▎ 摘　　要

NOVELTY - A negative electrode comprises negative electroactive material particles comprising silicon, silicon-containing alloys and tin-containing alloys dispersed within a polymeric matrix, and having a multilayer coating comprising a carbonaceous layer (A) provided on the surface of each particle and a porous elastomeric layer (B) provided on the layer (A). The elastomeric layer (B) comprises siloxane and electroconductive particles (a). The multilayer coating is capable of reversibly elongating from a contracted state to an expanded state in at least one direction to minimize or prevent fracturing of the electroactive material particles during lithium ion cycling. The polymeric matrix comprises at least one binder distributed with electroconductive particles (b). USE - Negative electrode for lithium ion electrochemical cell (claimed) used as power supply for hybrid electric vehicles and electric vehicles. ADVANTAGE - The negative electrode provides battery having high capacity and excellent durability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (i) lithium-ion electrochemical cell comprising the negative electrode, a positive electrode comprising a positive electrode active material comprising lithium, a separator, and an electrolyte. The multilayer coating minimizes or prevents fracturing of the negative electroactive material particles during lithium ion cycling to substantially maintain charge capacity of the lithium-ion electrochemical cell for greater than or equal to about 500 hours of operation; and (ii) negative electroactive material comprising a core region comprising silicon, silicon-containing alloys and tin-containing alloys, and a multilayer coating provided on surface of the core region. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of electrochemical battery cell. Battery (20) Negative electrode (22) Positive electrode (24) Electrolyte solution (30) External circuit (40)