Importance

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Abstract

A non-aqueous electrolyte secondary battery is disclosed in which hydrogen lithium titanate prepared by an acid process of lithium titanate and having pH of 11.2 or smaller or hydrogen lithium titanate expressed by general formula H.sub.x Li.sub.y-x Ti.sub.z O.sub.4 (where y.gtoreq.x>0, 0.8.ltoreq.y.ltoreq.2.7 and 1.3.ltoreq.z.ltoreq.2.2) is employed as an active material for an electrode. Hydrogen lithium titanate may be employed as an active material for a positive electrode or a negative electrode. Thus, a charging capacity greater than a theoretical capacity is realized. It is preferable that hydrogen lithium titanate is formed into a particle shape and includes voids in the particles. It is preferable that the largest particle size is 0.1 .mu.m to 50 .mu.m and the specific surface area is 0.01 m.sup.2 /g to 300 m.sup.2 /g.

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First Claim