| Autor: |
Xu, Jia, Galib, Musanna, Wu, Zhenrui, Tao, Li, Shao, Yijia, Zhang, Yue, Guo, Xiaolong, Hansen, Evan J., Chen, Yujin, Wang, Zhenbo, Liu, Chang, Ponga, Mauricio, Liu, Jian |
| Zdroj: |
Nano Energy; December 2024, Vol. 132 Issue: 1 |
| Abstrakt: |
Aqueous zinc-ion batteries are pivotal contributors to the global energy transformation. Cathode materials with NASICON-type structures are promising candidates for zinc-ion batteries but are hindered by their low electrical conductivity, sluggish ionic diffusion, and structural instability. This work introduces a high-entropy, carbon-coated NASICON-type Na3V2(PO4)2F3(HE-NVPF@C) cathode by incorporating five metal elements (Al, Zn, Mn, Cr, and Nb) mainly into the V sites of the VO4F2octahedral structure. Systematic experimental and simulation studies of the Zn2+storage mechanism in high-entropy NASICON-type cathode are presented for the first time. The high-entropy doping strategy contributes to significantly enhanced cycling stability by suppressing Jahn-Teller distortion, reducing lattice change during Zn2+extraction and insertion, and decreasing the Zn2+migration energy barrier. As a result, the HE-NVPF@C cathode demonstrates exceptional cycling stability over 6000 cycles at 20 C with a capacity loss of a mere 0.0031 % per cycle and a high areal capacity retention of 2.17 mAh cm−2. In addition, the pouch cell provides a long cycling lifespan with 90.8 % capacity retention at 5 C after 200 cycles. This feasible high-entropy approach broadens the perspective for developing practical zinc-ion batteries with a long cycle lifespan and high areal capacity. |
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