CN111554885B - Lithium ion battery cathode material and preparation method thereof - Google Patents
Lithium ion battery cathode material and preparation method thereof Download PDFInfo
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- CN111554885B CN111554885B CN201910111805.6A CN201910111805A CN111554885B CN 111554885 B CN111554885 B CN 111554885B CN 201910111805 A CN201910111805 A CN 201910111805A CN 111554885 B CN111554885 B CN 111554885B
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- H01—ELECTRIC ELEMENTS
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- H01M4/00—Electrodes
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- 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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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract
The invention discloses a lithium ion battery cathode material and a preparation method thereof, and relates to the technical field of lithium ion batteries, wherein the lithium ion battery cathode material is of a three-dimensional structure which takes Fe3O4 as a core, takes expanded graphite as a framework, takes microcrystalline graphite as a main body, and takes hard carbon as a shell. The lithium ion battery cathode material provided by the invention takes expanded graphite as a framework, takes microcrystalline graphite as a main body and takes Fe3O4The cathode material has the advantages of high energy density, high charging and discharging speed and small lithium desorption expansion due to the three-dimensional structure formed by taking hard carbon as a core and taking the hard carbon as a shell, and can meet the requirements of a power lithium ion battery on high rate performance, high first-time efficiency and high energy density.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode material and a preparation method thereof.
Background
With the increase of environmental protection pressure and the development requirement of industrial structures, the country has more and more support for the electric automobile industry. In 2016, the investment scale of the global electric automobile industry creates new development for nearly decades, and the power lithium ion battery is used as a main component of an electric automobile, and blowout type development also occurs in nearly several years.
Electric vehicles are divided into two categories, namely pure electric vehicles and hybrid electric vehicles according to power sources, wherein in the hybrid electric vehicles, lithium ion batteries mainly have two main functions: 1. directly providing power for starting, accelerating, climbing or running of the automobile; 2. assisting the internal combustion engine to output or consume energy; the two functions have high requirements on the quick charge and quick discharge performance, namely the rate performance of the lithium ion battery, so that the rate performance of the lithium ion battery is improved, and besides the design of the lithium ion battery needs to be optimized, the anode and cathode materials determining the battery performance need to be improved; the negative electrode material with high rate performance in the current market has the defect of low energy density.
In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.
Disclosure of Invention
In order to solve the technical defects, the invention adopts the technical scheme that a lithium ion battery cathode material is provided, and the lithium ion battery cathode material is made of Fe3O4A three-dimensional structure which takes the expanded graphite as a framework, the microcrystalline graphite as a main body and the hard carbon as a shell as a core.
Another object of the present invention is to provide a method for preparing a negative electrode material of a lithium ion battery, comprising:
s1: placing the expanded graphite in a carbon source for primary dipping treatment to obtain powder A;
s2: placing the powder A in a catalyst solution for second impregnation treatment to obtain powder B;
s3: placing the powder B in a first heating furnace, and carrying out catalytic graphitization treatment on the powder B at the temperature of 1500-2000 ℃ in an inert atmosphere to obtain powder C;
s4: placing the powder C in a second heating furnace, introducing water vapor at the temperature of 650-850 ℃ in an inert atmosphere, and performing controlled oxidation treatment on the powder C to obtain powder D;
s5: and (3) placing the powder D in a third heating furnace, introducing organic gas at the temperature of 800-1200 ℃, and performing high-temperature chemical vapor deposition treatment on the powder D to obtain the lithium ion battery cathode material.
Optionally, the second dipping treatment of the powder A in the catalyst solution comprises:
and (3) placing the powder A into a catalyst solution with the mass fraction of 1-10%, stirring for 0.5-5 hours, and drying.
Optionally, the catalyst comprises at least one of ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, ferric acetate, ferric citrate, ferrocene, ferrous oxalate, ferric phosphate.
Optionally, the step of performing catalytic graphitization treatment on the powder B at the temperature of 1500-2000 ℃ in an inert atmosphere comprises: raising the temperature to 1500-2000 ℃ at a temperature rise rate of 1-10 ℃/min under an inert atmosphere, and carrying out catalytic graphitization treatment on the powder B for 1-5 h.
