COMPOSITION, ANODE AND BATTERY

A composition includes a core-shell structure. The core-shell structure includes a core material and a shell material. The shell material is farther away from a center of the core-shell structure than the core material. The core material includes a structural element oxide. The structural element oxide includes a structural element. The structural element includes at least two selected from the group consisting of lithium, titanium, niobium, cobalt, copper, tin, silicon, iron, manganese and nickel. The shell material includes a mixed material. The mixed material includes a modified silicon material. The modified silicon material includes a silicon material and a polymer.