High rate capabilities of all-solid-state lithium secondary batteries using Li4Ti5O12-coated LiNi0.8Co0.15Al0.05O2 and a sulfide-based solid electrolyte

Rate capability of LiNi0.8Co0.15Al0.05O2 in solid-state cells was investigated with 70Li(2)S-30P(2)S(5) glass-ceramics as a sulfide solid electrolyte. It showed higher rate capability than LiCoO2; discharge capacity observed at a current density of 10 mA cm(-2) was ca. 70 mAh g(-1). Surface coating with Li4Ti5O12 onto the LiNi0.8Co0.15Al0.05O2 particles further improved the high-rate performance to give ca. 110 mAh g-1. The rate capability promises to realize all-solid-state lithium secondary batteries with very high performance. (C) 2011 Elsevier B.V. All rights reserved.