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1. (WO2018159870) NEGATIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY AND MANUFACTURING METHOD THEREFOR

Pub. No.:    WO/2018/159870    International Application No.:    PCT/KR2017/002237
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: H01M 4/36
H01M 4/38
C01B 33/02
C22C 1/10
C22C 33/02
Applicants: MK ELECTRON CO., LTD.
엠케이전자 주식회사
Inventors: HONG, Soon Ho
홍순호
Title: NEGATIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY AND MANUFACTURING METHOD THEREFOR
Abstract:
Provided is a negative electrode active material for a second battery capable of providing high-capacitance and high-efficiency charge and discharge characteristics. The negative electrode active material comprises a negative electrode active material powder and a coating material layer surrounding a surface of the negative electrode active material powder. The negative electrode active material powder comprises: a silicon single phase; and a silicon-metal alloy phase surrounding the silicon single phase while forming an interface with the silicon single phase. The negative electrode active material contains 60-90 at% of silicon, 3-20 at% of iron, 0-5 at% of a first additive element, and 5-20 at% of carbon, wherein the first additive element is at least one selected from the group consisting of boron (B), magnesium (Mg), aluminum (Al), manganese (Mn), cobalt (Co), chromium (Cr), tin (Sn), molybdenum (Mo), niobium (Nb), phosphorus (P), titanium (Ti), nickel (Ni), copper (Cu), zirconium (Zr), and zinc (Zn), and wherein the coating material layer contains carbon.