Patent ID: 9735422
Date: 2017-08-15
CPC Classifications: B82Y,C01G,C01P,H01M,Y02E

Claim:
1. A lithium ion secondary cell, comprising: a negative electrode; a positive electrode; and an electrolytic solution, wherein the negative electrode includes a current collector and a negative-electrode active material layer bound onto the current collector and including a negative-electrode active material and a binding agent, and the negative-electrode active material includes a mixed material of silicon oxide particles which are composed of silicon oxide, and rod-shaped iron oxide particles which are composed of iron oxide, wherein the rod-shaped iron oxide particles are disposed in parallel with a surface of the current collector, the average particle diameter of the silicon oxide particles is in a range of 5 μm to 20 μm, the iron oxide particles have an average length of 0.4 μm to 0.7 μm and an average diameter of 0.085 μm to 0.17 μm, and when the entirety of the mixed material is set to 100% by mass, 5% by mass to 25% by mass of the iron oxide particles are included.