CN110518224A - A kind of preparation method of lithium ion battery carbon silicon anode material - Google Patents
A kind of preparation method of lithium ion battery carbon silicon anode material Download PDFInfo
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- CN110518224A CN110518224A CN201910847305.9A CN201910847305A CN110518224A CN 110518224 A CN110518224 A CN 110518224A CN 201910847305 A CN201910847305 A CN 201910847305A CN 110518224 A CN110518224 A CN 110518224A
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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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—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
- H01M4/36—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
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to electrode material technical fields more particularly to a kind of carbon packet silicon and its preparation method and application.The preparation method of carbon packet silicon provided by the invention, comprising the following steps: carbon source, silicon, catalyst and water are mixed, hydro-thermal reaction and carbonization treatment is successively carried out, obtains carbon packet silicon.The raw material sources that the scheme provided by the invention uses are extensive, cheap, and using hydro-thermal reaction, preparation flow is easy, and low energy consumption, pollution-free, are easy to realize industrial production；Regular, epigranular is coated using the carbon packet silicon structure surface that hydro-thermal reaction and carbonization treatment obtain simultaneously；And can realize that the thickness of carbon-coating is controllable, guarantee that silicon face has the good carbon-coating structure of cladding, when can be effectively solved silicon as electrode material, the problem of volume expansion in charge and discharge process, and then improves its chemical property.
Description
Technical field
The present invention relates to electrode material technical fields more particularly to a kind of carbon packet silicon and its preparation method and application.
Background technique
Studies have shown that silicon can be used as lithium ion battery negative material use, theoretical specific capacity is current business carbon
Ten times or so, application prospect is quite wide.But the problems such as silicon is as lithium ion battery negative material, and there are volume expansions, into
And cause its electrochemical cycle stability performance poor.
Currently, the research for silicium cathode material, mainly using nano-silicon, amorphous silicon or construct special construction silicon and
The methods of its composite material containing silicon.Wherein, carbon packet silicon can largely be buffered in the variation of volume in charge and discharge process,
Effect is rebuild in the destruction for reducing SEI film, and therefore, carbon packet silicon is considered as the effective means for improving silicon electrode cyclical stability.It is existing
The preparation method of capable carbon packet silicon mainly includes electrochemical deposition method, laser deposition, pyrolysis method, sol-gal process, direct current
Arc discharge method, chemical vapour deposition technique and chemical corrosion method etc..But there is complicated for operation, energy consumption in above-mentioned preparation method
It is high, at high cost and be difficult to realize industrialized defect or even some and also can cause environmental pollution.
Summary of the invention
The purpose of the present invention is to provide a kind of carbon packet silicon and its preparation method and application, the preparation method of the carbon packet silicon
It is easy to operate, at low cost and environmental-friendly；Utilize the electrochemical cycle stability for the carbon packet silicon that the preparation method is prepared
Property is preferable.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of preparation methods of carbon packet silicon, comprising the following steps:
Carbon source, silicon, catalyst and water are mixed, hydro-thermal reaction and carbonization treatment is successively carried out, obtains carbon packet silicon.
Preferably, the carbon source is one or more of glucose, starch, beta-cyclodextrin and lignin；
The silicon is micron silicon and/or waste material silicon.
Preferably, the catalyst is transition metal, soluble transition metal salt or ferro-silicium；
The ferro-silicium is using iron and silicon as the ferro-silicium of matrix element.
Preferably, the mass ratio of the carbon source, silicon and catalyst is 10:(1~8): (0.1~10)；
Concentration of the carbon source in the reaction solution that the hydro-thermal reaction occurs is 0.1~10mol/L.
Preferably, the temperature of the hydro-thermal reaction is 150~300 DEG C, and the time of the hydro-thermal reaction is 1~12h.
Preferably, the temperature of the carbonization treatment is 500~1000 DEG C, and soaking time is 1~12h.
Preferably, the heating rate for being warming up to the temperature of the carbonization treatment is 5~15 DEG C/min.
The present invention also provides the carbon packet silicon that the preparation method described in above-mentioned technical proposal is prepared, the carbon packet silicon
Carbon layers having thicknesses are 100~500nm.
The present invention also provides carbon packet silicon described in above-mentioned technical proposal in the application for preparing negative electrode of lithium ion battery.
Preferably, the preparation method of the negative electrode of lithium ion battery, comprising the following steps:
The carbon packet silicon, conductive agent, adhesive and water are mixed, negative electrode slurry is obtained；
The negative electrode slurry is coated on copper foil, cathode is obtained；
The mass ratio of the carbon packet silicon, conductive agent and adhesive is 8:1:1.
