High rate capabilities of all-solid-state lithium secondary batteries using Li_4Ti_5O_(12)-coated LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 and a sulfide-based solid electrolyte

摘要

Rate capability of LiNi_(0.8)Co_(0.5)Al_(0.05)O_2 in solid-state cells was investigated with 70Li_2S-3OP_2S_5 glass-ceramics as a sulfide solid electrolyte. It showed higher rate capability than LiCoO_2; discharge capacity observed at a current density of 10 mAcm~(-2) was ca. 70 mAh g~(-1). Surface coating with Li_4Ti_5O_(12) onto the LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 particles further improved the high-rate performance to give ca. llOmAhg~(-1). The rate capability promises to realize all-solid-state lithium secondary batteries with very high performance.