CN108183199A - A kind of lithium ion battery is modified silicon based anode material and preparation method thereof - Google Patents
A kind of lithium ion battery is modified silicon based anode material and preparation method thereof Download PDFInfo
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- CN108183199A CN108183199A CN201711183576.6A CN201711183576A CN108183199A CN 108183199 A CN108183199 A CN 108183199A CN 201711183576 A CN201711183576 A CN 201711183576A CN 108183199 A CN108183199 A CN 108183199A
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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
- H01M4/362—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
- 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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- 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
- H01M4/38—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
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of lithium ion batteries to be modified silicon based anode material, including amorphous silica matrix, multiple nano-silicon cores, conductive black and carbon coating layer；In the multiple nano-silicon core insertion amorphous silica matrix, conductive black is distributed in around nano-silicon core, and carbon coating layer is coated on outside amorphous silica matrix.The invention also provides a kind of lithium ion battery is modified the preparation method of silicon based anode material, including：Nano silica fume is added in aqueous slkali, add in conductive black and is uniformly dispersed to obtain intermediate material；Carbon source is added in intermediate material, is spray-dried after stirring, is then sintered under the protection of inert gas.Lithium ion battery proposed by the present invention is modified silicon based anode material and preparation method thereof, the preparation method process is simple, is easy to mass produce, and obtained modification silicon based anode material can effectively inhibit silicon volume expansion, there is higher electron conduction simultaneously, the cycle performance of battery with its making is good.
Description
Technical field
The present invention relates to lithium ion battery material technical fields more particularly to a kind of lithium ion battery to be modified silicon-based anode material
Material and preparation method thereof.
Background technology
With the development of electric vehicle and portable electrical appliance, the demand of lithium ion battery with high energy density also increasingly increases
Add.Conventional graphite negative material theoretical specific capacity only has 372mAh/g, it is difficult to meet the market demand.The gram volume for the first time of silicon materials
For 4200mAh/g, embedding lithium platform higher, earth's crust storage is abundant, the advantages such as environmentally friendly, gradually causes the extensive pass of researcher
Note.
However the volume expansion of silicon is up to 300%, in cyclic process, not only results in silicon and the conductive charcoal network of surrounding
Separation forms " dead silicon ", it is peeling-off with collector to also result in silicon.Secondly, larger volume expansion also results in surface
SEI films constantly recombinate destruction, make SEI films more and more thicker, constantly consume the Li+ of anode, and coulombic efficiency reduces.Finally, it is larger
The phase leads to silicon materials dusting after cycling for volume expansion, these problems eventually lead to cycle performance and drastically deteriorate.
Due to the above problem, part attention is transferred on the sub- silicon of oxidation by academia with industrial circle.Compared with nano-silicon,
Although the sub- silicon of oxidation sacrifices portion capacity, but its expansion is relatively small (~100%), and generated in charge and discharge process
By-product lithia, lithium metasilicate, lithium metasilicate etc. can provide cushioning effect, greatly improve the cycle performance of material.But
The electric conductivity of material is relatively poor, and head effects are relatively low.[201610978504.X] etc. discloses a kind of modified oxidized sub- silicon of graphene
With carbon complex microsphere and its preparation method and application, this method can improve the cyclical stability of material, but due to oxidation
The defects of sub- silicon materials itself, for the first time coulombic efficiency raising are relatively small.[Shi L, Pang C, the Chen S, et such as Shi
al.Vertical graphene growth on SiO microparticles for stable lithium ion
Battery anodes [J] .Nano Letters, 2017.] by CVD method, the graphene of growth of vertical is received on commercialization SiO
Rice piece, cycle performance is preferable, but preparation method cost is higher, mass produces relative difficulty, while first effect promotion is opposite
It is less.
Invention content
Technical problems based on background technology, the present invention propose a kind of lithium ion battery and are modified silicon based anode material
And preparation method thereof, the preparation method process is simple, is easy to mass produce, and obtained modification silicon based anode material can be effective
Inhibit silicon volume expansion, while there is higher electron conduction, the cycle performance of battery with its making is good.