The present invention provides a kind of preparation methods of carbon packet silicon, comprising the following steps: mixes carbon source, silicon, catalyst and water
It closes, successively carries out hydro-thermal reaction and carbonization treatment, obtain carbon packet silicon.The raw material sources that scheme provided by the invention uses are extensive,
Cheap, using hydro-thermal reaction, preparation flow is easy, and low energy consumption, pollution-free, is easy to realize industrial production；Water is utilized simultaneously
The carbon packet silicon structure surface that thermal response and carbonization treatment obtain coats regular, epigranular；And can realize that the thickness of carbon-coating is controllable,
Guarantee that silicon face has the good carbon-coating structure of cladding, when can be effectively solved silicon as electrode material, in charge and discharge process
Volume expansion the problem of, and then improve its chemical property.
Detailed description of the invention
Fig. 1 is the SEM figure for the carbon packet silicon that embodiment 1 is prepared；
Fig. 2 is the Raman spectrogram (a) and infrared spectrogram (b) for the carbon packet silicon that embodiment 1 is prepared；
Fig. 3 is the C-V figure for the half-cell that carbon packet silicon described in embodiment 1 is prepared；
The cyclic curve and coulombic efficiency figure for the half-cell that Fig. 4 carbon packet silicon described in embodiment 1 and micron silicon are prepared
(a) the high rate performance curve graph (b) for the half-cell being prepared with carbon packet silicon described in embodiment 1 and micron silicon；
Fig. 5 is the AC impedance figure for the half-cell that carbon packet silicon described in embodiment 1 and micron silicon are prepared.
Specific embodiment
The present invention provides a kind of preparation methods of carbon packet silicon, comprising the following steps:
Carbon source, silicon, catalyst and water are mixed, hydro-thermal reaction and carbonization treatment is successively carried out, obtains carbon packet silicon.
In the present invention, if without specified otherwise, the component of all raw materials is commercially available production well known to those skilled in the art
Product.
In the present invention, the carbon source is preferably one of glucose, starch, beta-cyclodextrin, cellulose and lignin
Or it is several；When the carbon source be above-mentioned specific choice in it is two or more when, the present invention does not have the proportion of the specific substance
Any special restriction, is mixed by any proportion；When containing glucose in the carbon source, the glucose is preferred
For one or more of D- (+)-glucose, D- (+)-Dextrose monohydrate and L- (-)-glucose.
In the present invention, the silicon is preferably sub-micron silicon and/or waste material silicon；The source of the waste material silicon is preferably photovoltaic
Industry；The partial size of the sub-micron silicon is preferably 100nm-1000nm, more preferably 300nm-800nm, most preferably 400nmn-
600nm；When the silicon is preferably the mixture of micron silicon and waste material silicon, proportion of the present invention to the micron silicon and waste material silicon
There is no any special restriction, is mixed by any proportion.
In the present invention, the catalyst is preferably transition metal, soluble transition metal salt or silicon alloy；The transition
Metal is preferably iron, cobalt or nickel；The soluble transition metal salt is preferably soluble ferric iron salt, soluble cobalt or soluble nickel
Salt, specifically, Nickelous nitrate hexahydrate, four hydration nickel acetates, Fe(NO3)39H2O, ferric sulfate, cobalt nitrate or cobaltous sulfate；The silicon
Alloy is preferably using transition metal and silicon as the silicon alloy of matrix element, such as Antaciron, silicon nickel alloy.
In the present invention, the mass ratio of the carbon source, silicon and catalyst is preferably 10:(1~8): (0.1~10), it is more excellent
It is selected as 10:(2~6): (2~8), most preferably 10:(4~5): (3~6)；The anti-of the hydro-thermal reaction is occurring for the carbon source
Answering the concentration in system is preferably 0.1~10mol/L, more preferably 0.4~8mol/L, most preferably 0.5~5mol/L.
Mixing no any special restriction of the present invention to the carbon source, silicon, catalyst and water, using art technology
Process known to personnel carries out.
In the present invention, the temperature of the hydro-thermal reaction is preferably 150~300 DEG C, more preferably 190~250 DEG C, optimal
220~230 DEG C are selected as, the time of the hydro-thermal reaction is preferably 1~12h, more preferably 5~10h, most preferably 6~8h；In
In the present invention, the temperature of the hydro-thermal reaction preferably by being risen in 1~6h by room temperature, more preferably by by room temperature 2~
It is risen in 4h.In the present invention, the hydro-thermal reaction preferably carries out under stirring conditions, and the present invention is to the stirring without appointing
What special restriction, is carried out using process well known to those skilled in the art.
