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Lithium ion battery negative pole piece and preparation method thereof

A technology for lithium-ion batteries and negative pole pieces, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., and can solve the problems of low compaction density, low gram capacity and high gram capacity of negative electrode materials

Pending Publication Date: 2016-03-16
FOSHAN CITY XINYUAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention discloses a negative pole piece of a lithium ion battery and a preparation method thereof, which not only solves the problems of low gram capacity, low compacted density and low conductivity of the negative electrode material, but also has the advantages of high gram capacity and high compacted density. Features, suitable for high-energy energy density lithium-ion batteries

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  • Lithium ion battery negative pole piece and preparation method thereof

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Embodiment Construction

[0019] like figure 1 As shown, the present invention provides a lithium-ion battery negative pole piece and a preparation method thereof, wherein a current collector 1 is provided in the middle of the negative pole piece, and silicon-carbon negative electrodes 2 are provided on both sides of the current collector 1, and each of the silicon-carbon negative poles 2 Hollow carbon spheres 3 are arranged between the silicon-carbon particles, and the silicon-carbon negative electrode 2 and hollow carbon spheres 3 are bonded on both sides of the current collector 1 with a binder.

[0020] The silicon-carbon particles of the silicon-carbon negative electrode 2 are spherical or elliptical, the diameter of the silicon-carbon particles is 18 μm, the diameter of the hollow carbon sphere 3 is 0.4 μm, and the current collector 1 is made of double-light copper foil , with a thickness of 8-12 μm.

[0021] The mass ratio of the silicon carbon negative electrode 2 to the hollow carbon sphere 3...

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Abstract

The invention discloses a lithium ion battery negative pole piece and a preparation method thereof, belongs to the field of battery preparation, and particularly relates to the field of lithium ion battery preparation. The lithium ion battery negative pole piece is characterized in that a current collector (1) is arranged in the middle of the negative pole piece, wherein silicon carbon negative poles (2) are arranged on two surfaces of the current collector (1); hollow carbon spheres are arranged between ever two silicon carbon particles of the silicon carbon negative poles (2); and the silicon carbon negative poles (2) and the hollow carbon spheres (3) are adhered on two surfaces of the current collector (1) by using an adhesive. According to the lithium ion battery negative pole piece, the problem that the negative pole materials are low in gram volume, low in compaction density and low in conductivity is solved; and the lithium ion battery negative pole piece has the characteristics of being high in gram volume and high in compaction density, and can be applied to the high-energy density lithium ion batteries.

Description

technical field [0001] The invention relates to the field of battery preparation, in particular to the field of lithium ion battery preparation. Background technique [0002] Lithium-ion batteries are favored by the market because of their high energy density, good cycle life, environmental friendliness and low price, and the negative pole piece is a key part of lithium-ion batteries, and affects the cycle life and rate of lithium-ion batteries Performance and safety performance. At present, the negative electrode sheet of lithium-ion battery is mainly made by coating artificial graphite and natural graphite on the surface of copper foil current collector, and making it through slicing, rolling and other processes. For example, the patent (CN201520109398.2) discloses Lithium-ion battery negative pole piece and lithium-ion battery, the lithium-ion battery negative pole piece includes a current collector and natural graphite balls bonded on the surface of the current collector...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/134H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 薛永谢志懋
Owner FOSHAN CITY XINYUAN ELECTRONICS CO LTD