Cathode active material, its manufacturing method, and non-aqueous electrolyte secondary battery
AssigneeSony Corporation
InventorsHaruo Watanabe, Tomoyo Ooyama, Masanori Soma, Kenji Ogisu
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Abstract
A cathode active material is provided. The cathode active material includes: a composite oxide particle including at least lithium and cobalt; a coating layer which is provided in at least a part of the composite oxide particle and includes an oxide including lithium and a coating element of at least one of nickel and manganese; and a surface layer which is provided in at least a part of the coating layer and includes at least one element selected from the group consisting of silicon, tin, phosphorus, magnesium, boron, zinc, tungsten, aluminum, titanium, and zirconium.
Claims5
A cathode active material comprising:
- a composite oxide particle including at least lithium and cobalt;
- a coating layer which is provided in at least a part of said composite oxide particle and includes an oxide containing lithium and a coating element of at least one of nickel and manganese;
- and
- a surface layer containing silicon,
- wherein a construction ratio of said nickel and the manganese in said coating layer ranges from 100:0 to 30:70 as a mole ratio,
- wherein the surface layer containing silicon is formed on the coating layer containing at least one of nickel and manganese, and
- wherein the surface layer comprises metal oxide micro-particles having a primary mean diameter of 1.0 nm or more or 100 nm or less.
Dependencies are inferred from the claim text.