Recent Advancements in Interface between Cathode and Garnet Solid Electrolyte for All Solid State Li-ion Batteries

Abstract

All-solid-state lithium battery (ASSLB) with inorganic solid state electrolytes is one of promising candidates for electric vehicles and large-scale smart grids for storage of alternative energy resources due to their benefits in safety, energy density, operable temperature range, and longer cycle life. As the key component in ASSLB, inorganic lithium-ion-based solid-state electrolytes (SSEs), especially the garnet-type solid electrolytes that own ionic conductivities in the order of 10 -3 S·cm -1 at room temperature and are relative safe vs. Li metal, have obvious advantages in ASSLB. However, interfacial instability and their poor solid−solid contact between garnet and cathode result in high interfacial resistance, low efficiency, and poor cycle performance. Based on these understandings and analyses of interface characteristics and issues, this work presents a brief review on modification of interface, covering composite cathode, composite electrolyte, interface engineering, and interface layer．Some approaches of improving interface 第 7 期 李 栋, 等: 全固态锂离子电池正极与石榴石型固体电解质界面的研究进展 第 7 期 李 栋, 等: 全固态锂离子电池正极与石榴石型固体电解质界面的研究进展 697

LiNi0.6Co0.2Mn0.2O2 Cathodes Coated with Dual-Conductive Polymers for High-Rate and Long-Life Solid-State Lithium Batteries

“…With the development of battery technology, extensive attention has been paid to the improvement of safety and energy density. − Nowadays, it is difficult to further increase the energy density of commercial lithium-ion battery (LIB) systems, especially concerning the safety issues. − Replacing the flammable organic electrolytes with the stable solid electrolytes (SEs) is viewed as one of the most effective ways to improve the energy density and safety − because the SEs offer the capability of using the high-specific capacity lithium metal anodes and the high-voltage cathodes. , Furthermore, concerning the achievement of high energy density, cathodes with high mass loading and excellent kinetics are necessary. In previous reports, − a large number of electronically and ionically conductive additives were added in the cathodes, which took 20–30 wt % of the total mass of the cathode in order to form a continuous conductive network.…”