Method for preparing composite cathode material by modification of graphite

A negative electrode material and graphite technology, which is applied in the field of graphite modification to prepare composite negative electrode materials, can solve problems such as poor liquid absorption capacity, low gram capacity, and poor stability, and achieve improved structural stability, large specific surface area, and improved conductivity. Effect

Inactive Publication Date: 2016-09-07
赵晓锋
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  • Application Information

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Problems solved by technology

[0003] At present, commercialized negative electrode materials are mainly artificial graphite and natural graphite, but they have problems such as low gram capacity and poor liquid absorption capacity, which seriously restrict the market's requirements for high specific energy density lithium-ion batteries for negative electrode materials. Silicon can improve the performance of negative electrode materials, but its effect is not obvious, or its stability is poor, and it is difficult to industrialize production
[0004] Chinese patent CN 103022446 A discloses a lithium-ion battery silicon oxide / carbon negative electrode material and its preparation method. Although the prepared negative electrode material has an improved gram capacity, its initial efficiency and cycle performance are poor
[0005] Chinese patent CN 105047929 A discloses a lithium-ion battery negative electrode material with a porous structure and a preparation method thereof. Although the specific surface area of ​​the negative electrode material can be increased by adding an inorganic pore-forming agent, the presence of the pore-forming agent reduces the purity of the negative electrode material and affects its Cycle performance, it is difficult to balance cycle performance, rate performance and high capacity

Method used

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  • Method for preparing composite cathode material by modification of graphite
  • Method for preparing composite cathode material by modification of graphite
  • Method for preparing composite cathode material by modification of graphite

Examples

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Effect test

Embodiment 1

[0034] I. Preparation of solution A: 5g polymethylacrylate, 3g ammonium bicarbonate, 3g carbon nanotubes and 1.5g silicon dioxide were added to 100mL of N, N-dimethylformamide under stirring conditions to prepare a uniform and transparent solution A.

[0035] II. Preparation of solution B: Add 8g of pitch to 40mL of N,N-dimethylformamide, mix and stir evenly to obtain solution B.

[0036] III. Preparation of solution C: Add solution B in above II to 100 g of solution A in above I and mix evenly to obtain solution C.

[0037] IV. Preparation of composite negative electrode material: Add 80g of graphite to the three-dimensional mixer and add 100g of solution C in the above III for stirring. During stirring, the heating rate of the three-dimensional mixer is controlled at 8°C / min and heated to 120°C. The speed of the mixer was controlled at 120 rpm and stirred for 5 hours. After that, the three-dimensional mixer continued to heat up to 800°C and kept warm for 12 hours. Finally, ...

Embodiment 2

[0039] I. Preparation of solution A: 1.0 g of polyvinyl alcohol, 1.0 g of urea, 1.0 g of graphene and 1.0 g of silicon dioxide were added to 100 mL of acetone under stirring conditions to prepare a uniform and transparent solution A.

[0040] II. Preparation of solution B: Add 5g of asphalt into 30mL of acetone, mix and stir evenly to obtain solution B.

[0041] III. Preparation of solution C: Add solution B in above II to 100 g of solution A in above I and mix evenly to obtain solution C.

[0042] IV. Preparation of composite negative electrode material: Add 50g of graphite to the three-dimensional mixer and add 100g of solution C in the above III for stirring. During stirring, the heating rate of the three-dimensional mixer is controlled at 2°C / min and heated to 100°C. The speed of the mixer was controlled at 100 rpm and stirred for 10 hours. After that, the temperature of the three-dimensional mixer continued to rise to 600 °C and kept for 24 hours. Finally, the composite n...

Embodiment 3

[0044] I. Preparation of solution A: Add 10 g of polyacrylamide, 5 g of polyethylene glycol, 5 g of hollow carbon spheres and 2 g of silicon dioxide into 100 mL of chloroform under stirring to prepare a uniform and transparent solution A.

[0045]II. Preparation of solution B: Add 10 g of asphalt into 50 mL of chloroform, mix and stir evenly to obtain solution B.

[0046] III. Preparation of solution C: Add solution B in above II to 100 g of solution A in above I and mix evenly to obtain solution C.

[0047] IV. Preparation of composite negative electrode material: Add 100g of graphite to the three-dimensional mixer and add 100g of solution C in the above III for stirring. During stirring, the heating rate of the three-dimensional mixer is controlled at 10°C / min and heated to 160°C. The speed of the mixer was controlled at 150 rpm and stirred for 1.0 h. After that, the three-dimensional mixer continued to heat up to 1000 ° C and held for 6 h. Finally, the composite negative el...

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Abstract

The invention discloses a method for preparing a composite cathode material by the modification of graphite. The method comprises four processes of preparation of a solution A, preparation of a solution B, preparation of a solution C and preparation of the composite cathode material, wherein during the preparation process of the solution A, a polymer matrix, a pore forming agent, a conductive agent, an inorganic additive and an organic solvent are used; during the preparation process of the solution B, pitch and an organic solvent are used; during the preparation process of the solution C, the solution A and the solution B are used; and during the preparation process of the composite cathode material, the graphite, the solution C and a three-dimensional mixer are used. According to the method, the graphite is modified by the pore-forming technology and doping modification technology, the composite cathode material with high capacity, high specific surface area and good conductivity can be prepared, and liquid protection capabilities, rate performance and cycle performance of the composite cathode material in the lithium ion battery are improved, and the requirement of high-energy-density lithium ion battery on the cathode material is met.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for lithium ion batteries, in particular to a method for preparing composite negative electrode materials by graphite modification. Background technique [0002] The anode material is the key material of the lithium-ion battery, and its performance plays an important role in the cycle performance, rate performance and safety performance of the lithium-ion battery. [0003] At present, commercialized negative electrode materials are mainly artificial graphite and natural graphite, but they have problems such as low gram capacity and poor liquid absorption capacity, which seriously restrict the market's requirements for high specific energy density lithium-ion batteries for negative electrode materials. Silicon can improve the performance of negative electrode materials, but its effect is not obvious, or its stability is poor, making it difficult to industrialize ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/583H01M4/62H01M4/60H01M4/36
CPCH01M4/36H01M4/583H01M4/60H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李长见
Owner 赵晓锋
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