Abstract
Phosphate cathode materials have a stable and open backbone structure and are expected to be one of the ideal cathode materials for aqueous zinc ion batteries (ZIBs). In this work, a new compound Na3Ti0.8V1.2(PO4)3 is synthesised by sol-gel method and used as a cathode material for ZIBs. The battery delivered a reversible and stable capacity of 120.1 mA h g−1 over 100 cycles at 0.5 C. Impressively, the battery demonstrated exceptional cycling performance and outstanding rate performance, maintaining a capacity retention of 95.6 % after 1000 cycles at 5.0 C. It is demonstrated that the dissolution of V in water is effectively inhibited by partial Ti ion occupancy at the V site, which accelerates the ion diffusion rate and greatly improves the electrochemical performance. In this work, the charging and discharging process of NASICON structured Na3Ti0.8V1.2(PO4)3 cathode was investigated to show the mechanism of Na+ and Zn2+ co-doping. This discovery offers a novel phosphate cathode material for ZIBs, as well as a fresh approach to enhancing the specific capacity and stability of phosphate cathode materials.
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