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US 7,682,742 B2Granted
Battery
AssigneeSony Corporation
InventorsKenichi Kawase, Isamu Konishiike, Masayuki Iwama, Takakazu Hirose
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Abstract
A battery capable of improving cycle characteristics is provided. An anode contains Si as an element. Where the Li insertion amount per unit area when the anode is fully charged is A, the Li amount capable of being electronically inserted per unit area of the anode is B, and the maximum utilization ratio C % is (A/B)×100, the maximum utilization ratio C % is in the range from 35% to 85%. The surface roughness Ra value of the anode current collector is 0.2 μm or more.
Claims6
A lithium ion battery comprising:
- a cathode;
- an anode;
- and
- an electrolyte,
- wherein,
- the anode includes an anode current collector and an anode active material layer on the anode current collector, and
- said anode active material layer includes oxygen (O) and silicon (Si),
- said anode current collector has a surface roughness Ra value of 0.2 μm or more,
- said anode active material layer is alloyed with said anode current collector at least in part of the interface with the anode current collector,
- when said anode is fully charged a lithium (Li) insertion amount per unit area is A,
- a lithium amount capable of being electrochemically inserted per unit area of the anode is B, and
- the maximum utilization ratio C % of said anode is (A/B)×100, the maximum utilization ratio C % is in the range from 40 to 80.
9 more elements
Dependencies are inferred from the claim text.