Negative electrode for non-aqueous secondary battery and non-aqueous secondary battery, negative electrode active material and method for producing the same, composite comprising nanosilicon, carbon layer and cationic polymer layer, production of composite comprising nanosilicon and carbon layer Method

摘要

An active material including: a first active material that contains a nano silicon produced by heating a layered polysilane represented by a composition formula (SiH)n and having a structure in which multiple six-membered rings formed from silicon atoms are connected; and a second active material that contains a graphite, is used in a negative electrode. With this, expansion and contraction due to stress during charging and discharging can be mitigated, and thereby cycle characteristics improve.