CN114824234A - Silicon-carbon composite material and preparation method and application thereof - Google Patents

Silicon-carbon composite material and preparation method and application thereof Download PDF

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CN114824234A
CN114824234A CN202210613164.6A CN202210613164A CN114824234A CN 114824234 A CN114824234 A CN 114824234A CN 202210613164 A CN202210613164 A CN 202210613164A CN 114824234 A CN114824234 A CN 114824234A
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silicon
composite material
carbon composite
nano
coupling agent
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罗贺斌
王银水
白丰瑞
罗贺钰
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Fujian Blue Ocean & Black Stone New Material Technology Co ltd
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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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • 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

Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a silicon-carbon composite material and a preparation method and application thereof. The invention provides a preparation method of a silicon-carbon composite material, which comprises the following steps: and mixing the nano-cellulose solution, a silicon source and a coupling agent, and calcining to obtain the silicon-carbon composite material. According to the invention, the nano-cellulose and the silicon source are combined through the coupling agent, so that the nano-cellulose can be tightly wrapped on the surface of the silicon source, and the nano-cellulose is carbonized to generate a carbon fiber layer wrapped on the surface of the silicon-based material in the calcining process, so that the carbon fiber layer can play a good buffering role in the charging and discharging processes, the influence caused by the volume expansion of the silicon-based material is reduced, and the cycle stability of the silicon-carbon composite material is improved.

Description

Silicon-carbon composite material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a silicon-carbon composite material and a preparation method and application thereof.
Background
Lithium ion batteries mainly comprise a positive electrode, an electrolyte and a negative electrode, and mainly rely on lithium ions to move between the positive electrode and the negative electrode to work. During the charge and discharge process, lithium ions are inserted and extracted back and forth between the two electrodes: during charging, lithium ions are extracted from the positive electrode and are inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.
The cathode material is an important component of the lithium ion battery, directly influences the electrochemical performance of the lithium ion battery, and the excellent cathode material can improve the reversible capacity, the rate capability and the cycle performance of the battery. At present, the negative electrode material is mainly graphite, the theoretical specific capacity of the negative electrode material is only 372mAh/g, and the lithium storage capacity is low; compared with the prior art, the silicon-based material has extremely high theoretical specific capacity, and the theoretical specific capacity of silicon is 4200 mAh/g. However, the silicon-based material has low electronic conductivity and undergoes a great volume change during charge and discharge, resulting in pulverization thereof, thereby affecting the cycle performance of the battery.
Chinese patent publication No. CN102891297A discloses a method for preparing a silicon-carbon composite material, which comprises adding graphite, pitch and nano-silicon into an aqueous solution of sodium carboxymethylcellulose, and performing ball milling to obtain a nano-level silicon-carbon composite material precursor; and then carrying out spray drying and carbonization on the precursor to obtain the silicon-carbon composite material. Although the conductivity can be improved by carbon coating, the synthesis process is complex, the structure of a high-molecular polymer is easy to damage in the ball milling process, so that a slurry system is unstable, nano silicon is easy to agglomerate, and excessive local volume expansion and material pulverization occur in the charging and discharging processes, thereby further causing poor cycle performance.
Disclosure of Invention
The invention aims to provide a silicon-carbon composite material, and a preparation method and application thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a preparation method of a silicon-carbon composite material, which comprises the following steps:
and mixing the nano-cellulose solution, a silicon source and a coupling agent, and calcining to obtain the silicon-carbon composite material.
Preferably, the silicon source comprises elemental silicon and/or SiO x (ii) a The value range of x is 0.6-1.4.
Preferably, the coupling agent comprises one or more of a silane coupling agent, a phthalate coupling agent and an aluminate coupling agent.
Preferably, the mass concentration of the nano-cellulose solution is 0.1-50 wt%.
Preferably, the mass ratio of the nanocellulose and the coupling agent in the nanocellulose solution is 100: 1-50;
the mass ratio of the nano-cellulose to the silicon source in the nano-cellulose solution is 1-100: 100.
preferably, the mixing is carried out under stirring; the stirring speed is 500rpm, and the time is 1-10 h.