A kind of lithium ion battery proposed by the present invention is modified silicon based anode material, and the modified silicon based anode material includes nothing
Sizing silica substrate, multiple nano-silicon cores, conductive black and carbon coating layer；
Wherein, in the multiple nano-silicon core insertion amorphous silica matrix, conductive black is distributed in nano-silicon core
Around, carbon coating layer is coated on outside amorphous silica matrix.
Preferably, the weight content of the conductive black is 1%-3%, and the thickness of carbon coating layer is 1nm-100nm.
A kind of lithium ion battery that the present invention also proposes is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1, nano silica fume is added in aqueous slkali, add in conductive black and is uniformly dispersed to obtain intermediate material；
S2, carbon source is added in intermediate material, is spray-dried after stirring, is then sintered under the protection of inert gas
Obtain the modified silicon based anode material.
Preferably, in S1, the molar ratio of the nano silica fume and alkali is 1：1-4：1.
Preferably, in S1, a concentration of 0.1mol/L-1mol/L of the aqueous slkali；The aqueous slkali for NaOH solution,
The mixture of one or both of KOH solution.
Preferably, in S1, the conductive black is acetylene black, one kind in super-P, Ketjen black, superconduction carbon black
Or a variety of mixture.
Preferably, in S2, the carbon source is citric acid, polyacrylic acid, sucrose, starch, sodium carboxymethylcellulose, carboxylic first
The mixture of one or more of base enclosure glycan, pitch.
Preferably, in S2, during spray drying, the intake air temperature of spray dryer is 150-170 DEG C, is gone out
Draught temperature is 100-120 DEG C.
Preferably, in S2, the inert gas is the mixing of one or more of nitrogen, argon gas, helium, neon
Object.
Preferably, in S2, the temperature of sintering is 700 DEG C -1100 DEG C, and the time of sintering is 1h-6h.
Lithium ion battery of the present invention is modified silicon based anode material, including amorphous silica matrix and multiple receives
Rice silicon core and it is woven into the network package conductive black of nano-silicon core and material with carbon-coated surface layer；The multiple nano-silicon core insertion
Into amorphous silica matrix, nano-silicon core provides higher reversible capacity, conductive black as the active material of storage lithium
Conductive network package nano-silicon core is woven into, improves the electron conduction and ionic conductivity of material, amorphous silica exists
It can be changed into lithium metasilicate/lithium metasilicate/lithia during embedding lithium/de- lithium and provide buffering for the volume expansion of nano-silicon, and
And compared with the sub- silicon of oxidation, the silica substrate content of the material is adjustable, adjustable so as to the coulombic efficiency for the first time of material.This
Outside, the carbon-coating on surface can improve the electron conduction of material, with conductive black collective effect, reduce polarization, improve material
Cyclical stability.This method technique is relatively easy, is easy to mass produce.
Description of the drawings
Fig. 1 is the structure diagram of modified silicon based anode material proposed by the present invention；
Fig. 2 is the electricity of the negative material making of the battery that negative material prepared by the embodiment of the present invention 1 makes and comparative example
The first charge-discharge curve in pond；
Fig. 3 is the electricity of the negative material making of the battery that negative material prepared by the embodiment of the present invention 1 makes and comparative example
The cycle performance figure in pond.
Specific embodiment
In the following, technical scheme of the present invention is described in detail by specific embodiment.
Embodiment 1
Fig. 1 is the structure diagram of modified silicon based anode material proposed by the present invention, with reference to Fig. 1, proposed by the present invention one
Kind of lithium ion battery is modified silicon based anode material, and the modified silicon based anode material includes amorphous silica matrix 1, multiple
Nano-silicon core 2, conductive black 3 and carbon coating layer 4；
Wherein, multiple nano-silicon cores 2 are embedded in amorphous silica matrix 1, and conductive black 3 is distributed in nano-silicon core 2
Around, carbon coating layer 4 is coated on outside amorphous silica matrix 1；
The weight content of conductive black 3 is 1%, and the thickness of carbon coating layer 4 is 100nm.
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1,1g nano silica fumes are added in the NaOH solution of 357ml 0.1mol/L, reacts 10min, add in 0.016g
Super-P, dispersion 10min obtain intermediate material；
S2, in intermediate material add in 0.3g citric acids, be spray-dried after stirring, wherein, spray dryer into
Draught temperature is 150 DEG C, and air outlet temperature is 120 DEG C, is then fed into the tube furnace of nitrogen atmosphere protection, is sintered at 700 DEG C
2h, room temperature discharging can obtain the modified silicon based anode material.
