Secondary battery and method of manufacturing same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsTakayuki Nakatsutsumi, Kazuhiro Iida, Atsushi Fukui
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Abstract
A secondary battery includes a positive electrode containing a positive electrode active material; a negative electrode; and an electrolyte. The electrolyte contains a solvent, a lithium salt dissolved in the solvent, and a film forming compound. The film forming compound includes fluorine and an unsaturated bond between carbons. A surface of the positive electrode active material is at least partially covered with a film containing lithium, oxygen, carbon, and fluorine.
Claims14
A secondary battery comprising:
- a positive electrode containing a positive electrode active material;
- a negative electrode;
- and an electrolyte,
- wherein the electrolyte contains a solvent, a lithium salt dissolved in the solvent, and a film forming compound,
- the film forming compound includes fluorine and an unsaturated bond between carbons and is a compound to be reduced at a potential of +2.0 V or more with reference to Li, and
- a surface of the positive electrode active material is at least partially covered with a film containing lithium, oxygen, carbon, and fluorine.
(canceled)
A method for manufacturing a secondary battery, comprising:
- a step of assembling a secondary battery including a positive electrode, a negative electrode, and an electrolyte;
- and
- a film forming step of dipping the positive electrode in a solution containing a lithium salt and a film forming compound which includes fluorine and an unsaturated bond between carbons to cover a surface of the positive electrode with a film formed by reductive decomposition of the film forming compound.
Dependencies are inferred from the claim text.