期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 41, 页码 13883-13892出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c05070
关键词
Li-O-2 battery; Redox mediator; Shuttle effect; Bacterial cellulose; Electrostatic repulsion
资金
- National Natural Science Foundation of China (NSFC) [51872316]
- fundamental research project from the Science and Technology Commission of Shanghai Municipality [18DZ2280800]
The study successfully suppressed the shuttle effect of redox mediators in Li-O-2 batteries by using a sulfonation strategy with bacterial cellulose as a biomaterial, improving the cycling performance and protecting the lithium anode.
The practical applications of Li-O-2 batteries are hindered by the large charge polarization. Recently, the development of redox mediators (RMs) brings new hope for constructing low overpotential Li-O-2 batteries. However, the shuttle effect of RMs causes new problems. Here, based on a low-cost and environmentally friendly biomaterial-bacterial cellulose, a sulfonation strategy was adopted to produce a functional gel polymer electrolyte for LiI-involved Li-O-2 batteries. Benefiting from the high-density negatively charged sulfonate groups on the sulfonated bacterial cellulose, the functionalized gel electrolyte can produce strong electrostatic repulsion force to the negatively charged I-3(-) ions to suppress the shuttle effect. As a result, the Li-O-2 battery shows a good cycling performance with eliminated self-discharge, and the Li anode is successfully protected by the inhibition of I-3(-) shuttling. This novel approach may provide new insights into the development of functionalized gel polymer electrolytes for Li-O-2 batteries with redox mediators.
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