Capacity Revival of Tungsten trioxide Anode Material in Lithium-Ion Battery

摘要

Transitional Metal Oxides (TMOs) has been considered as one of the promising candidates for anode materials in Lithium-ion batteries (LIBs) due to their high theoretical capacities. However, low electronic conductivity, volume expansion during discharge/charge cycles and poor rate capability challenges its further use in LIBs. In this work, unique behavior of self-revival in the capacity with cycling is presented. Self-revival in the capacity was attained by doping pristine tungsten trioxide (WO₃) with nitrogen at high temperature. The percentage increase of self-revived discharge capacity corresponding to the preceding discharge capacity at cycles, 9^th (412.85 Vs 370.95 mAhg^-1), 13^th (405.24 Vs 390.95 mAhg^-1) and 36^th (552.38 Vs 138.57 mAhg^-1) cycles were 11.29%, 3.65% and 298.63%, respectively. This interesting phenomenon of self-capacity revival can be attributed to the reduction in the particle size of WO₃ that leads to high surface area. In addition, the created oxygen vacancies and defects make the reduced WO₃ electrochemically active and enhance the catalytic activity.