CN116682948A - Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery - Google Patents

Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery Download PDF

Info

Publication number
CN116682948A
CN116682948A CN202310504257.XA CN202310504257A CN116682948A CN 116682948 A CN116682948 A CN 116682948A CN 202310504257 A CN202310504257 A CN 202310504257A CN 116682948 A CN116682948 A CN 116682948A
Authority
CN
China
Prior art keywords
silicon
composite material
based composite
silicon carbide
negative electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310504257.XA
Other languages
Chinese (zh)
Inventor
罗国兴
张强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202310504257.XA priority Critical patent/CN116682948A/en
Publication of CN116682948A publication Critical patent/CN116682948A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • 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
    • H01M4/36—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
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The application discloses a silicon-based composite material, a negative electrode material and a lithium ion battery, wherein the core structure of the silicon-based composite material comprises a silicon carbide carrier and nano silicon deposited on the silicon carbide carrier, and at least part of nano silicon is embedded with the silicon carbide in the silicon carbide carrier; the application can obtain the lithium ion battery with obviously higher capacity and better cycle performance.

Description

Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery
Technical Field
The application relates to the field of lithium ion batteries, in particular to a silicon-based composite material, and also relates to a negative electrode material and a lithium ion battery which are applied to the silicon-based composite material.
Background
The main current negative electrode material in the field of lithium ion batteries is graphite, but the capacity of the graphite is lower and is only 375mAh/g, so that the energy density of the battery is not ideal. The theoretical capacity of silicon is 4200mAh/g, which is more than 10 times of the capacity of graphite, and obviously, the silicon-based negative electrode material can effectively reduce the weight of the battery and improve the energy density of the battery, so the silicon-based negative electrode material has become an important development direction of the negative electrode material of the lithium ion battery.
Since silicon-based anode materials have significant silicon expansion problems, one of the best solutions currently considered to be in order to suppress the expansion problems is: the silicon-based anode material is prepared by taking porous carbon particles as a carrier and then depositing nano silicon inside and outside the porous carbon particles.
The inventors then consider that the above solution still has the following drawbacks:
A. the actual gram capacity is difficult to increase: since the actual contribution capacity of the porous carbon is 200mAh/g, more and thicker nano-silicon must be deposited to increase the overall gram capacity, which further highlights the problem of silicon expansion.
B. Stability of porous carbon particles: the silicon-based anode material with higher gram capacity needs porous carbon particles with larger pore volume and larger pore diameter, but the porous carbon is not beneficial to the stability of the porous carbon as a framework, and the design of the porous carbon as a deposition carrier of nano silicon cannot be achieved, that is, the porous carbon can have negative influence on resisting silicon expansion.
C. Elemental carbon in the silicon-based anode material can catalyze the reaction of elemental silicon and fluorine in the electrolyte, so that the degradation of the silicon anode material is accelerated, and the service life of the battery is shortened.
Accordingly, the present inventors have sought to solve the above technical problems.
Disclosure of Invention
In view of the above, the present application aims to provide a silicon-based composite material, a negative electrode material and a lithium ion battery using the same, which can obtain a lithium ion battery with significantly higher capacity and better cycle performance.
The technical scheme adopted by the application is as follows:
the silicon-based composite material comprises a silicon carbide carrier and nano silicon deposited on the silicon carbide carrier, wherein at least part of the nano silicon is embedded with the silicon carbide in the silicon carbide carrier.
Preferably, the weight proportion of the nano silicon in the silicon-based composite material is not less than 20wt%, preferably 35-55wt%, more preferably 33-50wt%, and even more preferably 35-50wt%.
