Mechanochemical synthesis of electrode materials with high capacity and their application to all-solid-state lithium secondary batteries

开发高安全性、高可靠性的全固态锂二次电池是迫切需要的。本研究采用机械力化学方法合成了高容量的磷基负极材料和硫基正极材料。机械化学法还用于在活性物质、硫化物电解液和导电添加剂之间形成良好的接触。研究发现，用锂电导的氧化物和硫化物薄膜对高压正极进行表面修饰，可以有效地提高固体电池的倍率性能和能量密度。

Development of all-solid-state lithium secondary batteries with high safety and reliability is highly demanded. In the present study, phosphorus-based anode materials and sulfur-based cathode materials with high capacity were mechanochemically synthesized. The mechanchemical process was also applied to the formation of a favorable contact among the active materials, a sulfide electrolyte and a conductive additive. It was found that surface modification of high-voltage cathodes with oxide and sulfide thin-films with lithium conductivity was effective in enhancing rate capability and energy density of solid-state batteries.