CN109546099A - A kind of composite cathode material of silicon/carbon/graphite and preparation method thereof, lithium ion battery - Google Patents
A kind of composite cathode material of silicon/carbon/graphite and preparation method thereof, lithium ion battery 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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention relates to a kind of composite cathode material of silicon/carbon/graphite and preparation method thereof, lithium ion battery, belong to field of lithium ion battery material.The preparation method of composite cathode material of silicon/carbon/graphite of the invention include the following steps: (1) titaniferous, the solution of tin, graphite and nitrogen source reacted to 6 at a temperature of 120~200 DEG C~for 24 hours, be then separated by solid-liquid separation, dry Doped with Titanium/tin graphite composite material；The nitrogen source is one of aniline, thiophene, pyrroles, urea；(2) under carbon-source gas and ammonia gas mixture atmosphere, Doped with Titanium/tin graphite composite material is kept the temperature into 1~3h at a temperature of 400~500 DEG C, 1~3h is then kept the temperature at a temperature of 800~900 DEG C, then cooling composite cathode material of silicon/carbon/graphite.When composite cathode material of silicon/carbon/graphite prepared by the present invention is used for lithium ion battery, it can make lithium ion battery that there is preferable rapid charging performance and cycle performance.
Description
Technical field
The present invention relates to a kind of composite cathode material of silicon/carbon/graphite and preparation method thereof, lithium ion battery, belong to lithium ion battery
Material Field.
Background technique
Demand of the people to pure electric automobile and hybrid vehicle was increasingly good in recent years, the requirement to power battery
It increases accordingly.However current lithium ion battery longer charging time and lower energy density make it that can not fully meet new energy
The needs of source automobile.Therefore the highly desirable power characteristic and energy density for further increasing lithium ion battery of people.Graphite is
The most common negative electrode material of lithium ion battery has high-energy density, low-voltage, good conductivity, resourceful and price
The advantages that cheap.But the layer structure of graphite makes the diffusion rate of lithium ion lower, high rate performance is poor.And quick
Lithium ion easily deposits to form Li dendrite in graphite surface when charging, leads to serious security risk.Currently, being modified to graphite
It is the common method for improving graphite material properties.
A kind of nitrating coated graphite cathode material is disclosed in the Chinese patent application that application publication number is CN104282896A
Material and preparation method thereof.Ionic liquid is evenly coated at the outer surface of graphite by this method, is formed core shell structure, is then carried out
Carbonization obtains nitrating coated graphite negative electrode material.One is disclosed in the Chinese patent application that application publication number is CN104966821A
The preparation method of kind tin nickel doped graphite negative electrode material.Above-mentioned method of modifying does not have an impact the lattice structure of graphite, makes
The rapid charging performance increase rate for obtaining graphite material is limited.
Summary of the invention
The first purpose of this invention is to provide a kind of preparation method of composite cathode material of silicon/carbon/graphite, and this method can mention
The rapid charging performance of high graphite material.
Second object of the present invention is to provide a kind of preparation method preparation using above-mentioned composite cathode material of silicon/carbon/graphite
Composite cathode material of silicon/carbon/graphite.
Third object of the present invention is to provide a kind of lithium ion battery, which includes above-mentioned graphite
Composite negative pole material.The lithium ion battery has faster charging rate, preferable cycle performance.
To achieve the above object, the technical scheme is that
A kind of preparation method of composite cathode material of silicon/carbon/graphite, comprising the following steps:
(1) titaniferous, the solution of tin, graphite and nitrogen source reacted to 6 at a temperature of 120~200 DEG C~for 24 hours, then solid-liquid point
From dry Doped with Titanium/tin graphite composite material；The nitrogen source is one of aniline, thiophene, pyrroles, urea；
(2) under carbon-source gas and ammonia gas mixture atmosphere, by Doped with Titanium/tin graphite composite material in 400~500 DEG C of temperature
Then 1~3h of lower heat preservation keeps the temperature 1~3h at a temperature of 800~900 DEG C, then cooling composite cathode material of silicon/carbon/graphite.
Step (1) titaniferous, tin solution be titaniferous turbid and the mixed solution containing solution of tin, pH value is 8~10.
The titaniferous turbid is dissolved in ethylene glycol solution by butyl titanate and obtains.Wherein in ethylene glycol solution ethylene glycol matter
Measuring concentration is 1~20%, and the ratio between butyl titanate and the amount of ethylene glycol solution are 1~2g:50~100mL.