Preferably, the silicon carbide carrier comprises porous silicon carbide particles and/or a composite material containing a silicon carbide skeleton and/or a composite skeleton formed by compositing silicon carbide with other conductive materials; in order to stably embed the nano silicon and the silicon carbide carrier, it is further preferable that the silicon carbide carrier adopts porous silicon carbide particles which can be directly purchased from the market; of course, a silicon carbide carrier having another structure may be used, for example, a silicon carbide skeleton formed by composite sintering of nano silicon carbide, a silicon carbide skeleton deposited on a carbon skeleton may be used, and any composite material containing a silicon carbide skeleton (which can be embedded with nano silicon) or a composite skeleton formed by compositing silicon carbide with other conductive materials may be used as the silicon carbide carrier of the present application, and of course, porous silicon carbide particles are more preferable.
In order to further facilitate stable and reliable embedding of nano-silicon in porous silicon carbide particles, it is still further preferred that the outer diameter of the porous silicon carbide particles is 0.5-100 micrometers, preferably 1-50 micrometers; and/or the porous silicon carbide particles have a pore size of 0.5 to 200nm, preferably 0.8 to 150 nm, more preferably 0.8 to 50 nm, still more preferably 0.8 to 30nm, still more preferably 1 to 20 nm; preferably, the porous silicon carbide particles have a pore volume of 20 to 85%, preferably 30 to 75%, more preferably 40 to 70%, still more preferably 45 to 70% by volume; and/or the specific surface area of the porous silicon carbide particles is not less than 50m 2 Preferably 100-1500m 2 Preferably 150 to 1000m 2 Preferably 200-1000m 2 Per gram, still more preferably 220-1000m 2 /g。
Preferably, in preparing the core structure of the present application, the nano silicon deposited on the silicon carbide carrier is obtained by chemical vapor deposition method by introducing a silicon source gas into the silicon carbide carrier (in a chemical vapor deposition apparatus, the chemical vapor deposition apparatus may specifically be a fluidized bed or a rotating bed, etc.); in practice, any known silicon source gas may be used, for example, monosilane, disilane, chlorosilane, or other silicon source gas, and the like, and the present application is not limited thereto.
Preferably, in the implementation of the method, the carbon source gas (any known carbon source gas, such as alkyne gas, for example) can be intermittently introduced in the process of introducing the silicon source gas, so that the carbon layer is further embedded in the nano silicon obtained by deposition, and finally, the structural stability of the nano silicon deposition layer is further enhanced.
Preferably, the silicon-based composite material further comprises a carbon cladding layer as a shell structure; the proportion of the carbon coating layer to the silicon-based composite material is not higher than 8wt%, more preferably not higher than 6wt%, and still more preferably the proportion of the carbon coating layer to the silicon-based composite material is controlled within a range of 2-5 wt%. Preferably, the carbon coating layer serving as the shell structure can be prepared by any known method, for example, a carbon source substance (such as pitch, phenolic aldehyde, furfuryl alcohol and other carbon source components can be adopted) can be specifically adopted, and after high-temperature carbonization treatment, the carbon coating layer structure is obtained by coating the core structure through a gas phase, a liquid phase or a solid phase and other coating modes, and through the carbon coating layer structure, electrolyte can be prevented from entering the silicon-based composite material to corrode silicon during subsequent battery application.
Preferably, a negative electrode material of a lithium ion battery comprises an active raw material, wherein the active raw material comprises the silicon-based composite material; in specific embodiments, other known additive components are mixed with the active material to obtain the negative electrode material of the lithium ion battery, and the present application is not particularly limited thereto.
Preferably, a lithium ion battery comprises a negative electrode piece, wherein the negative electrode piece is made of the negative electrode material; the specific charge capacity of the lithium ion battery is not less than 1500mAh/g, preferably 1500-3000mAh/g, more preferably 1800-2800mAh/g, and even more preferably 1900-2600mAh/g under the condition of 0.1C of charge-discharge multiplying power.
According to the application, the silicon carbide-nano silicon composite with high capacity and stable structure is obtained by depositing nano silicon on the silicon carbide carrier, and after the silicon carbide-nano silicon composite is applied as a negative electrode material of a lithium ion battery, the lithium ion battery with obviously higher capacity and better cycle performance can be obtained surprisingly.
