 3 SiC 2/graphite and 4.70g
Tar heavy oil is uniformly mixed, and mixture is placed in tube furnace, is led to nitrogen protection, is warming up to 900 DEG C of soaking times with 3 DEG C/min
4h, cooled to room temperature obtain composite material, electron microscopic picture such as Fig. 2, and nano-silicon is filled in the hole of porous graphite,
The carbon shell that tar heavy oil pyrolysis generates is coated on porous graphite nano silicon complex, and it is interior for foring a kind of porous graphite
Core, nano-silicon are filler, and pyrolytic carbon shell is the combined type Core-shell structure material of outer layer.Take 5.40g composite material and 3.70g graphite
(reversible capacity 358mAhg-1) be uniformly mixed, obtain silicon based composite material.The main hole of embodiment porous carbon is at 1~2 μm
(SEM observation gained), porous carbon materials BET specific surface area 1.964m2·g-1, D50=17.09 μm of composite material granularity.
Embodiment 3
24.00g bitumencarb is taken, 120.00gKOH is added in 500.00g deionized water, room temperature magnetic agitation 30min, so
90 DEG C of vacuum drying 4h afterwards, are then filtered by vacuum, mixture after filtering are placed in tube furnace, is vacuumized, 200 DEG C of activation 2h,
700 DEG C of activation 4h, product are washed to neutral and filtering vacuum and are dried to obtain porous carbon materials.Porous carbon materials 12.00g is taken, is received
Rice silicon 1.5g, is added 8.5g dimethyl sulfoxide, and with the revolving speed ball milling 5h of 300r/min, it is dry to obtain slurry oil bath at 85 DEG C
2h grinds obtained silicon porous carbon sample.Take 8.00g silicon porous carbon and 5% polyvinyl butyral acetone of 32.00g
Solution is uniformly mixed, and mixture is placed in tube furnace by spray drying, is led to nitrogen protection, is warming up to 900 DEG C of guarantors with 5 DEG C/min
Warm time 4h, cooled to room temperature obtain composite material.Take 6.73g composite material and 2.37g graphite (reversible capacity
330mAh·g-1) be uniformly mixed, obtain silicon based composite material.
Embodiment 4
24.00g natural graphite is taken, 110.00gKOH is added in 500.00g deionized water, room temperature magnetic agitation 30min,
Then 90 DEG C of vacuum drying 4h, are then filtered by vacuum, mixture after filtering are placed in tube furnace, is vacuumized, 300 DEG C of activation
1h, 800 DEG C of activation 1h, product are washed to neutral and filtering vacuum and are dried to obtain porous carbon materials.Porous carbon materials 24.00g is taken,
17.0g N-Methyl pyrrolidone is added in nano-silicon 3.0g, and with the revolving speed ball milling 3h of 500r/min, it is oily at 85 DEG C to obtain slurry
Dry 2h is bathed, obtained silicon porous carbon sample is ground.Take 8.00g silicon porous carbon and 5% polyvinyl alcohol contracting fourth of 32.00g
Aldehyde acetone soln is uniformly mixed, and mixture is placed in tube furnace by spray drying, is led to argon gas protection, is warming up to 5 DEG C/min
900 DEG C of soaking time 4h, cooled to room temperature obtain composite material.5.175g composite material and 3.925g graphite is taken to mix
Uniformly, silicon based composite material is obtained.The aperture of the porous natural graphite is in 100nm or so, and there are a certain number of 1~2 μm
Macropore (observes gained by SEM).
Comparative example 1
By 12.00g graphite (reversible capacity 330mAhg-1), 8.5 second are added in 1.50g nano-silicon (D50=120nm)
Alcohol is obtained slurry oil bath at 85 DEG C and is dried 1h, the 3 SiC 2/graphite sample grounds travel that will be obtained with the revolving speed ball milling 2h of 200r/min
It is broken.Take 8.00g 3 SiC 2/graphite and 1.20g asphalt powder to be uniformly mixed, mixture is placed in tube furnace, lead to nitrogen protection, with 3 DEG C/
Min is warming up to 900 DEG C of soaking time 2h, and cooled to room temperature obtains composite material.Take 5.175g composite material and 3.925g
Artificial graphite (reversible capacity 330mAhg-1) be uniformly mixed, obtain silicon based composite material.
Comparative example 2
By 12.00g graphite (reversible capacity 330mAhg-1), 8.5 isopropanols are added, with the revolving speed ball milling of 200r/min
2h obtains slurry oil bath at 85 DEG C and dries 1h, obtained graphite sample is ground.Take 8.00g graphite and 1.20g pitch
Powder is uniformly mixed, and mixture is placed in tube furnace by mist projection granulating, is led to nitrogen protection, is warming up to 900 DEG C of guarantors with 3 DEG C/min
Warm time 2h, cooled to room temperature obtain composite material.Take 5.175g composite material and 3.925g graphite (reversible capacity
330mAh·g-1) be uniformly mixed, obtain silicon based composite material.D50=15.1 μm of the material particle size of the comparative example, BET specific surface
Product=1.125m2·g-1。
Test method: the material for taking comparative example 1~2 and Examples 1 to 4 to prepare is as negative electrode material, with binder
LA133, conductive agent (Super-P) are mixed according to the mass ratio of 91:6:3, and suitable deionized water is added and is slurred as solvent
Material is coated on copper foil, and vacuum dried, roll-in, is prepared into negative electrode tab；It is used as using metal lithium sheet to electrode, is used
The LiPF of 1mol/L6Three component mixed solvents press the electrolyte of EC:DMC:EMC=1:1:1 (v/v) mixing, micro- using polypropylene
Pore membrane is diaphragm, is assembled into CR2032 type button cell in being full of inert atmosphere glove box.The charge-discharge test of button cell
On Wuhan Land Electronic Co., Ltd.'s LANHE battery test system, in normal temperature condition, 0.1C constant current charge-discharge fills
Discharge voltage is limited in 0.001~1.5V.
