CN108258227A - Si-C composite material based on silicon substrate molecular sieve structure and preparation method thereof and the lithium ion battery containing the material - Google Patents
Si-C composite material based on silicon substrate molecular sieve structure and preparation method thereof and the lithium ion battery containing the material Download PDFInfo
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- CN108258227A CN108258227A CN201810086951.3A CN201810086951A CN108258227A CN 108258227 A CN108258227 A CN 108258227A CN 201810086951 A CN201810086951 A CN 201810086951A CN 108258227 A CN108258227 A CN 108258227A
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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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- 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 present invention relates to a kind of Si-C composite material based on silicon substrate molecular sieve structure and preparation method thereof and the lithium ion battery containing the material, by being simple substance by the Si reduction of oxidation state in silicon substrate molecular sieve, and carbohydrate or hydro carbons are carbonized in molecular sieve pore passage, form silicon carbon material, the silicon carbon material can be used as the negative material of lithium ion battery, have superior cycle performance.
Description
Technical field
The present invention relates to technical field of lithium ion battery negative, and in particular to a kind of based on silicon substrate molecular sieve structure
Si-C composite material and preparation method thereof and the lithium ion battery containing the material.
Background technology
Lithium ion battery has the performances such as energy density is high, environmental-friendly, cycle performance is excellent and is concerned.With vapour
Turner industry is to the transformation of electric vehicle and the development of small-sized electrochemical cell, the exploitation of high energy density cells and using extremely urgent.
However, the energy density of commercialized graphite cathode is very low at present（Only 372mAh/g）, it is difficult to meet people to electric vehicle
The requirement of course continuation mileage.
Silicon has higher theoretical capacity（4200mAh/g is approximately 10 times of graphite cathode）, thus, silicon is as lithium ion
Battery cathode receives extensively and in-depth study.Unfortunately, although silicon has higher theoretical capacity, since silicon is in itself
Semiconductor, electric conductivity is poor, in charge and discharge process, shows larger volume change（＞ 300%）So that material is with leading
Contact between electric agent, electrolyte deteriorates, and leads to the sharp-decay of capacity.
Researcher has done a large amount of work to improve the electric conductivity of silicon materials, reduces volume of the silicon in charge and discharge process and becomes
Change, to improve the cycle performance of silicium cathode.Such as：The nanosizing of silicon particle（Nano wire, nanotube, porous silicon, hollow silicon, silicon
Film）, Composite（Amorphous carbon, carbon nanotube, graphene, titanium dioxide）, alloying（FeSi、NiSi）, using novel
Conductive agent and electrolysis additive（Self-cure type polymer, conducting polymer）Etc..
Structure porous silicon is one of effective way for alleviating silicon volume change.As patent CN104254490A discloses one kind
Silicon carbon material comprising mesoporous silicon, under the current density of 100mA/g, the reversible capacity of the composite material is about
1400mAh/g；When current density becomes 300mA/g, the reversible capacity of about 1180mAh/g is obtained.It is being recycled by 240
Afterwards, capacity retention ratio 82.8%, so as to obtain the specific capacity of 977mAh/g.
The present invention is under this technical background, and Si-C composite material is carried out to study acquired achievement.
Invention content
The present invention provides a kind of silicon-carbon composite wood based on silicon substrate molecular sieve structure by the research to Si-C composite material
Material and preparation method thereof and the lithium ion battery containing the material, the Si-C composite material have superior cycle performance.
The technical scheme is that：
A kind of Si-C composite material based on silicon substrate molecular sieve structure, using silicon substrate molecular sieve as raw material, by the silicon atom of oxidation state
Elementary silicon is reduced to, and does not destroy the pore passage structure of silicon substrate molecular sieve during reduction reaction（Duct in the present invention includes cage, this hair
Pore passage structure is not destroyed in bright and refers to that spatial position is constant rather than chemical bond is not broken）, silicon substrate molecular sieve pore passage is interior to be distributed
There is carbon simple substance.
