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US 10,312,523 B2Granted
Lithium ion secondary battery
AssigneeTDK Corporation
InventorsAtsushi Sano, Keitaro Otsuki
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Abstract
A lithium ion secondary battery includes: a positive electrode including a positive electrode active material layer; a negative electrode; and an electrolyte. The positive electrode active material layer contains Lia(M)b(PO4)c (M=VO or V, 0.9≤a≤3.3, 0.9≤b≤2.2, 0.9≤c≤3.3) as a first positive electrode active material, and additionally contains a fluorine compound of 1 to 300 ppm in terms of fluorine with respect to a weight of the positive electrode active material layer.
Claims7
A lithium ion secondary battery comprising:
- a positive electrode including a positive electrode active material layer;
- a negative electrode;
- and
- an electrolyte, wherein
- the positive electrode active material layer contains Lia(M)b(PO4)c (M=VO or V, 0.9≤a≤3.3, 0.9≤b≤2.2, 0.9≤c≤3.3) as a first positive electrode active material, and additionally contains a fluorine compound of 1 to 300 ppm in terms of fluorine with respect to a weight of the positive electrode active material layer, and
- the fluorine compound is present only in a region from a surface to a depth of 100 nm of the positive electrode active material layer.
3 more elements
Dependencies are inferred from the claim text.