Patent ID: 11942640
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H  Y | IPC H

Claim 0:
1. A negative electrode active material for a lithium secondary battery comprising:
a silicon-silicon oxide-magnesium silicate composite comprising:
a silicon oxide (SiOx, 0<x≤2) matrix; and
silicon (Si) crystal grains, MgSiO3 crystal grains and Mg2SiO4 crystal grains present in a silicon oxide matrix;
wherein the MgSiO3 crystal grains have a crystal size of 5-30 nm and the Mg2SiO4 crystal grains have a crystal size of 20-100 nm in the silicon-silicon oxide-magnesium silicate composite, and
a weight content ratio of MgSiO3 crystal grains to Mg2SiO4 crystal grains is 2:1-1:1.