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229. An Environment‐Friendly High‐Performance Aqueous Mg‐Na Hybrid‐Ion Battery Using an Organic Polymer Anode.

Author

Zhang, Shengnan, Zhao, Chunlin, Zhu, Kai, Zhao, Jiaqi, Gao, Yinyi, Ye, Ke, Yan, Jun, Wang, Guiling, and Cao, Dianxue

Subjects
POLYMER electrodes, ANODES, ENERGY storage, POLYMERS, CARBONYL group
Abstract

Aqueous Mg ion batteries (AMIBs) show great potential in energy storage for their advantages of high capacity, abundant resource, and environmental friendliness. However, the development of AMIBs is limited due to the scarcity of suitable anode materials. In this study, a new polymer anode material (PNTAQ) with flower‐like nanosheet structure is synthesized for aqueous Mg‐Na hybrid‐ion battery (AMNHIB). PNTAQ possess carbonyl functional groups which can be oxidized and reduced reversibly in aqueous solution containing alkaline metal ions. PNTAQ displays a discharge specific capacity of 245 mAh g−1 at 50 mA g−1 in 1 M MgCl2 + 0.5 M NaCl electrolyte, which is much higher than that in single 1 M MgCl2 or 0.5 M NaCl electrolyte. Even cycling at 1000 mA g−1 for 1000 times, the capacity retention can still maintain at 87.2%. A full Mg‐Na hybrid‐ion cell is assembled by employing β‐MnO2 as cathode and PNTAQ as anode material, it exhibits a specific capacity of 91.6 mAh g−1 at 100 mA g−1. The polymer electrode material well maintains its framework structure during the discharge/charge cycling process of the hybrid‐ion battery. [ABSTRACT FROM AUTHOR]

Published
2023
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231. Boosting Magnesium Ion Storage Behavior via Heteroelement Doping in a Porous Tunnel Framework Cathode for Aqueous Mg‐Ion Batteries.

Author

Li, Zhuo, Chen, Yuanyuan, Gong, Zhe, Liu, Yang, Wang, Guiling, Gao, Yinyi, Zhu, Kai, and Cao, Dianxue

Subjects
POTASSIUM ions, MAGNESIUM ions, ENERGY storage, CATHODES, WATER tunnels, FOSSIL fuels
Abstract

To relieve the overwhelming pressure on fossil energy, aqueous magnesium ion batteries attracted tremendous attention owing to their low cost and high safety. However, the cathode materials are apt to occur lattice distortion because of the electrostatic interaction between magnesium ions and crystal. The 2×2 manganese octahedral molecular sieve with potassium ions and water located in the tunnels (K‐OMS‐2), utilized as a cathode material for chargeable magnesium ions batteries, is exposed to irreversible Mg2+ intercalation/deintercalation due to lattice distortion, which heavily damages the electrochemical properties and declines the capacity. Herein, we carry out an ion doping strategy to overcome the above issues, leading to an enhanced Mg Mg2+ storage behavior. The Nb or V cation is successfully doped into K‐OMS‐2 by a facile reflux method under room temperature. The specific surface area is enlarged by the addition of cations, which promise a large electrode‐electrolyte contact area. The Nb and V doped K‐OMS‐2 present a capacity of 252.6 and 265.9 mAh/g at 20 mA/g, respectively. This work demonstrates an ion doping approach toward exploiting the stable and high‐capacity Mg‐ion battery cathode and provides potential cathode materials for a large‐scale aqueous Mg‐ion‐based energy storage system. [ABSTRACT FROM AUTHOR]

Published
2023
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