High-rate performance of all-solid-state lithium secondary batteries using Li4Ti5O12 electrode

The all-solid-state Li-In/Li4Ti5O12 cell using the 80Li(2)S center dot 20P(2)S(5) (mol%) solid electrolyte was assembled to investigate rate performances. It was difficult to obtain the stable performance at the charge current density of 3.8 mA cm(-2) in the all-solid-state cell. In order to improve the rate performance, the pulverized Li4Ti5O12 particles were applied to the all-solid-state cell, which retained the reversible capacity of about 90 mAh g(-1) at 3.8 mA cm(-2). The 70Li(2)S center dot 27P(2)S(5)center dot 3P(2)O(5) glass-ceramic, which exhibits the higher lithium ion conductivity than the 80Li(2)S center dot 20P(2)S(5) solid electrolyte, was also used. The Li-In/70Li(2)S center dot 27P(2)S(5)center dot 3P(2)O(5) glass-ceramic/pulverized Li4Ti5O12 cell was charged at a current density higher than 3.8 mA cm(-2) and showed the reversible capacity of about 30 mAh g(-1) even at 10 mA cm(-2) at room temperature. (C) 2008 Elsevier B.V. All rights reserved.