By the modification silicon based anode material of preparation：SP：LA133 presses 8：1：1 weight ratio carries out conjunction slurry, coating, assembling
CR2016 button cells, electrolyte use the EC+DMC solution of 1mol/L LiPF6, and carry out electrochemical property test, fill for the first time
Discharge test is as shown in Fig. 2, cycle performance is as shown in Figure 3；As shown in Figure 2, the modification silicon-based anode which prepares
The initial charge specific capacity of material is 1699mAh/g, and head effects are 84.68%, from the figure 3, it may be seen that modified silicon prepared by the embodiment
The circulating battery that base negative material makes is after 40 weeks, and the initial charge specific capacity of material is 1594.5mAh/g, and capacity retention ratio is
93.8%.
Comparative example
By traditional sub- silicon materials of carbon coating oxidation according to SiO/C：SP：LA133=8：1：1 weight ratio is closed
Slurry, coating assemble CR2016 button cells, and electrolyte uses the EC+DMC solution of 1mol/L LiPF6, and carries out electrochemistry
It can test, first charge-discharge test result is as shown in Fig. 2, cycle performance is as shown in Figure 3；As shown in Figure 2, traditional oxygen in comparative example
The initial charge specific capacity for changing Asia silicon materials is 1435mAh/g, and head effects are 73.96%, from the figure 3, it may be seen that after recycling 40 weeks, material
Initial charge specific capacity for 1140.7mAh/g, capacity retention ratio 79.5%.
Comparing embodiment 1 is modified the battery of silicon based anode material making and the battery for aoxidizing sub- silicon and making that comparative example is traditional
Performance it is found that embodiment 1 is modified the performance for the battery that silicon based anode material makes better than the traditional oxidation Asia silicon system of comparative example
The performance of the battery of work；The reason of its performance difference, is that its silica of the material prepared in embodiment 1 is adjustable, therefore can be with
The coulombic efficiency for the first time of material is adjusted, in addition, conductive black is woven into network, channel is provided, therefore improve for electronics and ion
The electron conduction of material, and surface amorphous carbon layer can not only improve the electric conductivity of material, also and silica substrate
Collective effect has buffered volume expansion.
Embodiment 2
Fig. 1 is the structure diagram of modified silicon based anode material proposed by the present invention, with reference to Fig. 1, proposed by the present invention one
Kind of lithium ion battery is modified silicon based anode material, and the modified silicon based anode material includes amorphous silica matrix 1, multiple
Nano-silicon core 2, conductive black 3 and carbon coating layer 4；
Wherein, multiple nano-silicon cores 2 are embedded in amorphous silica matrix 1, and conductive black 3 is distributed in nano-silicon core 2
Around, carbon coating layer 4 is coated on outside amorphous silica matrix 1；
The weight content of conductive black 3 is 3%, and the thickness of carbon coating layer 4 is 1nm.
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1,1g nano silica fumes are added in the NaOH solution of 89ml 0.1mol/L, reacts 10min, add in 0.05g
Super-P, dispersion 10min obtain intermediate material；
S2, in intermediate material add in 0.03g citric acids, be spray-dried after stirring, wherein, spray dryer into
Draught temperature is 170 DEG C, and air outlet temperature is 100 DEG C, is then fed into the tube furnace of nitrogen atmosphere protection, is sintered at 1100 DEG C
2h, room temperature discharging can obtain modified silicon based anode material.
Embodiment 3
Fig. 1 is the structure diagram of modified silicon based anode material proposed by the present invention, with reference to Fig. 1, proposed by the present invention one
Kind of lithium ion battery is modified silicon based anode material, and the modified silicon based anode material includes amorphous silica matrix 1, multiple
Nano-silicon core 2, conductive black 3 and carbon coating layer 4；
Wherein, multiple nano-silicon cores 2 are embedded in amorphous silica matrix 1, and conductive black 3 is distributed in nano-silicon core 2
Around, carbon coating layer 4 is coated on outside amorphous silica matrix 1；
The weight content of conductive black 3 is 2%, and the thickness of carbon coating layer 4 is 50nm.