Described be added in the mixed acid of hydrochloric acid and edta solution containing solution of tin by stannic oxide obtains.Dioxy
Changing the ratio between amount of tin, hydrochloric acid and edta solution is 2~4g:50~100mL:150~300mL.Wherein concentration of hydrochloric acid
It is 36%, the concentration of edta solution is 0.1~0.5g/L.
Nitrogen source described in step (1), graphite mass ratio be 5~10:100.
Graphite used is one of natural graphite, artificial graphite, carbonaceous mesophase spherules in step (1), partial size D50≤
5μm。
Carbon-source gas is one of methane, ethane, acetylene, ethylene in step (2).
The volume ratio of carbon-source gas and ammonia is 5~10:1 in step (2).
Step is cooled to be cooled to room temperature under an inert atmosphere in (2).
Preparation method of the invention by hydro-thermal method by Ti element and Sn element doping in graphite, graphite material can be improved
The interlamellar spacing of material.Simultaneously because Ti element and Sn element doping extend the diffusion admittance of lithium ion in graphite lattice structure,
Reduce the diffusional resistance of lithium ion to improve the diffusion velocity of lithium ion, so as to make the rapid charging performance of lithium ion battery
It improves.
Titanium doped graphite, the graphitization of one side catalytic graphite material, improves the degree of graphitization of material, reduces the knot of material
Brilliant degree and irreversible capacity, and improve the structural stability of material；On the other hand, the titanium carbide that titanium and carbon are formed has metal special
The compound of sign, resistivity is low, is conducive to the raising of material conductivity.Titanium self structure high stability simultaneously, and be easy embedding
Lithium ion out, to improve the diffusion velocity of its material.
Graphite Coating nitrating carbon material in the graphite composite material prepared using preparation method of the invention, clad
Even compact reduces the defect on graphite material surface, effectively prevents the growth of Li dendrite.The doping of nitrogen is so that graphite
For material compares pure carbon material, electronic conductivity with higher.
The technical solution that composite cathode material of silicon/carbon/graphite of the invention is taken are as follows:
A kind of composite cathode material of silicon/carbon/graphite prepared using above-mentioned composite cathode material of silicon/carbon/graphite preparation method.
Above-mentioned composite cathode material of silicon/carbon/graphite electric conductivity with higher.
The technical solution that lithium ion battery of the invention is taken are as follows:
A kind of lithium ion battery, including anode, cathode, electrolyte and diaphragm, cathode include graphite material, and graphite material is
Above-mentioned composite cathode material of silicon/carbon/graphite.
The lithium ion battery has preferable rapid charging performance and cycle performance.
Detailed description of the invention
Fig. 1 is the SEM figure of the composite cathode material of silicon/carbon/graphite of embodiment 2.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
The substances such as the butyl titanate, ethylene glycol, stannic oxide, the hydrochloric acid that are related in following embodiments are commercially available routine
Product.
Embodiment 1
The preparation method of the composite cathode material of silicon/carbon/graphite of the present embodiment, includes the following steps:
(1) 1.5g butyl titanate is dissolved in 80mL ethylene glycol solution (quality of glycol concentration is 10%) and forms titaniferous
Turbid；3g stannic oxide is added to 80mL hydrochloric acid (concentration 36%) and 200mL edta solution (ethylenediamine tetra-acetic acid
Concentration be 0.2g/L) mixed acid in, obtain containing solution of tin；Titaniferous turbid is added to containing in solution of tin later, stirring is equal
After even, the pH value for being passed through ammonia adjustment solution is 9, obtains the solution of titaniferous, tin；The solution of titaniferous, tin is transferred to high pressure later
In reaction kettle, and 8g aniline is added, 100g artificial graphite, and be 180 DEG C of reaction 12h in temperature, filtering, vacuum drying are mixed
Miscellaneous titanium/tin graphite composite material；
(2) Doped with Titanium/tin graphite composite material is transferred in tube furnace after, is passed first into argon gas discharge pipe
Air is passed through methane gas and ammonia gas (volume ratio 8:1) later, and is warming up to 450 DEG C of heat preservation 2h, is warming up to later
850 DEG C of heat preservation 2h stop ventilating methane gas and ammonia gas later, change logical argon gas and Temperature fall to room temperature, obtain stone
Black composite negative pole material.
Embodiment 2
The composite cathode material of silicon/carbon/graphite of the present embodiment is made by the preparation method of embodiment 1.As shown in Figure 1, the present embodiment
Composite cathode material of silicon/carbon/graphite present ball shape structure, partial size is between 5~20 μm.