Partial test result is as shown in the table.
Nano-silicon usually will lead to if fruit structure collapses come its stability of indirect proof by material circulation performance
It is directly exposed in electrolyte, so as to cause side reaction aggravation, material capacity fails rapidly.In addition the coulombic efficiency for the first time of material
It can also be used as certain judgment basis, coulombic efficiency is relatively low it is considered that material cladding is imperfect for the first time, and stability is naturally also
It can deviation.By above-mentioned experimental data it can be shown that the present invention has obtained the silicon-carbon composite cathode active material of high stability.
Above-mentioned only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form.Therefore, it is all not
Be detached from technical solution of the present invention content, according to the present invention technical spirit it is made to the above embodiment it is any it is simple modification, etc.
With variation and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (10)
1. a kind of porous carbon-nanometer silico-carbo Core-shell structure material preparation method, which is characterized in that include the steps that following:
S1, by the substrate carbon material Jing Guo pre-etching, in atmosphere of inert gases, first etched through 200~300 DEG C of medium temperatures, then
700~900 DEG C of high-temperature activations, post-processing obtain porous carbon materials, and the activator that the pre-etching uses is alkali；
S2, the porous carbon materials that S1 is obtained are mixed and are ground in a solvent with nano-silicon, nano-silicon is made to be embedded in porous carbon materials,
Obtain composite material；
S3, the composite material that S2 is obtained is mixed in a solvent with carbon source and carries out mist projection granulating, then in inert gas atmosphere
In be heat-treated, temperature be 700~1000 DEG C, coat composite material surface by agraphitic carbon, obtain porous carbon-nanometer
Silico-carbo Core-shell structure material.
2. porous carbon according to claim 1-nanometer silico-carbo Core-shell structure material preparation method, which is characterized in that also
Include:
S4, porous carbon-nanometer silico-carbo Core-shell structure material that S3 is obtained and graphite type material ball milling mixing are uniform, obtain silicon
Carbon anode active material.
3. porous carbon according to claim 1 or 2-nanometer silico-carbo Core-shell structure material preparation method, feature exist
In, the pre-etching in S1 includes: to be uniformly mixed substrate carbon material and activator example 1:4~1:8 in mass ratio in a solvent,
Drying obtains mixture, and the mixture is used for medium temperature etching.
4. porous carbon according to claim 1 or 2-nanometer silico-carbo Core-shell structure material preparation method, feature exist
In medium temperature etches 0.5~3h, 2~6h of high-temperature activation in S1.
5. porous carbon according to claim 1 or 2-nanometer silico-carbo Core-shell structure material preparation method, feature exist
In nano-silicon and porous carbon materials mass ratio 1:4~1:10 in S2.
6. porous carbon according to claim 1 or 2-nanometer silico-carbo Core-shell structure material preparation method, feature exist
In composite material and carbon source mass ratio 10:1~10:7 in S3, heat treatment time are 2~10h.
7. porous carbon according to claim 1 or 2-nanometer silico-carbo Core-shell structure material preparation method, feature exist
In substrate carbon material raw material is natural graphite, artificial graphite, carbonaceous mesophase spherules, soft carbon, hard carbon, bitumencarb and coal tar in S1
One or both of oil carbon or a variety of mixing.
8. porous carbon according to claim 1 or 2-nanometer silico-carbo Core-shell structure material preparation method, feature exist
In carbon source is selected from least one of following material in S3: citric acid, polyvinylpyrrolidone, starch, dextrin, gathers sucrose
Aniline, pitch, phenolic resin, epoxy resin, polyimides, polyvinyl butyral, polyethylene glycol stearate, polyvinyl alcohol
Or heavy oil.
9. a kind of porous carbon being prepared using one of claim 1~8 the method-nanometer silico-carbo Core-shell structure material,
It is characterized in that, the Core-shell structure material, using porous carbon materials as substrate, intermediate embeding layer is made of nano-silicon, external sheath without
Shape carbon carbon shell.
10. porous carbon according to claim 9-nanometer silico-carbo Core-shell structure material, which is characterized in that further include and institute
State porous carbon-mixed uniformly graphite type material of nanometer silico-carbo Core-shell structure material, on the basis of material gross mass, each substance
Weight percent are as follows: porous carbon materials 12~40%, nano-silicon 3~10%, amorphous carbon carbon shell 3~8%, graphite type material
40~70%, add up to 100%.
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