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1,1g nano silica fumes are added in the NaOH solution of 200ml 0.1mol/L, reacts 10min, add in 0.33g
Super-P, dispersion 10min obtain intermediate material；
S2,0.15g polyacrylic acid is added in intermediate material, is spray-dried after stirring, 160 DEG C of intake air temperature,
110 DEG C of air outlet temperature is then fed into the tube furnace of nitrogen atmosphere protection, and 1h is sintered at 700 DEG C, and room temperature discharging can obtain
Modified silicon based anode material.
Embodiment 4
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1,1g nano silica fumes are added in the NaOH solution of 35ml 1mol/L, reacts 10min, add in 0.3g Super-
P, dispersion 10min obtain intermediate material；
S2,0.3g carboxymethyl celluloses are added in intermediate material, is spray-dried after stirring, wherein, spray drying
The intake air temperature of machine is 155 DEG C, and air outlet temperature is 112 DEG C, is then fed into the tube furnace of nitrogen atmosphere protection, 1100 DEG C
Lower sintering 1h, room temperature discharging can obtain modified silicon based anode material.
Embodiment 5
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1,1g nano silica fumes are added in the NaOH solution of 8.9ml 1mol/L, reacts 10min, add in 0.3g Super-
P, dispersion 10min obtain intermediate material；
S2, in intermediate material add in 0.3g glucose, be spray-dried after stirring, wherein, spray dryer into
Draught temperature is 167 DEG C, and air outlet temperature is 117 DEG C, is then fed into the tube furnace of nitrogen atmosphere protection, is sintered at 1100 DEG C
6h, room temperature discharging can obtain modified silicon based anode material.
Embodiment 6
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1,1g nano silica fumes are added in the NaOH solution of 25ml 1mol/L, reacts 10min, add in 0.3g Super-
P, dispersion 10min obtain intermediate material；
S2,0.3g carboxymethyl chitosans are added in intermediate material, is spray-dried after stirring, wherein, spray drying
The intake air temperature of machine is 160 DEG C, and air outlet temperature is 115 DEG C, is then fed into the tube furnace of nitrogen atmosphere protection, 700 DEG C
Lower sintering 6h, room temperature discharging can obtain modified silicon based anode material.
Embodiment 7
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1, nano silica fume is added in aqueous slkali, add in conductive black and is uniformly dispersed to obtain intermediate material；
S2, carbon source is added in intermediate material, is spray-dried after stirring, is then sintered under the protection of inert gas
Obtain the modified silicon based anode material.
Embodiment 8
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1, nano silica fume is added in NaOH solution, add in conductive black and is uniformly dispersed to obtain intermediate material；Wherein,
The molar ratio of the nano silica fume and sodium hydroxide is 1：1；A concentration of 1mol/L of the NaOH solution；The conductive black is
The mixture of Ketjen black, superconduction carbon black, and the weight ratio of Ketjen black, superconduction carbon black is 3：1；
S2, citric acid is added in intermediate material, is spray-dried after stirring, then burnt under the protection of inert gas
Knot obtains the modified silicon based anode material；Wherein, during spray drying, the intake air temperature of spray dryer is
150 DEG C, air outlet temperature is 120 DEG C；The inert gas is argon gas；In sintering process, the temperature of sintering is 1100 DEG C, is burnt
The time of knot is 1h.
Embodiment 9
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1, nano silica fume is added in KOH solution, add in acetylene black and is uniformly dispersed to obtain intermediate material；Wherein, it is described
The molar ratio of nano silica fume and potassium hydroxide is 4：1；A concentration of 0.1mol/L of the KOH solution；
S2, sucrose is added in intermediate material, is spray-dried after stirring, is then sintered under the protection of inert gas
Obtain the modified silicon based anode material；Wherein, during spray drying, the intake air temperature of spray dryer is 170
DEG C, air outlet temperature is 100 DEG C；The inert gas is helium, the mixture of neon, and the volume ratio of helium, neon is 3：
2；In sintering process, the temperature of sintering is 700 DEG C, and the time of sintering is 6h.
