Manipulating Ion Concentration to Boost Two-Electron Mn~(4+)/Mn~(2+) Redox Kinetics through a Colloid Electrolyte for High-Capacity Zinc Batteries

Xie Xuesong; Fu Hongwei; Fang YunLu BinganZhou JiangLiang Shuquan

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Manipulating Ion Concentration to Boost Two-Electron Mn~(4+)/Mn~(2+) Redox Kinetics through a Colloid Electrolyte for High-Capacity Zinc Batteries

机译：Manipulating Ion Concentration to Boost Two-Electron Mn~(4+)/Mn~(2+) Redox Kinetics through a Colloid Electrolyte for High-Capacity Zinc Batteries

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Aqueous zinc batteries (ZBs) have flourished due to their advantages of low-cost and intrinsically safe water-based electrolytes. However, in the traditional liquid electrolyte, sufficient energy density and efficiency for practical utility have not been realized yet. Here, instead of the use of a strong acid/alkali pH environment to elevate the working voltage in an aqueous solution, an ion concentration/dilution strategy is proposed to trigger the extra deposition/dissolution capacity of the Mn4+/Mn2+ redox reaction in normal Zn/MnO2 batteries. With the precipitation and release of Zn2+ ions during the discharge/charge process, the adjustment of manganese concentration is successfully realized via the reciprocal Zn/Mn ionic exchange rendered by the bentonite colloidal (Ben-colloid) electrolyte. This electrolyte also triggers a self-dissolution/deposition reaction even in the cathode-free system. Consequently, the Zn/MnO2 battery with Ben-colloid electrolyte affords up to 1.7x capacity release (480.7 mAh g(-1)) on average compared with a liquid electrolyte at 0.2 A g(-1), higher capacity retention (94.3% vs 63.6%) after 500 cycles at 1 A g(-1), and good elevated-temperature endurability (up to 80 degrees C). This work opens up a new horizon to improve the energy density of water-based metal ion batteries by the use of a functional electrolyte.

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来源
《Advanced energy materials》 |2022年第5期|2102393.1-2102393.9|共9页
作者
Xie Xuesong; Fu Hongwei; Fang YunLu BinganZhou JiangLiang Shuquan;
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作者单位

Cent South Univ, Sch Mat Sci & Engn, Key Lab Elect Packaging & Adv Funct Mat Hunan Pro, Changsha 410083, Hunan, Peoples R China;

Hunan Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China;

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正文语种英语
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aqueous zinc batteries; bentonite colloid electrolytes; Mn; (4+); (2+) redox reactions; Zn; Mn ionic exchange;

Manipulating Ion Concentration to Boost Two-Electron Mn~(4+)/Mn~(2+) Redox Kinetics through a Colloid Electrolyte for High-Capacity Zinc Batteries

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