Preferably, the calcining temperature is 600-1300 ℃, and the heat preservation time is 1-4 h;
the calcination is carried out under a protective atmosphere.
The invention also provides the silicon-carbon composite material prepared by the preparation method in the technical scheme, which is characterized by comprising a silicon-based material and a carbon fiber layer coated on the surface of the silicon-based material.
Preferably, when the silicon source is SiO x When the silicon-based material comprises elemental silicon and silicon dioxide.
The invention also provides the application of the silicon-carbon composite material in the technical scheme in a lithium battery.
The invention provides a preparation method of a silicon-carbon composite material, which comprises the following steps: and mixing the nano-cellulose solution, a silicon source and a coupling agent, and calcining to obtain the silicon-carbon composite material. According to the invention, the nano-cellulose and the silicon source are combined through the coupling agent, so that the nano-cellulose can be tightly wrapped on the surface of the silicon source, and the nano-cellulose is carbonized to generate a carbon fiber layer wrapped on the surface of the silicon-based material in the calcining process, so that the carbon fiber layer can play a good buffering role in the charging and discharging processes, the influence caused by the volume expansion of the silicon-based material is reduced, and the cycle stability of the silicon-carbon composite material is improved.
Drawings
FIG. 1 is a charge-discharge test curve diagram of the composite materials obtained in examples 1-5 and comparative example 1 at 0.1C;
FIG. 2 is a graph showing AC impedance test curves of the composite materials obtained in examples 1 to 4 and comparative example 1.
Detailed Description
The invention provides a preparation method of a silicon-carbon composite material, which comprises the following steps:
and mixing the nano-cellulose solution, a silicon source and a coupling agent, and then calcining to obtain the silicon-carbon composite material.
In the present invention, all the starting materials for the preparation are commercially available products known to those skilled in the art unless otherwise specified.
In the present invention, the silicon source preferably comprises elemental silicon and/or SiO x . In the invention, the value range of x is preferably 0.6-1.4, more preferably 0.7-1.3, and more preferably 0.8-1.2. In the present invention, the elemental silicon preferably includes micro silicon or nano silicon. In the invention, the particle size of the micron silicon is preferably 1-3 μm; the particle size of the nano silicon is preferably 50-200 nm; the SiO x The particle diameter of (A) is preferably 2 to 8 μm.
In the present invention, the coupling agent preferably includes one or more of a silane coupling agent, a phthalate coupling agent, and an aluminate coupling agent. In the present invention, the silane coupling agent is further preferably vinyltrimethoxysilane; the phthalate coupling agent is further preferably monoalkoxy titanate; the aluminate coupling agent is more preferably isopropyl distearoyloxy aluminate.
The present invention is not particularly limited to the kind and source of the nanocellulose in the nanocellulose solution, and those familiar to those skilled in the art can be used. In the present invention, the raw material for preparing the nanocellulose preferably comprises one or more of wood, cotton, beet, flax, bacteria and microcrystalline cellulose. In the present invention, the preparation method of the nanocellulose preferably includes any one of an arc discharge method, a laser ablation method, a fixed bed catalytic cracking method, an acid hydrolysis method and a bacterial synthesis method. The specific implementation process of the preparation method is not particularly limited in the present invention, and the method is well known to those skilled in the art.
In the present invention, the nanocellulose solution is preferably obtained by preparation; the preparation method preferably comprises the following steps:
and mixing the nano-cellulose with water to obtain the nano-cellulose solution.
In the present invention, the water is preferably deionized water. In the present invention, the mixing is preferably performed under stirring; the rotation speed of the stirring is preferably 500 rpm; the time is preferably 20 to 40min, and more preferably 30 min.
In the invention, the mixing temperature is preferably 30-60 ℃, and more preferably 40-50 ℃. In the present invention, the mixing is preferably carried out in a magnetic stirrer with a heating mantle.
