CN103579589A - Graphene-silicon-graphene composite material, preparation method of graphene-silicon-graphene composite material, lithium ion battery and preparation method of lithium ion battery - Google Patents
Graphene-silicon-graphene composite material, preparation method of graphene-silicon-graphene composite material, lithium ion battery and preparation method of lithium ion battery Download PDFInfo
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Abstract
The invention relates a graphene-silicon-graphene composite material and its preparation method and use. The preparation method of the graphene-silicon-graphene composite material directly utilizes a gaseous carbon source and a gaseous silicon source as raw materials and the graphene-silicon-graphene composite material is prepared by alternate feeding of the gaseous carbon source and the gaseous silicon source through a chemical vapor deposition method. The preparation method of the graphene-silicon-graphene composite material has low equipment requirements, can be operated simply, can be controlled easily, has short operation time, can effectively improve production efficiency, directly utilizes the gaseous carbon source and the gaseous silicon source as the raw materials, does not produce impurities, produces gaseous by-products which can be directly discharged, produces high-purity products, avoids complex purification processes, prevents a product loss and realizes a high yield.
Description
Technical field
The present invention relates to lithium ion battery field, relate in particular to a kind of Graphene-silicon-graphene composite material, its preparation method, lithium ion battery and preparation method thereof.
Background technology
Along with social development, the requirement of energy storage technology and energy storage device is more and more higher, and lithium ion battery is wherein a kind of.For the energy-storage property of lithium ion battery, negative material plays an important role.The negative material of tradition lithium ion battery is mainly graphite, and the theoretical capacity of graphite is only up to 372mAh/g, thereby has greatly limited the performance of lithium ion battery, cannot meet the demand of people to high power capacity device.Silicon has caused people's extensive concern with high-energy-density (4200mAh/g).Although silicon has the advantage of high power capacity as negative material, but its change in volume in the process of embedding lithium and de-lithium is larger, the highest cubical expansivity reaches 300%, cyclical stability is poor, cause electrode material powdered, the inner forfeiture of active material electrically contacts, and electrode capacity is decayed rapidly, thereby shortens the life-span of lithium ion battery.Graphene is a kind of two-dimentional monolayer material, has excellent flexibility.Silicon materials and Graphene carry out compound can effectively reduce silicon materials expand and contraction process in destruction to electrode material, thereby the cycle performance of raising device.Silicon and the Graphene of tradition report carry out the compound three-decker that often adopts, intermediate layer is silicon, both sides are two-layer is Graphene, and the flexibility that can make full use of like this Graphene reduces the powdered of electrode material in silicon expansion and contraction process, thereby improves to a great extent cycle performance.But traditional Graphene-silicon-Graphene 3-layer composite material preparation process generally adopts solwution method, as anhydrous silicon tetrachloride, surfactant, naphthalene sodium and graphite oxide are dispersed in oxolane, slowly after temperature reaction, filter to isolate product, again by correspondingly separation and purification process washed product until can't detect raw material and accessory substance, final drying slowly intensification heat treatment a period of time obtains Graphene-silicon-graphene composite material in argon atmosphere, preparation process is complicated, need multistep to purify and clean, product purity also can be influenced.
Summary of the invention
Based on this, be necessary to provide Graphene-silicon-graphene composite material that a kind of preparation technology is relatively simple, product purity is higher and preparation method thereof.
A preparation method for Graphene-silicon-graphene composite material, comprises the steps:
Substrate is placed in to vacuum reaction chamber, in described reative cell, passes into protective gas until reaction finishes, vacuumize subsequently, at 500 ~ 1300 ℃, substrate is carried out heat treated and keeps temperature-resistant subsequently;
Stop vacuumizing, in described reative cell, pass into gaseous carbon source;
Stop passing into described gaseous carbon source, in described reative cell, pass into gaseous state silicon source;
Stop passing into described gaseous state silicon source, again in described reative cell, pass into gaseous carbon source;
Stop, to substrate heating, stopping passing into described gaseous carbon source, continue to pass into protective gas to substrate and be cooled to room temperature, at substrate surface, obtain Graphene-silicon-graphene composite material.
In an embodiment, described protective gas is nitrogen or inert gas therein; The flow that passes into of described protective gas is 50 ~ 300mL/ minute.
In an embodiment, described gaseous carbon source is methane, ethene or acetylene therein; The flow that passes into of described gaseous carbon source is 50 ~ 300mL/ minute.
