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Precise Proton Redistribution for Two-Electron Redox in Aqueous Zinc/Manganese Dioxide Batteries
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2021-09-15 , DOI: 10.1002/aenm.202102055
Zhaoxi Shen 1 , Ziqing Tang 1 , Chaowei Li 1 , Lei Luo 1 , Jun Pu 1 , Zhaorui Wen 1 , Yu Liu 1 , Yu Ji 1 , Junpeng Xie 1 , Litong Wang 1 , Yagang Yao 2, 3 , Guo Hong 1, 4
Affiliation  

The liquid electrolyte in conventional zinc/manganese dioxide (Zn/MnO2) batteries conduces to the capacity limitation of one-electron redox from MnO2 to MnOOH, as well as undesired Mn loss with capacity deterioration. Herein, to conquer these challenges, a new idea is proposed on the precise proton redistribution in the hydrogel electrolyte for the preferred two-electron redox reaction. Specifically, an acidic layer in the hydrogel adjoins the MnO2 cathode to maintain the two-electron redox, a neutral layer adjoins the zinc anode to inhibit the dendrite growth, which is separated by a mildly alkaline layer to immobilize the proton distribution. The two-electron redox of MnO2/Mn2+ and anode protection are demonstrated to play key roles in battery performance. Such a battery presents specific capacities of 516 mA h g−1 at 0.05 A g−1, as well as a capacity retention of 93.18% at 5 A g−1 after 5000 cycles without extra Mn2+ addition in the electrolyte. More importantly, fibrous Zn/MnO2 batteries using the tri-layer electrolyte can sustain 2000 cycles with high initial capacity of 235 mAh g−1 at 1 A g−1. After 6000 times folding in 180°, it can maintain 99.54% capacity. When integrated into user's clothing or portable accessories, the fibrous battery is demonstrated as a great potential in wearable electronics.

中文翻译:

水性锌/二氧化锰电池中双电子氧化还原的精确质子再分布

传统锌/二氧化锰 (Zn/MnO 2 ) 电池中的液体电解质导致从 MnO 2到 MnOOH的单电子氧化还原的容量限制,以及不希望的 Mn 损失和容量劣化。在此,为了克服这些挑战,提出了一种关于在水凝胶电解质中精确质子重新分布的新想法,用于优选的双电子氧化还原反应。具体而言,水凝胶中的酸性层与 MnO 2阴极相邻以维持双电子氧化还原,中性层与锌阳极相邻以抑制枝晶生长,其被弱碱性层隔开以固定质子分布。MnO 2 /Mn 2+的双电子氧化还原和阳极保护被证明在电池性能中起着关键作用。这种电池在 0.05 A g -1 时的比容量为 516 mA hg -1,并且在 5000 次循环后在 5 A g -1 时的容量保持率为 93.18%,而无需在电解液中添加额外的 Mn 2+。更重要的是,使用三层电解质的纤维状 Zn/MnO 2电池可以在 1 A g -1 下以 235 mAh g -1 的高初始容量维持 2000 次循环。180°折叠6000次后,仍可保持99.54%的容量。当集成到用户的衣服或便携式配件中时,纤维电池在可穿戴电子产品中显示出巨大的潜力。
更新日期:2021-11-04
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