A lithium superionic conductor for millimeter-thick battery electrode
Yuxiang Li, S. N. Song, Han‐Seul Kim, K. Nomoto, Hanvin Kim, Xueying Sun, Satoshi Hori, Kota Suzuki, Naoki Matsui, Masaaki Hirayama, Teruyasu Mizoguchi, Takashi Saito, Takashi Kamiyama, Ryoji Kanno
Abstract
No design rules have yet been established for producing solid electrolytes with a lithium-ion conductivity high enough to replace liquid electrolytes and expand the performance and battery configuration limits of current lithium ion batteries. Taking advantage of the properties of high-entropy materials, we have designed a highly ion-conductive solid electrolyte by increasing the compositional complexity of a known lithium superionic conductor to eliminate ion migration barriers while maintaining the structural framework for superionic conduction. The synthesized phase with a compositional complexity showed an improved ion conductivity. We showed that the highly conductive solid electrolyte enables charge and discharge of a thick lithium-ion battery cathode at room temperature and thus has potential to change conventional battery configurations.