Conversion-Type Nonmetal Elemental Tellurium Anode with High Utilization for Mild/Alkaline Zinc Batteries
Conversion-Type Nonmetal Elemental Tellurium Anode with High Utilization for Mild/Alkaline Zinc Batteries
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DOI：
10.1002/adma.202105426
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发表时间：
2021-10-15
影响因子：
29.4
通讯作者：
Zhi, Chunyi
中科院分区：
文献类型：
--
作者：
Chen, Ze;Li, Chuan;Zhi, Chunyi
锌离子电池（ZIB）通常建立在过量的金属Zn阳极和水性电解质上，在Zn侧遭受严重的枝晶和析气问题，导致循环寿命差。用非锌金属阳极代替锌金属阳极是解决这些问题的一个很有前途的策略，但这仍然受到有限的阳极替代品的限制。本文中，通过用硫族元素碲（Te）代替金属Zn，报道了可以在温和和碱性电解质中工作的转化型基于Te的ZIB。正如预期的那样，组装的温和Te/MnO 2和碱性Te/Ni（OH）（2）电池分别提供高达106和161 mAh g（阳极+阴极）（-1）的显著容量，具有高的阳极利用率（Te/MnO 2的50.1%和Te/Ni（OH）（2）的38.9%），其超过所有ZIB。超长的循环寿命（超过75%的容量保持5000次循环后）是在两个系统中实现的，受益于稳定的转换机制（温和：Te到ZnTe 2到ZnTe;碱性：ZnTe到Te到TeO 2）与彻底消除枝晶和析气。此外，还实现了ZIB的高重量能量密度，其分别为176.3Wh/kg（阳极+阴极）（-1）（Te/Ni（OH）（2））和81 Wh/Kg（阳极+阴极）（-1）（Te/MnO 2）。本工作为开发具有上级稳定性的高性能电池的先进转化型阳极提供了参考。
Zinc ion batteries (ZIBs), generally established on an excessive metallic Zn anode and aqueous electrolytes, suffer from severe dendrites and gassing issues at Zn side, resulting in poor cycling life. Substituting Zn metal anode with non-Zn ones is a promising strategy for solving these problems, whereas this is still restricted by the limited anode alternatives. Herein, by replacing metal Zn with chalcogen element tellurium (Te), a conversion-type Te-based ZIB is reported that can work in both mild and alkaline electrolytes. As expected, the as-assembled mild Te/MnO2 and alkaline Te/Ni(OH)(2) cells deliver remarkable capacities up to 106 and 161 mAh g(anode+cathode)(-1), respectively, with a high utilization of anode (50.1% for the Te/MnO2 and 38.9% for the Te/Ni(OH)(2)), which surpass all ZIBs. Ultralong cycling life (over 75% capacity retention after 5000 cycles) is achieved in the two systems, benefiting from the stable conversion mechanisms (mild: Te to ZnTe2 to ZnTe; alkaline: ZnTe to Te to TeO2) with thoroughly eliminated dendrites and gassing. Moreover, high gravimetric energy density of ZIBs is also achieved, which are 176.3 Wh kg(anode+cathdoe)(-1) (Te/Ni(OH)(2)) and 81 Wh Kg(anode+cathode)(-1) (Te/MnO2), respectively. This work sheds light on the development of advanced conversion-type anode for high-performance batteries with superior stability.