In the present invention, the mass concentration of the nanocellulose solution is 0.1 to 50 wt%, more preferably 1 to 45 wt%, and still more preferably 5 to 40 wt%. In the present invention, the mass ratio of the nanocellulose and the coupling agent in the nanocellulose solution is preferably 100: 1 to 50, more preferably 100: 5-45, more preferably 100: 10 to 40. In the invention, the mass ratio of the nano-cellulose to the silicon source in the nano-cellulose solution is preferably 1-100: 100, more preferably 5 to 95: 100, more preferably 10 to 90: 100.
in the present invention, the mixing of the nanocellulose solution, the silicon source and the coupling agent is preferably performed under stirring; the rotation speed of the stirring is preferably 200-800 rpm, more preferably 400-600 rpm, and even more preferably 500 rpm; the time is preferably 1 to 10 hours, more preferably 2 to 9 hours, and still more preferably 3 to 8 hours. In the present invention, the mixing is performed at normal temperature. In the present invention, the order of mixing is preferably: adding the silicon source and coupling agent to the nanocellulose solution. In the present invention, in the above mixing process, the coupling agent and the nanocellulose are coated on the surface of the silicon source.
After the mixing is completed, the present invention preferably further comprises separating and drying the obtained reaction solution. In the present invention, the separation is preferably performed by centrifugation; the rotation speed of the centrifugal separation is preferably 500-5000 rpm, more preferably 1000-4500 rpm, and even more preferably 1500-4000 rpm. The time and the number of times of the centrifugation are not particularly limited in the present invention, and those familiar to those skilled in the art can be used.
In the invention, the drying temperature is preferably 60-120 ℃, more preferably 70-110 ℃, and even more preferably 80-100 ℃. In the present invention, the drying time is not particularly limited as long as a dried product can be obtained. In the present invention, the drying is preferably performed under vacuum conditions.
In the invention, the calcination temperature is preferably 600-1300 ℃, more preferably 700-1200 ℃, and more preferably 800-1000 ℃; the heat preservation time is preferably 1-4 h, more preferably 1.5-3.5 h, and even more preferably 2-3 h; the rate of temperature rise to the calcination temperature is preferably 5 ℃/min. In the present invention, the calcination is preferably carried out in a protective atmosphere; the protective atmosphere is preferably nitrogen or argon. In the present invention, the calcination is carried out in a tube furnace.
After the calcination is completed, the present invention also preferably includes cooling the resulting product. In the present invention, the cooling process is preferably: and reducing the temperature from the calcination temperature to 500 ℃ at a cooling rate of 5 ℃/min, and then naturally cooling to room temperature.
The invention also provides a silicon-carbon composite material prepared by the preparation method in the technical scheme, and the silicon-carbon composite material comprises a silicon-based material and a carbon fiber layer coated on the surface of the silicon-based material.
In the invention, the thickness of the carbon fiber layer is preferably 10-100 nm.
In the present invention, when the silicon source is elemental silicon, the silicon-based material preferably includes elemental silicon. In the invention, when the silicon source is SiO x When used, the silicon-based material preferably includes elemental silicon and silicon dioxide.
The invention also provides the application of the silicon-carbon composite material in the technical scheme in a lithium battery. The present invention is not limited to the specific embodiments of the applications, and the embodiments known to those skilled in the art can be used.
For further illustration of the present invention, the following detailed description of a silicon carbon composite material and its preparation method and application are provided in conjunction with the accompanying drawings and examples, which should not be construed as limiting the scope of the present invention.
Example 1
Taking 3g of nano-cellulose and 100g of deionized water, and stirring at 60 ℃ and a stirring speed of 500rpm for 30min to obtain a nano-cellulose solution;
mixing 10g of SiO x (D50 particle size is 5 μm, wherein x is 0.8) and 0.5g vinyltrimethoxysilane are added into the above nanocellulose solution, and stirred at room temperature at a stirring speed of 500rpm for 3h to mix, then the resulting mixture is centrifuged at 3000rpm, and the resulting precipitate is vacuum dried at 80 ℃;
and placing the dried powder into a tubular furnace, heating to 1000 ℃ at the speed of 5 ℃/min under the nitrogen atmosphere, calcining for 2h, cooling to 500 ℃ at the speed of 5 ℃/min after calcining, and naturally cooling to room temperature to obtain the silicon-carbon composite material.
