Improved electrochemical performance of amorphous TiS₃ electrodes compared to its crystal for all-solid-state rechargeable lithium batteries

抄録

Crystalline and amorphous TiS₃ active materials were prepared. The all-solid-state lithium secondary batteries with crystalline and amorphous TiS₃ showed the initial discharge capacity of about 560 mAh g⁻¹, corresponding to the theoretical capacity of TiS₃. However, the battery using crystalline TiS₃ had an irreversible capacity at the 1st cycle. The battery showed the reversible capacity of about 400 mAh g⁻¹ from the 2nd to 10th cycle. On the other hand, irreversible capacities were not observed for 10 cycles in the battery with amorphous TiS₃. The structural changes of crystalline and amorphous TiS₃ were observed by XRD and HR-TEM during cycling. Crystalline TiS₃ became partially amorphous during the cycling. Amorphous TiS₃ maintained amorphous state for 10 cycles and thus had the better cyclability compared to crystalline TiS₃.