Deep insight of interfacial stability of LiNi0.7Co0.1Mn0.2O2-based all-solid-state battery with superior performances.

Chlorine-rich argyrodite Li 5.5 PS 4.5 Cl 1.5 with low-cost and high ionic conductivity displays great potential as a solid electrolyte for solid-state battery. However, poor compatibility with bare high-voltage cathode limits its applications. Here, the Li 2 ZrO 3 coating and Li 3 InCl 6 isolating layer strategy are employed to mitigate the interfacial instability between Li 5.5 PS 4.5 Cl 1.5 electrolytes and LiNi 0.7 Co 0.1 Mn 0.2 O 2 materials, respectively. A diversified combination of two strategies is applied to construct all-solid-state batteries with a long lifespan and high energy density. Electrochemical performance results indicate that introducing Li 3 InCl 6 electrolyte in the cathode mixture yields high discharge capacities at beginning and then suffers rapid capacity degradation during extended cycling. In contrast, the assembled Li 2 ZrO 3 @LiNi 0.7 Co 0.1 Mn 0.2 O 2 /Li 5.5 PS 4.5 Cl 1.5 /Li–In battery delivers slightly lower capacities and superior capacity retention. Multiple characterization methods are employed to unravel the mechanism behind battery performance differences. The poor cycle performance of Li 3 InCl 6 -involved solid-state battery configurations is partially associated with the decomposition of Li 3 InCl 6 in the cathode mixture. The Li 2 ZrO 3 coating layer mitigates the side reaction between LiNi 0.7 Co 0.1 Mn 0.2 O 2 and Li 3 InCl 6 , resulting in enhanced capacities and improved cyclability. Furthermore, the interfacial instability between Li 3 InCl 6 and Li 5.5 PS 4.5 Cl 1.5 electrolytes leads to the poor cycling performance of batteries containing the Li 3 InCl 6 /Li 5.5 PS 4.5 Cl 1.5 bilayer structure. This work offers a comprehensive guide for designing high-performances all-solid-state lithium batteries. • Li 2 ZrO 3 coating layer is introduced to alleviate instability of cathode interface. • Li 3 InCl 6 separator layer is utilized to isolate cathode and Li 5.5 PS 4.5 Cl 1.5. • The advantages of Li 2 ZrO 3 and Li 3 InCl 6 protecting strategies have been studied. • Two protection strategies are combined to improve battery performance. • The instability between Li 3 InCl 6 and Li 5.5 PS 4.5 Cl 1.5 affects battery performance. [ABSTRACT FROM AUTHOR]