Lithium ion secondary battery

摘要

A lithium ion secondary battery includes a positive electrode including a positive electrode active material having a composition represented by the formula (1)
LixNiyCozMtO2  (1)
(wherein the element M is at least one kind selected from the group consisting of Mg, Ba, Al, Ti, Mn, V, Fe, Zr, and Mo and x, y, z, and t satisfy the following formulae: 0.9≦x≦1.2, 0≦y≦1.1, 0≦z≦1.1, and 0≦t≦1.1), and a negative electrode including a negative electrode active material mainly containing silicon and silicon oxide, and having an absorbance of 0.01 to 0.035 at 2110±10 cm−1 according to an FT-IR method.

主权项

1. A lithium ion secondary battery comprising:
a positive electrode including a positive electrode active material having a composition represented by formula (1) below; and a negative electrode including a negative electrode active material mainly containing silicon and silicon oxide, and having an absorbance of 0.01 to 0.035 at 2110±10 cm−1 according to an FT-IR method:
LixNiyCozMtO2  (1) wherein; M is at least one element selected from the group consisting of Mg, Ba, Al, Ti, Mn, V, Fe, Zr, and Mo; and x, y, z, and t satisfy the following formulae:
0.9≦x≦1.2,0≦y≦1.1,0≦z≦1.1, and0≦t≦1.1.