Optionally, the step of introducing water vapor at the temperature of 650-850 ℃ in an inert atmosphere to perform controlled oxidation treatment on the powder C comprises: raising the temperature to 650-850 ℃ at a heating rate of 1-10 ℃/min under an inert atmosphere, introducing water vapor, and carrying out controlled oxidation treatment on the powder C for 5-30 min.
Optionally, the time for performing the high temperature chemical vapor deposition treatment on the powder D is 5-60 min.
Optionally, the organic gas comprises at least one of methane, ethane, acetylene, acetone, benzene, toluene, xylene.
Optionally, the carbon source comprises at least one of resin, bitumen, heavy oil.
Optionally, the inert atmosphere comprises one of a nitrogen atmosphere, an argon atmosphere, a helium atmosphere.
Compared with the prior art, the invention has the beneficial effects that:
the lithium ion battery cathode material provided by the invention takes expanded graphite as a framework, microcrystalline graphite as a main body and Fe3O4The cathode material has the advantages of high energy density, high charging and discharging speed and small lithium desorption expansion due to the three-dimensional structure formed by taking the core and taking hard carbon as the shell, and can meet the requirements of a power lithium ion battery on high rate performance, high first-time efficiency and high energy density;
2, the method for preparing the lithium ion battery cathode material provided by the invention introduces the carbon source and the iron salt catalyst into the expanded graphite by dipping the carbon source and the catalyst, and then leads the carbon source and the iron salt to generate in-situ reaction by catalytic graphitization and controlled oxidation treatment, thereby introducing microcrystalline graphite and Fe into the prepared lithium ion battery cathode material3O4The prepared lithium ion battery cathode material has the advantages of high charging and discharging speed and small lithium intercalation and deintercalation expansion, and can meet the requirements of a power lithium ion battery on high rate performance, high first-time efficiency and high energy density.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a flow chart of a method for preparing a lithium ion battery anode material according to the present invention;
FIG. 2 is a schematic structural diagram of a product at different processing stages in the preparation process of the lithium ion battery anode material of the present invention;
FIG. 3 is a scanning electron microscope image of the lithium ion battery cathode material of the present invention;
fig. 4 is a cycle life graph of the lithium ion battery anode material of the present invention.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
The common cathode material in the current lithium ion battery is a graphite cathode, and because the interlayer spacing of the graphite cathode is small, the de-intercalated lithium expansion is large, and the requirement of quick charging cannot be met; the lithium titanate lithium ion battery is a negative electrode material such as hard carbon and lithium titanate which replace a graphite negative electrode in the market, has excellent rapid charge and discharge performance and higher rate performance, but has the defect of lower energy density.
The invention provides a lithium ion battery cathode material which can give consideration to both energy density and rate capability, aiming at solving the problem that the current lithium ion battery cathode material cannot give consideration to both energy density and rate capability3O4The lithium ion battery has a three-dimensional structure with a core and hard carbon as a shell, has the advantages of high energy density, high charging and discharging speed and small lithium intercalation and deintercalation expansion, and can meet the requirements of high multiplying power, high first-time efficiency and high energy density of a power lithium ion battery.
The lithium ion battery negative electrode material is prepared by dipping, catalytic graphitization and chemical vapor deposition, and as shown in figure 1, the preparation method comprises the following steps:
s1: placing the expanded graphite in a carbon source for primary dipping treatment to obtain powder A;
s2: placing the powder A in a catalyst solution for second impregnation treatment to obtain powder B;
s3: placing the powder B in a first heating furnace, and carrying out catalytic graphitization treatment on the powder B at 1500-2000 ℃ in an inert atmosphere to obtain powder C;
s4: placing the powder C in a second heating furnace, introducing water vapor at the temperature of 650-850 ℃ in an inert atmosphere, and performing controlled oxidation treatment on the powder C to obtain powder D;
s5: and (3) placing the powder D in a third heating furnace, introducing organic gas at the temperature of 800-1200 ℃, and performing high-temperature chemical vapor deposition treatment on the powder D to obtain the lithium ion battery cathode material.
