CN107069007A - A kind of silicon-carbon cathode material and preparation method thereof - Google Patents
A kind of silicon-carbon cathode material and preparation method thereof Download PDFInfo
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- CN107069007A CN107069007A CN201710270850.7A CN201710270850A CN107069007A CN 107069007 A CN107069007 A CN 107069007A CN 201710270850 A CN201710270850 A CN 201710270850A CN 107069007 A CN107069007 A CN 107069007A
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to energy storage research field, more particularly to a kind of silicon-carbon cathode material, including nuclear structure and shell structure, the nuclear structure include primary particle structure and conductive component, and the primary particle is closely joined together with conductive agent component；Microcellular structure is uniform-distribution with the nuclear structure, the micropore pore volume accounts for the 1%~80% of whole nuclear structure volume.Enough spaces now are reserved in the silicon-carbon cathode material nuclear structure, for the volumetric expansion of silicon grain during subsequent charge, therefore the integrally-built stability of silicon-carbon cathode material is good, can show more superior chemical property.
Description
Technical field
The invention belongs to energy storage material technical field, more particularly to a kind of silicon-carbon cathode material and preparation method thereof.
Background technology
Lithium ion battery is so that its specific energy is big, operating voltage is high, self-discharge rate is small, small volume, the advantage such as lightweight, from it
Since birth, revolutionary change just has been brought to energy storage field, is widely used in various portable electric appts and electronic
In automobile.However as the improvement of people's living standards, higher Consumer's Experience proposes higher requirement to lithium ion battery：
Quality is lighter, use time is longer etc.；The more excellent electrode material of new performance is had to look for solve the above problems.
Current commercialized lithium ion battery negative material is mainly graphite, but because its theoretical capacity is only 372mAhg-1, the active demand of user can not be met；Therefore, the exploitation of the negative material of more height ratio capacity is extremely urgent.It is used as lithium ion
Cell negative electrode material, silicon materials receive much concern always.Its theoretical capacity is 4200mAhg-1, it is the graphite capacity having been commercialized
More than 10 times.And it is relatively inexpensive, environment-friendly etc. excellent with low intercalation potential, low atomic wts, high-energy-density, price
One of gesture, therefore be the optimal selection of high-capacity cathode material of new generation.
But be due to that silicon materials electric conductivity itself is poor and in charge and discharge process volumetric expansion it is big and easily cause material knot
Structure is destroyed and mechanical crushing, causes the decay of its cycle performance fast, is limited it and is widely applied.In order to solve the above problems,
Prior art mainly has silicon grain nanosizing, conductive material with excellent conductive capability etc. is added into silica-base material particle
Deng the electric conductivity for improving silica-base material integral particle, while solving the mechanical powder of silica-base material in material charge and discharge process
Broken the problems such as.
Even if but to silica-base material progress nanosizing processing, its particle still can occur huge in charge and discharge process in itself
Big volumetric expansion, so that secondary silicon grain Stability Analysis of Structures is deteriorated as made from nano particle, ultimately results in silicon-carbon cathode
The chemical property of material is affected.
In view of this, it is necessory to propose a kind of silicon-carbon cathode material and preparation method thereof, it can thoroughly solve silicon-carbon
Influence of the volumetric expansion to silicon-carbon second particle structural stability in negative material charging process, so as to prepare function admirable
Silicon-carbon cathode material.
The content of the invention
It is an object of the invention to：In view of the shortcomings of the prior art, a kind of silicon-carbon cathode material provided, including core knot
Structure and shell structure, the nuclear structure include primary particle structure and conductive component, and the primary particle and conductive agent component are tight
It is close to link together；Microcellular structure is uniform-distribution with the nuclear structure, the micropore pore volume accounts for whole nuclear structure volume
1%~80%.Enough spaces now are reserved in the silicon-carbon cathode material nuclear structure, for silicon grain during subsequent charge
Volumetric expansion, therefore the integrally-built stability of silicon-carbon cathode material is good, can show more superior chemical property.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of silicon-carbon cathode material, including nuclear structure and shell structure, the nuclear structure include primary particle structure and led
Electric component, the primary particle is closely joined together with conductive agent component；Microcellular structure is uniform-distribution with the nuclear structure,
The micropore pore volume accounts for the 1%~80% of whole nuclear structure volume；The porosity of maximum reserved 80%, because even non-hole
The all silica-base materials in part, headspace also its volumetric expansion enough.
