CN107069038A - 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
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- H01M4/362—Composites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H—ELECTRICITY
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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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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- 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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- 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 shell structure is uniformly wrapped on the nuclear structure surface, the nuclear structure particle diameter is D1, and the shell structure thickness is h1, contains graphene in the shell structure, the graphene sheet layer thickness h 2≤100nm, the graphene sheet layer planar diameter d1≤π * D1.So as to prepare the silicon-carbon cathode material of excellent electrochemical performance.
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, it is and 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 or coated on silicon-carbon cathode material surface, in limitation material volume expansion
While, moreover it is possible to obstruct silica-base material and directly contacted with electrolyte, so as to while cycle performance of battery is improved, reduce charge and discharge
Side reaction in electric process between silica-base material and electrolyte.
Itself it is a kind of excellent covering material because grapheme material has unique flexible two-dimension plane structure,
Silicon-carbon cathode material surface can be coated on.But its two-dimentional lamellar structure to ion the transmitting procedure inside and outside silicon-carbon cathode particle
In have obvious inhibition, so as to have influence on the performance of silicon carbon material dynamic performance.
In view of this, it is necessory to propose a kind of silicon-carbon cathode material and preparation method thereof, it can both give play to graphene
Sharpest edges, be avoided that it on influenceing transmission of the ion inside and outside silicon carbon material after silicon carbon material Surface coating again.
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 shell structure are uniformly wrapped on the nuclear structure surface, and the nuclear structure particle diameter is D1, the shell knot
Structure thickness is h1, contains graphene, 2≤100nm of the graphene sheet layer thickness h, the graphene sheet layer in the shell structure
Planar diameter d1≤π * D1.So as to prepare the silicon-carbon cathode material of excellent electrochemical performance.
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 shell structure are uniformly wrapped on the nuclear structure table
Face, it is characterised in that the nuclear structure particle diameter is D1, the shell structure thickness is h1, contains graphite in the shell structure
Alkene, the graphene sheet layer thickness h 2≤100nm, the graphene sheet layer planar diameter d1≤π * D1, i.e., now, graphene film
Layer at most envelopes the half region of nuclear structure, will not completely enclose transmission of the ion inside and outside silicon-carbon cathode material.
Improved as one kind of silicon-carbon cathode material of the present invention, the nuclear structure is primary particle structure or second particle knot
Structure or multiple particle structure；In the nuclear structure include silicon based anode material, the silica-base material include pure silicon, Si oxide,
At least one of silicon based composite material, modified silica-base material, can also include non-silicon-based negative material, the non-silicon containing component
Particle includes native graphite, Delanium, carbonaceous mesophase spherules, soft carbon, hard carbon, petroleum coke, carbon fiber, thermal decomposed resins carbon, carbon
At least one of sour lithium, non-silicon alloy material of cathode.
Improved as one kind of silicon-carbon cathode material of the present invention, the π D1/3 of the graphene sheet layer planar diameter d1≤2, when
Graphene coated is at primary particle surface, if d1=2 π D1/3, then ion is by graphene sheet layer edge-diffusion to graphite
Path during alkene lamella central area, is exactly equal to the path that ion has nuclear structure diffusion into the surface to enter core central area, now
Dynamic performance influence of the graphene sheet layer on silicon-carbon cathode material is smaller.
Improved as one kind of silicon-carbon cathode material of the present invention, in the clad, also include traditional clad or/and
The polymer carbonization component that monomer in situ polymerization is obtained.
