Nonaqueous electrolyte secondary battery and manufacturing method thereof
AssigneeSanyo Electric Co., Ltd.
InventorsTakanobu Chiga, Yoshinori Kida
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Abstract
A nonaqueous electrolyte secondary battery including a positive electrode 2 containing a positive electrode active material comprising a lithium-transition metal oxide having a layered structure, a negative electrode 1 and a nonaqueous electrolyte, wherein a surface treatment layer containing a compound represented by the chemical formula MlPmOn (wherein M is at least one element which can have a valence of 2, and l, m and n are integers in a range satisfying 2l+5m=2n) is formed on at least a part of the surface of the positive electrode active material.
Claims18
A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode and a nonaqueous electrolyte, the positive electrode comprising a positive electrode active material layer provided on a current collector and the positive electrode active material comprising a lithium-transition metal oxide with a layered structure, wherein a surface treatment layer containing a compound represented by chemical formula MlPmOn, wherein M is at least one element which can have a valence of 2, and l, m and n are integers in a range satisfying 2l+5m=2n, is formed on at least a part of a surface of said positive electrode active material prior to forming the positive electrode active material layer.
A manufacturing method of a positive electrode of a nonaqueous electrolyte secondary battery comprising:
- a first step where a solution containing an element M, M being at least one element which can have a valence of 2, and an element P is applied to the surface of a positive electrode active material containing a lithium-transition metal oxide with a layered structure;
- a second step where the positive electrode material of said first step is treated to form a surface treatment layer containing a compound represented by the chemical formula MlPmOn (l, m and n being integers in a range satisfying 2l+5m=2n) on at least part of a surface of the positive electrode material, and
- a third step where the positive electrode material of said second step is mixed with a conductive agent and a binder and the mixture is applied to a current collector and dried to form the positive electrode.
Dependencies are inferred from the claim text.