As silicon-carbon cathode material of the present invention one kind improve, the primary particle include silica-base material primary particle and/
Or non-silicon sill primary particle；The conductive agent and component are the conductive agent that conventional conductive agent or/and organic carbon are obtained；
The primary particle is dispersed in the conductive network structure that the conductive agent is constituted；The μ of the nuclear structure particle diameter D1 >=1
M, silicon substrate primary particle diameter D2≤5 μm.
As silicon-carbon cathode material of the present invention one kind improve, the silica-base material primary particle include elemental silicon or/and
Si oxide；The non-silicon sill primary particle include native graphite, Delanium, carbonaceous mesophase spherules, soft carbon, hard carbon,
Petroleum coke, carbon fiber, thermal decomposed resins carbon, lithium titanate, tin base cathode material, transition metal nitride, kamash alloy, germanium base are closed
At least one of gold, acieral, antimony-containing alloy, magnesium base alloy；The conventional conductive agent includes conductive black, super conduction
Carbon, Ketjen black, CNT, graphene, at least one of acetylene black race；The organic matter is that to include organic carbon source (described to have
Machine carbon source includes glucose, sucrose, soluble starch, cyclodextrin, furfural, sucrose, glucose, cornstarch, tapioca, small
It is wheat starch, cellulose, polyvinyl alcohol, polyethylene glycol, Tissuemat E, phenolic resin, vinyl pyrrolidone, epoxy resin, poly-
In vinyl chloride, glycan alcohol, furane resins, Lauxite, polymethyl methacrylate, Kynoar or polyacrylonitrile at least
It is a kind of) or/and high molecular polymer (high molecular polymer, which includes high molecular polymer, includes polymethyl methacrylate
(PMMA), in Kynoar (PVDF), butadiene-styrene rubber (SBR), sodium carboxymethylcellulose (CMC), polypropylene fine (PAN) extremely
Few a kind of, described carbon source component includes glucose, sucrose, soluble starch, cyclodextrin, furfural, sucrose, glucose, corn and formed sediment
Powder, tapioca, wheaten starch, cellulose, polyvinyl alcohol, polyethylene glycol, Tissuemat E, phenolic resin, ethenyl pyrrolidone
Ketone, epoxy resin, polyvinyl chloride, glycan alcohol, furane resins, Lauxite, polymethyl methacrylate, Kynoar or poly-
At least one of acrylonitrile, petroleum coke, oil system needle coke, coal-based needle coke).
Improved as one kind of silicon-carbon cathode material of the present invention, the high molecular polymer can be in situ for high polymer monomer
It polymerize and obtains；The high polymer monomer includes esters of acrylic acid, methyl acrylic ester, styrene, acrylonitrile, metering system
Nitrile, polyethylene glycol dimethacrylate, polyethyleneglycol diacrylate, divinylbenzene, trimethylol propane trimethyl third
Olefin(e) acid ester, methyl methacrylate, N, N- DMAAs, N- acryloyl morpholines, methyl acrylate, ethyl acrylate,
Butyl acrylate, positive Hexyl 2-propenoate, 2- cyclohexyl acrylates, dodecyl acrylate, GDMA, poly- second
Diol dimethacrylate, polyethylene glycol dimethacrylate, neopentylglycol diacrylate, the propylene of 1,6-HD two
Acid esters, tetraethylene glycol diacrylate, tri (propylene glycol) diacrylate, ethoxyquin tetramethylol methane tetraacrylate, the third oxidation
Pentaerythritol acrylate, double-Glycerin tetraacrylate, pentaerythritol triacrylate, trimethylolpropane tris first
Base acrylate, glycerol propoxylate triacrylate, three (2- ethoxys) isocyanuric acid triacrylate trimethylolpropane tris
Acrylate, propoxylation trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, ethyoxyl
Change in trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, tetramethylol methane tetraacrylate
At least one.
