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Low-expansion silicon-based composite material and manufacturing method thereof, silicon-based anode material and lithium ion battery

A technology of silicon-based composite materials and silicon-based negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume expansion and cannot effectively alleviate the negative electrode volume expansion, and achieve low full charge rebound and improve battery performance. Cycling performance, effect of reducing volume expansion

Inactive Publication Date: 2019-03-29
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-expansion silicon-based composite material, so as to solve the problem of large volume expansion of existing silicon-based composite materials during charge and discharge cycles
[0005] The second object of the present invention is the preparation method of the above-mentioned low-expansion silicon-based composite material, so as to solve the problem of large volume expansion of the silicon-based composite material prepared by the existing method during the charge-discharge cycle process
[0006] The third object of the present invention is to provide a silicon-based negative electrode material to solve the problem that existing silicon-carbon negative electrode materials cannot effectively alleviate the volume expansion of the negative electrode

Method used

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  • Low-expansion silicon-based composite material and manufacturing method thereof, silicon-based anode material and lithium ion battery
  • Low-expansion silicon-based composite material and manufacturing method thereof, silicon-based anode material and lithium ion battery
  • Low-expansion silicon-based composite material and manufacturing method thereof, silicon-based anode material and lithium ion battery

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Embodiment 1

[0041] Embodiment 1 of the preparation method of the low-expansion silicon-based composite material of the present invention is specifically prepared by the following steps:

[0042] 1) Weigh 1000g of liquid polyacrylonitrile in a porcelain boat, place it in a muffle furnace and raise the temperature to 250°C at 5°C / min, keep it warm for 4h, cool it down to room temperature naturally, and grind the obtained solid matter with a mortar; weigh Put 200g of the ground solid substance in a porcelain boat, place it in a tube furnace, pass in argon gas, set the furnace pressure at 0.8MPa, set the temperature at 1000°C, and heat it at a rate of 5°C / min for 10h; Cool down to 200°C at a rate of ℃ / min, and then cool naturally to room temperature to obtain a sintered solid (that is, carbon microtubes to be processed). The diameter of the carbon microtubes to be processed is 0.1-2 μm, the wall thickness is 5-30 nm, and the specific surface area 100-1000g / m 2 .

[0043] Disperse the sinter...

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Abstract

The invention relates to a low-expansion silicon-based composite material and a manufacturing method thereof, a silicon-based anode material and a lithium ion battery. The low-expansion silicon-basedcomposite material is a core-shell structure, and a core is a silicon-carbon composite material, including a carbon micrometer tube and silicon particles attached to the carbon micrometer tube, and ashell is a carbon coating layer. The low-expansion silicon-based composite material uses the carbon micrometer tube as the core and the carbon coating layer as the shell, to form the core-shell structure. Tests show that the tubular silicon-based material can greatly reduce volume expansion of the material during charge and discharge processes. After carbon coating treatment, electrical conductivity is good and stability of the material is improved, and side reaction between the material and an electrolyte is reduced, thereby being beneficial for forming a stable SEI film, reducing exposure and breakage of the silicon particles during charging and discharging processes are reduced, and greatly improving cycle life of the battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and in particular relates to a low-expansion silicon-based composite material and a preparation method, a silicon-based negative electrode material and a lithium-ion battery. Background technique [0002] At present, commercial lithium-ion batteries use graphite as the negative electrode and lithium metal oxide or lithium iron phosphate as the positive electrode material. battery needs. The improvement of battery energy density has become the main bargaining chip in the competition between material manufacturers and battery manufacturers. Among the group IV elements, silicon has a higher theoretical specific capacity (4200mAh / g) and theoretical charge density (9786mAh / cm 3 ), which is more suitable for storage of lithium ions. However, the volume expansion rate of silicon materials in the process of lithium intercalation is large, which can be as high as 300%-400%. The st...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525H01M4/38
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 万爽叶剑波陈晓铭李利淼宋文锋怀永建
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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