| abstract |
(57) Abstract: A novel carbonaceous insertion compound for a high-capacity battery capable of inserting an alkali metal is provided. SOLUTION: The following formula A x Si y C 1 -y O z , which is composed of silicon and oxygen and whose X-ray diffraction pattern is similar to that of amorphous silicon dioxide, wherein (a) A is an inserted alkali Is a metal (B) x, y, and z are x> 0, 0 <y <1, and 0 < A carbonaceous insertion compound represented by z / y <4, a method for producing the same, and a lithium ion battery using the same for a negative electrode. |