Lithium ion secondary battery
AssigneeNEC Corporation
InventorsNoriyuki Tamura, Katsumi Maeda, Qian Cheng
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Abstract
In order to provide a lithium ion secondary battery having both high energy density and an excellent charging-rate characteristic, in the lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolyte solution, the electrolyte solution comprises 0.5 mol/l or more of Li[(FSO2)2N], 0.5 mol/l or more of LiPF6, and LiPO2F2; and the negative electrode comprises graphite deposited with amorphous carbon or graphite coated with amorphous carbon and having a specific surface area of 4 m2/g or less, as a negative electrode active material.
Claims13
A lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolyte solution, wherein
- the electrolyte solution comprises 0.5 mol/1 or more of Li[(FSO2)2N], 0.5 mol/1 or more of LiPF6, and LiPO2F2;
- and
- the negative electrode comprises graphite deposited with amorphous carbon or graphite coated with amorphous carbon and having a specific surface area of 4 m2/g or less, as a negative electrode active material.
Dependencies are inferred from the claim text.