Drawings
FIG. 1 is an SEM image of a silicon-based composite material obtained in example 1 of the application;
FIG. 2 is a cross-sectional SEM image of a silicon-based composite material obtained according to example 1 of the present application;
FIG. 3 is an XRD pattern of a silicon-based composite obtained in example 1 of the present application;
FIG. 4 is a cross-sectional EDS spectrum of a silicon-based composite material obtained in example 1 of the present application.
Detailed Description
The embodiment of the application discloses a silicon-based composite material, the inner core structure of which comprises a silicon carbide carrier and nano silicon deposited on the silicon carbide carrier, wherein at least part of the nano silicon is embedded with the silicon carbide in the silicon carbide carrier.
Preferably, a negative electrode material of a lithium ion battery comprises an active material comprising a silicon-based composite material as described above.
Preferably, a lithium ion battery comprises a negative electrode plate made of the negative electrode material.
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
Example 1: 50g of porous silicon carbide particles (pore size 2-4nm, specific surface area 900m 2 And/g, wherein the pore volume accounts for 66% of the volume of the porous silicon carbide particles, the outer diameter of the particles is 1-50 micrometers), the fluidized bed is vacuumized and heated to 600 ℃, monosilane gas with the flow of 200 milliliters/minute is introduced into a vapor deposition cavity of the fluidized bed, the introduction time is 2 hours, the monosilane gas is cracked into nano silicon and deposited on the porous silicon carbide particles, and the inner core structure of the silicon-based composite material is obtained, wherein at least part of nano silicon and the porous silicon carbide are embedded in the inner core structure;
and then uniformly mixing the obtained core structure with asphalt resin, sintering the mixture under the condition of heating to 900 ℃ in an inert atmosphere, coating the core structure to obtain a carbon coating layer serving as a shell structure, and cooling and crushing the carbon coating layer to obtain the silicon-based composite material.
The SEM image of the silicon-based composite material obtained in this example 1 is shown in fig. 1, the SEM image of the cross-sectional structure is shown in fig. 2, the XRD image is shown in fig. 3, the EDS spectrum of the cross-sectional structure is shown in fig. 4, and it can be seen from the content of the EDS spectrum shown in fig. 4 that the nano-silicon particles of the silicon-based composite material provided in this example 1 are uniformly embedded in the porous silicon carbide.
Example 2: the rest of the technical solutions in this embodiment 2 are the same as those in embodiment 1, and only the difference is that in this embodiment 2, the porous silicon carbide particles are selected as follows: pore diameter of 6-8nm and specific surface area of 500m 2 And/g, wherein the pore volume is 55% of the volume, and the outer diameter of the particles is 1-50 microns.
Example 3: the rest of the technical solutions in this embodiment 3 are the same as those in embodiment 1, and only the difference is that in this embodiment 3, the porous silicon carbide particles are selected as follows: pore diameter of 10-20nm and specific surface area of 227m 2 And/g, wherein the pore volume is 45% of the volume, and the outer diameter of the particles is 1-50 microns.
Example 4: the book is provided withThe remaining technical solutions of embodiment 4 are the same as those of embodiment 1, except that in this embodiment 4, the porous silicon carbide particles are selected as follows: pore diameter of 16-30nm and specific surface area of 150m 2 And/g, wherein the pore volume is 43.6% of the volume, and the outer diameter of the particles is 1-50 microns.
Example 5: the remaining technical solutions of this embodiment 5 are the same as those of embodiment 1, and only difference is that in this embodiment 5, the porous silicon carbide particles are selected as follows: pore diameter of 16-48nm and specific surface area of 120m 2 And/g, wherein the pore volume is 41.3% of the volume, and the outer diameter of the particles is 1-50 microns.
Example 6: the rest of the technical solutions in this embodiment 6 are the same as those in embodiment 1, and only the difference is that in this embodiment 6, the porous silicon carbide particles are selected as follows: the pore diameter is 26-120nm, and the specific surface area is 100m 2 And/g, wherein the pore volume is 39.5% of the volume, and the outer diameter of the particles is 1-50 microns.