In an embodiment, described gaseous state silicon source is silicon tetrahydride therein; The flow that passes in described gaseous state silicon source is 50 ~ 300mL/ minute.
-silicon-graphene composite material, described composite material is to prepare according to the preparation method of above-mentioned Graphene-silicon-graphene composite material.
In addition, be also necessary to provide a kind of lithium ion battery that uses this Graphene-silicon-graphene composite material and preparation method thereof.
, comprising positive pole, described positive pole comprises collector and is coated in the positive electrode on described collector, described positive electrode comprises conductive agent, binding agent and positive electrode active materials; Wherein, described positive electrode active materials is Graphene-silicon-graphene composite material claimed in claim 5.
A preparation method for lithium ion battery, comprises the steps:
The ratio that is 80 ~ 85:5 ~ 10:5 ~ 10 according to mass ratio, mixes above-mentioned Graphene-silicon-graphene composite material with binding agent and conductive agent, obtain positive electrode;
Described positive electrode is coated on Copper Foil, after drying, slicing treatment, obtains positive plate;
Using lithium sheet as negative plate, described lithium sheet, barrier film, described positive plate are assembled into battery core;
Described battery core is encapsulated in battery container, and injects electrolyte in described battery container, after sealing, obtain lithium ion battery.
In an embodiment, described binding agent is Kynoar therein.
In an embodiment, described conductive agent is acetylene black therein.
In an embodiment, the electrolyte in described electrolyte is LiPF therein
6, LiBF
4, LiTFSI or LiFSI, the solvent in described electrolyte is dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate or acetonitrile, the concentration of described electrolyte in described electrolyte is 1mol/L.
It is raw material that above-mentioned Graphene-silicon-graphene composite material directly be take gaseous carbon source and gaseous state silicon source, utilize chemical vapour deposition technique to be alternately filled with gaseous carbon source and Graphene-silicon-graphene composite material is prepared in gaseous state silicon source, low for equipment requirements, easy control easy and simple to handle, consuming time short, can effectively enhance productivity.And directly take gaseous carbon source and gaseous state silicon source is raw material, free from admixture, the accessory substance of reaction is gaseous state, can directly get rid of, and the purity of product is high, without carrying out complicated purification step, avoids product loss, and the productive rate of product is also higher.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of the Graphene-silicon-graphene composite material of an execution mode;
Fig. 2 is the preparation flow figure of the lithium ion battery of an execution mode.
Embodiment
Mainly in conjunction with the drawings and the specific embodiments Graphene-silicon-graphene composite material and preparation method thereof, lithium ion battery and preparation method thereof are described in further detail below.
Graphene-silicon-the graphene composite material of present embodiment has the molecular structure of three layers, comprises two-layer graphene layer and the elementary silicon layer between this two-layer graphene layer.The layer structure that Graphene and silicon build makes together with Graphene can not reunite in electrochemical reaction process with silicon, the active surface area of increase silicon; And this composite material has good conductivity and duct, be conducive to the diffusion of the transportation of electronics in electrode process and lithium ion, make this composite material there is good power-performance.The layer structure that Graphene builds can effectively cushion the volumetric expansion of silicon in charge and discharge process, improves the cycle performance of silicon.
As shown in Figure 1, the preparation method of the Graphene-silicon-graphene composite material of present embodiment comprises the steps:
Step S110, is placed in vacuum reaction chamber by substrate, in described reative cell, passes into protective gas until reaction finishes, and vacuumizes subsequently, at 500 ~ 1300 ℃, substrate is carried out heat treated and keeps temperature-resistant subsequently.
Substrate can be common metal or alloy substrate etc.
In the present embodiment, can use successively mechanical pump, lobe pump and molecular pump step by step the vacuum degree of reative cell to be evacuated to 10
-3following so that the reative cell of Pa is in oxygen-free environment.In other embodiments, can also in the reative cell after vacuumizing, pass into protective gas, and keep 1 ~ 30 minute, further to get rid of the oxygen in reative cell; Or adopt when vacuumizing and pass into protective gas in reative cell, to discharge as early as possible the air in reative cell.Protective gas can be nitrogen or inert gas etc.
Step S 120, stop vacuumizing, and in reative cell, pass into gaseous carbon source, keep temperature-resistant, react after 1 ~ 300 minute and obtain graphene layer on substrate.