Further, the silicon substrate molecular sieve is in pure silicon molecular sieve, Si-Al molecular sieve and Titanium Sieve Molecular Sieve
Any one or a few.More further, the pure silicon molecular sieve is any one or a few in SBA and KIT；
The Si-Al molecular sieve in SAPO, ZSM, MCM, modenite, β-molecular sieve, MOR, SSZ any one or it is several
Kind；The Titanium Sieve Molecular Sieve is any one or a few in TS, TPSO.
Further, the reducing agent silicon atom of oxidation state being reduced to used in elementary silicon is metallic reducing agent, described
Metallic reducing agent is magnesium or aluminium, and the quality of magnesium or aluminium is 0.05-2 times of silicon substrate molecular sieve quality, and reduction reaction is in inert atmosphere
Middle progress, reaction temperature are 500-900 DEG C, and reaction system heating rate is 0.5-3 DEG C/min.
Further, the carbon simple substance being distributed in silicon substrate molecular sieve pore passage is by carbohydrate or hydro carbons carbonization generation.
A kind of preparation method of as above any one of them Si-C composite material, includes the following steps：By silicon substrate molecular sieve
It is uniformly mixed with 0.05-2 times of metallic reducing agent of its quality, the metallic reducing agent is magnesium or aluminium, in indifferent gas after mixing
500-900 DEG C of roasting 0.5-6h is risen to the heating rate of 0.5-3 DEG C/min in atmosphere；Mixture after roasting is cooled down, merging
Hydrogen ion concentration is to stir 2-48h in the acid solution of 0.1-5mol/L；Filtering is rinsed, and obtains the intermediate materials containing elementary silicon；
Intermediate materials containing elementary silicon are scattered in saccharide solution and carbohydrate is made to be carbonized or by the intermediate materials containing elementary silicon
In hydro carbons atmosphere and hydro carbons is made to be carbonized, obtain Si-C composite material.
Further, the saccharide solution is any one or a few in glucose, sucrose and chitosan, saccharide solution
A concentration of 0.1-3mol/L, and wherein carbohydrate Solute mass is 1-10 times of the intermediate materials quality containing elementary silicon, contains silicon
The intermediate materials of simple substance are scattered in by ultrasonic wave in saccharide solution, and are reacted 1-48 hours at 100-250 DEG C, filter, rinse,
It is dry, then in an inert atmosphere, 600-1200 DEG C of carbonization 0.5-12h is warming up to 0.1-10 DEG C/min, it is compound to obtain silicon-carbon
Material.
Further, the hydro carbons atmosphere is methane, ethane and ethylene, and the intermediate materials containing elementary silicon are in hydro carbons atmosphere
In with 0.1-3 DEG C/min be warming up to 300-1200 DEG C carbonization 0.1-2h, obtain Si-C composite material.
A kind of lithium ion battery, negative electrode of lithium ion battery contain as above any one of them Si-C composite material or by such as
Si-C composite material prepared by any one of upper the method.
Further, negative electrode of lithium ion battery preparation method is：In mass ratio 7:2:1 by Si-C composite material, acetylene black
It is mixed with Kynoar, negative electrode slurry is prepared by solvent of N-Methyl pyrrolidone, by slurry even application on metal foil,
Negative plate is obtained after drying, slice.
Advantageous effect：
1st, silicon substrate molecular sieve is during reduction reaction, and silicon oxygen bond fracture, the silicon of oxidation state is reduced to simple substance, only wherein
Oxygen is combined with reducing agent, and the spatial position of silicon atom is held essentially constant, and the duct space of silicon substrate molecular sieve is not destroyed substantially,
Carbon simple substance is distributed in these duct spaces, can increase the electric conductivity of material, and the open structure that sub-sieve has in itself
The volume change in silicon charging process can be improved, the two aspects are so that the silicon carbon material of the present invention has superior cyclicity
Energy；
2nd, the silicon carbon material prepared by the method, can dissolve excessive metallic reducing agent and gold by adding in acid solution
Belong to the oxide of reducing agent generation；For the molecular sieve containing other metallic elements such as aluminium, titanium in silicon substrate molecular sieve, gold therein
Belong to element after silicon is reduced in the form of simple substance or oxide to exist, wherein may have metal simple-substance or the metal oxide sour
Dissolving, shared spatial position are released, and can provide space for the volume change of the silicon in charge and discharge process；Due to silicon substrate
Molecular sieve raw material is in granular form in itself, and in carbonisation, carbon simple substance is not distributed only in duct, is also had point in extra-granular
Cloth.
