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US 6,713,039 B2Granted
Lithium-manganese oxide for use in lithium secondary cell cathode and method for producing the lithium-manganese oxide
AssigneeKyushu Ceramics Industry Co., Ltd.
InventorsHiroyuki Tabata, Kazue Matsui, Noriko Anan
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Abstract
A lithium-manganese oxide for use in a lithium secondary cell cathode, having a spinel structure expressed by a chemical compositional formula of LixMn2O4-zFz (1.12≦X≦1.20, 0<Z<0.16) and having a lattice constant ranging from 8.220 to 8.230 Å, the lithium-manganese oxide including electrolytic or chemically synthesized manganese dioxide, lithium salt, and fluoride.
Claims1
A method for producing a lithium-manganese oxide for use in a lithium secondary cell cathode, comprising the steps of:
- mixing electrolytic or chemically synthesized manganese dioxide, lithium salt, and fluoride together so as to reach a Li/Mn mole ratio of 0.56≦Li/Mn>0.60 and a F/Mn mole ratio of 0<F/Mn<0.08;
- and thereafter subjecting the above mixture to primary heat treatment at a temperature ranging from 400° C. to 600° C. for a period of from two to fourteen hours and then to secondary heat treatment at a temperature ranging from 700° C. to 800° C. for a period of from ten to twenty-four hours.
Dependencies are inferred from the claim text.