Cathode material and battery containing same

A technology of negative electrode materials and active materials, which is applied in the field of negative electrode materials and batteries containing the negative electrode materials, which can solve the problems of affecting the safety performance of the battery, the battery is prone to swelling, and cannot be used normally, and achieves long cycle performance and good rate discharge performance , Improve the effect of safety performance and quality safety

Inactive Publication Date: 2011-01-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the problems that the batteries containing lithium titanate negative electrode materials in the prior art tend to expand during formation, circulation and high temperature, which affects the safety performance of the battery, reduces the quality and even cannot be used normall

Method used

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  • Cathode material and battery containing same
  • Cathode material and battery containing same
  • Cathode material and battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Production of the positive electrode sheet: the LiCoO 2 , acetylene black and PVDF are dissolved in N-methylpyrrolidone at a weight ratio of 100:7:4.5, stirred evenly, coated on aluminum foil, baked at a temperature of 90±5°C, and rolled to a certain Thickness, roll and cut into positive electrode sheet.

[0029] The production of the negative electrode sheet: the Li 4 Ti 5 o 12 , Activated carbon fiber (aperture ratio is about 85%, specific surface area is about 1800m 2 / g, the pore diameter is about 1nm), acetylene black and PVDF are dissolved in N-methylpyrrolidone at a weight ratio of 100:2:2:6, stirred evenly and coated on copper foil, baked at a temperature of 90± 5°C, use a tablet press to roll to a certain thickness, roll and cut into positive electrode sheets.

[0030] The above-mentioned positive and negative electrode sheets and a polypropylene (PP) separator with a thickness of 25 μm are wound into a square lithium-ion cell and stored in a square batter...

Embodiment 2

[0032] Positive and negative plates and batteries are prepared in the same manner as in Example 1, except that the aperture ratio used in the production of the negative plate is about 82%, and the specific surface area is about 1600m 2 / g, activated carbon fibers with a pore size of about 0.5nm.

Embodiment 3

[0034] The same method as in Example 1 is used to prepare positive and negative electrode sheets and batteries, except that the aperture ratio used in the production of the negative electrode sheet is about 89%, and the specific surface area is about 1900m 2 / g, activated carbon fibers with a pore size of about 5 nm.

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Abstract

The invention provides a cathode material and a battery containing the same. The cathode comprises a lithium titanate active material, a binder and activated carbon fibers, wherein the porosity of the activated carbon fibers is 60-95 percent, the specific surface area is 100-2,500m<2>/g, and the aperture is 0.1-50nm. In the invention, the performance of the battery is obviously improved, and the problem of severe expansion of the battery containing the lithium titanate active materials in the processes of formation, use and high temperature can be better solved; the performance of the prepared battery is stable, and the cycle performance, the safety performance and the quality safety of the battery are improved; and the provided battery conforms to the standards of the traditional technology and use, can be normally and safely used and has long cycle period and good rate discharge performance, thus the lithium titanate active material with good performance can be industrially applied simply and better without a complicated pretreatment process and the strict control of preparation processes.

Description

【Technical field】 [0001] The invention relates to a negative electrode material and a battery containing the negative electrode material. 【Background technique】 [0002] Lithium-ion batteries have been more and more widely used because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and no environmental pollution. With the rapid development of information technology, various electronic products have a requirements are constantly increasing. [0003] The negative electrode material of the prior art lithium-ion battery is mainly carbon materials such as graphite, but the lithium battery prepared by the graphite negative electrode has many shortcomings in the process of use, for example, lithium dendrites are generated during the charge and discharge process, and the battery is prone to short circuit. There are hidden dangers of fire and explosion, and it is also easy to react with the electrolyte to shorten the servic...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/62H01M4/48H01M4/50H01M4/52H01M10/36H01M10/40
CPCY02E60/10
Inventor 刘彦初夏玉潘福中屈丽辉江文锋
Owner BYD CO LTD
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