Present invention additionally comprises a kind of preparation method of silicon-carbon cathode material, mainly comprise the following steps：
Step 1, primary particle, conventional conductive agent component or/and conductive agent component presoma, pore creating material, solvent are mixed
Uniformly, precursor solution is obtained, conductive agent plays electric action, depending on its ratio is according to material and conductive demand, pore creating material consumption
Depending on pore-creating amount, porosity is big, and corresponding pore creating material demand is more, and interval is 1%~80%；
Step 2, precursor solution pelletizing step 1 obtained, obtains nuclear structure presoma；
Step 3, pore creating material is removed, is coated afterwards, being carbonized obtains silicon-carbon cathode material；
Or
Step 3 ', coated, be carbonized afterwards, during remove pore creating material be to obtain silicon-carbon cathode material.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, pore creating material sheet is as solid group described in step 1
Point, it can distil, resolve into gas component.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, pore creating material described in step 1 is benzoic acid, grass
Acid, how at least one of ball, ammonium hydrogen carbonate, ammonium carbonate, ammonium chloride, ammonium nitrate, can also be produced for decomposable asymmetric choice net after other heating
The ammonium salt of angry body and other materials.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, the primary particle includes silica-base material once
Particle and/or non-silicon sill primary particle；The conventional conductive agent includes conductive black, super conductive carbon, Ketjen black, carbon and received
Mitron, graphene, at least one of acetylene black race；The conductive agent component presoma include organic carbon source, high molecular polymer,
At least one of polymer monomer.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, the polymer monomer includes acrylate
Class, methyl acrylic ester, styrene, acrylonitrile, methacrylonitrile, polyethylene glycol dimethacrylate, polyethylene glycol two
Acrylate, divinylbenzene, trimethylol-propane trimethacrylate, methyl methacrylate, N, N- dimethyl allenes
Acid amides, N- acryloyl morpholines, methyl acrylate, ethyl acrylate, butyl acrylate, positive Hexyl 2-propenoate, 2- acrylates
Ester, dodecyl acrylate, GDMA, polyethylene glycol dimethacrylate, polyethylene glycol dimethyl propylene
Olefin(e) acid ester, neopentylglycol diacrylate, 1,6 hexanediol diacrylate, tetraethylene glycol diacrylate, tripropylene glycol
Diacrylate, ethoxyquin tetramethylol methane tetraacrylate, the third oxidation pentaerythritol acrylate, double-Glycerin 4 third
Olefin(e) acid ester, pentaerythritol triacrylate, trimethylol-propane trimethacrylate, glycerol propoxylate triacrylate, three
(2- ethoxys) isocyanuric acid triacrylate trimethylolpropane trimethacrylate, propoxylation trimethylolpropane tris propylene
Acid esters, ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylation three
At least one of hydroxymethyl-propane triacrylate, tetramethylol methane tetraacrylate.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, when in conductive component presoma described in step 1
During including polymer monomer, after step 2 pelletizing, nuclear structure presoma is obtained, initiator is placed in afterwards, and (initiator is different
Cumene hydroperoxide, t-butyl hydrogen peroxide, cumyl peroxide, di-tert-butyl peroxide, dibenzoyl peroxide, peroxide
Change the special butyl ester of lauroyl, perbenzoic acid, peroxide tert pivalate ester, di-isopropyl peroxydicarbonate, peroxidating two
At least one of dicyclohexyl carbonate) in the environment that exists, promote polymer monomer to occur polymerisation, obtain network-like knot
Structure high molecular polymer.
