Li4Ti5O12, Li(4-alpha)Zalpha Ti5O12 or Li4ZbetaTi(5-beta)O12 particles, processes for obtaining same and use as electrochemical generators

a technology of electrochemical generators and processes, applied in the field of li4ti5o12, li(4-alpha)zalpha ti5o12 or li4zbetati(5-beta)o12 particles, can solve the problems of limiting the sacrificial capacity was very small, and the electrical capacity and the size of the particles were limited
US20040202934A1Inactive Publication Date: 2004-10-14HYDRO QUEBEC CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
HYDRO QUEBEC CORP
Publication Date
2004-10-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

Synthesis process for new particles of Li4Ti5O12, Li(4-alpha)ZalphaTi5O12 or Li4ZbetaTi(5-beta)O12, preferably having a spinel structure, wherein beta is greater than 0 and less than or equal to 0.5 (preferably having a spinel structure), alpha representing a number greater than zero and less than or equal to 0.33, Z representing a source of at least one metal, preferably chosen from the group made up of Mg, Nb, Al, Zr, Ni, Co. These particles coated with a layer of carbon notably exhibit electrochemical properties that are particularly interesting as components of anodes and / or cathodes in electrochemical generators.
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Description

[0001] The present invention relates to new particles based on Li.sub.4Ti.sub.5O.sub.12, based on Li.sub.(4-.alpha.)Z.sub..alpha.Ti.sub.-5O.sub.12, or based on Li.sub.4Z.sub..beta.Ti.sub.(5-.beta.)O.sub.12.

[0002] The present invention also relates to processes that make it possible to prepare these particles and to their use, especially in the area of electrochemical devices such as electrochemical generators.DESCRIPTION OF PRIOR ART

[0003] Marketing of the lithium-ion battery by Sony, in 1990, was reported by Naguara and Tozawa, Prog. Batt. Solar Cells, 9 (1990), 209. It made possible an expansion and a significant breakthrough of batteries into the area of portable devices (telephone, computer). The technology of Li-ion batteries is based on lithium intercalation electrodes, in particular the anode which is made of graphite. At the time of the first charge, a passivation film is formed on the carbon surface. The chemistry and the composition of this passivation film are complex. Th...

Claims

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