Phase engineering and heteroatom incorporation enable defect-rich MoS2 for long life aqueous iron-ion batteries
Xinyu Guo, Chang Li, Wenjun Deng, Yi Zhou, Yan Chen, Yushuang Xu, Rui Li
Abstract
Aqueous iron-ion batteries are regarded as one of the most promising candidates for grid applications owing to their low cost, high theoretical capacity, and excellent stability of iron in aqueous electrolytes . However, the slow Fe (de)insertion caused by the high polarity of Fe 2+ makes it difficult to match suitable cathode materials . Herein, defect-rich MoS 2 with abundant 1T phase is synthesized and successfully applied in aqueous iron-ion batteries. Benefit from abundant active sites generated by the heteroatom incorporation and S vacancy , as well as the highly conductive 1T phase, it can deliver a specific capacity of 123 mAh/g at a current density of 100 mA/g, and demonstrates an impressive capacity retention of 88% after 600 cycles at 200 mA/g. This work presents a novel pathway for the advancement of cathode materials for aqueous iron-ion batteries.