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Silicon-carbon composite negative electrode material and preparation method thereof, electrode and secondary battery

A negative electrode material, silicon carbon composite technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as poor electrochemical performance, and achieve the effects of improving performance stability, alleviating volume expansion effect, and excellent charge-discharge efficiency.

Inactive Publication Date: 2021-06-11
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem that the electrochemical performance of the silicon-carbon composite negative electrode material obtained by the existing silicon-carbon composite negative electrode material is poor. The silicon-carbon composite negative electrode material obtained by the preparation method of the present invention has excellent performance and can be used in Improve the electrochemical performance of the battery

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  • Silicon-carbon composite negative electrode material and preparation method thereof, electrode and secondary battery
  • Silicon-carbon composite negative electrode material and preparation method thereof, electrode and secondary battery
  • Silicon-carbon composite negative electrode material and preparation method thereof, electrode and secondary battery

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preparation example Construction

[0035] A method for preparing a silicon-carbon composite negative electrode material, comprising the following steps:

[0036] S01, conducting mixed ball milling of conductive carbon and nano-silicon to obtain a silicon / carbon composite;

[0037] S02. Mixing the silicon / carbon composite and soft carbon to obtain a precursor;

[0038] S03. Calcining the precursor in an inert gas atmosphere to obtain a silicon-carbon composite negative electrode material with a core-shell structure;

[0039] Wherein, based on the total weight of the conductive carbon, the nano-silicon and the soft carbon as 100%, the weight percentage of the nano-silicon is 2%-20%, and the weight percentage of the soft carbon 2%-4%.

[0040] The preparation method of the silicon-carbon composite negative electrode material provided by the embodiment of the present invention, on the one hand, conducts mixed ball milling of conductive carbon and nano-silicon, so that the nano-silicon can be evenly embedded in the ...

Embodiment 1

[0071] This embodiment provides a silicon-carbon composite negative electrode material, the preparation method of which comprises the following steps:

[0072] (1) Weigh 2 parts of nano-silicon, 2 parts of pitch and 96 parts of artificial graphite (produced by Shanghai Shanshan, the specification is FS-1); the purity of nano-silicon is 99.9%, and the particle size is 20nm;

[0073] (2) Add nano-silicon to graphite, mix evenly, and ball mill in a planetary ball mill (produced in Shanghai, specification is PM-2A), set the ball milling speed to 250rmp, the ball milling time to 1.5h, and the ball-to-material ratio to 12:1, to obtain Silicon / carbon composite;

[0074] (3) Place the silicon / carbon composite in a VC mixer (produced in Shanghai, specification V150), add asphalt, and perform mixing until it is evenly mixed to obtain a precursor;

[0075] (4) Under a nitrogen atmosphere, calcinate the precursor in a high-temperature furnace at 850°C (SG1400 produced in Shanghai) for 2 ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a silicon-carbon composite negative electrode material and a preparation method thereof, an electrode and a secondary battery. The preparation method provided by the invention comprises the following steps: mixing and ball-milling conductive carbon and nano silicon to obtain a silicon / carbon complex; mixing the silicon / carbon composite and soft carbon to obtain a precursor; and calcining the precursor in an inert gas atmosphere to obtain the silicon-carbon composite negative electrode material with a core-shell structure, the total weight of the conductive carbon, the nanometer silicon and the soft carbon is 100%, the weight percentage of the nanometer silicon is 2%-20%, and the weight percentage of the soft carbon is 2%-4%. The silicon-carbon composite negative electrode material prepared by the preparation method has a core-shell structure and comprises a silicon / carbon composite body and a carbon layer arranged on the surface of the silicon / carbon composite body in a coating manner; in the silicon-carbon composite negative electrode material, the weight percentage of silicon is 2%-20%, and the weight percentage of the carbon layer is 2%-4%. The volume expansion effect of the silicon material is effectively relieved, and the silicon material has good cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-carbon composite negative electrode material and a preparation method thereof, and also relates to an electrode and a secondary battery. Background technique [0002] With the rapid development of new energy electric vehicles and industrial energy storage systems, the demand for lithium-ion batteries with high energy density, high power density, and long cycle life is becoming increasingly urgent. Anode materials directly affect the energy density, power density, and cycle performance of lithium-ion batteries. Therefore, the synthesis and performance research of high-capacity anode materials has attracted extensive attention from researchers. At present, the traditional lithium-ion battery anode materials are graphite materials (artificial graphite, natural graphite, mesocarbon microspheres, etc.), but due to its low specific capacity (theoreti...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 张海林洪丽白培锋
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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