In the present invention, the hydro-thermal reaction can make carbon source monomer that polymerization reaction occur and successfully be wrapped in sub-micron silicon
Particle surface forms spheric granules, realizes the controlledly synthesis of carbon packet silicon.
After the completion of the hydro-thermal reaction, the present invention preferably post-processes the product system after hydro-thermal reaction, after described
Processing is preferably separated by solid-liquid separation, the no any special restriction of separation of solid and liquid of the present invention, ripe using those skilled in the art
The process known carries out.
After the completion of the separation of solid and liquid, the solid product after separation of solid and liquid is preferably carried out carbonization treatment by the present invention；It is described
The temperature of carbonization treatment is preferably 500~1000 DEG C, more preferably 600~800 DEG C, most preferably 700~750 DEG C, when heat preservation
Between preferably 1~12h, more preferably 5~10h, most preferably 6~8h；It is warming up to the heating speed of the temperature of the carbonization treatment
Rate is preferably 5~15 DEG C/min, more preferably 8~12 DEG C/min；In the present invention, the carbonization treatment is preferably in nitrogen atmosphere
Lower progress.
After the carbonization treatment, preferably the product after carbonization treatment is post-processed, the post-processing preferably cools down,
The present invention any special restriction no to the cooling is carried out using process well known to those skilled in the art.
In the present invention, after the effect of the carbonization treatment is to the carbon source high molecular polymerization on sub-micron silicon surface layer is wrapped in
Presoma carry out dehydrogenation and deoxidation, to realize carbonization.
The present invention also provides the carbon packet silicon that the preparation method described in above-mentioned technical proposal is prepared, the carbon packet silicon
Carbon layers having thicknesses are preferably 100~500nm, more preferably 100~300nm, most preferably 100~200nm；The grain of the carbon packet silicon
Diameter is preferably 1~2 μm, more preferably 1~1.5 μm, most preferably 1~1.3 μm.
The present invention also provides carbon packet silicon described in above-mentioned technical proposal in the application for preparing negative electrode of lithium ion battery.
In the present invention, the preparation method of the negative electrode of lithium ion battery, preferably includes following steps:
The carbon packet silicon, conductive agent, adhesive and water are mixed, negative electrode slurry is obtained；
The negative electrode slurry is coated on copper foil, cathode is obtained；
The mass ratio of the carbon packet silicon, conductive agent and adhesive is 8:1:1.
The present invention mixes carbon packet silicon, conductive agent, adhesive and water, obtains negative electrode slurry；In the present invention, the conduction
Agent is preferably conductive black；Described adhesive is preferably polyacrylic acid；The mass ratio of the carbon packet silicon, conductive agent and adhesive is excellent
It is selected as 8:1:1；The present invention does not have any special restriction to the dosage of the water, and the viscosity of the negative electrode slurry enabled to is full
Foot routine lithium battery slurry standard.In the present invention, the mixing preferably carries out under stirring conditions, the stirring
Time is preferably 6~12h, more preferably 8~10h；The present invention does not have any special restriction to the rate of the stirring, uses
Stirring rate well known to those skilled in the art is stirred.It is any special that the present invention does not have the mixed sequence
It limits, is mixed using order by merging well known to those skilled in the art.
After obtaining negative electrode slurry, the negative electrode slurry is coated on copper foil by the present invention, obtains cathode；The present invention is to described
Copper foil does not have any special restriction, using copper foil well known to those skilled in the art；The present invention does not have the coating
Any special restriction, is coated using process well known to those skilled in the art；In the present invention, described to coat
To the thickness of film layer be preferably 50~300 μm, more preferably 100~250 μm, most preferably 150~200 μm；Coating is completed
Afterwards, the present invention is preferably dried in vacuo the product after coating, and the vacuum drying temperature is preferably 50~110 DEG C, more
Preferably 80~100 DEG C；The vacuum drying time is preferably 6~48h, more preferably 15~40h, most preferably 25~
30h。
Carbon packet silicon provided by the invention and its preparation method and application is described in detail below with reference to embodiment, but
It is that they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Silicon: photovoltaic industry waste material silicon；Carbon source: glucose；Catalyst is Nickelous nitrate hexahydrate；
By the mixing of 10g glucose, 4g photovoltaic industry waste material silicon, 2g Nickelous nitrate hexahydrate and 50mL water, (glucose is being mixed
Concentration in liquid is 0.5mol/L), hydro-thermal reaction (be warming up to 190 DEG C in 30min, and keep the temperature 6h) is carried out under agitation,
Separation of solid and liquid obtains solid product, and the solid product is carried out carbonization treatment (nitrogen atmosphere, with the heating rate of 10 DEG C/min
1000 DEG C are warming up to, 1h is kept the temperature), natural cooling obtains carbon packet silicon (partial size is 1.2 μm, carbon layers having thicknesses 250nm).