Passing into gaseous carbon source in reative cell when, protective gas is also passing into always, and protective gas until final reaction finish.By chemical gaseous phase depositing process, at high temperature there is decomposition reaction in gaseous carbon source, and Formed is deposited on substrate, obtains graphene layer.Protective gas can be nitrogen or inert gas etc.Gaseous carbon source can be methane, ethene or acetylene etc.In the present embodiment, the flow that passes into of gaseous carbon source is 50 ~ 300mL/ minute, and the flow that passes into of protective gas is 50 ~ 300mL/ minute.
Step S130, stops passing into gaseous carbon source, keeps temperature-resistant, in reative cell, passes into protective gas and gaseous state silicon source, reacts after 1 ~ 300 minute and on graphene layer, generates silicon layer, obtains Graphene silicon composite.
The preferred silicon tetrahydride gas in gaseous state silicon source, flow is 50 ~ 300mL/ minute; Protective gas is the same, can be nitrogen or inert gas etc., and to pass into flow be 50 ~ 300mL/ minute.By chemical gaseous phase depositing process, at high temperature there is decomposition reaction in gaseous state silicon source, generates elementary silicon, is deposited on the graphene layer of step S130 generation, obtains Graphene silicon composite.This Graphene silicon composite has double-deck molecular structure, comprises graphene layer and is positioned at the silicon layer on graphene layer.
Step S140, stops passing into gaseous state silicon source, keeps temperature-resistant, in reative cell, passes into protective gas and gaseous carbon source, reacts after 1 ~ 300 minute and on silicon layer, generates graphene layer, at substrate surface, obtains Graphene-silicon-graphene composite material.
Gaseous carbon source can be methane, ethene or acetylene etc.Protective gas can be nitrogen or inert gas etc.The flow that passes into of gaseous carbon source is 50 ~ 300mL/ minute, and the flow that passes into of protective gas is 50 ~ 300mL/ minute.By chemical gaseous phase depositing process, at high temperature there is decomposition reaction in gaseous carbon source, and Formed is deposited on the elementary silicon layer of step S140 generation, obtains Graphene-silicon-graphene composite material.This Graphene-silicon-graphene composite material has the molecular structure of three layers, comprises two-layer graphene layer and the elementary silicon layer between this two-layer graphene layer.The layer structure that Graphene builds can effectively cushion the volumetric expansion of silicon in charge and discharge process, improves the cycle performance of silicon.
In addition, present embodiment provides relatively simple lithium ion battery of a kind of preparation technology and preparation method thereof.The positive pole of this lithium ion battery comprises collector and is coated in the positive electrode on collector, and wherein, positive electrode comprises conductive agent, binding agent and above-mentioned Graphene-silicon-graphene composite material.Graphene-silicon-graphene composite material, as the positive electrode active materials of lithium ion battery, can effectively cushion the volumetric expansion of silicon in charge and discharge process, improves the cycle performance of silicon, thus stability in use and the life-span of improving whole battery.
As shown in Figure 2, the preparation method of this lithium ion battery comprises the steps:
Step S210, prepares Graphene-silicon-graphene composite material according to the preparation method of above-mentioned Graphene-silicon-graphene composite material.
Step S220, the ratio that is 80 ~ 85:5 ~ 10:5 ~ 10 according to mass ratio, mixes Graphene-silicon-graphene composite material with binding agent and conductive agent, obtain positive electrode.
Wherein, binding agent can be Kynoar.Conductive agent can be acetylene black or carbon nano-tube etc.
Step S230, is coated in positive electrode on Copper Foil, after drying, slicing treatment, obtains positive plate.
Step S240, usings lithium sheet as negative plate, and lithium sheet, barrier film, positive plate are assembled into battery core.
Step S250, is encapsulated in battery core in battery container, and injects electrolyte in battery container, obtains lithium ion battery after sealing.
Electrolyte in electrolyte can be LiPF
6, LiBF
4, LiTFSI (LiN (SO
2cF
3)
2) or LiFSI (LiN (SO
2f)
2) etc.; Solvent in electrolyte is dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate or acetonitrile etc.The concentration of electrolyte in electrolyte is 1mol/L.
