Patent ID: 11961996
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A negative electrode material for nonaqueous secondary batteries, the negative electrode material comprising carbonaceous particles (A) and silicon oxide particles (B), wherein both the carbonaceous particles (A) and the silicon oxide particles (B) satisfy the following a) to c):
a) the average particle size (50% cumulative particle size from the smaller particle side; d50) is 3 μm to 30 μm, and the 10% cumulative particle size from the smaller particle side (d10) is 0.1 μm to 10 μm;
b) the ratio (R1=(d90/d10) between the 90% cumulative particle size from the smaller particle side (d90) and the d10 is 3 to 20; and
c) the ratio (R2=(d50/d10) between the d50 and the d10 is 1.7 to 5,
wherein
the carbonaceous particles (A) comprise natural graphite,
the carbonaceous particles (A) do not contain an artificial graphite, and
the carbonaceous particles (A) have a specific surface area of 20 m2/g or smaller.