Example 7: the other technical solutions of this example 7 are the same as those of example 1, except that in this example 7, after the fluidized bed is vacuumized and heated to 650 ℃, disilane gas with a flow rate of 150 ml/min is introduced into the fluidized bed for 2.5 hours, and the disilane gas is cracked into nano-silicon and deposited on porous silicon carbide particles, to obtain the core structure of the silicon-based composite material.
Example 8: the other technical solutions of this embodiment 8 are the same as those of embodiment 1, except that in this embodiment 8, after the fluidized bed is vacuumized and heated to 750 ℃, chlorosilane gas with a flow rate of 180 ml/min is introduced into the vapor deposition cavity of the fluidized bed, and the introduction time is 2 hours, and the chlorosilane gas is cracked into nano silicon and deposited on porous silicon carbide particles, so as to obtain the core structure of the silicon-based composite material.
Example 9: the other technical solutions of this embodiment 9 are the same as those of embodiment 1, except that in this embodiment 9, after the core structure of the silicon-based composite material is obtained, methane gas (as a carbon source) with a flow rate of 50 ml/min is introduced into the vapor deposition cavity of the fluidized bed for 1 hour, and the methane gas is cracked into amorphous carbon to coat the core structure to obtain a carbon coating layer as a shell structure, and then the silicon-based composite material is obtained after cooling and crushing.
Example 10: the rest of the technical solutions in this embodiment 10 are the same as those in embodiment 1, except that in this embodiment 10, 50g of silicon carbide carrier is added into the vapor deposition cavity of the fluidized bed, and the silicon carbide carrier adopts a silicon carbide skeleton formed by composite sintering of nano silicon carbide.
Example 11: the other technical solutions of this embodiment 11 are the same as embodiment 1, except that in this embodiment 11, monosilane gas with a flow rate of 200 ml/min is introduced into the vapor deposition chamber of the fluidized bed for 1.5 hours, then methane gas with a flow rate of 100 ml/min is introduced into the vapor deposition chamber of the fluidized bed for 0.5 hours, and monosilane gas with a flow rate of 200 ml/min is introduced into the vapor deposition chamber of the fluidized bed for 0.5 hours, so that the deposited nano silicon is further embedded with a carbon layer.
Comparative example 1: the other technical scheme of this comparative example 1 was the same as example 1 except that in this comparative example 1, 50g of porous carbon particles (pore diameter of 0.8 to 200nm, average pore diameter of 7.75nm, specific surface area of 226.98 m) were added to the vapor deposition chamber of the fluidized bed 2 And/g, the pore volume is 45.4% of the volume, and the outside diameter of the particles is 2-30 microns).
Comparative example 2: the other technical scheme of this comparative example 2 was the same as example 1 except that in this comparative example 2, 50g of porous carbon particles (pore diameter of 0.6 to 2400nm, average pore diameter of 3.04nm, specific surface area of 1865.85 m) were added to the vapor deposition chamber of the fluidized bed 2 And/g, the volume of the pores is 60% of the volume of the particles, and the outer diameter size of the particles is 2-30 microns).
Comparative example 3: the other technical scheme of this comparative example 3 was the same as example 1 except that in this comparative example 3, 50g of porous carbon particles (pore diameter of 0.6 to 30nm, average pore diameter of 3.4nm, specific surface area of 1634.79 m) were added to the vapor deposition chamber of the fluidized bed 2 And/g, the proportion of pore volume to the volume is 55.10 percent, and the external diameter size of the particles is 2-30 microns).
Comparative example 4: the other technical scheme of this comparative example 4 was the same as example 1 except that in this comparative example 4, 50g of porous carbon particles (pore diameter of 0.6 to 30nm, average pore diameter of 3.4nm, specific surface area of 1948.1 m) were added to the vapor deposition chamber of the fluidized bed 2 And/g, the proportion of pore volume to the volume is 61.10 percent, and the external diameter size of the particles is 2-30 microns).
First, the present application performs silicon content measurement of each of the silicon-based composite materials provided in examples 1 to 11 and comparative examples 1 to 4 in parts by weight (equivalent to mass ratio) according to appendix B of GB/T38823-2020, and the test results are shown in Table 1 below.
In order to perform comparative verification on the technical effects of each of the silicon-based composite materials provided in examples 1 to 11 and comparative examples 1 to 4, the present application uses each of the silicon-based composite materials provided in examples and comparative examples as an active raw material of a negative electrode material, and a negative electrode sheet was fabricated according to the following method:
active raw materials of a cathode material, carbon black SP as a conductive additive, sodium carboxymethylcellulose CMC and styrene butadiene rubber SBR as adhesives are mixed according to the weight parts: 94 wt.%: 3wt%:1.5wt% to 1.5wt% and mixing the raw materials by a stirrer to obtain slurry;
and uniformly coating the slurry on a copper foil, and drying in a vacuum drying oven for 8 hours to obtain the negative electrode plate.
Then in an argon atmosphere glove box, adopting metallic lithium as a counter electrode, and adopting a solution of EC ethylene carbonate/DMC dimethyl carbonate/EMC methyl ethyl carbonate (EC: DMC: EMC volume ratio is 1:1:1) of 1mol/L LiPF6 as electrolyte to assemble the button cell.
The constant-current charge-discharge mode test is carried out on each button cell by adopting a charge-discharge instrument, wherein the charge-discharge multiplying power is 0.1C, the voltage range is 0.005V-1.5V, the first discharge specific capacity, the first coulomb efficiency and the first charge specific capacity of each button cell are respectively tested and calculated, the test calculation process of the first discharge specific capacity and the first coulomb efficiency, which are related in the whole text of the application, refer to GB/T38823-2020, the first charge specific capacity is calculated based on the first discharge specific capacity and the first coulomb efficiency obtained by the test, and the test calculation result is shown in the following table 1.
TABLE 1
As can be seen from the data shown in table 1, the lithium ion battery manufactured by using the silicon-based composite material provided by the embodiment of the application as the negative electrode active material has the performances of significantly higher capacity and better cycle performance.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. The silicon-based composite material is characterized in that the core structure of the silicon-based composite material comprises a silicon carbide carrier and nano silicon deposited on the silicon carbide carrier, wherein at least part of the nano silicon is embedded with the silicon carbide in the silicon carbide carrier.
2. The silicon-based composite material according to claim 1, wherein the nano-silicon is present in an amount of not less than 20wt%, preferably 30-55wt%, more preferably 33-50wt% based on the weight of the silicon-based composite material.
3. The silicon-based composite material according to claim 1, wherein the silicon carbide carrier comprises porous silicon carbide particles and/or a composite material comprising a silicon carbide skeleton and/or a composite skeleton formed by compositing silicon carbide with other conductive materials.
4. A silicon-based composite material according to claim 3, wherein the porous silicon carbide particles have an outer diameter of 0.5-100 microns, preferably 1-50 microns; and/or the porous silicon carbide particles have a pore size of 0.5 to 300 nm, preferably 0.8 to 150 nm.
5. A silicon-based composite material according to claim 3, wherein the pore volume in the porous silicon carbide particles is in the range of 20-85%, preferably 30-75% by volume; and/or the specific surface area of the porous silicon carbide particles is not less than 50m 2 Preferably 100-1500m 2 /g。
6. The silicon-based composite material according to claim 1, wherein the silicon carbide carrier is aerated with a silicon source gas, and nano silicon deposited on the silicon carbide carrier is obtained by a chemical vapor deposition method.
7. The silicon-based composite material according to claim 6, wherein carbon source gas is intermittently introduced during the process of introducing the silicon source gas, so that a carbon layer is embedded in the deposited nano-silicon.
8. The silicon-based composite material of claim 1, further comprising a carbon cladding layer as an outer shell structure; the carbon coating layer accounts for not more than 8 weight percent of the silicon-based composite material.
9. A negative electrode material for a lithium ion battery, comprising an active material, wherein the active material comprises the silicon-based composite material according to any one of claims 1 to 8.
10. A lithium ion battery comprising a negative electrode sheet, wherein the negative electrode sheet is made of the negative electrode material of claim 9; the specific charge capacity of the lithium ion battery is not less than 1500mAh/g, preferably 1500-3000mAh/g, and more preferably 1800-2800mAh/g under the condition of 0.1C of charge-discharge multiplying power.
CN202310504257.XA 2023-05-07 2023-05-07 Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery Pending CN116682948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310504257.XA CN116682948A (en) 2023-05-07 2023-05-07 Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310504257.XA CN116682948A (en) 2023-05-07 2023-05-07 Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery

Publications (1)

Publication Number Publication Date
CN116682948A true CN116682948A (en) 2023-09-01

Family

ID=87781554

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310504257.XA Pending CN116682948A (en) 2023-05-07 2023-05-07 Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery

Country Status (1)

Country Link
CN (1) CN116682948A (en)

Similar Documents

Publication Publication Date Title
CN109273680B (en) Porous silicon-carbon negative electrode material, preparation method thereof and lithium ion battery
CN108565446B (en) Preparation method of porous nitrogen-doped carbon-coated graphite material
CN109216686A (en) A kind of lithium ion battery silicon-carbon composite material and preparation method
CN108306009B (en) Silicon oxide-carbon composite negative electrode material, preparation method thereof and lithium ion battery
CN109616630B (en) Silicon-carbon composite material with uniform carbon film and vertical graphene double coating, preparation method thereof and application of silicon-carbon composite material in lithium ion battery
CN112133896B (en) High-capacity graphite-silicon oxide composite material and preparation method and application thereof
JP2022515463A (en) Silicon oxygen composite negative electrode material, its preparation method and lithium ion battery
CN111490252A (en) Lithium metal protective layer, preparation method thereof and battery with same
CN107887571B (en) Lithium ion battery composite negative pole piece, preparation method thereof and lithium ion battery
CN113380998A (en) Silicon-carbon negative electrode material and preparation method and application thereof
CN108923037A (en) A kind of Silicon-rich SiOx-C material and its preparation method and application
CN109360946A (en) Repeatedly mixing cladding high compacted density silicon-carbon cathode material and preparation method thereof
CN111056555A (en) Lithiated silicon-based composite material, and preparation method and application thereof
CN114784253B (en) Silicon-carbon oxide composite negative electrode material for secondary battery, preparation and application
CN110048092B (en) Lithium battery silicon-carbon composite material and preparation method thereof
CN116454255B (en) Silicon-carbon negative electrode material and application thereof
CN102945950B (en) Method for in-situ growth of carbon nanotube array on metal current collector
CN110165179B (en) Lithium battery negative electrode material, preparation method thereof and lithium battery containing negative electrode material
CN115360355B (en) Three-dimensional net-shaped structure composite material for lithium battery and preparation method and application thereof
CN109309234B (en) Metallic lithium negative electrode, method of preparing the same, and lithium battery including the same
CN116314651A (en) Porous carbon silicon anode material and preparation method thereof
CN115566167A (en) Silicon-based composite material prepared by gaseous atomization method and preparation method
CN113054179B (en) Double-particle-size asphalt multi-coating shaping graphite silicon carbon negative electrode material and preparation method and application thereof
CN115566169A (en) Silica composite material, negative pole piece, lithium ion battery and preparation method thereof
CN116682948A (en) Silicon-based composite material, negative electrode material applied to silicon-based composite material and lithium ion battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination