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A modified lithium-ion battery cathode material, cathode and battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, active material electrodes, secondary batteries, etc., can solve problems such as poor cycle performance, low discharge rate, and low charge and discharge capacity, so as to improve performance and electrode strength , The effect of improving technical indicators

Active Publication Date: 2005-09-21
四川金泰能新材料有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

The above materials have defects such as low discharge rate, poor cycle performance, and low charge and discharge capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Carbon nanotubes with an average diameter of 50nm are selected and mixed uniformly with natural graphite at a ratio of 10% by weight to obtain a modified negative electrode material. According to the test results of conventional negative electrode evaluation methods of lithium-ion batteries, the capacity increases by 20% after 500 cycles of charging and discharging, the initial capacity increases by 10%, and the initial efficiency remains unchanged.

Embodiment 2

[0019] Nano-carbon fibers with an average diameter of 200nm are selected and mixed uniformly with natural graphite at a ratio of 10% by weight to obtain a modified negative electrode material. According to the conventional lithium-ion battery negative electrode evaluation method, the capacity increases by 15% after 500 cycles of charging and discharging, the initial capacity increases by 8%, and the initial efficiency remains unchanged.

Embodiment 3

[0021] Carbon nanotubes with an average diameter of 100nm and graphitization treatment are selected and mixed with natural graphite at a ratio of 5% by weight to obtain a modified negative electrode material. According to the conventional lithium-ion battery negative electrode evaluation method, the capacity increases by 20% after 500 cycles of charging and discharging, the initial capacity increases by 5%, and the initial efficiency remains unchanged.

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Abstract

A modified negative electrode material, negative electrode and cell of lithium ion cell, the negative electrode material made of modified quasi one dimension nano carbon material with average diameter of 1nm-500nm which is 0.1 %-50 % of total weight of negative electrode material selected from natural graphite, intermediate phase char microsphere, amorphous carbon, hard carbon, pyrolytic carbon, petroleum coke, asphalt base carbon fiber etc carbon material, and one or plurality of kinds of stannum base and silicon base material. Said invention raises the service life, charge capacity and discharge rate and effectively improves the performance of lithium ion cell.

Description

Technical field: [0001] The invention relates to rechargeable battery technology, and particularly provides a modified lithium ion battery negative electrode material, a battery negative electrode prepared with the material, and a lithium ion battery using the battery negative electrode. Background technique: [0002] Lithium-ion battery is a new type of high-efficiency chemical power supply. In 2000, its market share exceeded the sum of nickel-metal hydride and nickel-cadmium batteries. It is widely used in portable electronic products, such as mobile phones, handheld cameras, and notebook computers. With the advancement of materials and the improvement of battery design technology, the application range of lithium-ion batteries is expected to further expand from the information industry to energy transportation (electric vehicles, power grid peak shaving), aerospace, national defense and other fields. This also puts forward higher requirements on the performance of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/58H01M10/40
CPCY02E60/122Y02E60/10
Inventor 成会明刘畅张勇张绪刚李峰王作明
Owner 四川金泰能新材料有限公司
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