Bulk Type All Solid State Batteries with 5 V Class LiNi0.5Mn1.5O4 Cathode and Li10GeP2S12 Solid Electrolyte
All solid state batteries are of key importance in the development of next generation energy storage devices with high energy density. Herein, we report the fabrication and operation of bulk type 5 V class all solid state batteries consisting of LiNi0.5Mn1.5O4 cathode, Li10GeP2S12 solid electrolyte, and Li metal anode. The 1st discharge capacity is about 80 mAh g 1 with an average voltage of 4.3 V. The discharge capacity gradually decreases during the subsequent cycles. X ray diffraction and electrochemical impedance spectroscopy measurements reveal that the capacity fading results from the growth of a resistive interfacial layer on the cathode composite. The development of suitable conductive additive and sulfide solid electrolyte materials is essential for the development of high voltage all solid state batteries.