A High Performance All-Solid-State Lithium-Ion Battery Composited with Silicon/Carbon Anode// Li6.4La3Zr1.4Ta0.6O12/Polymer Membrane// LiFePO4/Li5FeO4 cathode

Abstract

All-solid-state lithium-ion batteries (LIBs) have many advantages over traditional LIBs including higher energy density, higher voltage endurance, intrinsic series connection, no solid electrolyte interphase (SEI) -related decay mechanism for longer life time, and the most important issue, safer than traditional LIBs. In this research, we assembled a high performance all-solid-state LIB which exhibited high energy density, good cycle stability and high safety. For the component of all-solid-state LIB, Li6.4La3Zr1.4Ta0.6O12 / polymer composited membrane was used as a solid electrolyte. This solid electrolyte exhibited good ionic conductivity thus a LIB comprised of LiFePO4//solid electrolyte//Li metal performed a well capacity of ~150 mAh/g, showing similar capacity with the LIB with liquid electrolyte. For the anode side, instead of lithium metal, silicon/carbon was used as an anode material. The ratio of silicon and carbon was optimized in order to achieve high capacity as well as good cycle stability. The cathode material in this LIB cell was LiFePO4/Li5FeO4 hybrid material which was utilized as a lithium source to compensate the irreversible capacity loss in the anode material during the first charge/discharge process. With this battery design, we successfully demonstrated a high energy-density, high cycle-stability, and high-safety all-solid-state LIB.