Description of the drawings
Fig. 1 is the microstructure schematic diagram of silicon carbon material of the present invention（Nanoscale）, figure label 1 is carbon simple substance, and label 2 is
Basic framework（Elementary silicon layer）；
Fig. 2 is the intermediate materials containing elementary silicon prepared in the embodiment of the present invention 3（On）And silicon carbon material（Under）X ray
Diffraction pattern, abscissa are angle of diffraction angle, and ordinate is diffracted intensity；
Fig. 3 is the charging and discharging curve of the multiple charging and discharging of the intermediate materials containing elementary silicon prepared in the embodiment of the present invention 3, horizontal
Coordinate is gram volume（mAh/g）, ordinate is voltage（V）；
Fig. 4 is the charging and discharging curve of the multiple charging and discharging of Si-C composite material prepared in the embodiment of the present invention 3, and abscissa is
Gram volume（mAh/g）, ordinate is voltage（V）.
Specific embodiment
A kind of Si-C composite material based on silicon substrate molecular sieve structure, using silicon substrate molecular sieve as raw material, by the silicon of oxidation state
Atom is reduced to elementary silicon, and does not destroy the pore passage structure of silicon substrate molecular sieve during reduction reaction（Duct in the present invention includes cage,
Pore passage structure is not destroyed in the present invention and refers to that spatial position is constant rather than chemical bond is not broken）, in silicon substrate molecular sieve pore passage
Carbon simple substance is distributed with.
Further, the silicon substrate molecular sieve is in pure silicon molecular sieve, Si-Al molecular sieve and Titanium Sieve Molecular Sieve
Any one or a few.More further, the pure silicon molecular sieve is any one or a few in SBA and KIT；
The Si-Al molecular sieve in SAPO, ZSM, MCM, modenite, β-molecular sieve, MOR, SSZ any one or it is several
Kind；The Titanium Sieve Molecular Sieve is any one or a few in TS, TPSO.
Further, the reducing agent silicon atom of oxidation state being reduced to used in elementary silicon is metallic reducing agent, described
Metallic reducing agent is magnesium or aluminium, and the quality of magnesium or aluminium is 0.05-2 times of silicon substrate molecular sieve quality, and reduction reaction is in inert atmosphere
Middle progress, reaction temperature are 500-900 DEG C, and reaction system heating rate is 0.5-3 DEG C/min.
Further, the carbon simple substance being distributed in silicon substrate molecular sieve pore passage is by carbohydrate or hydro carbons carbonization generation.
A kind of preparation method of as above any one of them Si-C composite material, includes the following steps：By silicon substrate molecular sieve
It is uniformly mixed with 0.05-2 times of metallic reducing agent of its quality, the metallic reducing agent is magnesium or aluminium, in indifferent gas after mixing
500-900 DEG C of roasting 0.5-6h is risen to the heating rate of 0.5-3 DEG C/min in atmosphere；Mixture after roasting is cooled down, merging
Hydrogen ion concentration is to stir 2-48h in the acid solution of 0.1-5mol/L；Filtering is rinsed, and obtains the intermediate materials containing elementary silicon；
Intermediate materials containing elementary silicon are scattered in saccharide solution and carbohydrate is made to be carbonized or by the intermediate materials containing elementary silicon
In hydro carbons atmosphere and hydro carbons is made to be carbonized, obtain Si-C composite material.