The advantage of the invention is that：
1. the headspace of microcellular structure formation can be silicon grain volumetric expansion reserved location in charging process, so that
Obtaining material has more preferable chemical property；
2. in pore creating material removal process, it will produce gas component, gas component will be rejected to two inside second particle
Secondary extra-granular, in exclusion process, will get through the passage that ion enters inside second particle outside second particle, improves material
The dynamic performance of material；
3. polymer monomer has lower viscosity, it is more beneficial for being uniformly dispersed with the primary particle of nanostructured；Simultaneously
Monomer in situ polymerization obtains polymer, and be carbonized again obtains conductive network afterwards, can effectively improve connecing between primary particle
Effect is touched, resistance is reduced, improves the chemical property of silicon-carbon cathode.
Embodiment
The present invention and its advantage are described in detail with reference to embodiment, but the embodiment party of the present invention
Formula not limited to this.
Comparative example, prepares the silicon-carbon second particle material that particle diameter is 12 μm；
It is prepared by step 1. nuclear structure：100nm silicon grain is selected, (silicon grain content is 90%, conductive with conductive agent component
Agent is Super P) pelletizing is carried out after uniform mixing, obtain the second particle nuclear structure that particle diameter is about 12 μm stand-by；
Step 2., as covering material, is coated to the nuclear structure that step 1 is prepared, is carbonized afterwards from pitch,
Obtain the silicon-carbon cathode material that particle diameter is 12 μm.
Embodiment 1, is that the present embodiment comprises the following steps with comparative example difference：
Step 1. is by 100nm silicon grain, with conductive agent component (silicon grain:Conductive agent=9:1, mass ratio, similarly hereinafter), carbon
Sour hydrogen ammonium (account for solid constituent volume 1%), NMP are uniformly mixed, and obtain precursor pulp；
Step 2. controls temperature within 30 DEG C, carries out pelletizing, obtains nuclear structure presoma；
Step 3. heats nuclear structure presoma, removes ammonium hydrogen carbonate；Selection pitch is that clad raw material is wrapped afterwards
Cover, finally carbonization obtains silicon-carbon cathode material.
It is other identical with comparative example, it is not repeated herein.
Embodiment 2, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 100nm silicon grain, with conductive agent component (silicon grain:Conductive agent=9:1), ammonium hydrogen carbonate (accounts for solid
Body volume components 5%), NMP uniformly mix, obtain precursor pulp；
It is other identical with embodiment 1, it is not repeated herein.
Embodiment 3, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 100nm silicon grain, with conductive agent component (silicon grain:Conductive agent=9:1), ammonium hydrogen carbonate (accounts for solid
Body volume components 10%), NMP uniformly mix, obtain precursor pulp；
It is other identical with embodiment 1, it is not repeated herein.
Embodiment 4, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 100nm silicon grain, with conductive agent component (silicon grain:Conductive agent=9:1), ammonium hydrogen carbonate (accounts for solid
Body volume components 20%), NMP uniformly mix, obtain precursor pulp；
It is other identical with embodiment 1, it is not repeated herein.
Embodiment 5, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 100nm silicon grain, with conductive agent component (silicon grain:Conductive agent=9:1), ammonium hydrogen carbonate (accounts for solid
Body volume components 40%), NMP uniformly mix, obtain precursor pulp；
It is other identical with embodiment 1, it is not repeated herein.
Embodiment 6, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 100nm silicon grain, with conductive agent component (silicon grain:Conductive agent=9:1), ammonium hydrogen carbonate (accounts for solid
Body volume components 80%), NMP uniformly mix, obtain precursor pulp；
It is other identical with embodiment 1, it is not repeated herein.
Embodiment 7, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 50nm silicon grain, with CNT (silicon grain:CNT=9:1), ammonium nitrate (accounts for solid group
Partial volume 20%), water uniformly mix, obtain precursor pulp；
Step 2. controls temperature within 100 DEG C, carries out pelletizing, obtains nuclear structure presoma；
It is that clad raw material is coated, is finally carbonized that pitch is selected after step 3., in carbonisation, ammonium nitrate point
Solution, reserves itself shared volume, is used as reserved pore volume；Finally obtain the silicon-carbon cathode material that particle diameter is 1 μm
It is other identical with embodiment 1, it is not repeated herein.
