High cycling stability of MnO2 cathode for aqueous Mg-ion batteries enabled by Fe doping

被引：2

作者：

Wang, Qian ^{[1
,2
]}

Liu, Zhenzhen ^{[2
,3
]}

Xu, Ting ^{[1
]}

Li, Hongjiao ^{[4
]}

Chen, Yungui ^{[1
,5
]}

Yan, Yigang ^{[1
,5
]}

机构：

[1] Sichuan Univ, Inst New Energy & Low Carbon Technol, Chengdu 610207, Peoples R China

[2] Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610065, Peoples R China

[3] Nanyang Prod Qual Inspection & Testing Ctr, Beijing, Peoples R China

[4] Sichuan Univ, Sch Chem Engn, Chengdu 610065, Peoples R China

[5] Minist Educ, Engn Res Ctr Alternat Energy Mat & Devices, Chengdu, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2024年 / 611卷

基金：

中国国家自然科学基金;

关键词：

Aqueous Mg-Ion battery; Cathode material; MnO2; Cycle stability; MANGANESE-DIOXIDE; HIGH-PERFORMANCE; MAGNESIUM; LITHIUM;

D O I：

10.1016/j.jpowsour.2024.234763

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

MnO2 has been widely investigated as a promising cathode material for aqueous magnesium-ion batteries, which, however, suffers from the severe capacity fading during charge/discharge cycling. In present work, we report that the doping of Fe in alpha-MnO2 enlarges the lattice and alleviates the Jahn-Teller distortions and thus accelerates the Mg2+ diffusion and strengthens the structural stability. Consequently, the capacity retention remarkably increases from 44.3 % to 85.2 % after 1000 cycles by Fe doping. Furthermore, it is found for the first time that Fe doping enables the co-insertion of H+ and Mg2+ in the tunnels of alpha-MnO2, which improves remarkably the specific capacity from 131.9 to 205.9 mA h g(-1) at 0.1 A g(-1).

引用

页数：9

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