Improved as one kind of silicon-carbon cathode material of the present invention, traditional clad is that traditional clad raw material is carbonized
Arrive；Traditional clad raw material is phenolic resin, melamine resin, Vinylidene Chloride, pitch, polyethylene, stearic acid, PVC, poly- third
Alkene nitrile, natural rubber, butadiene-styrene rubber, butadiene rubber, EP rubbers, polyethylene, polypropylene, polyamide, poly terephthalic acid second
At least one in diol ester, nano cupric oxide, nano magnesia, nano-titanium oxide, nano aluminium oxide, nano-graphite, graphite flake
Kind；The monomer includes esters of acrylic acid, methyl acrylic ester, styrene, acrylonitrile, methacrylonitrile, polyethylene glycol two
Methacrylate, polyethyleneglycol diacrylate, divinylbenzene, trimethylol-propane trimethacrylate, methyl-prop
E pioic acid methyl ester, N, N- DMAAs, N- acryloyl morpholines, methyl acrylate, ethyl acrylate, butyl acrylate, just
Hexyl 2-propenoate, 2- cyclohexyl acrylates, dodecyl acrylate, GDMA, polyethylene glycol dimethyl propylene
Olefin(e) acid ester, polyethylene glycol dimethacrylate, neopentylglycol diacrylate, 1,6 hexanediol diacrylate, tetraethylene glycol
Diacrylate, tri (propylene glycol) diacrylate, ethoxyquin tetramethylol methane tetraacrylate, the third oxidation pentaerythrite propylene
Acid esters, double-Glycerin tetraacrylate, pentaerythritol triacrylate, trimethylol-propane trimethacrylate, third
Aoxidize glycerol tri-acrylate, three (2- ethoxys) isocyanuric acid triacrylate trimethylolpropane trimethacrylates, the third oxygen
Base trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylation trihydroxy methyl third
At least one of alkane triacrylate, ethoxylated trimethylolpropane triacrylate, tetramethylol methane tetraacrylate.
Present invention additionally comprises a kind of preparation method of silicon-carbon cathode material, mainly comprise the following steps：
Step 1, selection nuclear structural materials are standby；
Step 2, the clad slurry containing graphene sheet layer is prepared；
Step 3, nuclear structural materials described in step 1 are placed in the slurry that step 2 is obtained and coated, is carbonized afterwards
Obtain finished silicon carbon negative pole material.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, biography can also be included in the clad slurry
System clad raw material or/and polymer monomer.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, when containing polymer monomer in the clad
When, after the step 3 cladding process, inducer need to be added and promote monomer in situ polymerization formation polymer, now, step 3
For：Nuclear structural materials described in step 1 are placed in the slurry that step 2 is obtained and coated, is subsequently placed in and exists with inducer
Environment in induce monomer in situ polymerization；Finally it is carbonized and obtains finished silicon carbon negative pole material.The inducer is to trigger
Agent, the initiator include isopropyl benzene hydroperoxide, t-butyl hydrogen peroxide, cumyl peroxide, di-tert-butyl peroxide,
The special butyl ester of dibenzoyl peroxide, dilauroyl peroxide, perbenzoic acid, peroxide tert pivalate ester, the carbon of peroxidating two
At least one of sour diisopropyl ester, di-cyclohexylperoxy di-carbonate.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, the preparation described in step 2 contains graphene film
During the clad slurry of layer, surfactant can also be added, the surfactant includes the surfactant
At least one of wetting agent, dispersant, bleeding agent, solubilizer, cosolvent, cosolvent are included for surfactant；The profit
Humectant is anionic or/and non-ionic wetting agent；The dispersant is scattered for fatty acid/aliphatic amide type/esters
An at least class in agent, paraffin class, metal soap, low molecule wax class, HPMA；The bleeding agent for it is non-ionic or/and it is cloudy from
Subtype bleeding agent；The anionic wetting agents include alkyl sulfate, sulfonate, aliphatic acid or fatty acid ester sulfate, carboxylic
At least one of sour soaps and phosphate；The non-ionic wetting agent includes polyoxyethylated alkyl phenol, polyoxyethylene fat
At least one of fat alcohol ether and polyoxyethylene polyoxypropylene block copolymer；The dispersant be vinyl bis-stearamides,
Oleic acid acyl, glyceryl monostearate, glyceryl tristearate, atoleine, microcrystalline wax, barium stearate, zinc stearate, tristearin
At least one of sour calcium, Tissuemat E and polyethylene glycol；The nonionic penetrant comprising JFC, JFC-1, JFC-2 and
At least one of JFC-E；The anionic bleeding agent includes fast penetrant T, alkali-resistant penetrant OEP-70, alkaline-resisting infiltration
At least one of agent AEP and seeping at high temperature agent JFC-M；The cosolvent includes benzoic acid, sodium benzoate, salicylic acid, bigcatkin willow
At least one of sour sodium, p-aminobenzoic acid, urethane, urea, acid amides, acetamide, borax and KI；The cosolvent
Including at least one of ethanol, glycerine, propane diols and polyethylene glycol.