Referring to fig. 2, because the expanded graphite has the characteristics of large porosity and good elasticity, the vermicular expanded graphite is used as a substrate to be impregnated in a carbon source, and the carbon source is introduced between the layers of the expanded graphite; after the impregnation is finished, removing redundant carbon sources in modes of suction filtration, centrifugation and the like to obtain powder A; in the present invention, when the carbon source is introduced into the expanded graphite and the impregnation is performed using the expanded graphite as a substrate, at least one of resin, pitch and heavy oil is preferably used as the carbon source.
Placing the obtained powder A in a catalyst solution for secondary impregnation treatment to introduce a catalyst to promote the reaction; the specific impregnation method comprises the steps of putting the powder A into a catalyst solution with the mass fraction of 1-10%, stirring for 0.5-5 hours, and drying to obtain powder B; the catalyst comprises at least one of ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, ferric acetate, ferric citrate, ferrocene, ferrous oxalate, ferric oxalate and ferric phosphate. After the above two impregnation steps, both the carbon source and the catalyst are introduced into the matrix expanded graphite.
Placing the powder B in a first heating furnace, and carrying out catalytic graphitization treatment on the powder B at 1500-2000 ℃ in an inert atmosphere; in the catalytic graphitization treatment process, a carbon source introduced into the expanded graphite is converted into a microcrystalline graphite structure under the catalytic action of a catalyst, and meanwhile, iron ions in the catalyst are reduced into nano iron particles, so that powder C is obtained; the specific catalytic graphitization treatment process is as follows: under an inert atmosphere, raising the temperature of a first heating furnace to 1500-2000 ℃ at a heating rate of 1-10 ℃/min, and carrying out catalytic graphitization treatment on the powder B for 1-5 h; wherein the inert atmosphere comprises one of nitrogen atmosphere, argon atmosphere and helium atmosphere. Under the protection of inert gas, in order to improve the conversion rate of the reaction, the temperature of the first heating furnace is increased to 1500-2000 ℃ in a temperature programming manner, and the temperature is kept for 1-5 h, so that a carbon source soaked in the expanded graphite is fully converted into a microcrystalline graphite structure, and meanwhile, iron ions in the catalyst are fully reduced into nano iron particles, and powder C which takes the expanded graphite as a framework and is filled with the microcrystalline graphite and the nano iron particles in the framework gap is obtained.
According to the invention, an iron salt catalyst is introduced into a reaction system by an impregnation method, and the introduced iron salt is used as a catalyst for converting a carbon source into a microcrystalline graphite structure, so that the conversion of the carbon source into the microcrystalline graphite structure can be realized at a lower temperature; on the other hand, the Fe source is also used as an iron source for preparing the lithium ion battery cathode material, so that the prepared lithium ion battery cathode material has high-capacity Fe3O4Thereby achieving the purpose of improving the specific capacity of the lithium ion battery cathode material.
Putting the powder C in a second heating furnace, introducing water vapor at the temperature of 650-850 ℃ in an inert atmosphere, and performing controlled oxidation treatment on the powder C to oxidize the nano-iron particles in the powder C to generate Fe3O4Thereby obtaining the expanded graphite as a framework, the microcrystalline graphite filled in the framework gap as a main body and the Fe filled in the framework gap3O4A powder D which is a core; the specific process of the controlled oxidation treatment is as follows: under the inert atmosphere, raising the temperature of a second heating furnace to 650-850 ℃ at the heating rate of 1-10 ℃/min, introducing water vapor, and carrying out controlled oxidation treatment on the powder C for 5-30 min; wherein the inert atmosphere comprises one of nitrogen atmosphere, argon atmosphere and helium atmosphere. Under the inert atmosphere, at the temperature of 650-850 ℃, water vapor contacts with the nano iron particles in the powder C and reacts to enable the nano iron particles to generate Fe in situ3O4Granules, thereby obtainingAnd (3) powder D. The first heating furnace and the second heating furnace are conventional heating furnaces, and the first heating furnace and the second heating furnace are preferably one of a tube furnace, a box furnace, a rotary furnace, a roller furnace, a push plate furnace and a mesh belt furnace.
