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Electrochemical Activation of Manganese‐Based Cathode in Aqueous Zinc‐Ion Electrolyte
Author(s) -
Zhang Tengsheng,
Tang Yan,
Fang Guozhao,
Zhang Chenyang,
Zhang Hongliang,
Guo Xun,
Cao Xinxin,
Zhou Jiang,
Pan Anqiang,
Liang Shuquan
Publication year - 2020
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.202002711
Subject(s) - electrolyte , electrochemistry , manganese , materials science , zinc , cathode , battery (electricity) , inorganic chemistry , electrode , electrochemical window , aqueous solution , chemical engineering , chemistry , metallurgy , ionic conductivity , power (physics) , physics , quantum mechanics , engineering
Low‐cost and highly safe zinc‐manganese batteries are expected for practical energy storage and grid‐scale application. The electrolyte adjustment is further combined to boost their performance output; however, the mechanism behind the electrochemical contrast caused by electrolyte composition remains unclear, which has held back the development of these systems. Hence, new insight into the electrochemical activation of manganese‐based cathodes, which is induced by the aqueous zinc‐ion electrolyte, is provided. The relationship between the desolvation of Zn 2+ from [Zn(OH 2 ) 6 ] 2+ ‐solvation shell and the electrolyte/electrode interfacial reaction to form Zn 4 SO 4 (OH) 6 ·4H 2 O phase or its analogues is established, which is the key for the electrochemical activation. Further electrolyte optimization promotes the cycling stability of Zn/LiMn 2 O 4 battery with a long life span over 2000 cycles. This work illuminates the confused direction in exploring electrolyte for zinc‐manganese batteries.