Achieving High-Voltage and High-Capacity Aqueous Rechargeable Zinc Ion Battery by Incorporating Two-Species Redox Reaction
Achieving High-Voltage and High-Capacity Aqueous Rechargeable Zinc Ion Battery by Incorporating Two-Species Redox Reaction
复制标题
DOI：
10.1002/aenm.201902446
复制
发表时间：
2019-10-25
影响因子：
27.8
通讯作者：
Zhi, Chunyi
中科院分区：
文献类型：
--
作者：
Ma, Longtao;Chen, Shengmei;Zhi, Chunyi
本文提出了Co(II)/Co（III）和Fe(II)/Fe（III）掺入六氰高铁酸钴（CoFe(CN)6）中的两种氧化还原反应，作为实现高容量高压水基锌离子电池的突破口。利用Co(II)/Co（III）和Fe(II)/Fe（III）对的两种氧化还原反应，Zn/CoFe(CN)6电池在0.3 ag（-1）电流密度下提供了1.75 V （vs金属Zn）的高工作电压平台和173.4 mAh g（-1）的高容量。即使在6 A g（-1）的极快充放电速率下，该电池凭借其3D开放式结构框架也能提供109.5 mAh g（-1）的足够高的放电容量。这是迄今为止所有使用普鲁士蓝类似物（PBAs）阴极的电池中提供的最高容量。此外，Zn/CoFe(CN)6电池在2200次循环中没有任何容量衰减，库仑效率接近100%。在此基础上，提出了水凝胶电解质的溶胶-凝胶过渡策略，以构建高性能柔性电缆型电池。通过该策略，活性材料可以充分与电解质接触，从而提高了固态器件的电化学性能（容量增加约18.73%）和机械稳健性。认为本研究通过引入多种氧化还原反应物质对高压大容量电池电极进行了优化。
Herein, a two-species redox reaction of Co(II)/Co(III) and Fe(II)/Fe(III) incorporated in cobalt hexacyanoferrate (CoFe(CN)6) is proposed as a breakthrough to achieve jointly high-capacity and high-voltage aqueous Zn-ion battery. The Zn/CoFe(CN)6 battery provides a highly operational voltage plateau of 1.75 V (vs metallic Zn) and a high capacity of 173.4 mAh g(-1) at current density of 0.3 A g(-1), taking advantage of the two-species redox reaction of Co(II)/Co(III) and Fe(II)/Fe(III) couples. Even under extremely fast charge/discharge rate of 6 A g(-1), the battery delivers a sufficiently high discharge capacity of 109.5 mAh g(-1) with its 3D opened structure framework. This is the highest capacity delivered among all the batteries using Prussian blue analogs (PBAs) cathode up to now. Furthermore, Zn/CoFe(CN)6 battery achieves an excellent cycling performance of 2200 cycles without any capacity decay at coulombic efficiency of nearly 100%. One further step, a sol-gel transition strategy for hydrogel electrolyte is developed to construct high-performance flexible cable-type battery. With the strategy, the active materials can adequately contact with electrolyte, resulting in improved electrochemical performance (approximate to 18.73% capacity increase) and mechanical robustness of the solid-state device. It is believed that this study optimizes electrodes by incorporating multi redox reaction species for high-voltage and high-capacity batteries.