Embodiment 8, difference from Example 1 is, the present embodiment comprises the following steps：
Step 1. is by 50nm silicon grain, dodecyl acrylate, CNT (silicon grain:Dodecyl acrylate:Carbon nanometer
Pipe=9:0.5:0.5), ammonium nitrate (account for solid constituent volume 20%), water is uniformly mixed, and obtains precursor pulp；
Step 2. controls temperature within 100 DEG C, carries out pelletizing, obtains nuclear structure presoma；Peroxidating two is added afterwards
Benzoyl, promotes monomer to polymerize, and forms polymer mesh structure；
It is that clad raw material is coated, is finally carbonized that pitch is selected after step 3., in carbonisation, ammonium nitrate point
Solution, reserves itself shared volume, is used as reserved pore volume；Finally obtain the silicon-carbon cathode material that particle diameter is 12 μm
It is other identical with embodiment 1, it is not repeated herein.
Battery is assembled：It is the silicon-carbon cathode material that comparative example, embodiment 1- embodiments 10 are prepared and conductive agent, Nian Jie
Agent, stirring solvent obtain electrode slurry, apply form negative electrode on a current collector afterwards；By negative electrode and anode electrode
The assembling of (cobalt acid lithium is active material), barrier film obtains naked battery core, and bag is entered afterwards and carries out top side seal, drying, fluid injection, standing, change
Resultant battery is obtained into, shaping, degasification.
Material properties test：
Gram volume is tested：Each embodiment and comparative example silicon carbon material are prepared by following flow in 25 DEG C of environment
Battery core carries out gram volume test：Stand 3min；0.2C constant-current charges are to 4.2V, 4.2V constant-voltage charges to 0.05C；Stand 3min；
0.2C constant-current discharges obtain discharge capacity D1 to 3.0V；Stand 3min；0.2C constant-current discharges are to 3.85V；It is complete after standing 3min
Into volume test, the weight of silicon carbon material, that is, obtain negative pole gram volume, acquired results are shown in Table 1 in D1 divided by negative electricity pole piece.
High rate performance is tested：Each embodiment and comparative example silicon carbon material are prepared by following flow in 25 DEG C of environment
Battery core carry out high rate performance test：Stand 3min；0.2C constant-current charges are to 4.2V, 4.2V constant-voltage charges to 0.05C；Stand
3min；0.2C constant-current discharges obtain discharge capacity D1 to 3.0V；Stand 3min；0.2C constant-current charges to 4.2V, 4.2V constant pressures is filled
Electricity is to 0.05C；Stand 3min；2C constant-current discharges obtain discharge capacity D21 to 3.0V；Stand 3min；High rate performance is completed afterwards
Test, battery high rate performance=D2/D1*100%, acquired results are shown in Table 1.
Loop test:The electricity prepared in 25 DEG C of environment by following flow to each embodiment and comparative example silicon carbon material
Core carries out loop test：Stand 3min；0.2C constant-current charges are to 4.2V, 4.2V constant-voltage charges to 0.05C；Stand 3min；0.2C
Constant-current discharge obtains discharge capacity D1 to 3.0V；3min is stood, " 0.2C constant-current charges to 4.2V, 4.2V constant-voltage charges are extremely
0.05C；Stand 3min；0.2C constant-current discharges obtain discharge capacity Di to 3.0V；3min " is stood to repeat to obtain D300 299 times,
Loop test is completed afterwards, and calculating capability retention is D300/D1*100%, and acquired results are shown in Table 1.