In order to improve the true density of the prepared lithium ion battery anode material, the steps S1-S4 can be repeated for a plurality of times, and the steps are preferably repeated for 2-5 times so that the microcrystalline graphite as the main body and the Fe as the core3O4The particles fill the internal voids of the expanded graphite, reducing the pores inside the negative electrode material.
In order to prepare the shell of the three-dimensional structure of the lithium ion battery cathode material, the powder D is placed in a third heating furnace, organic gas is introduced at the temperature of 800-1200 ℃, the organic gas is cracked to generate pyrolytic carbon, the generated pyrolytic carbon is deposited on the surface of the powder D, the high-temperature chemical vapor deposition treatment of the powder D is completed, and the shell with the expanded graphite as a framework, the microcrystalline graphite filled in the gap of the framework as a main body and the Fe filled in the gap of the framework is obtained3O4The lithium ion battery cathode material takes hard carbon as a core and a shell. Wherein the time for performing the high-temperature chemical vapor deposition treatment on the powder D is 5-60 min; the organic gas introduced during the high-temperature chemical vapor deposition treatment is at least one of methane, ethane, acetylene, acetone, benzene, toluene and xylene.
The preparation method of the lithium ion battery cathode material provided by the invention comprises the steps of impregnating, catalyzing graphitization and chemical vapor deposition to prepare the lithium ion battery cathode material which takes the expanded graphite as a framework, takes the microcrystalline graphite as a main body and takes Fe3O4The lithium ion battery cathode material has the advantages of high energy density, high charging and discharging speed and small de-intercalation lithium expansion, and can meet the requirements of high multiplying power, high first efficiency and high energy density of a power lithium ion battery.
Example one
In this embodiment, referring to fig. 3, an anode material of a lithium ion battery is prepared by using expanded graphite as a framework, microcrystalline graphite as a main body, and Fe as a main component3O4A three-dimensional structure with a core and hard carbon as a shell.
Because the expanded graphite has the characteristics of large porosity and good elasticity, referring to fig. 4, the lithium ion battery cathode material provided by the embodiment uses the expanded graphite as a framework, so that a good conductive network can be provided for the lithium ion battery cathode material, the volume change of the lithium ion battery cathode material in the charging and discharging process can be relieved, and the cycle life of the lithium ion battery cathode material is prolonged.
The microcrystalline graphite with smaller crystals and larger interlayer spacing is filled in the gaps of the expanded graphite to serve as the main body of the lithium ion battery cathode material, so that the lithium ion can be rapidly embedded and separated, the lithium ion battery cathode material can have higher rate performance, and the requirements of a power lithium ion battery are met.
Fe with large specific capacity is filled in the lithium ion battery cathode material3O4The lithium ion battery cathode material provided by the embodiment can meet the requirements of a power lithium ion battery.
The performance of the lithium ion battery cathode material provided by the invention is tested, the compaction density of the lithium ion battery cathode material can reach 1.6g/ml, the first capacity of 1C discharge reaches 450mAh/g, the first efficiency reaches 92%, the 4C charge-discharge efficiency respectively reaches 90% and 97%, the capacity retention rate of 4C4C is more than 80% after 1000 cycles, and the lithium ion battery cathode material can meet the requirements of a power lithium ion battery.
The negative electrode material for the lithium ion battery provided in this embodiment uses the expanded graphite as the framework, the microcrystalline graphite as the main body, and Fe3O4The cathode material has the advantages of high energy density, high charging and discharging speed and small lithium desorption expansion due to the three-dimensional structure formed by taking hard carbon as a core and taking the hard carbon as a shell, and can meet the requirements of a power lithium ion battery on high rate performance, high first-time efficiency and high energy density.
The lithium ion battery cathode material provided by the embodiment has a unique three-dimensional structure, so that the cathode material has better flexibility, the expansion of the cathode material after lithium embedding is favorably buffered, the functionality of the cathode material is favorably kept, and the cycle life of the cathode material is prolonged.
