Liyf4 Crystals Embedded Silicate Glass with High Electrochemical Performance as an Anode for Lithium-Ion Battery

To compensate for the loss of irreversible capacity of lithium-ion battery, the silicate glass-ceramic containing LiYF4 crystals (YLFGC) is prepared by melting-annealing and then used as an active material to improve this situation. At the current density of 50 mA g-1, the specific capacity is 319.2 mAh g-1 while the efficiency is 99.4%. LiYF4 crystals provide more sites for the lithium-ion storage, on the other hand, it plays a synergistic effect with the disordered glass to promote the intercalation/deintercalation of lithium-ion. At the current density with 1 A g-1, there occurs an obvious phenomenon of capacity recovery from ca. 100 mAh g-1 to 200 mAh g-1 and finally stabilizes at 178 mAh g-1 with the efficiency stabilizing at 99 %, and the cycling stability of the anode is enhanced by the presence of LiYF4 crystals. This study provides a new material for improving the performance of anode for lithium-ion battery