Preparation method of lithium ion battery composite negative electrode material, lithium ion battery composite negative electrode material and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult formation of a stable SEI film on the surface of the carbon coating layer, complex preparation process, and poor material cycle performance. Achieve controllable morphology, improve structural uniformity, and strong low-temperature discharge ability

Active Publication Date: 2018-12-07
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the cycle performance of the above-mentioned materials is still poor during charging and discharging. The reason may be that it is difficult to form a stable SEI film on the surface of the carbon coating layer.
In addition, the preparation methods of the above two materials are complicated, have poor stability, and are difficult to produce industrially.

Method used

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  • Preparation method of lithium ion battery composite negative electrode material, lithium ion battery composite negative electrode material and lithium ion battery
  • Preparation method of lithium ion battery composite negative electrode material, lithium ion battery composite negative electrode material and lithium ion battery
  • Preparation method of lithium ion battery composite negative electrode material, lithium ion battery composite negative electrode material and lithium ion battery

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Embodiment 1

[0036] The preparation method of the lithium-ion battery composite negative electrode material of the present embodiment comprises the following steps:

[0037] 1) Put 8g SiO 2 Diatomaceous earth with a content of 95% is mixed with 8g of magnesium powder, packed into a closed quartz tube, and Ar and H are introduced into it. 2 The mixed gas with a volume ratio of 1:1 was heated to 650°C at a heating rate of 3°C / min, and reacted for 10 hours. The product obtained by the reaction was pickled with hydrochloric acid with a mass fraction of 10% for 30 minutes to obtain a porous silicon material;

[0038] 2) Add 2g of the porous silicon material obtained in step 1) and 10g of polyacrylonitrile (PAN) into 100mL of dimethylformamide (DMF), and mix well to obtain a core spinning solution; 5g of polymethacrylic acid Methyl ester was dissolved in 100mL of dimethylformamide to obtain a shell spinning solution; the core spinning solution and the shell spinning solution were made into sili...

Embodiment 2

[0041] The preparation method of the lithium-ion battery composite negative electrode material of the present embodiment comprises the following steps:

[0042] 1) Put 5g SiO 2 Diatomaceous earth with a content of 80% is mixed with 10g of magnesium powder, packed into a closed quartz tube, and Ar and H are introduced into it. 2 The mixed gas with a volume ratio of 1:1 was heated to 500°C at a heating rate of 1°C / min, and reacted for 12 hours. The product obtained by the reaction was pickled with hydrochloric acid with a mass fraction of 5% for 60 minutes to obtain a porous silicon material;

[0043]2) Add 1g of the porous silicon material obtained in step 1) and 5g of polyacrylonitrile (PAN) into 100mL of dimethylformamide (DMF), and mix well to obtain a core spinning solution; 3g of polymethacrylic acid Methyl ester was dissolved in 100mL of dimethylformamide to obtain a shell spinning solution; the core spinning solution and the shell spinning solution were made into silico...

Embodiment 3

[0046] The preparation method of the lithium-ion battery composite negative electrode material of the present embodiment comprises the following steps:

[0047] 1) Put 10g SiO 2 Diatomaceous earth with a content of 99% is mixed with 5g of magnesium powder, packed into a closed quartz tube, and Ar and H are introduced into it. 2 The mixed gas with a volume ratio of 1:1 was heated to 800°C at a heating rate of 5°C / min, and reacted for 6 hours. The product obtained by the reaction was pickled with hydrochloric acid with a mass fraction of 20% for 10 minutes to obtain a porous silicon material;

[0048] 2) Add 3g of the porous silicon material obtained in step 1) and 5g of polyacrylonitrile (PAN) into 100mL of dimethylformamide (DMF), and mix well to obtain a core spinning solution; 6g of polymethacrylic acid Methyl ester was dissolved in 100mL of dimethylformamide to obtain a shell spinning solution; the core spinning solution and the shell spinning solution were made into silic...

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Abstract

The invention relates to a preparation method of the composite cathode material of a lithium ion battery, the composite cathode material of the lithium ion battery and the lithium ion battery and belongs to the technical field of lithium ion battery materials. The preparation method includes: dispersing silicon materials and polyacrylonitrile in a spinning solvent to obtain a core layer spinning solution, and dispersing polymethyl methacrylate in a spinning solvent to obtain a shell layer spinning solution; using the coaxial spinning technology to produce fibers so as to obtain a wrapping precursor; adding the wrapping precursor into a film-forming additive solution, mixing, and heating to remove the solvent so as to obtain a film-forming precursor; sintering the film-forming precursor under 500-800 DEG C for 1-24 hours to perform carbonization treatment so as to obtain the composite cathode material. The composite cathode material prepared by the method is high in gram volume, high in liquid absorbing and maintaining ability, excellent in circulation performance, high in low-temperature discharge ability, quite suitable for being applied to fields such as electric cars and energy storage, and the like.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery composite negative electrode material, a lithium ion battery composite negative electrode material and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have high operating voltage, long cycle life, high energy density, and no pollution to the environment. They are widely used in portable electronic devices, electric vehicles, energy storage, communications and other fields. With the application range of lithium-ion batteries The continuous expansion of lithium-ion batteries has higher and higher requirements on the electrochemical performance of lithium-ion batteries. [0003] The performance of negative electrode materials has an important impact on the electrochemical performance of lithium-ion batteries. At present, graphite is the most widely used negative electrode material for lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 赵晓锋向德波王栋梁肖亚洲
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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