Example two
The embodiment provides a preparation method of a lithium ion battery cathode material, which comprises the following steps:
s1: placing 100g of expanded graphite in asphalt for primary impregnation treatment for 1h, and removing redundant asphalt through suction filtration to obtain powder A;
s2: putting the powder A into a ferric chloride solution with the mass fraction of 1%, stirring for 0.5 hour, and drying to obtain powder B;
s3: placing the powder B in a tube furnace, heating to 1500 ℃ at the heating rate of 1 ℃/min in the nitrogen atmosphere, and carrying out catalytic graphitization treatment on the powder B for 1h to obtain powder C;
s4: placing the powder C in a tube furnace, heating to 650 ℃ at a heating rate of 1 ℃/min under the nitrogen atmosphere, introducing water vapor, carrying out controlled oxidation treatment on the powder C for 5min, and cooling to room temperature to obtain powder D;
s5: and (3) placing the powder D in a tubular furnace, introducing methane gas at the temperature of 800 ℃, and carrying out high-temperature chemical vapor deposition treatment on the powder D for 5min to obtain the lithium ion battery cathode material.
In the preparation method of the negative electrode material for the lithium ion battery provided by this embodiment, the carbon source and the iron salt catalyst are introduced into the expanded graphite by dipping the carbon source and the catalyst, and then the carbon source and the iron salt are subjected to in-situ reaction by catalytic graphitization and controlled oxidation, so that microcrystalline graphite and Fe are introduced into the prepared negative electrode material for the lithium ion battery3O4The prepared lithium ion battery cathode material has the advantages of high charging and discharging speed and small lithium intercalation and deintercalation expansion, and can meet the requirements of a power lithium ion battery on high rate performance, high first-time efficiency and high energy density.
In addition, the microcrystalline graphite and the Fe are reacted in situ3O4Is introduced into the expanded graphite, so that the prepared lithium ion battery cathodeMicrocrystalline graphite and Fe in the material3O4The distribution is uniform, and the prepared lithium ion battery cathode material has stable performance.
According to the preparation method of the lithium ion battery cathode material, the materials such as expanded graphite and the like which are rich in sources and low in price are selected as the raw materials, so that the cost of the lithium ion battery cathode material is reduced, and the lithium ion battery is convenient to popularize and apply.
In the preparation method of the lithium ion battery material provided by this embodiment, the prepared lithium ion battery negative electrode material uses the expanded graphite as the framework, the microcrystalline graphite as the main body, and the Fe as the main component3O4The cathode material has the advantages of high energy density, high charging and discharging speed and small lithium-intercalated and deintercalated expansion due to the three-dimensional structure with the core and the hard carbon as the shell, and can meet the requirements of a power lithium ion battery on high rate performance, high first-time efficiency and high energy density.
EXAMPLE III
Different from the second embodiment, this embodiment provides a preparation method of a negative electrode material of a lithium ion battery, where the preparation method includes:
s1: placing 100g of expanded graphite in asphalt for primary impregnation treatment for 0.5h, and removing redundant asphalt through suction filtration to obtain powder A;
s2: placing the powder A into an iron phosphate solution with the mass fraction of 5%, stirring for 3 hours, and drying to obtain powder B;
s3: placing the powder B in a tube furnace, heating to 1800 ℃ at a heating rate of 5 ℃/min in a nitrogen atmosphere, and carrying out catalytic graphitization treatment on the powder B for 3h to obtain powder C;
s4: placing the powder C in a tube furnace, heating to 750 ℃ at a heating rate of 5 ℃/min under the nitrogen atmosphere, introducing water vapor, performing controlled oxidation on the powder C for 20min, and cooling to room temperature to obtain powder D;
s5: and (3) placing the powder D in a tubular furnace, introducing toluene gas at the temperature of 1000 ℃, and performing high-temperature chemical vapor deposition treatment on the powder D for 30min to obtain the lithium ion battery cathode material.
Please refer to relevant contents of the second embodiment, and details are not repeated herein.
