Effect of sol composition on solid electrode/solid electrolyte interface for all-solid-state lithium ion battery

A property of interface between solid electrode and solid electrolyte is one of the most important keys to fabricate all-solid-state lithium ion battery. In this study, an influence of sol composition used for preparation of the electrode on the property of interface between electrode and electrolyte was examined. LiMn2O4/honeycomb Li0.55La0.35TiO3 (LLT) and Li4Mn5O12/honeycomb LLT half cells were fabricated by impregnation of mixture of active materials with various precursor sols into honeycomb holes. In the case of LiMn2O4 cathode, the sol composed of nitrate salt provides large contact area of LiMn2O4 and LLT, resulting in higher performance of the cell. Li2MnO3 impurity was produced at Li4Mn5O12/LLT interface prepared by the precursor sal composed of only nitrate or acetate salts although no impurity phase was observed at the interface prepared by acetate-nitrate sol containing lithium acetate and manganese nitrate. Li4Mn5O12/honeycomb LLT half cell prepared by the acetate-nitrate sol showed the best performance among them. It is concluded that composition of the precursor sol strongly influenced on the interface of electrode and electrolyte. The all-solid-state Li ion battery composed of LiMn2O4/honeycomb LLT/Li4Mn5O12 was successfully operated and the discharge capacity was 32 mu Ah cm(-2). (C) 2010 Elsevier Ltd. All rights reserved.