Spinel Li1+xMyMn2-x-yO4, preparation method thereof and lithium-ion secondary battery

A xmymn2-x-yo4, spinel technology, applied in the field of doping spinel lithium manganate, can solve the problems of irregular lithium manganate morphology, reduced material cycle performance, low material specific capacity, etc. Excellent cycle performance, high temperature cycle performance and high specific capacity
CN101780983AInactive Publication Date: 2010-07-21BYD CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BYD CO LTD
Publication Date
2010-07-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a lithium manganese oxide material, i.e. a spinel Li1+xMyMn2-x-yO4, wherein x is less than 0.1 and more than 0, y is less than 0.1 and more than 0, and M is selected from one or a plurality of Mg, Na, Co and Al; the ratio of the 400 crystal face diffraction peak strength I400 to 311 crystal face diffraction peak strength I311 of the Li1+xMyMn2-x-yO4 is 1.05-1.25; the atomic arrangement in crystal of the material is more ordered; the crystallinity degree of the material is higher, and fewer oxygen defects in a crystal lattice exist, thereby being more favourable for the lithium ion intercalation and deintercalation process in the crystal lattice and effectively inhibiting the Jahn-Teller effect to obviously improve the cycle performance of the material; and meanwhile, the invention also provides a preparation method of the material and is simple and easy to realize process. The invention also provides a lithium-ion secondary battery using the material, and the lithium-ion secondary battery has higher specific capacity and cycle performance, especially the high-temperature cycle performance, and satisfies the requirements of the existing battery development.
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Description

technical field

[0001] The present invention relates to a kind of doping spinel lithium manganese oxide, relate in particular to a kind of spinel Li 1+x m y mn 2-x-y o 4 Its preparation method and lithium ion secondary battery Background technique

[0002] Energy, environment, and information technology are the three major themes in the development of science and technology in the 21st century. With the depletion of traditional energy and the continuous deterioration of the earth's environment due to massive consumption, it is an urgent task to find clean and renewable secondary energy to realize the sustainable development of human society. Among many secondary battery systems, 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 main trend of secondary battery development. It has been widely used in the power supply of portable electrical appl...

Claims

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