The chemical property of the battery core of silicon-carbon cathode material system assembling prepared by table 1, different comparative examples and embodiment
Can be obtained by table 1, the present invention can prepare the silicon-carbon cathode material of function admirable, using the silicon-carbon cathode material as
The battery core that negative electrode active material assembling is obtained has excellent chemical property.Specifically, comparative examples are real with embodiment 1-
Applying example 6 can be obtained, with the increase of porosity, and the gram volume of silicon-carbon cathode material first increases to be reduced afterwards；After cycle performance is first lifted
Reduction, high rate performance has gradually increased trend；When this is due to that porosity is excessive, the poor processability of material in itself,
(roll process) will destroy the structure of material during preparing battery, cause degradation.It can be obtained by embodiment 8, work as addition
During in-situ polymerization effect, the silicon-carbon cathode prepared has more excellent chemical property.It can be obtained by each embodiment, this hair
It is bright that there is universality.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in above-mentioned embodiment, every those skilled in the art exist
Made any conspicuously improved, replacement or modification belong to protection scope of the present invention on the basis of the present invention.This
Outside, although having used some specific terms in this specification, these terms merely for convenience of description, not to the present invention
Constitute any limitation.
Claims (10)
1. a kind of silicon-carbon cathode material, including nuclear structure and shell structure, it is characterised in that the nuclear structure includes primary particle
And conductive component, the primary particle is closely joined together with the conductive component；It is uniform-distribution with the nuclear structure micro-
Pore structure, the pore volume of the microcellular structure accounts for the 1%~80% of whole nuclear structure volume.
2. the silicon-carbon cathode material described in a kind of claim 1, it is characterised in that the primary particle includes silica-base material once
Particle；The conductive component is the conductive agent that conventional conductive agent or/and organic carbon are obtained；The primary particle is dispersed
In the conductive network structure that the conductive component is constituted；Particle diameter D1 >=1 μm of the nuclear structure, the silica-base material one
Diameter D2≤5 μm of secondary particle.
3. the silicon-carbon cathode material described in a kind of claim 2, it is characterised in that the silica-base material primary particle includes simple substance
Silicon or/and Si oxide；The non-silicon sill primary particle includes native graphite, Delanium, carbonaceous mesophase spherules, soft
Carbon, hard carbon, petroleum coke, carbon fiber, thermal decomposed resins carbon, lithium titanate, tin base cathode material, transition metal nitride, kamash alloy,
At least one of germanium-base alloy, acieral, antimony-containing alloy, magnesium base alloy；The conventional conductive agent includes conductive black, surpassed
At least one of level conductive carbon, Ketjen black, CNT, graphene, acetylene black；The organic matter include organic carbon source or/
And high molecular polymer.
4. the silicon-carbon cathode material described in a kind of claim 3, it is characterised in that the high molecular polymer is high polymer monomer
In-situ polymerization and obtain；The high polymer monomer includes esters of acrylic acid, methyl acrylic ester, styrene, acrylonitrile, methyl-prop
Alkene nitrile, polyethylene glycol dimethacrylate, polyethyleneglycol diacrylate, divinylbenzene, trimethylol propane trimethyl
Acrylate, methyl methacrylate, N, N- DMAAs, N- acryloyl morpholines, methyl acrylate, acrylic acid second
Ester, butyl acrylate, positive Hexyl 2-propenoate, 2- cyclohexyl acrylates, dodecyl acrylate, GDMA,
Polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, neopentylglycol diacrylate, 1,6-HD two
Acrylate, tetraethylene glycol diacrylate, tri (propylene glycol) diacrylate, ethoxyquin tetramethylol methane tetraacrylate, third
Aoxidize pentaerythritol acrylate, double-Glycerin tetraacrylate, pentaerythritol triacrylate, trimethylolpropane
Trimethyl acrylic ester, glycerol propoxylate triacrylate, three (2- ethoxys) isocyanuric acid triacrylate trihydroxy methyls third
Alkane triacrylate, propoxylation trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, second
Epoxide trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, pentaerythrite tetrapropylene acid
At least one of ester.
5. the preparation method of the silicon-carbon cathode material described in a kind of claim 1, it is characterised in that mainly comprise the following steps：
Step 1, primary particle, conventional conductive agent component or/and conductive agent component presoma, pore creating material, solvent are well mixed,
Obtain precursor solution；
Step 2, precursor solution pelletizing step 1 obtained, obtains nuclear structure presoma；
Step 3, pore creating material is removed, is coated afterwards, being carbonized obtains silicon-carbon cathode material；
Or
Step 3 ', coated, be carbonized afterwards, during remove pore creating material be to obtain silicon-carbon cathode material.