The carbon packet silicon is subjected to SEM test, test results are shown in figure 1, as shown in Figure 1 carbon source high polymer layer
Package is realized to sub-micron silicon, and forms spheric granules；
The carbon packet silicon is subjected to Raman spectrum test and examination of infrared spectrum, test results are shown in figure 2, and wherein a is
The Raman spectrogram of the carbon packet silicon, b are the infrared spectrogram of the carbon packet silicon, there is the characteristic peak of Si-C key as shown in Figure 2,
Illustrate successfully to be chemically bonded between Si and C, and after carbonization treatment, has observed the apparent carbon material characteristic peak (peak D
With the peak G).
Embodiment 2
Silicon: micron silicon；Carbon source: glucose；Catalyst is iron powder；
10g glucose, 5g micron silicon, 1g iron powder and 50mL water mixes to (concentration of the glucose in mixed liquor is
0.4mol/L), hydro-thermal reaction (be warming up to 300 DEG C in 30min, and keep the temperature 1h) is carried out under agitation, separation of solid and liquid obtains
Solid product, by the solid product carry out carbonization treatment (nitrogen atmosphere is warming up to 700 DEG C with the heating rate of 5 DEG C/min,
Keep the temperature 4h), natural cooling obtains carbon packet silicon (partial size is 1.8 μm, carbon layers having thicknesses 500nm).
Embodiment 3
Silicon: micron silicon；Carbon source: glucose；Catalyst is four hydration nickel acetates；
By 10g glucose, 5g micron silicon, the hydration nickel acetate of 2g tetra- and the mixing of 50mL water, (glucose is dense in mixed liquor
Degree is 10mol/L), hydro-thermal reaction (be warming up to 150 DEG C in 30min, and keep the temperature 12h) is carried out under agitation, is separated by solid-liquid separation
Solid product is obtained, the solid product is carried out carbonization treatment, and (nitrogen atmosphere is warming up to the heating rate of 10 DEG C/min
500 DEG C, keep the temperature 12h), natural cooling obtains carbon packet silicon (partial size is 1.3 μm, carbon layers having thicknesses 400nm).
Test case
By carbon packet silicon described in embodiment 1 and micron silicon powder (partial size is 500~1000nm) and conductive black, polyacrylic acid
It is mixed with the mass ratio of 8:1:1, the water of 50mL is added, stirred 6h, obtain mixed slurry, the mixed slurry is coated in copper foil
On, obtained coating thickness is 200 μm, is dried in vacuo 6h at 100 DEG C, obtains the cathode of lithium ion battery；
In the glove box full of argon gas, installation specification is the coin half cell (electrolyte: in volume ratio of CR 2032
For the vinylene carbonate that 2.0wt% is added in the mixed liquor of the ethylene carbonate of 1:1:1, dimethyl carbonate and diethyl carbonate
Ester；To electrode: metal lithium sheet；Diaphragm: Celgard 2500), 24 hours are stood, the coin shape half that specification is CR 2032 is obtained
Battery；
Electro-chemical test is carried out to the coin half cell that the specification is CR 2032, is 0.01V in test voltage range
~1.2V, current density 420Ag-1Under conditions of carry out constant current charge-discharge test, test results are shown in figure 3, and Fig. 3 is real
The C-V figure for applying the half-cell that carbon packet silicon is prepared described in example 1, obtaining initial discharge specific capacity as shown in Figure 3 is
3210.5mAh/g；
In the case where test voltage range is 0.01V~1.2V, current density 420Ag-1Constant current charge-discharge loop test
With the constant current charge-discharge test carried out under different multiplying, test results are shown in figure 4, and wherein a is carbon packet described in embodiment 1
The cyclic curve and coulombic efficiency figure for the half-cell that silicon and micron silicon are prepared, as at the beginning of a knows half-cell prepared by carbon packet silicon
Beginning specific discharge capacity is 3210.5mAh/g, higher than the specific capacity (3188.1mAh/g) of the half-cell of micron silicon preparation, circulation 100
Coulombic efficiency is close to 100% after circle, and the stability of the half-cell of carbon packet silicon preparation is much better than half electricity of micron silicon preparation
Pond；B is the high rate performance curve graph for the half-cell that carbon packet silicon described in embodiment 1 and micron silicon are prepared, and is known by figure b
The high rate performance stability of charge and discharge under different current densities, the half-cell of carbon packet silicon preparation is substantially better than the multiplying power of micron silicon
Performance；
Under the frequency range of 0.01Hz-100kHz, ac impedance measurement, test knot are carried out under the amplitude condition of 5mV
Fruit is as shown in figure 5, Fig. 5 is the AC impedance figure for the half-cell that carbon packet silicon described in embodiment 1 and micron silicon are prepared, by scheming
5 it is found that the impedance radius of the half-cell of carbon packet silicon preparation shows less than the radius of micron silicon half-cell compared to micron silicon-carbon packet
Silicon has better electric conductivity.