Embodiment 3
The preparation method of the composite cathode material of silicon/carbon/graphite of the present embodiment, includes the following steps:
(1) 1g butyl titanate is dissolved in 50mL ethylene glycol solution (quality of glycol concentration be 1%) to form titaniferous turbid
Liquid；By 2g stannic oxide be added to 50mL hydrochloric acid (concentration 36%) and 150mL edta solution (ethylenediamine tetra-acetic acid
Concentration is 0.5g/L) mixed acid in, obtain containing solution of tin；Titaniferous turbid is added to containing in solution of tin later, is stirred evenly
Afterwards, the pH value for being passed through ammonia adjustment solution is 10, obtains the solution of titaniferous, tin；It is anti-that the solution of titaniferous, tin is transferred to high pressure later
It answers in kettle, adds 5g pyrroles, 100g artificial graphite, and be 120 DEG C of reaction 12h in temperature, filtering, vacuum drying are adulterated
Titanium/tin graphite composite material；
(2) Doped with Titanium/tin graphite composite material is transferred in tube furnace, is passed first into empty in argon gas discharge pipe
Gas is passed through methane gas and ammonia gas (volume ratio 5:1) later, and is warming up to 400 DEG C of heat preservation 3h, is warming up to 800 later
DEG C heat preservation 3h, stops ventilating methane gas and ammonia gas later, changes logical argon gas and Temperature fall is to room temperature, obtain graphite and answer
Close negative electrode material.
Embodiment 4
The composite cathode material of silicon/carbon/graphite of the present embodiment is made by the preparation method of embodiment 3.
Embodiment 5
The preparation method of the composite cathode material of silicon/carbon/graphite of the present embodiment, includes the following steps:
(1) 2g butyl titanate is dissolved in 100mL ethylene glycol solution (quality of glycol concentration is 20%) and forms titaniferous
Turbid；4g stannic oxide is added to 100mL hydrochloric acid (concentration 36%) and 300mL edta solution (ethylenediamine tetrem
In mixed acid of the concentration of acid for 0.1g/L), obtain containing solution of tin；Titaniferous turbid is added to containing in solution of tin later, is stirred
After uniformly, the pH value for being passed through ammonia adjustment solution is 10, obtains the solution of titaniferous, tin；Titaniferous, solution of tin are transferred to high pressure later
In reaction kettle, add 10g urea, 100g artificial graphite, and temperature be 200 DEG C of reaction 6h, filter, be dried to obtain Doped with Titanium/
Tin graphite composite material；
(2) Doped with Titanium/tin graphite composite material is transferred in tube furnace, is passed first into empty in argon gas discharge pipe
Gas is passed through methane gas and ammonia gas (volume ratio 10:1) later, and is warming up to 500 DEG C of heat preservation 1h, is warming up to 900 later
DEG C heat preservation 1h, stops ventilating methane gas and ammonia gas later, changes logical argon gas and Temperature fall is to room temperature, obtain graphite and answer
Close negative electrode material.
Embodiment 6
The composite cathode material of silicon/carbon/graphite of the present embodiment is made by the preparation method of embodiment 5.
Embodiment 7
The lithium ion battery of the present embodiment is button cell, including anode, cathode, electrolyte and diaphragm, is being flushed with hydrogen gas hand
It is assembled in casing.Just extremely metal lithium sheet, diaphragm are polyethylene and polypropylene composite film, electrolyte LiPF6/EC+DEC(EC
Volume ratio with DEC is 1:1), cathode pole piece is graphite cathode pole piece.
Graphite cathode pole piece be using the composite cathode material of silicon/carbon/graphite of embodiment 2 as negative electrode material, with binder LA132, lead
Electric agent SP and secondary distilled water are mixed into slurry, are then coated on copper foil, obtained by drying, rolling.Wherein graphite is compound
Negative electrode material, LA132, SP, secondary distilled water ratio be 95g:4g:1g:220mL.
Embodiment 8
The cathode pole piece of the present embodiment is using the composite cathode material of silicon/carbon/graphite of embodiment 4 as negative electrode material, according to embodiment 7
Described in graphite cathode pole piece preparation method preparation.
The lithium ion battery of the present embodiment is according to battery preparation method described in embodiment 7, with the cathode pole piece of the present embodiment
It is prepared as cathode.
Embodiment 9
The cathode pole piece of the present embodiment is using the composite cathode material of silicon/carbon/graphite of embodiment 6 as negative electrode material, according to embodiment 7
Described in graphite cathode pole piece preparation method preparation.