Example 2
1g of nano-cellulose and 100g of deionized water are taken, and stirred for 30min at the temperature of 60 ℃ and the stirring speed of 500rpm to obtain a nano-cellulose solution;
adding 10g SiOx (D50 with particle size of 5 μm, wherein x is 0.8) and 0.5g vinyltrimethoxysilane into the above nanocellulose solution, stirring at 500rpm for 3h at normal temperature for mixing, centrifuging the obtained mixture at 3000rpm, and vacuum drying the obtained precipitate at 80 deg.C;
and placing the dried powder into a tubular furnace, heating to 1000 ℃ at the speed of 5 ℃/min under the nitrogen atmosphere, calcining for 2h, cooling to 500 ℃ at the speed of 5 ℃/min after calcining, and naturally cooling to room temperature to obtain the silicon-carbon composite material.
Example 3
Stirring 5g of nano-cellulose and 100g of deionized water at 60 ℃ and a stirring speed of 500rpm for 30min to obtain a nano-cellulose solution;
mixing 10g of SiO x (D50 particle diameter is 5 μm, wherein x is 0.8) and 0.5g vinyltrimethoxysilane are added into the nano-cellulose solution, and are stirred for 3h at normal temperature and at the stirring speed of 500rpm to mix, then the obtained mixed solution is centrifugally separated at the rotating speed of 3000rpm, and the obtained precipitate is dried in vacuum at 80 ℃;
and placing the dried powder into a tubular furnace, heating to 1000 ℃ at the speed of 5 ℃/min under the nitrogen atmosphere, calcining for 2h, cooling to 500 ℃ at the speed of 5 ℃/min after calcining, and naturally cooling to room temperature to obtain the silicon-carbon composite material.
Example 4
Taking 3g of nano-cellulose and 100g of deionized water, and stirring at 60 ℃ and a stirring speed of 500rpm for 30min to obtain a nano-cellulose solution;
mixing 10g of SiO x (D50 particle size is 5 μm, wherein x is 0.8) and 0.5g vinyltrimethoxysilane are added into the above nanocellulose solution, and mixed at room temperature with stirring at 500rpm for 0.5h, then the resulting mixture is centrifuged at 3000rpm, and the resulting precipitate is vacuum dried at 80 ℃;
and placing the dried powder into a tubular furnace, heating to 1000 ℃ at the speed of 5 ℃/min under the nitrogen atmosphere, calcining for 2h, cooling to 500 ℃ at the speed of 5 ℃/min after calcining, and naturally cooling to room temperature to obtain the silicon-carbon composite material.
Example 5
Taking 3g of nano-cellulose and 100g of deionized water, and stirring at 60 ℃ and a stirring speed of 500rpm for 30min to obtain a nano-cellulose solution;
mixing 10g of SiO x (D50 particle size is 5 μm, wherein x is 0.8) and 0.5g vinyltrimethoxysilane are added into the above nanocellulose solution, and stirred at room temperature at a stirring speed of 500rpm for 3h to mix, then the resulting mixture is centrifuged at 3000rpm, and the resulting precipitate is vacuum dried at 80 ℃;
and placing the dried powder into a tubular furnace, heating to 700 ℃ at the speed of 5 ℃/min in the nitrogen atmosphere, calcining for 2h, cooling to 500 ℃ at the speed of 5 ℃/min after calcining, and naturally cooling to room temperature to obtain the silicon-carbon composite material.