Further, the saccharide solution is any one or a few in glucose, sucrose and chitosan, saccharide solution
A concentration of 0.1-3mol/L, and wherein carbohydrate Solute mass is 1-10 times of the intermediate materials quality containing elementary silicon, contains silicon
The intermediate materials of simple substance are scattered in by ultrasonic wave in saccharide solution, and are reacted 1-48 hours at 100-250 DEG C, filter, rinse,
It is dry, then in an inert atmosphere, 600-1200 DEG C of carbonization 0.5-12h is warming up to 0.1-10 DEG C/min, it is compound to obtain silicon-carbon
Material.
Further, the hydro carbons atmosphere is methane, ethane and ethylene, and the intermediate materials containing elementary silicon are in hydro carbons atmosphere
In with 0.1-3 DEG C/min be warming up to 300-1200 DEG C carbonization 0.1-2h, obtain Si-C composite material.
A kind of lithium ion battery, negative electrode of lithium ion battery contain as above any one of them Si-C composite material or by such as
Si-C composite material prepared by any one of upper the method.
Further, negative electrode of lithium ion battery preparation method is：In mass ratio 7:2:1 by Si-C composite material, acetylene black
It is mixed with Kynoar, negative electrode slurry is prepared by solvent of N-Methyl pyrrolidone, by slurry even application on metal foil,
Negative plate is obtained after drying, slice.
Embodiment 1
Mass ratio is SSZ by a kind of preparation method of the Si-C composite material based on silicon substrate molecular sieve structure：Magnesium=1：1.6 ratio
Mg is uniformly mixed by example with SSZ, and gained mixture then is risen to 650 with the heating rate of 0.5 DEG C/min in an inert atmosphere
DEG C roasting 3 h；The hydrochloric acid solution that molar concentration is 1 mol/L is configured, above-mentioned material is placed in acid solution（Hydrionic mole
2 times or more for magnesium powder）Middle stirring is for 24 hours；It is washed with deionized, filters and to filtrate pH=7, obtain the intermediate wood containing elementary silicon
Material；Intermediate materials containing elementary silicon are placed in Muffle furnace, 900 DEG C of carbon are warming up to 0.5 DEG C/min under the atmosphere such as ethylene
Change 1 h, obtain Si-C composite material.
Embodiment 2
Mass ratio is SAPO by a kind of preparation method of the Si-C composite material based on silicon substrate molecular sieve structure：Magnesium=1：0.2
Magnesium is uniformly mixed by ratio with SAPO, then rises to gained mixture with the heating rate of 0.5 DEG C/min in an inert atmosphere
900 DEG C of 0.5 h of roasting；The salpeter solution that molar concentration is 0.1 mol/L is configured, above-mentioned material is placed in acid solution（Acid rubs
Your amount is 2 times of magnesium powder）Middle stirring 48h；It is washed with deionized, filters and to filtrate pH=7, obtain the intermediate wood containing elementary silicon
Material；The glucose solution of 3 mol/L is configured, is the intermediate materials containing elementary silicon according to mass ratio：Glucose=1：1 ratio（Its
Middle glucose quality refers to Solute mass in glucose solution）, 4 h of elementary silicon ultrasound are distributed in saccharide solution；Gained is suspended
Liquid reacts 1 h at 250 DEG C in ptfe autoclave；Gained sample is washed with deionized, filters to filtrate pH=7,
40 DEG C of 24 h of drying then in an inert atmosphere, are warming up to 1200 DEG C of carbonization 0.5h with 0.1 DEG C/min, obtain silicon-carbon composite wood
Material.