The carbon packet silicon that embodiment 2~3 obtains is subjected to above-mentioned electro-chemical test same as Example 1, test result with
The test result of embodiment 1 is similar, all has preferable electrochemical cycle stability, high rate performance and preferable electric conductivity.
As seen from the above embodiment, the raw material sources that method provided by the invention uses are extensive, cheap, using hydro-thermal
Reaction, preparation flow is easy, and low energy consumption, pollution-free, is easy to realize industrial production；It is obtained simultaneously using hydro-thermal reaction and carbonization treatment
The carbon packet silicon structure surface arrived coats regular, epigranular；And can realize that the thickness of carbon-coating is controllable, guarantee that silicon face has cladding good
Good carbon-coating structure, when can be effectively solved silicon as electrode material, the problem of volume expansion in charge and discharge process, into
And improve its chemical property.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of preparation method of carbon packet silicon, which comprises the following steps:
Carbon source, silicon, catalyst and water are mixed, hydro-thermal reaction and carbonization treatment is successively carried out, obtains carbon packet silicon.
2. preparation method as described in claim 1, which is characterized in that the carbon source is glucose, starch, beta-cyclodextrin, fibre
One or more of dimension element and lignin；
The silicon is sub-micron silicon and/or waste material silicon.
3. preparation method as described in claim 1, which is characterized in that the catalyst is transition metal, soluble transition gold
Belong to salt, iron silicon or silicon alloy；
The silicon alloy is using transition metal and silicon as the silicon alloy of matrix element.
4. preparation method as described in claim 1, which is characterized in that the mass ratio of the carbon source, silicon and catalyst is 10:(1
~8): (0.1~10)；
Concentration of the carbon source in the reaction solution that the hydro-thermal reaction occurs is 0.1~10mol/L.
5. preparation method as described in claim 1 or 4, which is characterized in that the temperature of the hydro-thermal reaction is 150~300 DEG C,
The time of the hydro-thermal reaction is 1~12h.
6. preparation method as described in claim 1, which is characterized in that the temperature of the carbonization treatment is 500~1000 DEG C, is protected
The warm time is 1~12h.
7. preparation method as claimed in claim 6, which is characterized in that be warming up to the heating rate of the temperature of the carbonization treatment
For 5~15 DEG C/min.
8. the carbon packet silicon that the described in any item preparation methods of claim 1~7 are prepared, which is characterized in that the carbon packet silicon
Carbon layers having thicknesses be 100~500nm.
9. carbon packet silicon according to any one of claims 8 is in the application for preparing negative electrode of lithium ion battery.
10. application as claimed in claim 9, which is characterized in that the preparation method of the negative electrode of lithium ion battery, including it is following
Step:
The carbon packet silicon, conductive agent, adhesive and water are mixed, negative electrode slurry is obtained；
The negative electrode slurry is coated on copper foil, cathode is obtained；
The mass ratio of the carbon packet silicon, conductive agent and adhesive is 8:1:1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113707862A (en) * | 2021-08-26 | 2021-11-26 | 厦门大学 | Copper nanowire wound silicon-carbon composite material and preparation method and application thereof |
| CN114014319A (en) * | 2021-11-05 | 2022-02-08 | 厦门大学 | Carbon-coated silicon, preparation method and application thereof, and preparation method of lithium ion battery cathode |
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