It is raw material that above-mentioned Graphene-silicon-graphene composite material directly be take gaseous carbon source and gaseous state silicon source, utilize chemical vapour deposition technique to be alternately filled with gaseous carbon source and Graphene-silicon-graphene composite material is prepared in gaseous state silicon source, low for equipment requirements, easy control easy and simple to handle, consuming time short, can effectively enhance productivity.And directly take gaseous carbon source and gaseous state silicon source is raw material, free from admixture, the accessory substance of reaction is gaseous state, can directly get rid of, and the purity of product is high, without carrying out complicated purification step, avoids product loss, and the productive rate of product is also higher.
Be below specific embodiment part:
Embodiment 1
1. substrate is used successively to deionized water, ethanol, acetone ultrasonic cleaning post-drying.
2. substrate is placed in to reative cell, is filled with argon gas, and adopt mechanical pump successively, lobe pump and molecular pump be evacuated to 10 by reative cell step by step
-3below Pa, keep after 30 minutes closure molecule pump.
3. heated substrate, when underlayer temperature reaches 900 ℃, is filled with respectively methane and argon gas to reative cell, and wherein the flow of methane is 300mL/ minute, and the flow of argon gas is 200mL/ minute, keeps temperature-resistant, reacts 240 minutes, generates graphene layer on substrate.
4. stop being filled with methane, keep argon gas to be filled with flow constant, with the flow of 100mL/ minute, be filled with silicon tetrahydride, keep temperature-resistant, react 300 minutes, on graphene layer, generate silicon layer, obtain Graphene silicon composite.
5. stop being filled with silicon tetrahydride, keep argon gas to be filled with flow constant, flow with 300mL/ minute is filled with gaseous methane, keep temperature-resistant, react after 240 minutes, stop heating, and be cooled to room temperature, stop applying argon gas, on silicon layer, generate graphene layer, obtain Graphene-silicon-graphene composite material.
Embodiment 2
1. substrate is used successively to deionized water, ethanol, acetone ultrasonic cleaning post-drying.
2. substrate is placed in to reative cell, is filled with argon gas, and adopt mechanical pump successively, lobe pump and molecular pump be evacuated to 10 by reative cell step by step
-3below Pa, keep after 30 minutes closure molecule pump.
3. heated substrate, when underlayer temperature reaches 1000 ℃, is filled with respectively ethene and argon gas to reative cell, and the flow of therein ethylene is 200mL/ minute, and the flow of argon gas is 200mL/ minute, keeps temperature-resistant, reacts 180 minutes, generates graphene layer on substrate.
4. stop being filled with ethene, keep argon gas to be filled with flow constant, with the flow of 100mL/ minute, be filled with silicon tetrahydride, keep temperature-resistant, react 240 minutes, on graphene layer, generate silicon layer, obtain Graphene silicon composite.
5. stop being filled with silicon tetrahydride, keep argon gas to be filled with flow constant, flow with 200mL/ minute is filled with gaseous ethylene, keep temperature-resistant, react after 180 minutes, stop heating, and be cooled to room temperature, stop applying argon gas, on silicon layer, generate graphene layer, obtain Graphene-silicon-graphene composite material.
Embodiment 3
1. substrate is used successively to deionized water, ethanol, acetone ultrasonic cleaning post-drying.
2. substrate is placed in to reative cell, is filled with argon gas, and adopt mechanical pump successively, lobe pump and molecular pump be evacuated to 10 by reative cell step by step
-3below Pa, keep after 30 minutes closure molecule pump.
3. heated substrate, when underlayer temperature reaches 1100 ℃, is filled with respectively acetylene and argon gas to reative cell, and wherein the flow of acetylene is 100mL/ minute, and the flow of argon gas is 200mL/ minute, keeps temperature-resistant, reacts 120 minutes, generates graphene layer on substrate.
4. stop being filled with acetylene, keep argon gas to be filled with flow constant, with the flow of 100mL/ minute, be filled with silicon tetrahydride, keep temperature-resistant, react 180 minutes, on graphene layer, generate silicon layer, obtain Graphene silicon composite.
5. stop being filled with silicon tetrahydride, keep argon gas to be filled with flow constant, with the flow of 100mL/ minute, be filled with gaseous state acetylene, keep temperature-resistant, react after 120 minutes, stop heating, and be cooled to room temperature, stop applying argon gas, on silicon layer, generate graphene layer, obtain Graphene-silicon-graphene composite material.
Embodiment 4
1. substrate is used successively to deionized water, ethanol, acetone ultrasonic cleaning post-drying.