6. the preparation method of the silicon-carbon cathode material described in a kind of claim 5, it is characterised in that pore creating material is described in step 1
Can distil, resolve into the solid constituent of gas component.
7. the preparation method of the silicon-carbon cathode material described in a kind of claim 6, it is characterised in that pore creating material is described in step 1
Benzoic acid, oxalic acid, how at least one of ball, ammonium hydrogen carbonate, ammonium carbonate, ammonium chloride, ammonium nitrate.
8. the preparation method of the silicon-carbon cathode material described in a kind of claim 5, it is characterised in that the primary particle includes silicon
Sill primary particle and/or non-silicon sill primary particle；The conventional conductive agent include conductive black, super conductive carbon,
At least one of Ketjen black, CNT, graphene, acetylene black；The conductive agent component presoma includes organic carbon source, height
At least one of Molecularly Imprinted Polymer, polymer monomer.
9. the preparation method of the silicon-carbon cathode material described in a kind of claim 8, it is characterised in that the polymer monomer includes
It is esters of acrylic acid, methyl acrylic ester, styrene, acrylonitrile, methacrylonitrile, polyethylene glycol dimethacrylate, poly-
Glycol diacrylate, divinylbenzene, trimethylol-propane trimethacrylate, methyl methacrylate, N, N- bis-
Methacrylamide, N- acryloyl morpholines, methyl acrylate, ethyl acrylate, butyl acrylate, positive Hexyl 2-propenoate, 2- third
Olefin(e) acid cyclohexyl, dodecyl acrylate, GDMA, polyethylene glycol dimethacrylate, polyethylene glycol
Dimethylacrylate, neopentylglycol diacrylate, 1,6 hexanediol diacrylate, tetraethylene glycol diacrylate, two contractings
Tripropylene glycol diacrylate, ethoxyquin tetramethylol methane tetraacrylate, the third oxidation pentaerythritol acrylate, double-trihydroxy
Tetraacrylate, pentaerythritol triacrylate, trimethylol-propane trimethacrylate, the propylene of glycerol propoxylate three
Acid esters, three (2- ethoxys) isocyanuric acid triacrylate trimethylolpropane trimethacrylates, propoxylation trihydroxy methyl third
Alkane triacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, second
At least one of epoxide trimethylolpropane trimethacrylate, tetramethylol methane tetraacrylate.
10. the preparation method of the silicon-carbon cathode material described in a kind of claim 8, it is characterised in that when conductive group described in step 1
When dividing presoma to include polymer monomer, after step 2 pelletizing, nuclear structure presoma is obtained, initiator is placed in afterwards and is deposited
Environment in, promote polymer monomer occur polymerisation, obtain network-like structure high molecular polymer.
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| CN108493401A (en) * | 2018-03-19 | 2018-09-04 | 清华大学深圳研究生院 | A kind of sodium-ion battery combination electrode |
| CN110277543A (en) * | 2018-03-16 | 2019-09-24 | 国家能源投资集团有限责任公司 | Mix negative electrode material and cathode pole piece and preparation method thereof |
| CN110911630A (en) * | 2019-10-23 | 2020-03-24 | 东北大学 | High-porosity lithium ion battery pole piece and preparation method thereof |
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| CN103346293A (en) * | 2013-06-28 | 2013-10-09 | 中国科学院宁波材料技术与工程研究所 | Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery |
| CN103682283A (en) * | 2012-09-24 | 2014-03-26 | 三星电子株式会社 | Composite anode active material, anode and lithium battery each including the composite anode active material, method of preparing the composite anode active material |
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| CN110277543A (en) * | 2018-03-16 | 2019-09-24 | 国家能源投资集团有限责任公司 | Mix negative electrode material and cathode pole piece and preparation method thereof |
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