Embodiment 3
A kind of lithium ion battery, cathode preparation method include the following steps：
Step 1: it is SSZ by mass ratio：Magnesium=1：Magnesium is uniformly mixed by 1.6 ratio with SSZ, then by gained mixture lazy
Property atmosphere in the heating rate of 0.5 DEG C/min rise to 650 DEG C roasting 3 h；It is molten that the hydrochloric acid that molar concentration is 1 mol/L is configured
Above-mentioned material is placed in acid solution by liquid（The mole of acid is 2 times of magnesium powder）Middle stirring is for 24 hours；It is washed with deionized, filters extremely
Filtrate pH=7 obtain the intermediate materials containing elementary silicon；
Step 2: the sucrose solution of 3 mol/L of configuration, is the material containing elementary silicon according to mass ratio：Sucrose=1：1 ratio, will
4 h of elementary silicon ultrasound are distributed in sucrose solution；Gained suspension reacts 5 h at 190 DEG C in ptfe autoclave；
Gained sample is filtered with deionized water to pH=7, and 80 DEG C of 24 h of drying then in an inert atmosphere, are warming up to 1 DEG C/min
800 DEG C of carbonization 3h, obtain Si-C composite material；
Step 3: according to silicon carbon material：Acetylene black：The mass ratio of Kynoar is 7:2:1 ratio mixing, with N- methyl pyrroles
Pyrrolidone is solvent, prepares negative electrode slurry, and by slurry even application on copper foil, is obtained after drying, slice a diameter of
The negative plate of 12 mm；
The lithium ion battery is using lithium piece as to electrode, the assembled battery in glove box；
Electric performance test is carried out on new prestige tester, charging/discharging voltage is 0.05-3 V；It, should when current density is 500 mA/g
The initial discharge capacity and charging capacity of material are respectively 1200 mAh/g and 905 mAh/g；After 500 weeks cycles, electricity
The discharge capacity and charging capacity in pond are respectively 614 mAh/g and 585 mAh/g.
Embodiment 4
Mass ratio is ZSM by a kind of preparation method of the Si-C composite material based on silicon substrate molecular sieve structure：Magnesium=1：2 ratio
Magnesium with ZSM is uniformly mixed, gained mixture is then risen to 500 DEG C with the heating rate of 3 DEG C/min in an inert atmosphere
Roast 6 h；The sulfuric acid solution that molar concentration is 5 mol/L is configured, above-mentioned material is placed in acid solution（The mole of acid is magnesium powder
2 times）2 h of middle stirring；It is filtered with deionized water to pH=7, obtains the material containing elementary silicon；The chitosan of 0.1 mol/L is configured
Solution is the material containing elementary silicon according to mass ratio：Chitosan=1：0.3 h of elementary silicon ultrasound is distributed to shell and gathered by 10 ratio
In sugar juice；Gained suspension reacts 48 h at 100 DEG C in ptfe autoclave；Gained sample deionized water mistake
Filter then in an inert atmosphere, is warming up to 600 DEG C of carbonization 12h with 10 DEG C/min, obtains silicon-carbon to pH=7,120 DEG C of 2 h of drying
Composite material.
There is the generation of Si-C composite material in embodiment 1-4, duct microstructure can refer to Fig. 1, wherein silicon substrate point
The spatial distribution of son sieve does not have to be destroyed substantially, carbon simple substance is distributed in duct, in addition to this, the outside of sieve particle also has
The generation of carburizing reagent, therefore there is also carbon simple substances.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned reality
Example is applied the present invention is described in detail, it for those skilled in the art, still can be to aforementioned each implementation
Technical solution recorded in example modifies or carries out equivalent replacement to which part technical characteristic.All essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of Si-C composite material based on silicon substrate molecular sieve structure, it is characterised in that：Using silicon substrate molecular sieve as raw material, by oxygen
The silicon atom for changing state is reduced to elementary silicon, and do not destroy the pore passage structure of silicon substrate molecular sieve, silicon substrate molecular sieve pores during reduction reaction
Carbon simple substance is distributed in road.
2. a kind of Si-C composite material based on silicon substrate molecular sieve structure as described in claim 1, it is characterised in that：Described
Silicon substrate molecular sieve is any one or a few in pure silicon molecular sieve, Si-Al molecular sieve and Titanium Sieve Molecular Sieve.
