Dual modified NCMA cathode with enhanced interface stability enabled high-performance sulfide-based all-solid-state lithium battery

The severe interfacial side reactions between the sulfide-types electrolyte and layered transition metal oxides materials, especially for Ni-rich cathode, are regarded as one of the mainly detrimental factors, which limited the large-scale application of its in all-solid-state lithium batteries (ASSLBs). To effectively overcome aforementioned issues, here we design a core–shell structure LiNi0.88Co0.04Mn0.05Al0.03O2 (NCMA) with a Ni-poor surface, and then is coupled with LiNbO3 coating. This unique hierarchical structure not only significantly inhibits the decomposition of Li9.54Si1.74P1.4S11.7Cl0.3 (LSiPSCl) but also retards the degradation of NCMA cathode surface from layer to spinel or rock salt phase transformation, which greatly improves the interfacial stability of both them, thus promoting the enhancement of electrochemical performance of ALSSBs. The corresponding results demonstrate that the dual-modified NCMA with high mass loading of 35.6 mg cm−2 exhibit the improved capacity retention up to 96.4% after 300 cycles at 0.5C and good rate capability with the specific discharge capacity of 128.8 mAh g−1 at 2C at the temperature of 55 °C. This impactful modification strategy opens a new avenue for the application of Ni-rich cathode materials in high energy density sulfide-based ASSLBs.