Surface-modified and sulfide electrolyte-infiltrated LiNiCoMnO cathode for all-solid-state lithium batteries.

Sulfide-based all-solid-state lithium batteries (ASSLBs) with high-voltage Ni-rich layered cathodes have shown great potential in energy storage systems. However, the application of ASSLBs is hindered by severe interface issues and poor solid-solid contact between cathodes and sulfide electrolytes. In this work, a suitably thin LiAlGe(PO) (LAGP) coating (0.41 mS cm) is introduced onto the surface of single-crystal LiNiCoMnO particles to mitigate interface side reactions. Subsequently, sheet-type electrodes are fabricated by the infiltration of LiGePS to fill the voids and achieve highly dense solid-solid contact, thus preventing contact loss. The LiGePS-infiltrated ASSLBs with a LAGP buffer layer display a high initial discharge capacity of 141.5 mAh g at 0.05 C and ultrastable cycling for 100 cycles at 0.1 C. An effective fabrication method for highly dense electrodes is proposed in this work, which provides a new direction for scalable industrial production.