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Alkali metal titanates and methods for their synthesis

A technology of alkali metal titanate and alkali metal compound, applied in the field of lithium titanate, the manufacture of lithium titanate materials, and the field of doped lithium titanate, which can solve problems such as low efficiency

Inactive Publication Date: 2009-07-15
A123 SYSTEMS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercially available materials to date produce lithium batteries with about 80% first-cycle reversibility, which exhibits significant inefficiency.

Method used

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  • Alkali metal titanates and methods for their synthesis
  • Alkali metal titanates and methods for their synthesis
  • Alkali metal titanates and methods for their synthesis

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Embodiment Construction

[0016] According to one aspect of the present invention, a doped lithium titanate material is provided. Generally, lithium titanate is considered to have the formula Li 4 Ti 5 o 12 ; however, as known in the art, in some cases, the stoichiometry of the material may be altered without appreciably changing the underlying properties of the material. Such changes may be the result of slight oxidation or reduction of the material, slight changes in the LiTi ratio and the presence of dopant species. Therefore, in this disclosure, all such stoichiometric and non-stoichiometric materials are included within the definition of lithium titanate.

[0017] In a particular set of embodiments, lithium titanate is doped with a transition metal in an amount up to about 20 atomic percent, and some such transition metals include one of V, Zr, Nb, Mo, Mn, Fe, Cu, and Co. one or more species. In a particular instance, as discussed herein, the dopant comprises Zr, and in particular instances, ...

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Abstract

Disclosed is a doped lithium titanate and its use as an electrode in a battery. Further disclosed is a method for making an alkali metal titanate, which method includes mixing an alkali metal compound and a titanium compound, impact milling the mixture, and heating the milled mixture for a time at a temperature, which is sufficient to convert the mixture to the alkali metal titanate. The alkali metal compound can be in the form of Li2CO3 and the titanium compound can be in the form of TiO2. A dopant may be included in the mixture.

Description

[0001] Cross References to Related Applications [0001] This application claims priority to U.S. Provisional Patent Application Serial No. 60 / 810,942, filed June 5, 2006, entitled "Alkali Metal Titanates and Methods for Their Synthesis"; and Priority to U.S. Provisional Patent Application Serial No. 60 / 822,675, filed August 17, 2006, entitled "Doped Lithium Titanate Material and Methods for Its Manufacture," which both incorporated herein by reference. technical field [0002] The present invention relates generally to alkali metal titanates, and more particularly, to lithium titanate. More particularly, the present invention relates to doped lithium titanate and to methods of making lithium titanate materials that exhibit superior electrochemical properties when incorporated into lithium batteries. Background technique [0003] Alkali metal titanates have electrochemical properties that make them ideal electrode materials for a variety of devices. Lithium titanate (Li ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48C01G23/00
CPCY02E60/12Y02E60/10
Inventor P·张S·玛尼M·R·威克瑟姆
Owner A123 SYSTEMS LLC
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