3. a kind of Si-C composite material based on silicon substrate molecular sieve structure as claimed in claim 2, it is characterised in that：Described
Pure silicon molecular sieve is any one or a few in SBA and KIT；The Si-Al molecular sieve be selected from SAPO, ZSM,
Any one or a few in MCM, modenite, β-molecular sieve, MOR, SSZ；The Titanium Sieve Molecular Sieve is selected from TS, TPSO
In any one or a few.
4. the Si-C composite material as described in claim 1 based on silicon substrate molecular sieve structure, it is characterised in that：By oxidation state
Silicon atom is reduced to reducing agent used in elementary silicon as metallic reducing agent, and the metallic reducing agent is magnesium or aluminium, magnesium or aluminium
Quality is 0.05-2 times of silicon substrate molecular sieve quality, and reduction reaction carries out in an inert atmosphere, and reaction temperature is 500-900 DEG C,
Reaction system heating rate is 0.5-3 DEG C/min.
5. the Si-C composite material as described in claim 1 based on silicon substrate molecular sieve structure, it is characterised in that：Silicon substrate molecular sieve
The carbon simple substance being distributed in duct is by carbohydrate or hydro carbons carbonization generation.
It is 6. a kind of such as the preparation method of claim 1-5 any one of them Si-C composite materials, it is characterised in that including following
Step：0.05-2 times of metallic reducing agent of silicon substrate molecular sieve and its quality is uniformly mixed, the metallic reducing agent for magnesium or
Aluminium rises to 500-900 DEG C of roasting 0.5-6h after mixing with the heating rate of 0.5-3 DEG C/min in an inert atmosphere；After roasting
Mixture cooling, merging hydrogen ion concentration be 0.1-5mol/L acid solution in stir 2-48h；Filtering is rinsed, and is contained
The intermediate materials of elementary silicon；Intermediate materials containing elementary silicon are scattered in saccharide solution and carbohydrate is made to be carbonized or will contain
There are the intermediate materials of elementary silicon in hydro carbons atmosphere and hydro carbons is made to be carbonized, obtain Si-C composite material.
7. the preparation method of Si-C composite material as claimed in claim 6, it is characterised in that：The saccharide solution is grape
Any one or a few in sugar, sucrose and chitosan, a concentration of 0.1-3mol/L of saccharide solution, and wherein carbohydrate Solute mass
For 1-10 times of the intermediate materials quality containing elementary silicon, it is molten that the intermediate materials containing elementary silicon by ultrasonic wave are scattered in carbohydrate
It in liquid, and is reacted 1-48 hours at 100-250 DEG C, then in an inert atmosphere, 600-1200 is warming up to 0.1-10 DEG C/min
DEG C carbonization 0.5-12h, filtering, rinsing, drying, obtain Si-C composite material.
8. the preparation method of Si-C composite material as claimed in claim 6, it is characterised in that：The hydro carbons atmosphere for methane,
Ethane and ethylene, the intermediate materials containing elementary silicon are warming up to 300-1200 DEG C of carbonization in hydro carbons atmosphere with 0.1-3 DEG C/min
0.1-2h obtains Si-C composite material.
9. a kind of lithium ion battery, negative electrode of lithium ion battery contains such as claim 1-5 any one of them Si-C composite materials
Or the Si-C composite material prepared by such as any one of claim 7-8 the methods.
10. a kind of lithium ion battery as claimed in claim 9, which is characterized in that negative electrode of lithium ion battery preparation method is：It presses
Mass ratio 7:2:1 mixes Si-C composite material, acetylene black and Kynoar, is prepared using N-Methyl pyrrolidone as solvent negative
Pole slurry by slurry even application on metal foil, negative plate is obtained after drying, slice.
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| CN110098395A (en) * | 2019-04-30 | 2019-08-06 | 苏州宇量电池有限公司 | A kind of preparation method of order mesoporous silicon-carbon cathode |
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