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Highly Reversible Aqueous Zn‐MnO 2 Battery by Supplementing Mn 2+ ‐Mediated MnO 2 Deposition and Dissolution
Author(s) -
Shen Xiaofan,
Wang Xiaona,
Zhou Yurong,
Shi Yanhong,
Zhao Liming,
Jin Hehua,
Di Jiangtao,
Li Qingwen
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202101579
Subject(s) - dissolution , cathode , materials science , electrolyte , aqueous solution , battery (electricity) , chemical engineering , redox , disproportionation , intercalation (chemistry) , deposition (geology) , electrochemistry , inorganic chemistry , electrode , metallurgy , chemistry , paleontology , power (physics) , physics , quantum mechanics , sediment , engineering , biology , biochemistry , catalysis
Rechargeable Zn‐MnO 2 batteries are boosted by the reversible intercalation reactions in mild aqueous electrolytes, but they still suffer from cathode degradation. Herein, Zn‐MnO 2 batteries with high durability and high energy density are achieved by supplementing MnO 2 deposition and dissolution in a mild aqueous electrolyte. The main finding is that adjusting Mn 2+ concentration to a critical range enables a reversible MnO 2 /Mn 2+ redox conversion without the involvement of oxygen evolution. This can recycle the by‐products from MnOOH disproportionation (MnOOH → MnO 2 + Mn 2+ ), resulting in a battery with extremely high durability (16 000 cycles without obvious capacity fading), high energy density (602 Wh kg −1 based on the active mass of the cathode), and high‐rate capacity (430 mAh g −1 at 19.5 A g −1 ). The utilization of a 3D carbon nanotube foam skeleton can accommodate the volume change during MnO 2 deposition/dissolution and provide paths for efficient charge and mass transport. This work provides a feasible way to push the development of Zn‐MnO 2 batteries in mild aqueous electrolytes.