Example four
Different from the second embodiment, this embodiment provides a preparation method of a negative electrode material of a lithium ion battery, where the preparation method includes:
s1: placing 100g of expanded graphite in asphalt for primary impregnation treatment for 1h, and removing redundant asphalt through suction filtration to obtain powder A;
s2: placing the powder A into a ferric nitrate solution with the mass fraction of 10%, stirring for 5 hours, and drying to obtain powder B;
s3: placing the powder B in a tube furnace, heating to 2000 ℃ at a heating rate of 10 ℃/min in a helium atmosphere, and carrying out catalytic graphitization treatment on the powder B for 5h to obtain powder C;
s4: placing the powder C in a tube furnace, heating to 850 ℃ at a heating rate of 10 ℃/min under a helium atmosphere, introducing water vapor, performing controlled oxidation on the powder C for 30min, and cooling to room temperature to obtain powder D;
s5: and (3) placing the powder D in a tubular furnace, introducing acetylene gas at 1200 ℃, and carrying out high-temperature chemical vapor deposition treatment on the powder D for 60min to obtain the lithium ion battery cathode material.
Please refer to relevant contents of the second embodiment, and details are not repeated herein.
The foregoing is merely a preferred embodiment of the invention, which is intended to be illustrative and not limiting. It will be understood by those skilled in the art that various changes, modifications and equivalents may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A preparation method of a lithium ion battery negative electrode material is characterized by comprising the following steps:
s1: placing the expanded graphite in a carbon source for primary dipping treatment to obtain powder A;
s2: placing the powder A in a catalyst solution for second impregnation treatment to obtain powder B; the catalyst comprises at least one of ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, ferric acetate, ferric citrate, ferrocene, ferrous oxalate, ferric oxalate and ferric phosphate;
s3: placing the powder B in a first heating furnace, and carrying out catalytic graphitization treatment on the powder B at the temperature of 1500-2000 ℃ in an inert atmosphere to obtain powder C;
s4: placing the powder C in a second heating furnace, heating to 650-850 ℃ at a heating rate of 1-10 ℃/min under an inert atmosphere, introducing water vapor, and performing controlled oxidation treatment on the powder C for 5-30min to obtain powder D;
s5: placing the powder D in a third heating furnace, introducing organic gas at the temperature of 800-1200 ℃, and performing high-temperature chemical vapor deposition treatment on the powder D to obtain a lithium ion battery cathode material;
the lithium ion battery cathode material is Fe3O4A three-dimensional structure which takes the expanded graphite as a framework, the microcrystalline graphite as a main body and the hard carbon as a shell as a core.
2. The preparation method of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein the second dipping treatment of the powder A in the catalyst solution comprises:
and (3) placing the powder A into a catalyst solution with the mass fraction of 1-10%, stirring for 0.5-5 hours, and drying.
3. The method for preparing the negative electrode material of the lithium ion battery as claimed in claim 1, wherein the step of performing catalytic graphitization treatment on the powder B at the temperature of 1500-2000 ℃ in an inert atmosphere comprises the following steps: raising the temperature to 1500-2000 ℃ at a temperature rise rate of 1-10 ℃/min under an inert atmosphere, and carrying out catalytic graphitization treatment on the powder B for 1-5 h.
4. The preparation method of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein the time for performing the high temperature chemical vapor deposition treatment on the powder D is 5-60 min.
5. The method of claim 1, wherein the organic gas comprises at least one of methane, ethane, acetylene, acetone, benzene, toluene, and xylene.
6. The method for preparing a negative electrode material for a lithium ion battery according to any one of claims 1 to 5, wherein the carbon source comprises at least one of a resin, pitch, and heavy oil.
7. The method for preparing the negative electrode material for the lithium ion battery according to any one of claims 1 to 5, wherein the inert atmosphere comprises one of a nitrogen atmosphere, an argon atmosphere, and a helium atmosphere.
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| CN103236547A (en) * | 2013-04-26 | 2013-08-07 | 中国东方电气集团有限公司 | Lithium ion battery iron-carbon composite negative material and preparation method thereof |
| CN104009237A (en) * | 2014-06-09 | 2014-08-27 | 黑龙江省牡丹江农垦奥宇石墨深加工有限公司 | Ultrahigh-capacity spherical graphite cathode material and production method thereof |
| CN105355870A (en) * | 2015-10-22 | 2016-02-24 | 清华大学深圳研究生院 | Expanded graphite and nano-silicon composite material, preparation method thereof, electrode plate and battery |
| CN105576210A (en) * | 2016-02-18 | 2016-05-11 | 江西紫宸科技有限公司 | Silicon and carbon composite material for lithium ion battery anode and preparation method thereof |
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