期刊
SMALL
卷 15, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201902220
关键词
catalysts; cyclability; lithium-air battery; low overpotential
类别
资金
- National Natural Science Foundation of China [51771162] Funding Source: Medline
- National Key Research and Development Program [2017YFB0702001] Funding Source: Medline
- National Natural Science Foundation-Outstanding Youth Foundation [51771162] Funding Source: Medline
- High-Performance Computing Platform of Hebei University and Graduate Student Innovative Funding Program of Hebei Province [CXZZBS2019053] Funding Source: Medline
Li-CO2 batteries can not only capture CO2 to solve the greenhouse effect but also serve as next-generation energy storage devices on the merits of economical, environmentally-friendly, and sustainable aspects. However, these batteries are suffering from two main drawbacks: high overpotential and poor cyclability, severely postponing the acceleration of their applications. Herein, a new Co-doped alpha-MnO2 nanowire catalyst is prepared for rechargeable Li-CO2 batteries, which exhibits a high capacity (8160 mA h g(-1) at a current density of 100 mA g(-1)), a low overpotential (approximate to 0.73 V), and an ultrahigh cyclability (over 500 cycles at a current density of 100 mA g(-1)), exceeding those of Li-CO2 batteries reported so far. The reaction mechanisms are interpreted depending on in situ experimental observations in combination with density functional theory calculations. The outstanding electrochemical properties are mostly associated with a high conductivity, a large fraction of hierarchical channels, and a unique Co interstitial doping, which might be of benefit for the diffusion of CO2, the reversibility of Li2CO3 products, and the prohibition of side reactions between electrolyte and electrode. These results shed light on both CO2 fixation and new Li-CO2 batteries for energy storage.
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