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Toward flexible zinc-ion hybrid capacitors with superhigh energy density and ultralong cycling life: the pivotal role of ZnCl2 salt-based electrolytes.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-23 , DOI: 10.1002/anie.202012030 Cheng Wang 1 , Zengxia Pei 1 , Qiangqiang Meng 2 , Chunmei Zhang 3 , Xiao Sui 1 , Ziwen Yuan 1 , Sijie Wang 1 , Yuan Chen 1
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-23 , DOI: 10.1002/anie.202012030 Cheng Wang 1 , Zengxia Pei 1 , Qiangqiang Meng 2 , Chunmei Zhang 3 , Xiao Sui 1 , Ziwen Yuan 1 , Sijie Wang 1 , Yuan Chen 1
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Zinc ion hybrid capacitors (ZIHCs) are promising energy storage devices for emerging flexible electronics, but they still suffer from trade‐off in energy density and cycling life. Herein, we show that such a dilemma can be well‐addressed by deploying ZnCl2 based electrolytes. Combining experimental studies and density functional theory (DFT) calculations, for the first time, we demonstrate an intriguing chloride ion (Cl−) facilitated desolvation mechanism in hydrated [ZnCl]+(H2O)n−1 (with n=1–6) clusters. Based on this mechanism, a water‐in‐salt type hydrogel electrolyte filled with ZnCl2 was developed to concurrently improve the energy storage capacity of porous carbon materials and the reversibility of Zn metal electrode. The resulting ZIHCs deliver a battery‐level energy density up to 217 Wh kg−1 at a power density of 450 W kg−1, an unprecedented cycling life of 100 000 cycles, together with excellent low‐temperature adaptability and mechanical flexibility.
中文翻译：
迈向具有超高能量密度和超长循环寿命的柔性锌离子混合电容器：ZnCl2盐基电解质的关键作用。
锌离子混合电容器（ZIHC）是新兴的柔性电子产品中很有希望的储能设备，但它们在能量密度和循环寿命方面仍需权衡取舍。在这里，我们表明，通过部署基于ZnCl 2的电解质可以很好地解决这一难题。结合实验研究和密度泛函理论（DFT）计算，对于第一次，我们证明一个有趣的氯离子（CL - ）的水合促进去溶剂化机制[氯化锌] +（H 2 O）n-1个（其中n = 1- 6）集群。基于此机理，制成了填充有ZnCl 2的盐包水型水凝胶电解质为了同时提高多孔碳材料的储能能力和Zn金属电极的可逆性而开发的产品。最终的ZIHC在450 W kg -1的功率密度下可提供高达217 Wh kg -1的电池级能量密度，前所未有的10万次循环寿命，以及出色的低温适应性和机械柔韧性。
更新日期：2020-09-23
中文翻译：
迈向具有超高能量密度和超长循环寿命的柔性锌离子混合电容器：ZnCl2盐基电解质的关键作用。
锌离子混合电容器（ZIHC）是新兴的柔性电子产品中很有希望的储能设备，但它们在能量密度和循环寿命方面仍需权衡取舍。在这里，我们表明，通过部署基于ZnCl 2的电解质可以很好地解决这一难题。结合实验研究和密度泛函理论（DFT）计算，对于第一次，我们证明一个有趣的氯离子（CL - ）的水合促进去溶剂化机制[氯化锌] +（H 2 O）n-1个（其中n = 1- 6）集群。基于此机理，制成了填充有ZnCl 2的盐包水型水凝胶电解质为了同时提高多孔碳材料的储能能力和Zn金属电极的可逆性而开发的产品。最终的ZIHC在450 W kg -1的功率密度下可提供高达217 Wh kg -1的电池级能量密度，前所未有的10万次循环寿命，以及出色的低温适应性和机械柔韧性。
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