Composite for li-ion cells and the preparation process thereof

Abstract

Disclosed herein is a composite for Li-ion cells, comprising an active material particle for Li-ion cells and an electronically conductive elastic material bound or attached to the active material particle. According to the present invention, the electronically conductive elastic material bound or attached to the active material particle allows the particle to maintain electronic contact with the electrode laminate matrix despite ongoing movement or expansion and contraction of the active material particles, such that the cycling efficiency and reversible capacity of the Li-ion cells prepared from the composite of the present invention is improved.

1 - 11 . (canceled) 
     
     
         12 . A preparation process for a composite of Li-ion cells, comprising: binding or attaching an electronically conductive elastic material onto an active material particle for Li-ion cells. 
     
     
         13 . The process of  claim 12  wherein an attaching phase is used to bind or attach the electronically conductive elastic material onto the active material particle. 
     
     
         14 . The process of  claim 13  wherein the process further comprises:
 (1) Mixing the active material particle, the electronically conductive elastic material, and precursor material for the attaching phase in water; 
 (2) Evaporating the water; 
 (3) optionally, firing the mixture below 650° C. 
 
     
     
         15 . The process of  claim 14  wherein in operation (3), the firing is performed for 1-4 hr at 150-650° C. 
     
     
         16 . The process of  claim 13  wherein the process further comprises:
 (1) Mixing the active material particle, the electronically conductive elastic material, and precursor material for the attaching phase; 
 (2) Firing the mixture below 650° C. 
 
     
     
         17 . The process of  claim 16  wherein in operation (3), the firing is performed for 1-4 hr at 500-650° C.