▎ 摘　　要

NOVELTY - An active material (100) has: 1) core particles (102) comprising silicon oxygen-containing material or metal silicon oxygen-containing material; 2) amorphous group 13 or group 15 material containing boron, aluminum, gallium, indium, thallium, nitrogen, phosphorus, arsenic, antimony and/or bismuth coated on the core particles. USE - Active material is used in anode of lithium-ion secondary battery (claimed). ADVANTAGE - The use of anode material containing improved silicon oxide active materials, in lithium-ion battery, enables to improve the cycle-life and pH stability of the battery. DETAILED DESCRIPTION - An active material (100) has: 1) core particles (102) comprising silicon oxygen-containing material (SiO) or metal silicon oxygen-containing material (M-SiOx), where x= 0-1.2, and M is selected from aluminum, calcium, copper, iron, potassium, lithium, magnesium, sodium, nickel, tin, titanium, zinc and/or zirconium; 2) amorphous group 13 or group 15 material (G13/G15 material) containing boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb) and/or bismuth (Bi) coated on the core particles. INDEPENDENT CLAIMS are included for: 1) lithium-ion secondary battery which comprises an anode containing an electrode material having the active material and a binder, a separator, a cathode and an electrolyte disposed between the anode and cathode; and 2) method of forming an active material for lithium-ion secondary battery, which involves: i) mixing 1-10 wt.% precursor material containing at least one of boron and phosphorus with 90- 99 wt.% SiO or M-SiO material core particles, to coat the core particles with the precursor material; and ii) sintering the coated core particles in an inert atmosphere, to form active material particles comprising the core particles and an amorphous group 13 or group 15 material coated on the core particles. DESCRIPTION OF DRAWING(S) - The drawing shows sectional view of active material particle. 100Active material particles 102Core particle 110Chemical stability structure