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Lithium ion battery anode material and lithium ion battery and anode containing the material

A technology for lithium-ion batteries and positive electrode active materials, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of large internal resistance, small capacity, high-current charge-discharge performance and poor cycle performance, and achieve low Effects of internal resistance, improved electronic conductivity, and high capacity

Inactive Publication Date: 2008-06-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of existing lithium-ion batteries such as small capacity, large internal resistance, and poor high-current charge-discharge performance and cycle performance, and provide a battery that can have large capacity, small internal resistance, and high-current charge-discharge performance. and a positive electrode active material with good cycle performance and a positive electrode and a lithium ion battery containing the positive electrode active material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of the positive electrode active material provided by the present invention comprises uniformly mixing lithium metal phosphate, a binder and a conductive agent, wherein a dispersant is also added during mixing, and the dispersant is selected from polyacrylamide, polyacrylate , polyurethane, polyvinylpyrrolidone, polyisobutylene succinimide, polyethylene oxide ether, hydroxyethyl cellulose, dodecyl polyethylene oxide ester, fatty acid polyethylene oxide ester, alkoxy One or more of polyalkylene oxide acrylate, polycaprolactone, polystyrene-vinylpyrrolidone, polystyrene-N, N-divinyl acrylamide.

[0024] The positive electrode of the lithium ion battery provided by the present invention includes a current collector and a positive active material coated and / or filled on the current collector, and the positive active material is the positive active material provided by the present invention.

[0025] Since the present invention only relates to the impr...

Embodiment 1

[0038] This embodiment illustrates the lithium ion positive electrode material provided by the present invention and the positive electrode and lithium ion battery containing the positive electrode material.

[0039] Preparation of cathode material

[0040] Polyvinylidene fluoride (Nippon Kureha Chemical) binder with a molecular weight of 300,000, LiFePO 4 , acetylene black with a specific surface area of ​​1000 square meters per gram and polyvinylpyrrolidone (Boai Xinlianyou Chemical) dispersant with a molecular weight of 5000, according to LiFePO 4 : acetylene black: polyvinylidene fluoride: polyvinylpyrrolidone mixed in a ratio of 100:4:4:1 (by weight), to obtain the positive electrode material provided by the invention.

[0041] Preparation of positive electrode

[0042] Based on the total amount of the positive electrode material, the obtained positive electrode material is dispersed in 60% by weight of N-methylpyrrolidone, fully mixed to form a slurry, and the slurry i...

Embodiment 2

[0052] This embodiment illustrates the lithium ion positive electrode material provided by the present invention and the positive electrode and lithium ion battery containing the positive electrode material.

[0053] The battery is prepared according to the method of Example 1, the difference is that the conductive agent is superconducting carbon black with a surface area of ​​2000 square meters per gram, the binder is polyvinylidene fluoride (Japan Kureha Chemical Industry) with a molecular weight of 2,000,000, and the dispersant is a molecular weight 2000 hydroxyethyl cellulose (Hubei Xiangtai Cellulose Co., Ltd.), according to LiFePO 4 : superconducting carbon black: polytetrafluoroethylene: polyacrylamide is 100:15:1:0.1 (weight) ratio, makes thick 5 millimeters, wide 34 millimeters, the square lithium ion battery A2 of high 50 millimeters.

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Abstract

The invention relates to lithium ion battery positive pole material, which includes lithium metal phosphate, bonding agent and electric conducting agent. The invention is characterized in that the positive pole active material also includes dispersing agent, and the dispersing agent is selected from one or more of polyacrylamide, polyacrylate, polyurethane, polyvinylpyrrolidone, polyisobutylene succimide, polyethylene oxide ether, hydroxy ethyl cellulose, dodecyl polyethylene oxide ester, fatty acid polyethylene oxide ester, alkoxy poly epoxy acrylate, poly caprolactone, polystyrene-ethylene pyrrolidone, polystyrene-N and N-divinyl acrylamide. The battery of the positive pole material provided by the invention, and the capacity, the internal resistance, charging and the heavy current discharging performance and the cycle performance of the battery are obviously improved.

Description

technical field [0001] The invention relates to a positive pole material of a lithium ion battery, a positive pole containing the material and a lithium ion battery. Background technique [0002] Lithium-ion batteries have outstanding features such as high working voltage, light weight, high energy density, small self-discharge, long cycle life, no memory effect, no environmental pollution, and good safety performance. It is an ideal portable battery with high capacity at present. , can be applied to electronic devices such as cameras, mobile phones, notebook computers and portable measuring instruments. [0003] Lithium-ion batteries are widely used due to their excellent performance. Therefore, with the rapid development of modern mobile electronic equipment and communication equipment, people have put forward higher requirements for the performance of power supplies for these products. [0004] Battery cathode active materials are one of the key technologies for the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/48H01M4/02H01M10/40H01M4/136H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 沈晞潘福中尤胜萍
Owner BYD CO LTD
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