Eocell Limited

Shoufen Yang

Sujeet Kumar

Deepak Srivastava

Santhanam Raman

Provided is a positive electrode for a lithium ion battery, the electrode comprising a nano-crystalline layered-layered composite structure of a material having the general formula xLiMO(1&#x2212;x)LiM'Oin which 0&#x3c;x&#x3c;1, where M&#x2032; is one or more ion with an average oxidation state of three and with at least one ion being Mn or Ni, and where M is one or more ions with an average oxidation state of four. Another aspect provides a positive electrode for a lithium ion battery, the electrode comprising a nano-crystalline layered-spinel composite structure of a material having the general formula xLiMnO. (1&#x2212;x)LiMnMOin which 0.5&#x3c;x&#x3c;1.0, 0&#x2264;y&#x3c;1, and where M is one or more metal cations. Also provided is the positive electrode which comprises a nano-coating of inert oxide, inert phosphate or inert fluoride on the nano-crystalline composite structure. Additional aspects provide a lithium ion battery comprising a negative electrode, an electrolyte and the positive electrode, as well as methods of preparing the positive electrode composite structure and the nano-coating of inert oxide, inert phosphate or inert fluoride.

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Daly City, CA, United States of America

Shoufen Yang