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Aqueous Zinc-Tellurium Batteries with Ultraflat Discharge Plateau and High Volumetric Capacity.
Advanced Materials ( IF 29.4 ) Pub Date : 2020-09-13 , DOI: 10.1002/adma.202001469
Ze Chen 1 , Qi Yang 1 , Funian Mo 1 , Na Li 1 , Guojing Liang 1 , Xinliang Li 1 , Zhaodong Huang 1 , Donghong Wang 1 , Weichun Huang 2 , Jun Fan 1 , Chunyi Zhi 1, 3
Affiliation  

Traditional aqueous zinc‐ion batteries (ZIBs) based on ion‐intercalation or surface redox behaviors at the cathode side suffer severely from an unsatisfactory specific capacity and unstable output potential. Herein, these issues are applied to a conversion‐type zinc–tellurium (Zn–Te) battery. Typically, this battery works based on a two‐step solid‐to‐solid conversion with the successive formation of zinc ditelluride (ZnTe2) and zinc telluride (ZnTe). It delivers an ultrahigh volumetric capacity of 2619 mAh cm−3 (419 mAh g−1), 74.1% of which is from the first conversion (Te to ZnTe2) with an ultraflat discharge plateau. Though reported first in a challenging aqueous environment, this Zn–Te battery demonstrates an excellent capacity retention of >82.8% after 500 cycles, which results from the elimination of the notorious “shuttle effect” due to the solid‐to‐solid conversion behaviors. In addition, a quasi‐solid‐state Zn–Te battery is also fabricated, exhibiting superior flexibility, robustness, and good electrochemical performance. This work develops a novel cathode material based on conversion‐type ion‐storage mechanism. The system is attractive due to its ultrastable energy output, which is rarely reported for ZIBs.

中文翻译:

具有超平坦放电平台和高容量的锌-碲水电池。

传统的基于离子嵌入或在阴极侧的表面氧化还原行为的水性锌离子电池(ZIB)严重遭受比容量不足和输出电位不稳定的困扰。本文将这些问题应用于转换型锌碲(Zn-Te)电池。通常,该电池基于两步固-固转换,并依次形成二碲化锌(ZnTe 2)和碲化锌(ZnTe)。它具有2619 mAh cm -3(419 mAh g -1)的超高容量,其中74.1%来自于第一次转化(Te到ZnTe 2)具有超平坦的放电平台。尽管首先在具有挑战性的水性环境中进行了报道,但这款Zn-Te电池在500次循环后仍具有出色的容量保持率> 82.8%,这是由于消除了因固-固转化行为而臭名昭著的“穿梭效应”所致。此外,还制造了准固态Zn-Te电池,具有出色的柔韧性,耐用性和良好的电化学性能。这项工作开发了一种基于转换型离子存储机理的新型阴极材料。该系统因其超稳定的能量输出而极具吸引力,而ZIB很少报道。
更新日期:2020-10-20
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