Anode material capable of reducing capacity attenuation after storing lithium manganate battery

A lithium manganate battery and capacity decay technology, which is applied in the field of electrochemistry, can solve the problems of improving the capacity recovery rate after lithium manganate storage, the increase of electrode polarization and other problems that have not been clearly proposed, so as to improve the capacity recovery rate and reduce the capacity Attenuation, low production cost effect

Inactive Publication Date: 2009-02-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very few studies on the storage capacity decay of lithium manganate at home and abroad. The Journal of the Electrochemical Society of the United States (J. Electrochem Soc. 149 (2002) 1514 and J. Electrochem Soc. 151 (2004) A17) believes that the main reason for its decay is manganese The increase of electrode polarization after dissolution and storage, but there is no clear method to improve the capacity recovery rate of lithium manganate storage

Method used

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  • Anode material capable of reducing capacity attenuation after storing lithium manganate battery
  • Anode material capable of reducing capacity attenuation after storing lithium manganate battery
  • Anode material capable of reducing capacity attenuation after storing lithium manganate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take 94 grams of lithium manganate, 2 grams of Li 2 CO 3 , 2 grams of LiOH and 2 grams of nano-carbon fiber, mixed at high speed to form 100 grams of lithium manganate battery positive electrode material, and then, according to the conventional lithium-ion battery positive electrode production process, mixed with binders, conductive agents, additives, solvents, etc. Slurry is made into a positive electrode sheet of a lithium-ion battery through coating, drying, film rolling, and slitting. Its gram capacity is 110.2mAh / g. According to the conventional lithium-ion power battery manufacturing process, a lithium manganese oxide power battery is produced, and its gram capacity after 28 days of storage is 108.1mAh / g.

Embodiment 2

[0033] Take 96 grams of lithium manganate, 1.5 grams of Li 2 CO 3 , 1 gram of LiF and 1.5 grams of nano-carbon fiber, mixed at high speed to form 100 grams of lithium manganate battery positive electrode material, and then, according to the conventional lithium-ion battery positive electrode production process, mixed with binders, conductive agents, additives, solvents, etc. Slurry is made into a positive electrode sheet of a lithium-ion battery through coating, drying, film rolling, and slitting. Its gram capacity is 109.8mAh / g. According to the conventional lithium-ion power battery manufacturing process, a lithium manganese oxide power battery is produced, and its gram capacity after 28 days of storage is 107.9mAh / g.

Embodiment 3

[0035] Take 97 grams of lithium manganate, 1 gram of Li 2 CO 3 , 1 gram of LiF and 1 gram of carbon nanofiber, mixed at high speed to form 100 grams of lithium manganate battery positive electrode material, and then, according to the conventional lithium ion battery positive electrode production process, mixed with binders, conductive agents, additives, solvents, etc. Slurry is made into a positive electrode sheet of a lithium-ion battery through coating, drying, film rolling, and slitting. Its gram capacity is 110.6mAh / g. According to the conventional lithium-ion power battery production process, a lithium manganate power battery is produced, and its gram capacity after 28 days of storage is 108.4mAh / g.

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Abstract

The invention relates to an anode material, the capacity of which is attenuated after the storage of a lithium manganate battery is reduced. The anode material is composed of the following components: lithium manganate, Li2CO3, LiF or LiOH and carbon nanofibers; the anode material has the advantages that the components are simple and reasonable, the production cost is low, the circulation performance of the lithium manganate battery can be effectively enhanced, the capacity recovery rate after the storage of the lithium manganate battery is improved, and the energy density and the gram specific capacity of the lithium manganate battery are improved; the industrialized mass production can be realized, the anode material can be matched with lithium batteries of various types, and can replace the anode of the prior lithium manganate battery.

Description

technical field [0001] The invention relates to a positive electrode sheet of a lithium ion battery, in particular to a positive electrode material for reducing capacity attenuation of a lithium manganate battery after storage, and belongs to the field of electrochemistry. Background technique [0002] Energy crisis, resource shortage, and environmental pollution are severe challenges facing human existence. Finding clean, renewable, and resource-saving secondary energy is an urgent task to achieve sustainable development of human society. [0003] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries. It has been widely used in the power supply of portable electrical appliances such as wireless communication, digital camera, and notebook computer, and has broad application prospects in the power supply of spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCY02E60/10
Inventor 李新海刘云建郭华军王志兴胡启阳彭文杰张云河杨勇
Owner CENT SOUTH UNIV
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