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A High‐Energy Aqueous Manganese–Metal Hydride Hybrid Battery
Author(s) -
Yang Meng,
Chen Ru,
Shen Yinlin,
Zhao Xiangyu,
Shen Xiaodong
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202001106
Subject(s) - materials science , cathode , anode , separator (oil production) , battery (electricity) , manganese , aqueous solution , hydride , electrochemistry , energy storage , chemical engineering , dissolution , hydrogen storage , inorganic chemistry , alloy , hydrogen , electrode , metal , metallurgy , chemistry , organic chemistry , power (physics) , physics , quantum mechanics , thermodynamics , engineering
Aqueous rechargeable batteries show great application prospects in large‐scale energy storage because of their reliable safety and low cost. However, a key challenge in developing this battery system lies in its low energy density. Herein, a high‐energy manganese–metal hydride (Mn–MH) hybrid battery is reported in which a Mn‐based cathode operated by the Mn 2+ /MnO 2 deposition–dissolution reactions, a hydrogen‐storage alloy anode that absorbs and desorbs hydrogen in an alkaline solution, and a proton‐exchange membrane separator are employed. Given the benefit derived from the high solubility and high specific capacity of the Lewis acidic MnCl 2 in the cathode and the low electrode potential of the MH anode, this aqueous Mn–MH hybrid battery exhibits impressive electrochemical properties with admirable discharge voltage plateaus up to 2.2 V, a competitive energy density of about 240 Wh kg −1 (based on the total mass of the 5.5 m MnCl 2 solution and the hydrogen storage alloy electrode system), good cycling stability over 130 cycles, and a desirable rate capability. This work demonstrates a new strategy for achieving high‐performance and low‐cost aqueous rechargeable batteries.