The lithium ion battery of the present embodiment is according to battery preparation method described in embodiment 7, with the cathode pole piece of the present embodiment
It is prepared as cathode.
Embodiment 10
The lithium ion battery of the present embodiment is 2Ah soft-package battery, including anode, cathode, electrolyte and diaphragm.Just extremely three
First material LiNi1/3Co1/3Mn1/3O2, electrolyte is the LiPF of 1.3mol/L with concentration6/ EC+DEC (EC is 1 with DEC volume ratio:
1) solution, diaphragm celegard2400.Cathode pole piece be respectively by
Composite cathode material of silicon/carbon/graphite, binder LA132, conductive agent SP and the secondary distilled water of embodiment 2,4 and 6 are mixed into
Slurry is then coated on copper foil, obtained by drying, rolling.Wherein graphite cathode material, LA132, SP, secondary distilled water
Ratio be 95g:4g:1g:220mL.
Battery prepared by cathode pole piece using the composite cathode material of silicon/carbon/graphite of embodiment 2,4 and 6 as negative electrode material point
Biao Ji not be, C2, C3.
Comparative example 1
The artificial graphite that the graphite cathode material of this comparative example uses market to purchase, model FSN-1, manufacturer is river
Xi Zi great mansion Science and Technology Ltd..
Comparative example 2
The cathode pole piece of this comparative example is using the artificial graphite in comparative example 1 as negative electrode material, according to stone described in embodiment 7
Black cathode pole piece preparation method preparation.
The lithium ion battery of this comparative example is according to battery preparation method described in embodiment 7, with the cathode pole piece of this comparative example
For cathode preparation.
Comparative example 3
This comparative example is using the artificial graphite in comparative example 1 as negative electrode material, according to the battery preparation method in embodiment 10,
Soft bag lithium ionic cell is prepared, D is labeled as.
Test example 1
The graphite cathode material of composite cathode material of silicon/carbon/graphite and comparative example 1 to embodiment 2,4 and 6 carries out specific surface area survey
Examination.Test result is as shown in table 1.
1 specific surface area test result of table
| Project | Specific surface area (m2/g) |
| Embodiment 2 | 11.2 |
| Embodiment 4 | 10.9 |
| Embodiment 6 | 10.1 |
| Comparative example 1 | 1.5 |
As shown in Table 1, the graphite material prepared by the present invention forms more hole configurations, and interlamellar spacing becomes larger.
Test example 2
The test of imbibition liquid-keeping property is carried out to the graphite cathode pole piece in embodiment 7~9 and comparative example 2.Test result is such as
Shown in table 2.
The specific test method is as follows for rate of liquid aspiration: in glove box, choosing the cathode pole piece of 1cm*1cm, is inhaled with buret
It takes electrolyte and titrates on pole piece, until electrolyte is terminated when pole piece is without obvious electrolyte, record the time and be electrolysed
The titer of liquid, titer/time are rate of liquid aspiration.
Protecting liquid rate, the specific test method is as follows: calculating theoretical reservoir quantity m1 according to pole piece parameter, then puts pole piece
In the electrolyte for setting theoretical amount m1, the electrolyte m2 for weighing pole piece absorption for 24 hours is placed, liquid rate=(m2/ must be finally protected
M1) * 100%.
2 imbibition liquid-keeping property test result of table
| Project | Rate of liquid aspiration (mL/min) | Protect liquid rate |
| Embodiment 7 | 7.8 | 94.1% |
| Embodiment 8 | 7.6 | 93.3% |
| Embodiment 9 | 7.5 | 93.2% |
| Comparative example 2 | 4.2 | 83.1% |
As shown in Table 2, the imbibition ability of the cathode pole piece prepared by graphite material of the invention is substantially better than in comparative example
Artificial graphite, this is because graphite material of the invention have porous structure and specific surface area it is higher, improve the suction of material
Liquid liquid-keeping property.
Test example 3
Electrical performance testing is carried out to lithium ion battery prepared in embodiment 7~9 and comparative example 2.Electric property is surveyed
Test instrument is the blue electricity CT2001A type cell tester in Wuhan, charging/discharging voltage range 0.005V to 2.0V, and charge-discharge velocity is
0.1C.Test result is as shown in table 3.
3 lithium ion battery electricity performance of table
As shown in Table 3, the lithium ion battery of the invention for using graphite cathode material of the invention as cathode has higher
Discharge capacity for the first time, preferable first charge-discharge efficiency.
