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A highly reversible neutral zinc/manganese battery for stationary energy storage
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/17 , DOI: 10.1039/c9ee03702k Congxin Xie 1, 2, 3, 4, 5 , Tianyu Li 1, 2, 3, 4, 5 , Congzhi Deng 6, 7, 8 , Yang Song 1, 2, 3, 4, 5 , Huamin Zhang 1, 2, 3, 4, 5 , Xianfeng Li 1, 2, 3, 4, 5
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/17 , DOI: 10.1039/c9ee03702k Congxin Xie 1, 2, 3, 4, 5 , Tianyu Li 1, 2, 3, 4, 5 , Congzhi Deng 6, 7, 8 , Yang Song 1, 2, 3, 4, 5 , Huamin Zhang 1, 2, 3, 4, 5 , Xianfeng Li 1, 2, 3, 4, 5
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Manganese (Mn) based batteries have attracted remarkable attention due to their attractive features of low cost, earth abundance and environmental friendliness. However, the poor stability of the positive electrode due to the phase transformation and structural collapse issues has hindered their validity for rechargeable batteries. Here we presented a highly reversible and stable two electron transfer solid–liquid reaction based on MnO2 and soluble Mn(CH3COO)2(Mn(Ac)2) under neutral medium. Benefiting from the coordination effect of Ac−, the Mn2+ can directly deposit on the electrode in the form of MnO2, which is completely different from other manganese salts (MnSO4 or MnCl2). Compared with the common intercalation mechanism cathode, the dissolution/deposition reaction completely avoided the structure collapse issue, which results in a dramatic improvement in stability. Furthermore, in contrast to the redox pair of Mn3+/Mn2+, the intrinsic problems caused by the disproportionation of Mn3+ can be totally avoided. The proof of concept can be confirmed by a neutral Zn–Mn flow battery with an optimized electrolyte. The MnO2 could be perfectly deposited on the graphite fiber with an areal capacity of 20 mA h cm−2, which is the highest value ever reported. Unlike the alkaline electrolytes, a neutral flow system can effectively avoid the zinc dendrite issues. As a result, a Zn–Mn flow battery demonstrated a CE of 99% and an EE of 78% at 40 mA cm−2 with more than 400 cycles. Combined with excellent electrochemical reversibility, low cost and two-electron transfer properties, the Zn–Mn battery can be a very promising candidate for large scale energy storage.
中文翻译：
高度可逆的中性锌/锰电池，用于固定式能量存储
锰（Mn）基电池因其具有低成本，丰富的地球资源和环境友好的吸引人的特性而备受关注。然而，由于相变和结构塌陷问题而导致的正极的较差的稳定性阻碍了它们对可再充电电池的有效性。在这里，我们介绍了一种在中性介质下基于MnO 2和可溶性Mn（CH 3 COO）2（Mn（Ac）2）的高度可逆和稳定的两电子转移固液反应。从AC的协同效应受益- ，使Mn 2+可直接在电极上沉积以MnO形式2，这与其他锰盐（MnSO 4或MnCl 2）完全不同。与普通的插层机理阴极相比，溶解/沉积反应完全避免了结构塌陷问题，从而大大提高了稳定性。此外，与Mn 3+ / Mn 2+的氧化还原对相反，可以完全避免由Mn 3+歧化引起的内在问题。可以通过具有优化电解液的中性Zn-Mn液流电池来证实概念验证。MnO 2可以以20 mA h cm -2的面积容量完美地沉积在石墨纤维上，这是有史以来的最高值。与碱性电解质不同，中性流动系统可以有效避免锌枝晶问题。结果，Zn-Mn液流电池在40 mA cm -2下具有400多个循环，显示出99％的CE和78％的EE 。结合出色的电化学可逆性，低成本和两电子转移特性，Zn-Mn电池可以成为大规模储能的非常有前途的候选者。
更新日期：2020-02-13
中文翻译：
高度可逆的中性锌/锰电池，用于固定式能量存储
锰（Mn）基电池因其具有低成本，丰富的地球资源和环境友好的吸引人的特性而备受关注。然而，由于相变和结构塌陷问题而导致的正极的较差的稳定性阻碍了它们对可再充电电池的有效性。在这里，我们介绍了一种在中性介质下基于MnO 2和可溶性Mn（CH 3 COO）2（Mn（Ac）2）的高度可逆和稳定的两电子转移固液反应。从AC的协同效应受益- ，使Mn 2+可直接在电极上沉积以MnO形式2，这与其他锰盐（MnSO 4或MnCl 2）完全不同。与普通的插层机理阴极相比，溶解/沉积反应完全避免了结构塌陷问题，从而大大提高了稳定性。此外，与Mn 3+ / Mn 2+的氧化还原对相反，可以完全避免由Mn 3+歧化引起的内在问题。可以通过具有优化电解液的中性Zn-Mn液流电池来证实概念验证。MnO 2可以以20 mA h cm -2的面积容量完美地沉积在石墨纤维上，这是有史以来的最高值。与碱性电解质不同，中性流动系统可以有效避免锌枝晶问题。结果，Zn-Mn液流电池在40 mA cm -2下具有400多个循环，显示出99％的CE和78％的EE 。结合出色的电化学可逆性，低成本和两电子转移特性，Zn-Mn电池可以成为大规模储能的非常有前途的候选者。
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