Improved as one kind of silicon-carbon cathode material preparation method of the present invention, nuclear structural materials material grainses described in step 1
A diameter of D1, D1≤1 μm；Graphene sheet layer planar diameter d1 described in step 2≤π * D1.
The advantage of the invention is that：
1. the graphene coated structure of flexible, planar structure can be coated with significantly more efficient, be obstructed electrolyte and core
The direct contact of structure, improves the chemical property of material；
2.d1≤π D1 (smaller scope d1≤2 π D1/3) are that graphene sheet layer planar diameter is no more than nuclear structure girth
Half, because the graphene of planar structure has inhibition to ion diffusion, but it is of the present invention compared with facet when using
During size graphite alkene, ion is smaller around row distance (distance of second particle radius length), therefore inhibition is faint, and silicon-carbon is born
Pole material has excellent chemical property；
3. containing small molecule monomer in-situ polymerization component in clad, it can effectively improve each group inside clad and divide it
Between connection effect, and the electronic conductance effect between clad and nuclear structure, because small molecule monomer is easier and other
Component infiltration, uniform mixing.
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 cathode material that particle diameter is 12 μm；
It is prepared by step 1. nuclear structure：100nm silicon grain is selected, pelletizing is carried out after uniformly being mixed with conductive agent component, obtains
It is stand-by to the second particle nuclear structure that particle diameter is about 12 μm；
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：
It is prepared by step 1. nuclear structure：100nm silicon grain is selected, pelletizing is carried out after uniformly being mixed with conductive agent component, obtains
It is stand-by to the second particle nuclear structure that particle diameter is about 12 μm；
Step 2, clad slurry is prepared：Pitch is heats liquefied；By a diameter of 37.68 μm of graphene uniform of lamella
It is dispersed in nmp solvent, adds afterwards in pitch；It is uniformly mixing to obtain clad raw material；
Step 3, nuclear structural materials described in step 1 are placed in the clad raw material that step 2 is obtained and coated, it is laggard
Row carbonization obtains finished silicon carbon negative pole material.
Embodiment 2, difference from Example 1 is, the present embodiment comprises the following steps：
Step 2, clad slurry is prepared：Pitch is heats liquefied；By a diameter of 25.12 μm of graphene uniform of lamella
It is dispersed in nmp solvent, adds afterwards in pitch；It is uniformly mixing to obtain clad raw material；
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 2, clad slurry is prepared：Pitch is heats liquefied；By point of a diameter of 15 μm of graphene uniform of lamella
It is dispersed in nmp solvent, adds afterwards in pitch；It is uniformly mixing to obtain clad raw material；
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 2, clad slurry is prepared：Pitch is heats liquefied；By the scattered of a diameter of 5 μm of graphene uniform of lamella
In nmp solvent, add afterwards in pitch；It is uniformly mixing to obtain clad raw material；
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 2, clad slurry is prepared：Pitch is heats liquefied；By the scattered of a diameter of 1 μm of graphene uniform of lamella
In nmp solvent, add afterwards in pitch；It is uniformly mixing to obtain clad raw material；
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 2, clad slurry is prepared：Pitch is heats liquefied；By point of a diameter of 0.2 μm of graphene uniform of lamella
It is dispersed in nmp solvent, adds afterwards in pitch；It is uniformly mixing to obtain clad raw material；
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, prepared by nuclear structure：100nm silicon grain is selected, pelletizing is carried out after uniformly being mixed with conductive agent component, obtains
It is stand-by to the second particle nuclear structure that particle diameter is about 12 μm；
Step 2, clad slurry is prepared：By trimethylol-propane trimethacrylate and the stone of a diameter of 5 μm of lamella
Black alkene is mediated, after being well mixed；It is well mixed afterwards with phenolic resin and obtains clad slurry；
Step 3, nuclear structural materials described in step 1 are placed in the clad slurry that step 2 is obtained and coated, it is rearmounted
In BPO solution, promote monomer to carry out in-situ polymerization generation polymer, the polymer of generation by inside clad, clad
It is closely joined together between nuclear structure；Finally it is carbonized and obtains finished silicon carbon negative pole material.
