The above study suggests that LHTO could be used as the SE in a solid-state battery. To examine the performance of the synthesized LHTO compound as the SE in LIBs, LiFePO4|LHTO|PEO|Li cells were assembled and tested at 60 ºC. The voltage curves during charging/discharging show a single plateau at ~3.45 V, and no redox behavior of Ti 4+ /Ti 3+ or decomposition of nano-confined pseudowater can be detected, which demonstrates the feasibility of LHTO as the SE for solid-state LIBs (Figure ). Rate performance is further measured, and the results show the specific capacity at 0.1 C is close to the theoretical specific capacity of LiFePO4 (170 mAh g -1 ). With increasing current density, the specific capacity is 144 mAh g -1 at 0.5 C, and 135 mAh g -1 at 1.0 C (Figure ). Even at a high rate of 2.0 C, the battery can still deliver 58% of the theoretical specific capacity. Then the battery is cycled at 1.0 C for 200 cycles. The cell can retain 98% of its initial capacity at the 200 th cycle (Figure ). The Coulombic efficiency of the first cycle is 99.4%, and the average Coulombic efficiency during the 200 cycles is 99.8%. These results demonstrate that the LHTO can be used as a SE in solid-state LIBs.