2. substrate is placed in to reative cell, is filled with nitrogen, and adopt mechanical pump successively, lobe pump and molecular pump be evacuated to 10 by reative cell step by step
-3below Pa, keep after 30 minutes closure molecule pump.
3. heated substrate, when underlayer temperature reaches 1000 ℃, is filled with respectively acetylene and argon gas to reative cell, and wherein the flow of acetylene is 200mL/ minute, and the flow of argon gas is 200mL/ minute, keeps temperature-resistant, reacts 120 minutes, generates graphene layer on substrate.
4. stop being filled with acetylene, keep argon gas to be filled with flow constant, with the flow of 300mL/ minute, be filled with silicon tetrahydride, keep temperature-resistant, react 60 minutes, on graphene layer, generate silicon layer, obtain Graphene silicon composite.
5. stop being filled with silicon tetrahydride, keep argon gas to be filled with flow constant, with the flow of 200mL/ minute, be filled with gaseous state acetylene, keep temperature-resistant, react after 120 minutes, stop heating, and be cooled to room temperature, stop inflated with nitrogen, on silicon layer, generate graphene layer, obtain Graphene-silicon-graphene composite material.
Embodiment 5
1. according to mass ratio 85:5:10, take respectively Graphene-silicon-graphene composite material of preparing in the embodiment 1 of 8.5g, the Kynoar of 0.5g and the acetylene black of 1.0g, obtain positive electrode after mixing;
2. positive electrode is coated on Copper Foil, drying, slicing treatment, obtain positive plate.
3. using lithium sheet as negative plate, by the positive plate making in lithium sheet, barrier film and upper step in order stack of laminations dress up battery core.
4. the battery core making is encapsulated in battery container, then in battery container, injects the LiPF that electrolyte concentration is 1mol/L by the liquid injection port on battery container
6/ dimethyl carbonate electrolyte (represents that electrolyte is LiPF
6, solvent is the electrolyte of dimethyl carbonate), sealing liquid injection port, obtains lithium ion battery.
Embodiment 6
1. according to mass ratio 80:10:10, take respectively Graphene-silicon-graphene composite material of preparing in the embodiment 1 of 8.0g, the Kynoar of 1.0g and the acetylene black of 1.0g, obtain positive electrode after mixing;
2. positive electrode is coated on Copper Foil, drying, slicing treatment, obtain positive plate.
3. using lithium sheet as negative plate, by the positive plate making in lithium sheet, barrier film and upper step in order stack of laminations dress up battery core.
4. the battery core making is encapsulated in battery container, then in battery container, injects the LiBF that electrolyte concentration is 1mol/L by the liquid injection port on battery container
4/ diethyl carbonate electrolyte (represents that electrolyte is LiBF
4, solvent is the electrolyte of diethyl carbonate), sealing liquid injection port, obtains lithium ion battery.
Embodiment 7
1. according to mass ratio 85:10:5, take respectively Graphene-silicon-graphene composite material of preparing in the embodiment 1 of 8.5g, the Kynoar of 1.0g and the acetylene black of 0.5g, obtain positive electrode after mixing;
2. positive electrode is coated on Copper Foil, drying, slicing treatment, obtain positive plate.
3. using lithium sheet as negative plate, by the positive plate making in lithium sheet, barrier film and upper step in order stack of laminations dress up battery core.
4. the battery core making is encapsulated in battery container, by the liquid injection port on battery container, in battery container, inject the LiTFSI/ propene carbonate electrolyte that electrolyte concentration is 1mol/L (representing that electrolyte is that LiTFSI, solvent are the electrolyte of propene carbonate) again, sealing liquid injection port, obtains lithium ion battery.
Embodiment 8
1. according to mass ratio 83:9:8, take respectively Graphene-silicon-graphene composite material of preparing in the embodiment 1 of 8.3g, the Kynoar of 0.9g and the acetylene black of 0.8g, obtain positive electrode after mixing;
2. positive electrode is coated on Copper Foil, drying, slicing treatment, obtain positive plate.
3. using lithium sheet as negative plate, by the positive plate making in lithium sheet, barrier film and upper step in order stack of laminations dress up battery core.
4. the battery core making is encapsulated in battery container, by the liquid injection port on battery container, in battery container, inject LiFSI/ ethylene carbonate/acetonitrile electrolyte that electrolyte concentration is 1mol/L (representing that electrolyte is that LiFSI, solvent are the electrolyte of the mixed solvent formation of ethylene carbonate and acetonitrile) again, sealing liquid injection port, obtains lithium ion battery.