It is other identical with comparative example 1, it is not repeated herein.
Embodiment 8, prepares the silicon-carbon cathode material that particle diameter is 100 μm；
Step 1：Prepared by nuclear structure, selection particle diameter is the 200nm sub- silicon of oxidation, Delanium hybrid particles are as once
Grain, wherein the sub- silicone content of oxidation is 10%；CNT, super conductive carbon mix are conductive agent component；By silane coupler,
Primary particle is mixed, and a small amount of N is added afterwards, N- dimethyl pyrrolidone solution is mediated, and obtains primary particle dispersed
Slurry；Conductive agent, PVP are mixed, a small amount of N is added afterwards, N- dimethyl pyrrolidone solution is mediated, and obtains graphene
Dispersed slurry；Two kinds of slurries are uniformly mixed, pelletizing obtains nuclear structure afterwards；
Step 2, clad slurry is prepared：Lamellar spacing is mixed for graphene, PVP, NMP of a diameter of 5 μm of 100nm lamellas
Conjunction is mediated, after being well mixed；It is well mixed afterwards with phenolic resin and obtains clad slurry；
It is other identical with comparative example 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.
Battery core gram volume, circulation volume conservation rate and high rate performance that table 1, different silicon-carbon cathode materials are prepared
It can be obtained by table 1, silicon-carbon cathode material prepared by the present invention, with more outstanding chemical property：It is i.e. higher
Gram volume, more preferable circulation volume conservation rate and higher high rate performance.Specifically, comparative examples are implemented with embodiment 1-
Example 6 can be obtained, with the reduction of clad graphene sheet layer, and the gram volume of material first increases, keeps stable afterwards, and cycle performance is gradually
Decay, high rate performance are gradually stepped up, because after graphene sheet layer reduces, it is reduced to the inhibition that ion is transmitted, but
Covered effect has the trend of variation.Can be obtained by each embodiment, the present invention have universality, be adapted to various silicon-carbon cathode materials and its
Preparation method.
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, the shell structure are uniformly wrapped on the table of the nuclear structure
Face, it is characterised in that the particle diameter of the nuclear structure is D1,
Contain graphene in the shell structure, lamellar spacing h2≤100nm of the graphene,
The slice plane diameter d1 of the graphene≤π * D1.
2. the silicon-carbon cathode material described in a kind of claim 1, it is characterised in that the nuclear structure is primary particle structure or two
Silicon based anode material is included in secondary grain structure, the nuclear structure.
3. the silicon-carbon cathode material described in a kind of claim 1, it is characterised in that the slice plane diameter d1 of the graphene≤
2πD1/3。
4. the silicon-carbon cathode material described in a kind of claim 1, it is characterised in that in the shell structure, also include clad
Or/and the polymer carbonization component layers that monomer in situ polymerization is obtained.
