A rocking chair type all-solid-state lithium ion battery adopting Li_2O-ZrO_2 coated LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 and a sulfide based electrolyte

摘要

An all-solid-state lithium-ion battery (ASSB) using non-flammable solid electrolytes is a candidate for a next-generation battery. Although the excellent cycle performance and its high energy density are suggested in the literature, a practical size battery has not been appeared yet. In this paper, we have adopted a sulfide based electrolyte, Li_2S-P_2S_5 (80:20 mol%) to a rocking chair type lithium ion battery. The electrochemical cell consists of a Li_2O-ZrO_2 coated LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 (NCA) cathode, an artificial graphite anode and the sulfide based electrolyte without any organic and inorganic liquids. The cathode charge transfer resistance is significantly reduced by the Li_2O-ZrO_2 coating. The total cell resistance of the Li_2O-ZrO_2 (LZO) coated NCA adopted cell is approximately one quarter of non-treated one. A standard type single cell with the nominal capacity of 100 mAh at 25 ℃ is fabricated by wet printing process, and its capacity retention is approximately 80% at 100 cycles. Also, a 1 Ah class battery was constructed by stacking the single cells, and demonstrated.