Lithium secondary battery
AssigneeMitsubishi Cable Industries, Ltd.
InventorsMasahiro Kamauchi, Hiroshi Soejima, Shuji Kubota, Kouzou Sasaki
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Abstract
A lithium secondary battery comprising a positive electrode composed of a positive electrode active material comprising at least one member selected from the group consisting of lithium phosphate, lithium-cobalt phosphate, cobalt oxide, and lithium-cobalt oxide, such that the molar ratio of cobalt:phosphorus:lithium is more than 0.1: more than 0.2:1, a negative electrode, and an electrolyte. The lithium secondary battery of the invention has high energy density leading to high discharge capacity, high electromotive force, and high discharge voltage, and excellent cycle properties.
Claims16
A lithium secondary battery comprising a positive electrode composed of a positive electrode active material comprising cobalt, phosphorus and lithium in a molar ratio of cobalt:phosphorus:lithium of more than 0.1:more than 0.2:1, a negative electrode, and an electrolyte,
- wherein said positive electrode active material is made of a material selected from the group consisting of:
- (a) lithium phosphate and lithium-cobalt phosphate,
- (b) lithium phosphate, lithium-cobalt phosphate and cobalt oxide,
- (c) lithium phosphate, lithium-cobalt phosphate and lithium-cobalt oxide,
- (d) lithium phosphate and cobalt oxide,
- (e) lithium phosphate, cobalt oxide and lithium-cobalt oxide,
- (f) lithium phosphate anal lithium-cobalt oxide,
- (g) lithium-cobalt phosphate,
- (h) lithium-cobalt phosphate and cobalt oxide,
- (i) lithium-cobalt phosphate, cobalt oxide and lithium-cobalt oxide,
- and
- (j) lithium-cobalt phosphate and lithium-cobalt oxide.
Dependencies are inferred from the claim text.