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Graphite negative electrode material and lithium ion battery

A graphite anode and graphite sheet technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity of mesocarbon microspheres, high manufacturing cost, large capacity of lithium ion batteries, etc., and achieve small deformation. Effect

Active Publication Date: 2020-09-01
四川金汇能新材料股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific capacity of high-end natural graphite and high-end artificial graphite anode materials can reach 365-370mAh / g, which is close to the theoretical capacity of 372mAh / g of graphite anode materials; in order to meet the needs of fast charging, graphitized mesophase carbon microspheres are usually used as Negative electrode material, but the capacity of mesophase carbon microspheres is low, about 330mAh / g, and the manufacturing cost is high
At present, it is still impossible to achieve both large capacity and fast charging of lithium-ion batteries

Method used

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  • Graphite negative electrode material and lithium ion battery
  • Graphite negative electrode material and lithium ion battery
  • Graphite negative electrode material and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1 of the present invention provides a high-capacity graphite negative electrode material capable of rapid charge and discharge, including a matrix and a coating layer.

[0029] The matrix is ​​natural graphite, and its shape is ellipsoidal. The lamellar structure of natural graphite is perpendicular to the long axis direction of the matrix. The interlayer spacing of the lamellar structure of natural graphite is 0.3364nm. The mass ratio of the matrix in the graphite negative electrode material is 93.2%.

[0030] The cladding layer is soft carbon, and the cladding layer is evenly distributed on the surface of the substrate. The mass ratio of the coating layer in the negative electrode material is 6%. The coating layer may contain carbon nanotubes and Ketjen black with excellent conductivity, and the mass ratio of carbon nanotubes and Ketjen black in the negative electrode material is 0.8%.

[0031] The average particle size D50 of the graphite negative elec...

Embodiment 2

[0041] Embodiment 2 of the present invention provides a high-capacity graphite negative electrode material capable of rapid charge and discharge, including a substrate and a coating layer.

[0042] The matrix is ​​artificial graphite, which has a quasi-ellipsoidal shape. The lamellar structure of the artificial graphite is perpendicular to the long axis of the matrix. The interlayer spacing of the lamellar structure is 0.3366nm. The mass ratio of the matrix in the negative electrode material is 93%.

[0043] The cladding layer is soft carbon, and the cladding layer is evenly distributed on the surface of the substrate. The mass ratio of the coating layer in the negative electrode material is 5%. The coating layer may also contain carbon fiber, graphene and carbon black with excellent conductivity, and the mass ratio of carbon fiber, graphene and carbon black in the negative electrode material is 2%.

[0044] The average particle diameter D50 of the graphite negative electrode...

Embodiment 3

[0048] Embodiment 3 of the present invention provides a high-capacity graphite negative electrode material capable of rapid charge and discharge, including a substrate and a coating layer.

[0049] The matrix is ​​artificial graphite, which is ellipsoidal in shape, the lamellar structure of the artificial graphite is perpendicular to the long axis of the matrix, the interlayer spacing of the lamellar structure is 0.3378nm, and the mass ratio of the matrix in the negative electrode material is 85%.

[0050] The cladding layer is soft carbon, and the cladding layer is evenly distributed on the surface of the substrate. The mass ratio of the coating layer in the negative electrode material is 10%. The coating layer may also contain carbon fiber, graphene and carbon black with excellent conductivity, and the mass ratio of carbon fiber, graphene and carbon black in the graphite negative electrode material is 5%.

[0051] The average particle size D50 of the graphite negative elect...

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Abstract

The invention relates to a graphite cathode material which comprises a base body and a coating layer coating the surface of the base body. The base body is in a similar ellipsoidal shape and comprises mutually parallel graphite flake layer structures, and the included angles formed by the extending directions of the graphite flake layer structures and the long-axis direction of the base body are 60-90 degrees. The invention further relates to a lithium ion battery. The lithium ion battery prepared from the graphite cathode material has the outstanding advantages of excellent rate capability, high energy density and small shape deformation.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a graphite negative electrode material and a lithium ion battery made of the graphite negative electrode material. Background technique [0002] As a chemical energy storage device, lithium-ion battery has high energy density and long cycle life, and has an irreplaceable position in the application of consumer electronics such as mobile phones; at the same time, the application of lithium-ion batteries in the field of new energy vehicles is also gradually become mainstream. However, no matter whether it is a mobile phone or an electric car, there are two most significant feelings in the user experience. One is that the battery life or mileage is never long enough (for lithium-ion batteries, that is, the energy density is low), and the other is that the energy is replenished after the energy is exhausted. It's never fast enough (and in the case of a Li-ion battery, that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525H01M4/133
CPCH01M4/133H01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 吴泽轶蒋勇明张浩胡晓东吴云胜石九菊何晓云
Owner 四川金汇能新材料股份有限公司
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