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Preparation method of graphite film composite material

A thin film composite material, graphite technology, applied in the field of energy storage, can solve the problems of battery capacity attenuation, reduce the electrical contact between active materials, active materials and current collectors, etc., to achieve excellent conductivity, effective storage/release of lithium ions, The effect of mitigating the volume change effect

Inactive Publication Date: 2021-06-04
王立勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an alloy-type negative electrode material, germanium has a large volume change during the intercalation-delithiation process, which generates large mechanical stress between the active material particles and reduces the electrical contact between the active materials and between the active materials and the current collector. , the electrode material after cracking / powdering no longer participates in the electrochemical reaction, and the battery capacity decays seriously

Method used

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  • Preparation method of graphite film composite material
  • Preparation method of graphite film composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to figure 1 , a preparation method of graphite film composite material, comprising the following steps:

[0029] Select polyimide graphite film as the base material, and alternately grow nickel material and germanium material on the base material;

[0030] Regulate the power parameter and the working gas pressure of the magnetron sputtering instrument, when regulating the power parameter of the magnetron sputtering instrument, the power of the nickel material is 10W; the power of the germanium material is 10W, the described regulation magnetron sputtering instrument The working pressure is 1.5Pa;

[0031] Under the action of the magnetron sputtering instrument, the germanium material is placed in the three-dimensional layered structure of the bonding material, and the above material is cut into a pole piece, and the bonding material is grown on the surface as the shell layer, and finally the core-shell is formed. structure.

[0032] The present invention also p...

Embodiment 2

[0038] refer to figure 1 , a preparation method of graphite film composite material, comprising the following steps:

[0039] Select polyimide graphite film as the base material, and alternately grow cobalt material and germanium material on the base material

[0040] Regulate the power parameter and the working gas pressure of the magnetron sputtering instrument, when regulating the power parameter of the magnetron sputtering instrument, the power of the cobalt material is 15W; the power of the germanium material is 15W, the described regulation magnetron sputtering instrument The working pressure is 2.5Pa;

[0041] Under the action of the magnetron sputtering instrument, the germanium material is placed in the three-dimensional layered structure of the bonding material, and the above material is cut into a pole piece, and the bonding material is grown on the surface as the shell layer, and finally the core-shell is formed. structure.

[0042] The present invention also pr...

Embodiment 3

[0048] refer to figure 1 , a preparation method of graphite film composite material, comprising the following steps:

[0049] Select polyimide graphite film as the base material, and alternately grow titanium material and germanium material on the base material;

[0050]Regulate the power parameter and the working gas pressure of the magnetron sputtering instrument, when regulating the power parameter of the magnetron sputtering instrument, the power of the titanium material is 20W; the power of the germanium material is 20W, the described regulation magnetron sputtering instrument The working pressure is 4Pa;

[0051] Under the action of the magnetron sputtering instrument, the germanium material is placed in the three-dimensional layered structure of the bonding material, and the above material is cut into a pole piece, and the bonding material is grown on the surface as the shell layer, and finally the core-shell is formed. structure.

[0052] The present invention also ...

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Abstract

The invention relates to the technical field of energy storage, in particular to a preparation method of a graphite film composite material, and the method comprises the following steps of: selecting a polyimide graphite film as a substrate material, and sequentially and alternately growing a binding material and a germanium material on the substrate material; regulating and controlling power parameters and working gas pressure intensity of a magnetron sputtering instrument; under the action of regulating and controlling the magnetron sputtering instrument, enabling a germanium material to be located in a three-dimensional layered wrapping structure of the binding material, cutting the material into a pole piece, and growing the binding material on the surface of the pole piece to serve as a shell layer, thus finally forming a core-shell structure. The composite material has relatively good heat-conducting property and electrical conductivity; meanwhile, the volume change of the germanium material can be relieved, the lithium storage performance of germanium is effectively exerted, and the working cycle life is relatively long.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a preparation method of a graphite film composite material. Background technique [0002] Commercial lithium-ion battery anode materials are generally currently graphite materials are still the main force in the field of anode materials. There are many types of graphite materials, including natural flake graphite, artificial graphite and fibrous carbon materials (with graphite structure). The non-renewable natural flake graphite has a natural graphite structure, and after high temperature treatment, it can be directly used as the negative electrode material of lithium-ion batteries. Artificial graphite is generally made of natural flake graphite as aggregate, combined with other materials through hot pressing process. After a long cycle, the lithium storage capacity of natural flake graphite and artificial graphite is generally maintained at ~320mAh / g; the lithium storag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/21H01M4/583H01M4/62H01M10/0525
CPCC01B32/205C01B32/21H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王立勇
Owner 王立勇