Enhanced electrochemical performance of Li4Ti5O12 through in-situ coating 70Li2S-30P2S5 solid electrolyte for all-solid-state lithium batteries

Abstract High energy and power densities are the urgent task for all-solid-state lithium batteries (ASSLIBs). Intimate contact at electrode/solid electrolyte interface and high ionic conductivity of solid electrolyte are crucial to realize high-performance all-solid-state lithium batteries. Here, we provide a liquid-phase approach to in-situ coating 70Li2S-30P2S5 (LPS) solid electrolyte onto the surface of Li4Ti5O12 (LTO) nanoparticles from mineral spirit. The cells employing LTO@LPS material in combination with the LPS solid electrolyte, vapor grown carbon fibers (VGCFs) and polybutadiene (PB) as cathode and lithium metal as anode exhibit excellent rate capacity and cycling stability, showing reversible capacity of 110 mAh g−1 under a load for 0.5 mg cm−2 (with respect to LTO) at 1 C (1 C = 175 mA g−1) and 80 °C after 300 cycles, it even produces 118 mA h g-1 at 0.1 C under a high load for 4.25 mg cm−2.