Copper/tin/graphite multi-layer structure anode material for lithium-ion battery and preparation method of copper/tin/graphite multi-layer structure anode material

A lithium-ion battery, multi-layer structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of low specific capacity and insufficient cycle performance of graphite negative electrodes, and achieve high charge-discharge specific capacity and high-rate charge. The effect of excellent discharge performance, good electrical conductivity and cycle performance

Inactive Publication Date: 2016-04-06
XIANGTAN UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to provide a copper / tin / graphite multilayer structure negative electrode material and a preparation method thereof for the situation that the cycle performance of the existing tin-based alloy is insufficient while the specific capacity of the graphite negative electrode is low. The negative electrode material prepared by the method With high conductivity, high rate performance and long cycle performance

Method used

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  • Copper/tin/graphite multi-layer structure anode material for lithium-ion battery and preparation method of copper/tin/graphite multi-layer structure anode material
  • Copper/tin/graphite multi-layer structure anode material for lithium-ion battery and preparation method of copper/tin/graphite multi-layer structure anode material
  • Copper/tin/graphite multi-layer structure anode material for lithium-ion battery and preparation method of copper/tin/graphite multi-layer structure anode material

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Embodiment

[0071] A rough copper foil with a thickness of 15 μm and a roughness of 0.4 μm was selected as the electroplating substrate.

[0072] 1. Surface pretreatment before plating: perform electrochemical degreasing and activation treatment on the base copper foil;

[0073]

[0074] Electrolytic degreasing current density: 5A / dm 2

[0075] Degreasing fluid temperature: 55°C;

[0076] Degreasing time: 30s;

[0077] After the oil is completely removed, put it into the activator to activate;

[0078] The activator is: H 2 SO 4 : 30ml / L;

[0079] Activation temperature: room temperature;

[0080] Activation time: 20s.

[0081] 2. Pulse jet plating tin coating with a thickness of 0.5 μm:

[0082]

[0083] Pulse electroplating process parameters: average current density: 5A / dm 2 ;

[0084]

[0085] 3. Rinsing and drying: Rinse the tinned copper foil after electroplating with distilled water, and then dry it.

[0086] 4. Coating graphite layer: Coating a 100 μm thick gr...

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Abstract

The invention discloses a copper/tin/graphite multi-layer structure anode material for a lithium-ion battery and a preparation method of the copper/tin/graphite multi-layer structure anode material, and belongs to the field of anode materials for lithium-ion batteries. The method comprises the following steps: with coarse copper foil or porous copper foil as a base, sequentially platingone surface with tin and further coating the surface with graphite to obtain a two-layer film structure; and after the copper foil is electrolyzed, unoiled and activated, preparing a tin coating by a pulse jet method, coating the tin coating with a layer of graphite, and carrying out thermal treatment at 80-150 DEG C, so as to prepare the copper/tin/graphite multi-layer structure anode material. Compared with the prior art, the copper/tin/graphite multi-layer structure anode material has better cycle performance than a tin anode material, and a higher specific capacity than a graphite anode material; and meanwhile, the technological process is simple. Therefore, the application prospect is very wide.

Description

technical field [0001] The invention specifically relates to a copper / tin / graphite multilayer lithium ion battery negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials and preparation thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high power density, good safety performance, and long cycle life, and do not contain lead, cadmium, mercury and other pollutants, so they are an ideal energy storage device. With the rapid development of power tools with high power requirements such as electric vehicles and portable electrical appliances such as notebook computers, the capacity of lithium-ion batteries is increasingly required. The capacity of positive and negative electrode materials is the key to the energy density of lithium-ion batteries. In order to improve the energy density of current lithium-ion batteries, people have tu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/366H01M4/38H01M4/387H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 潘勇高攀崔俊葳罗振亚雷维新
Owner XIANGTAN UNIV
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