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AssigneeEocell Ltd
InventorsSujeet Kumar, Santhanam Raman, Shoufen Yang, Deepak Srivastava
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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 xLi2MO3(1−x)LiM′O2 in which 0<x<1, where M′ 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 XLi2MnO3. (1−X)LiMn2−yMyO4 in which 0.5<x<1.0, 0≦y<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.
A positive electrode for a lithium ion battery, the positive electrode comprising a nano-crystalline layered-layered composite structure of a material having the general formula xLi2MO3(1−x)LiM′O2 in which 0<x<1, where M′ 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.
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A positive electrode for a lithium ion battery, the positive electrode comprising a nano-crystalline layered-spinel composite structure of a material having the general formula xLi2MnO3.(1−x)LiMn2−yMyO4 in which 0.5<x<1.0, 0<y<1, and where M is one or more metal cations with an average oxidation state ranging from one to four.
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A method for making a nano-crystalline composite structure of a material for a positive electrode in a lithium battery, the method comprising co-precipitation or sol-gel synthesis.
A method for applying a nano-coating of an inert oxide, inert phosphate or inert fluoride onto a nano-crystalline composite structure of a material for a positive electrode in a lithium battery, the method comprising ammonium hydroxide precipitation of a hydrated inert oxide, inert phosphate or inert fluoride from an aqueous solution onto the nano-crystalline composite structure, followed by calcination so as to form a nano layer of inert oxide, inert phosphate or inert fluoride on the nano-crystalline structure.
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Dependencies are inferred from the claim text.