Comparative example 1
Mixing 10g of SiO x (D50 particle size is 5 μm, wherein x is 0.8), 0.5g vinyl trimethoxy silane is added into 100g deionized water, and stirred at 500rpm for 3h at normal temperature to mix, then the obtained mixture is centrifuged at 3000rpm, and the obtained precipitate is vacuum dried at 80 ℃;
and placing the dried powder into a tubular furnace, heating to 1000 ℃ at the speed of 5 ℃/min under the nitrogen atmosphere, calcining for 2h, cooling to 500 ℃ at the speed of 5 ℃/min after calcining, and naturally cooling to room temperature to obtain the composite material.
Performance testing
Test example 1
The lithium battery is prepared by taking the composite materials obtained in the examples 1-5 and the comparative example 1 as a negative active material, and the preparation process comprises the following steps: the composite, carbon black and polyacrylic acid (PAA) were mixed in 8: 1: 1, adding a proper amount of water, and grinding to obtain an electrode material; then coating the obtained electrode material on a copper foil in a blade coating mode, and performing vacuum drying for 12 hours at 80 ℃ to obtain a battery cathode;
using the obtained battery cathode as a working electrode in a glove boxThe lithium metal sheet is a counter electrode, 1.0M LiPF 6 The electrolyte (wherein the solvent is Ethylene Carbonate (EC), dimethyl carbonate (DMC) and Ethyl Methyl Carbonate (EMC) in equal volume ratio), Celgard 2325 is a diaphragm, and is assembled into a button cell of CR2032 type, and then the assembled cell is subjected to charge-discharge cycle test at 0.1 ℃; the test results are shown in table 1 and fig. 1.
TABLE 1 results of charge-discharge cycle test of the composite materials obtained in examples 1 to 5 and comparative example 1
Figure BDA0003672759250000071
As can be seen from fig. 1 and table 1, the silicon carbon composite material obtained by the present invention has higher first coulombic efficiency and better cycle stability compared to the comparative example.
Test example 2
The lithium battery is prepared by taking the composite materials obtained in the examples 1-5 and the comparative example 1 as a negative active material, and the preparation process comprises the following steps: the composite, carbon black and polyacrylic acid (PAA) were mixed in a ratio of 91: 3: 6, adding a proper amount of water, and grinding to obtain an electrode material; then coating the obtained electrode material on a copper foil in a blade coating mode, and performing vacuum drying for 12 hours at 80 ℃ to obtain a battery cathode;
the obtained battery negative electrode was used as a working electrode, a lithium metal plate was used as a counter electrode, and 1.0M LiPF was used in a glove box 6 Celgard 2325 was a separator, which was an electrolyte solution in which Ethylene Carbonate (EC), dimethyl carbonate (DMC) and Ethyl Methyl Carbonate (EMC) were used in an equal volume ratio, and was co-assembled into a CR2032 type button cell, and then the assembled cell was subjected to an AC impedance test. The test results are shown in Table 2, and the test curves of examples 1 to 4 and comparative example 1 are shown in FIG. 2.
TABLE 2 AC impedance test results of the composites obtained in examples 1 to 5 and comparative example 1
Numbering Impedance/omega of battery
Example 1 25.2
Example 2 26.0
Example 3 25.1
Example 4 25.5
Example 5 24.8
Comparative example 1 51.6
As can be seen from table 2, the silicon-carbon composite material obtained by the present invention has excellent conductivity;
in an alternating current impedance test curve, the arc radius of a high-frequency region represents the diffusion internal resistance of the electrolyte in the electrode material, the larger the arc radius is, the larger the diffusion internal resistance is, and as can be seen from fig. 2, in the high-frequency region, the arc radii of the silicon-carbon composite material obtained by the invention are all smaller than that of comparative example 1, which indicates that the diffusion internal resistances are all smaller than that of comparative example 1; in the low-frequency region, the curves of the embodiments 1 to 4 are closer to the horizontal axis, which shows that the silicon-carbon composite material obtained by the invention has higher conductivity.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.

Claims (10)

1. The preparation method of the silicon-carbon composite material is characterized by comprising the following steps:
and mixing the nano-cellulose solution, a silicon source and a coupling agent, and calcining to obtain the silicon-carbon composite material.