Embodiment 10
A kind of lithium ion battery proposed by the present invention is modified the preparation method of silicon based anode material, including following step
Suddenly：
S1, nano silica fume is added in aqueous slkali, add in conductive black and is uniformly dispersed to obtain intermediate material；Wherein, institute
The molar ratio for stating nano silica fume and alkali is 2：1；A concentration of 0.5mol/L of the aqueous slkali；The aqueous slkali for NaOH solution,
The mixture of KOH solution, and NaOH solution, the volume ratio of KOH solution are 2：1；The conductive black for acetylene black, super-P,
The mixture of Ketjen black, superconduction carbon black, and the weight ratio of acetylene black, super-P, Ketjen black, superconduction carbon black is 4：2：3：
1；
S2, carbon source is added in intermediate material, is spray-dried after stirring, is then sintered under the protection of inert gas
Obtain the modified silicon based anode material；Wherein, the carbon source be polyacrylic acid, starch, sodium carboxymethylcellulose, pitch it is mixed
Object is closed, and the weight ratio of polyacrylic acid, starch, sodium carboxymethylcellulose, pitch is 5：3：2：4；During spray drying,
The intake air temperature of spray dryer is 160 DEG C, and air outlet temperature is 110 DEG C；The inert gas is the mixing of nitrogen, argon gas
Object, and the volume ratio of nitrogen, argon gas is 3：2；In sintering process, the temperature of sintering is 800 DEG C, and the time of sintering is 3h.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of lithium ion battery is modified silicon based anode material, which is characterized in that the modified silicon based anode material is included without fixed
Type silica substrate (1), multiple nano-silicon cores (2), conductive black (3) and carbon coating layer (4)；
Wherein, in the embedded amorphous silica matrix (1) of multiple nano-silicon cores (2), conductive black (3) is distributed in nano-silicon core
(2) around, carbon coating layer (4) is coated on amorphous silica matrix (1) outside.
2. lithium ion battery is modified silicon based anode material according to claim 1, which is characterized in that the weight of conductive black (3)
Amount content is 1%-3%, and the thickness of carbon coating layer (4) is 1nm-100nm.
3. a kind of lithium ion battery as claimed in claim 1 or 2 is modified the preparation method of silicon based anode material, which is characterized in that
Include the following steps：
S1, nano silica fume is added in aqueous slkali, add in conductive black and is uniformly dispersed to obtain intermediate material；
S2, carbon source is added in intermediate material, is spray-dried after stirring, then be sintered to obtain under the protection of inert gas
The modified silicon based anode material.
4. lithium ion battery is modified the preparation method of silicon based anode material according to claim 3, which is characterized in that in S1
In, the molar ratio of the nano silica fume and alkali is 1：1-4：1.
5. the preparation method of silicon based anode material is modified according to the lithium ion battery of claim 3 or 4, which is characterized in that
In S1, a concentration of 0.1mol/L-1mol/L of the aqueous slkali；The aqueous slkali for NaOH solution, one kind in KOH solution or
Two kinds of mixture.
6. the preparation method of silicon based anode material, feature are modified according to any one of the claim 3-5 lithium ion batteries
It is, in S1, the conductive black is one or more of acetylene black, super-P, Ketjen black, superconduction carbon black
Mixture.
7. the preparation method of silicon based anode material, feature are modified according to any one of the claim 3-6 lithium ion batteries
Be, in S2, the carbon source for citric acid, polyacrylic acid, sucrose, starch, sodium carboxymethylcellulose, carboxymethyl chitosan,
The mixture of one or more of pitch.
8. the preparation method of silicon based anode material, feature are modified according to any one of the claim 3-7 lithium ion batteries
It is, in S2, during spray drying, the intake air temperature of spray dryer is 150-170 DEG C, and air outlet temperature is
100-120℃。
9. the preparation method of silicon based anode material, feature are modified according to any one of the claim 3-8 lithium ion batteries
It is, in S2, the inert gas is the mixture of one or more of nitrogen, argon gas, helium, neon.
10. the preparation method of silicon based anode material, feature are modified according to any one of the claim 3-9 lithium ion batteries
It is, in S2, the temperature of sintering is 700 DEG C -1100 DEG C, and the time of sintering is 1h-6h.
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| CN111564611A (en) * | 2020-04-07 | 2020-08-21 | 河南电池研究院有限公司 | Silicon-oxygen-carbon composite material, preparation method and lithium battery material |
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