5. the silicon-carbon cathode material described in a kind of claim 4, it is characterised in that the clad is traditional clad raw material charcoal
Change is obtained；Traditional clad raw material be phenolic resin, melamine resin, Vinylidene Chloride, pitch, polyethylene, stearic acid, PVC,
Polyacrylonitrile, natural rubber, butadiene-styrene rubber, butadiene rubber, EP rubbers, polyethylene, polypropylene, polyamide, poly- terephthaldehyde
In sour glycol ester, nano cupric oxide, nano magnesia, nano-titanium oxide, nano aluminium oxide, nano-graphite, graphite flake extremely
Few one kind；The monomer includes esters of acrylic acid, methyl acrylic ester, styrene, acrylonitrile, methacrylonitrile, poly- second two
Alcohol dimethylacrylate, polyethyleneglycol diacrylate, divinylbenzene, trimethylol-propane trimethacrylate, first
Base methyl acrylate, N, N- DMAAs, N- acryloyl morpholines, methyl acrylate, ethyl acrylate, acrylic acid fourth
Ester, positive Hexyl 2-propenoate, 2- cyclohexyl acrylates, dodecyl acrylate, GDMA, polyethylene glycol diformazan
Base acrylate, polyethylene glycol dimethacrylate, neopentylglycol diacrylate, 1,6 hexanediol diacrylate, four
Glycol diacrylate, tri (propylene glycol) diacrylate, ethoxyquin tetramethylol methane tetraacrylate, the third oxidation pentaerythrite
Acrylate, double-Glycerin tetraacrylate, pentaerythritol triacrylate, trimethylol propane trimethyl acrylic acid
Ester, glycerol propoxylate triacrylate, three (2- ethoxys) isocyanuric acid triacrylate trimethylolpropane trimethacrylates,
Propoxylation trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, the hydroxyl first of ethoxylation three
At least one in base propane triacrylate, ethoxylated trimethylolpropane triacrylate, tetramethylol methane tetraacrylate
Kind.
6. 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, selection nuclear structural materials are standby；
Step 2, the clad slurry containing graphene sheet layer is prepared；
Step 3, nuclear structural materials described in step 1 are placed in the slurry that step 2 is obtained and coated, carbonization is carried out afterwards and is produced
To finished product silicon-carbon cathode material.
7. the preparation method of the silicon-carbon cathode material described in a kind of claim 6, it is characterised in that in the clad slurry also
Include clad raw material or/and polymer monomer.
8. the preparation method of the silicon-carbon cathode material described in a kind of claim 7, it is characterised in that contain when in the clad
During polymer monomer, after the step 3 cladding process, inducer need to be added and promote monomer in situ polymerization formation polymer.
9. the preparation method of the silicon-carbon cathode material described in a kind of claim 6, it is characterised in that the preparation described in step 2 contains
During the clad slurry for having graphene sheet layer, be additionally added surfactant, the surfactant include wetting agent,
At least one of dispersant, bleeding agent, solubilizer, cosolvent, cosolvent.
10. a kind of preparation method of the silicon-carbon cathode material described in claim 6, it is characterised in that nuclear structure material described in step 1
Particle diameter D1≤1 μm of material；The planar diameter d1 of graphene sheet layer described in step 2≤π * D1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109585820A (en) * | 2018-11-23 | 2019-04-05 | 四川大学 | Si-C composite material, preparation method, application and negative electrode of lithium ion battery |
| CN110085820A (en) * | 2019-04-17 | 2019-08-02 | 中国航发北京航空材料研究院 | A kind of preparation method of the porous graphene silicium cathode material based on supercritical fluid auxiliary |
| CN110112384A (en) * | 2019-04-17 | 2019-08-09 | 中国航发北京航空材料研究院 | A kind of preparation method of porous graphene silicium cathode material |
| CN112421002A (en) * | 2020-11-10 | 2021-02-26 | 成都爱敏特新能源技术有限公司 | High-capacity silicon-carbon material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109585820A (en) * | 2018-11-23 | 2019-04-05 | 四川大学 | Si-C composite material, preparation method, application and negative electrode of lithium ion battery |
| CN110085820A (en) * | 2019-04-17 | 2019-08-02 | 中国航发北京航空材料研究院 | A kind of preparation method of the porous graphene silicium cathode material based on supercritical fluid auxiliary |
| CN110112384A (en) * | 2019-04-17 | 2019-08-09 | 中国航发北京航空材料研究院 | A kind of preparation method of porous graphene silicium cathode material |
| CN112421002A (en) * | 2020-11-10 | 2021-02-26 | 成都爱敏特新能源技术有限公司 | High-capacity silicon-carbon material and preparation method thereof |
| CN112421002B (en) * | 2020-11-10 | 2022-03-29 | 成都爱敏特新能源技术有限公司 | High-capacity silicon-carbon material and preparation method thereof |
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