期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 2, 页码 1627-1633出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02119
关键词
amorphous; defects; woodruffite; zinc manganese oxide; battery; aqueous; polymorphs
资金
- US Department of Energy, Office of Basic Energy Sciences, Division of Chemical, Biological and Geological Sciences [DE-FG02-86ER13622]
Crystalline manganese oxides have attracted the most attention in aqueous zinc-ion batteries due to their diverse nanostructures and low cost. However, extensive studies on amorphous manganese oxides are lacking. Herein, we report a mesoporous amorphous manganese oxide (UCT-1-250) as a cathode material with high capacity (222 mAh g(-1)), good cyclability (57% capacity retention after 200 cycles), and an acceptable discharge plateau (between 1.2 and 1.4 V). An approach to mechanistic studies was performed by comparison of UCT-1-250 and other crystalline manganese oxides through electrochemical, elemental, and structural analyses. An in situ conversion to ZnMn2O4 spinel phase after initial cycling contributes to the high performance. The irreversible capacity fading is due to the formation of the woodruffite phase.
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