Multi-strategies interface and structure design of Li- and Mn-rich layered oxide for all-solid-state lithium batteries

Abstract

Li- and Mn-rich layered oxide (LMRO) cathode materials is highly potential for next generation lithium-ion batteries as its extremely high energy density. However, the oxygen release and the interfacial side reactions against liquid electrolytes cause severe capacity fading and their practical applications are highly impeded. Herein, all-solid-state lithium-ion batteries (ASSLIBs) are demonstrated to be a promising solution towards practical application of LMROs. For the sulfide electrolyte of Li6PS5Cl, a highly compatible interface of LMRO to the electrolyte can be constructed with extra content of Li2MnO3 in LMRO, which prevents significantly side reaction between the LMRO and electrolyte. Moreover, the Li6PS5Cl electrolyte can provide S2-/SO32- redox couple to suppress the oxygen release of LMROs. Combining a further modification in composition with a few amounts of the LiNiO2, the ionic and electronic conductivities of LMRO are evidently improved, where the highly compatible interface is preserved. As results, a superiorly high capacity of 256 mAh g−1 and an energy density of 874 Wh kg−1 at 0.1 C, meanwhile the superior capacity retention as high as 87% for 1000 cycles at 0.5 C are achieved for ASSLIBs. The result is hopefully of great helpful on realizing the practical applications of LMROs in sulfide-based ASSLIBs.