Laser-radiated Tellurium Vacancies Enable High-performance Telluride Molybdenum Anode for Aqueous Zinc-ion Batteries
Laser-radiated Tellurium Vacancies Enable High-performance Telluride Molybdenum Anode for Aqueous Zinc-ion Batteries
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DOI：
10.1016/j.ensm.2022.06.015
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发表时间：
2022-06
影响因子：
20.4
通讯作者：
Yiqun Du;Boya Zhang;Wei Zhou;Rong-Hua Kang;Wenyang Zhang;Huixin Jin;Jiaqi Wan;Jin Qin;Jianxin Zhang;Guowen Chen
中科院分区：
文献类型：
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作者：
Yiqun Du;Boya Zhang;Wei Zhou;Rong-Hua Kang;Wenyang Zhang;Huixin Jin;Jiaqi Wan;Jin Qin;Jianxin Zhang;Guowen Chen
安全且经济实惠的水性锌离子电池（ZIB）非常适合作为锂离子电池的补充。然而，锌阳极在水介质中会遇到严重的枝晶生长，阻碍了 ZIB 的实际应用。在此，我们制备了无金属的水性ZIB，其中激光还原产生的带有碲空位的MoTe1.7作为负极。无金属策略绕过了锌金属的危害，激光辐射的Te空位提高了电极的容量、稳定性、电导率和扩散动力学。激光还原 MoTe1.7 电极具有高可逆容量（0.2 A g–1 时为 338 mAh g–1）和出色的循环稳定性（1 A g–1 时 10,000 次循环后保留率为 96%）。转化化学被证实为 MoTe1.7 电极在水性 ZIB 中的电荷存储机制。正如预期的那样，制成的 MoTe1.7//ZnxMnO2 袋型全电池可提供 137 Wh kg-1 的卓越能量密度（电极水平），高于最先进的无金属 ZIB。软包电池在超过1000次循环中实现了95%的高容量保持率，验证了激光还原MoTe1.7阳极的巨大应用前景。这一发现可能会加速可充电水性 ZIB 的开发进程。
The safe and affordable aqueous zinc-ion batteries (ZIBs) are highly desirable for complementing lithium-ion batteries. Nevertheless, Zn anode encounters severe dendrite growth in aqueous media, impeding the practical implementation of ZIBs. Herein, we prepared the metal-free aqueous ZIBs, where the MoTe1.7with tellurium vacancies from the laser reduction serves as the negative electrode. The metal-free tactics bypass the hazards of Zn metal, and laser-radiated Te vacancies boost capacity, stability, conductivity, and diffusion kinetics of the electrode. The laser-reduced MoTe1.7electrode shows a high reversible capacity (338 mAh g–1at 0.2 A g–1) and outstanding cycling stability (96% retention for 10,000 cycles at 1 A g–1). The conversion chemistry is confirmed as the charge-storage mechanism of the MoTe1.7electrode in aqueous ZIBs. As expected, the as-fabricated MoTe1.7//ZnxMnO2pouch-type full cell delivers a superb energy density (electrode level) of 137 Wh kg–1, higher than those of the state-of-the-art metal-free ZIBs. The high capacity retention of 95% is achieved over 1000 cycles in pouch cells, verifying the enormous application prospect of the laser-reduced MoTe1.7anode. This finding may accelerate the development process of rechargeable aqueous ZIBs.