Test example 4
The soft-package battery D of soft-package battery C1, C2 and C3 and comparative example 3 to embodiment 10 carry out high rate performance test, survey
Strip part are as follows: charging/discharging voltage 2.75~4.2V of range, 25 ± 3.0 DEG C of temperature, with 0.5C, 1.0C, 5.0C, 10.0C, 2.0C into
Row charging, is discharged with 0.5C.Test result is as described in Table 4.
4 high rate performance test result of table
In practical charging process, the charging time is entered the speed of graphite layers by the interlamellar spacing of graphite, lithium ion, bears
The influence of the factors such as the surface texture of pole material.As shown in Table 4, relative to comparative example, graphite cathode material of the invention is utilized
The cathode pole piece of preparation is preferable as the high rate performance of the soft-package battery of cathode, and in high magnification charging, the charging time is shorter, tool
There is preferable fast charge effect.
Test example 5
Soft-package battery D prepared by soft-package battery C1, C2 and C3 and comparative example 3 to embodiment 10 carries out cycle performance
It can test, test condition are as follows: charging and discharging currents are 2C, 3.0~4.2V of voltage range.Test result is as described in Table 5.
5 cycle performance test result of table
As shown in Table 5, have using cathode pole piece prepared by graphite cathode material of the invention as the soft-package battery of cathode
There is preferable cycle performance, battery capacity conservation rate remains at 98% or more after circulation 200 times.
Claims (10)
1. a kind of preparation method of composite cathode material of silicon/carbon/graphite, characterized by the following steps:
(1) titaniferous, the solution of tin, graphite and nitrogen source reacted to 6 at a temperature of 120~200 DEG C~for 24 hours, it is then separated by solid-liquid separation, does
It is dry to obtain Doped with Titanium/tin graphite composite material；The nitrogen source is one of aniline, thiophene, pyrroles, urea；
(2) under carbon-source gas and ammonia gas mixture atmosphere, Doped with Titanium/tin graphite composite material is protected at a temperature of 400~500 DEG C
Then 1~3h of temperature keeps the temperature 1~3h at a temperature of 800~900 DEG C, then cooling composite cathode material of silicon/carbon/graphite.
2. the preparation method of composite cathode material of silicon/carbon/graphite according to claim 1, it is characterised in that: step (1) is described to be contained
Titanium, tin solution be titaniferous turbid and the mixed solution containing solution of tin.
3. the preparation method of composite cathode material of silicon/carbon/graphite according to claim 2, it is characterised in that: the titaniferous turbid by
Butyl titanate is dissolved in ethylene glycol solution and obtains.
4. the preparation method of composite cathode material of silicon/carbon/graphite according to claim 3, it is characterised in that: the butyl titanate
It is 1~2g:50~100mL with the ratio between the amount of ethylene glycol solution.
5. the preparation method of composite cathode material of silicon/carbon/graphite according to claim 2, it is characterised in that: it is described containing solution of tin by
Stannic oxide, which is added in the mixed acid of hydrochloric acid and edta solution, to be obtained.
6. the preparation method of composite cathode material of silicon/carbon/graphite according to claim 5, it is characterised in that: the stannic oxide,
The ratio between amount of hydrochloric acid and edta solution is 2~4g:50~100mL:150~300mL.
7. the preparation method of composite cathode material of silicon/carbon/graphite according to claim 1, it is characterised in that: described in step (2)
Carbon-source gas is one of methane, ethane, acetylene, ethylene.
8. the preparation method of described in any item composite cathode material of silicon/carbon/graphite according to claim 1~7, it is characterised in that: step
(2) volume ratio of carbon-source gas described in and ammonia is 5~10:1.
9. a kind of composite cathode material of silicon/carbon/graphite, it is characterised in that: composite cathode material of silicon/carbon/graphite graphite as described in claim 1 is compound
The preparation method of negative electrode material is made.
10. a kind of lithium ion battery, including anode, cathode, electrolyte and diaphragm, it is characterised in that: cathode includes graphite material,
Graphite material is composite cathode material of silicon/carbon/graphite described in claim 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111697219A (en) * | 2020-06-30 | 2020-09-22 | 深圳市金牌新能源科技有限责任公司 | Silicon-carbon composite material, preparation method thereof, negative electrode and application thereof |
| CN114068886A (en) * | 2020-07-30 | 2022-02-18 | 湖南中科星城石墨有限公司 | Modified graphite material and preparation method and application thereof |
| CN114122392A (en) * | 2021-11-10 | 2022-03-01 | 云南中晟新材料有限责任公司 | High-capacity quick-charging graphite composite material and preparation method thereof |
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