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Dynamic compensation of MnOOH to mitigate the irregular dissolution of MnO2 in rechargeable aqueous Zn/MnO2 batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-06-21 , DOI: 10.1039/d3ta02202a Guojun Lai 1 , Pengchao Ruan 1 , Xueting Hu 1 , Bingan Lu 2 , Shuqiang Liang 1 , Yan Tang 1 , Jiang Zhou 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-06-21 , DOI: 10.1039/d3ta02202a Guojun Lai 1 , Pengchao Ruan 1 , Xueting Hu 1 , Bingan Lu 2 , Shuqiang Liang 1 , Yan Tang 1 , Jiang Zhou 1
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As a recognized promising cathode material for rechargeable aqueous Zn batteries, an MnO2 cathode often suffers from rapid fading of capacity due to irreversible Mn dissolution, which hinders high-performance Zn batteries. Herein, we introduced Ce(SO4)2 additives into the electrolyte of Zn/MnO2 batteries to cope with the irreversible dissolution of MnO2. During charging, the MnOOH formed by the reaction between Ce4+ and Mn2+ deposited on the cathode with the attraction of H+ and was converted subsequently to MnO2 to achieve dynamic compensation. Meanwhile, MnOOH was generated from the transformation of MnO2 during discharge, and the reaction between Ce3+ and MnOOH was beneficial for the reversibility of Ce4+, but also competitive with the disproportionation of MnOOH. As a result, Zn/MnO2 batteries with Ce(SO4)2 additives showed high capacity retention of 97.4% at 1.0 A g−1 after 1000 cycles, which far exceeded that of the batteries without Ce(SO4)2 (40.5%).
中文翻译：
MnOOH 的动态补偿可减轻可充电水性 Zn/MnO2 电池中 MnO2 的不规则溶解
作为公认的有前景的可充电水系锌电池正极材料，MnO 2正极经常因不可逆的锰溶解而导致容量快速衰减，这阻碍了高性能锌电池的发展。在此，我们将Ce(SO 4 ) 2添加剂引入到Zn/MnO 2电池的电解液中以应对MnO 2的不可逆溶解。充电过程中，Ce 4+和Mn 2+反应形成的MnOOH在H +的吸引下沉积在正极上，随后转化为MnO 2，实现动态补偿。同时，MnO转化生成MnOOH放电过程中Ce 3+与MnOOH的反应如图2所示，Ce 3+ 与MnOOH的反应有利于Ce 4+的可逆性，同时也与MnOOH的歧化反应竞争。结果表明，添加Ce(SO 4 ) 2的Zn/MnO 2电池在1.0 A g -1下循环1000次后容量保持率高达97.4% ，远远超过不含Ce(SO 4 ) 2的电池（40.5%%）。
更新日期：2023-06-21
中文翻译：
MnOOH 的动态补偿可减轻可充电水性 Zn/MnO2 电池中 MnO2 的不规则溶解
作为公认的有前景的可充电水系锌电池正极材料，MnO 2正极经常因不可逆的锰溶解而导致容量快速衰减，这阻碍了高性能锌电池的发展。在此，我们将Ce(SO 4 ) 2添加剂引入到Zn/MnO 2电池的电解液中以应对MnO 2的不可逆溶解。充电过程中，Ce 4+和Mn 2+反应形成的MnOOH在H +的吸引下沉积在正极上，随后转化为MnO 2，实现动态补偿。同时，MnO转化生成MnOOH放电过程中Ce 3+与MnOOH的反应如图2所示，Ce 3+ 与MnOOH的反应有利于Ce 4+的可逆性，同时也与MnOOH的歧化反应竞争。结果表明，添加Ce(SO 4 ) 2的Zn/MnO 2电池在1.0 A g -1下循环1000次后容量保持率高达97.4% ，远远超过不含Ce(SO 4 ) 2的电池（40.5%%）。
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