2. The method of claim 1, wherein the silicon source comprises elemental silicon and/or SiO x (ii) a The value range of x is 0.6-1.4.
3. The method according to claim 1, wherein the coupling agent comprises one or more of a silane coupling agent, a phthalate coupling agent and an aluminate coupling agent.
4. The method according to claim 1, wherein the nanocellulose solution has a mass concentration of 0.1 to 50 wt%.
5. The preparation method according to claim 4, wherein the mass ratio of the nanocellulose and the coupling agent in the nanocellulose solution is 100: 1-50;
the mass ratio of the nano-cellulose to the silicon source in the nano-cellulose solution is 1-100: 100.
6. the production method according to claim 1, wherein the mixing is performed under stirring; the stirring speed is 500rpm, and the time is 1-10 h.
7. The preparation method of claim 1, wherein the calcining temperature is 600-1300 ℃, and the holding time is 1-4 h;
the calcination is carried out under a protective atmosphere.
8. The silicon-carbon composite material prepared by the preparation method of any one of claims 1 to 7, wherein the silicon-carbon composite material comprises a silicon-based material and a carbon fiber layer coated on the surface of the silicon-based material.
9. The silicon-carbon composite material of claim 8, wherein when the silicon source is SiO x When the silicon-based material comprises elemental silicon and silicon dioxide.
10. Use of the silicon carbon composite material according to claim 9 in a lithium battery.
CN202210613164.6A 2022-05-31 2022-05-31 Silicon-carbon composite material and preparation method and application thereof Pending CN114824234A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709536A (en) * 2012-06-28 2012-10-03 东华大学 Silicon-carbon composite material and preparation method thereof
CN108336317A (en) * 2017-12-12 2018-07-27 浙江天能能源科技股份有限公司 A kind of Silicon-carbon composite material for lithium ion battery and preparation method thereof
CN108470899A (en) * 2018-03-29 2018-08-31 深圳市贝特瑞新能源材料股份有限公司 Nano-silicon/carbon composite, preparation method and include its lithium ion battery as negative material
CN108598454A (en) * 2018-05-29 2018-09-28 宁波大学 A kind of silicon-carbon cathode material, preparation method and lithium ion battery
CN109346696A (en) * 2018-10-11 2019-02-15 桑德集团有限公司 Silicon-carbon cathode material and preparation method thereof
CN111470486A (en) * 2020-04-14 2020-07-31 陕西煤业化工技术研究院有限责任公司 Three-dimensional silicon-carbon composite negative electrode material, preparation method thereof and application thereof in lithium ion battery
CN112736232A (en) * 2021-01-13 2021-04-30 欣旺达电动汽车电池有限公司 Silicon-carbon composite material, preparation method thereof, negative plate and lithium ion secondary battery

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709536A (en) * 2012-06-28 2012-10-03 东华大学 Silicon-carbon composite material and preparation method thereof
CN108336317A (en) * 2017-12-12 2018-07-27 浙江天能能源科技股份有限公司 A kind of Silicon-carbon composite material for lithium ion battery and preparation method thereof
CN108470899A (en) * 2018-03-29 2018-08-31 深圳市贝特瑞新能源材料股份有限公司 Nano-silicon/carbon composite, preparation method and include its lithium ion battery as negative material
CN108598454A (en) * 2018-05-29 2018-09-28 宁波大学 A kind of silicon-carbon cathode material, preparation method and lithium ion battery
CN109346696A (en) * 2018-10-11 2019-02-15 桑德集团有限公司 Silicon-carbon cathode material and preparation method thereof
CN111470486A (en) * 2020-04-14 2020-07-31 陕西煤业化工技术研究院有限责任公司 Three-dimensional silicon-carbon composite negative electrode material, preparation method thereof and application thereof in lithium ion battery
CN112736232A (en) * 2021-01-13 2021-04-30 欣旺达电动汽车电池有限公司 Silicon-carbon composite material, preparation method thereof, negative plate and lithium ion secondary battery

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