Hydrated lithium ions intercalated V2O5 with dual-ion synergistic insertion mechanism for high-performance aqueous zinc-ion batteries
2022
Tong, Yunxiao | Li, Xiaoman | Su, Senda | Li, Jinzhen | Fang, Junzhuo | Liang, Bin | Hou, Jianhua | Luo, Min
Li₀.₄₅V₂O₅·0.89H₂O (LVO) was successfully synthesized by wet-mixing of LiOH·H₂O and V₂O₅, with subsequent hydrothermal method for the first time. The hydrated lithium ions as the intercalated guest species were inserted into the V₂O₅ interlayer. The as-obtained LVO with a stable lamellar structure, enlarged interlayer space, weak interlayer repulsive force and low molecular weight, which shows a specific capacitance of 403 mAh g⁻¹ at 0.1 A g⁻¹, excellent rate capability and longlifespan with capacity retention of 86% over 1000 cycles at 10 A g⁻¹. Furthermore, the LVO-based AZIBs possess a synergistic insertion mechanism of Zn²⁺ and H⁺, that is the reason for its superior performance. This work provides an efficient design strategy for synthesizing advanced cathode materials for the high-performance Zn²⁺ energy storage system.
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