Table 1 encloses for embodiment 5 ~ 8 carries out charge-discharge test the 2nd circle and the 301st under 0.1C electric current the stored energy capacitance obtaining.
Table 1
By upper table 1, can be found out, the capacity that the Graphene-silicon-graphene composite material that adopts this method to prepare obtains is higher, all, more than 1400mAh/g, particularly in circulation 300, encloses rear capability retention all more than 70%, be up to more than 85%, cyclical stability is better.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a preparation method for Graphene-silicon-graphene composite material, is characterized in that, comprises the steps:
Substrate is placed in to vacuum reaction chamber, in described reative cell, passes into protective gas until reaction finishes, vacuumize subsequently, at 500 ~ 1300 ℃, substrate is carried out heat treated and keeps temperature-resistant subsequently;
Stop vacuumizing, in described reative cell, pass into gaseous carbon source;
Stop passing into described gaseous carbon source, in described reative cell, pass into gaseous state silicon source;
Stop passing into described gaseous state silicon source, again in described reative cell, pass into gaseous carbon source;
Stop, to substrate heating, stopping passing into described gaseous carbon source, continue to pass into protective gas to substrate and be cooled to room temperature, at substrate surface, obtain Graphene-silicon-graphene composite material.
2. the preparation method of Graphene-silicon-graphene composite material as claimed in claim 1, is characterized in that, described protective gas is nitrogen or inert gas; The flow that passes into of described protective gas is 50 ~ 300mL/ minute.
3. the preparation method of Graphene-silicon-graphene composite material as claimed in claim 1, is characterized in that, described gaseous carbon source is methane, ethene or acetylene; The flow that passes into of described gaseous carbon source is 50 ~ 300mL/ minute.
4. the preparation method of Graphene-silicon-graphene composite material as claimed in claim 1, is characterized in that, described gaseous state silicon source is silicon tetrahydride; The flow that passes in described gaseous state silicon source is 50 ~ 300mL/ minute.
5. Graphene-silicon-graphene composite material, is characterized in that, described composite material is to prepare according to the preparation method of the Graphene-silicon-graphene composite material as described in any one in claim 1-4.
6. a lithium ion battery, comprises positive pole, and described positive pole comprises collector and be coated in the positive electrode on described collector, and described positive electrode comprises conductive agent, binding agent and positive electrode active materials; It is characterized in that, described positive electrode active materials is Graphene-silicon-graphene composite material claimed in claim 5.
7. a preparation method for lithium ion battery, is characterized in that, comprises the steps:
The ratio that is 80 ~ 85:5 ~ 10:5 ~ 10 according to mass ratio, Graphene-silicon-graphene composite material mixes with binding agent and conductive agent as described in claim 6, obtains positive electrode;
Described positive electrode is coated on Copper Foil, after drying, slicing treatment, obtains positive plate;
Using lithium sheet as negative plate, described lithium sheet, barrier film, described positive plate are assembled into battery core;
Described battery core is encapsulated in battery container, and injects electrolyte in described battery container, after sealing, obtain lithium ion battery.
8. the preparation method of lithium ion battery as claimed in claim 7, is characterized in that, described binding agent is Kynoar.
9. the preparation method of lithium ion battery as claimed in claim 7, is characterized in that, described conductive agent is acetylene black.
10. the preparation method of lithium ion battery as claimed in claim 7, is characterized in that, the electrolyte in described electrolyte is LiPF
6, LiBF
4, LiTFSI or LiFSI, the solvent in described electrolyte is dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate or acetonitrile, the concentration of described electrolyte in described electrolyte is 1mol/L.
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| CN111081981A (en) * | 2019-12-20 | 2020-04-28 | 中国电子科技集团公司第十八研究所 | Preparation method of self-supporting double-sided silicon-graphene composite cathode |
| CN113097487A (en) * | 2021-04-01 | 2021-07-09 | 广东凯金新能源科技股份有限公司 | Silicon-carbon composite material with highly compact structure, and preparation method and application thereof |
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| CN113097487A (en) * | 2021-04-01 | 2021-07-09 | 广东凯金新能源科技股份有限公司 | Silicon-carbon composite material with highly compact structure, and preparation method and application thereof |
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