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Soluble Organic Cathodes Enable Long Cycle Life, High Rate and Wide-temperature Lithium-ion Batteries.

Mengjie LiJixing YangYeqing ShiZifeng ChenPanxing BaiHai SuPeixun XiongMingren ChengJiwei ZhaoYunhua Xu
Published in: Advanced materials (Deerfield Beach, Fla.) (2021)
Organic electrode materials free of rare transition metal elements are promising for sustainable, cost-effective and environmentally benign battery chemistries. However, severe shuttling effect caused by the dissolution of active materials in liquid electrolytes results in fast capacity decay, limiting their practical applications. Here, using a gel polymer electrolyte (GPE) that is in situ formed on Nafion-coated separators, we eliminate the shuttle reaction of organic electrodes while maintaining the electrochemical performance. The synergy of physical confinement by GPE with tunable polymer structure and charge repulsion of the Nafion-coated separator substantially prevented the soluble organic electrode materials with different molecular sizes from shuttling. A soluble small-molecule organic electrode material of 1,3,5-tri(9,10-anthraquinonyl)benzene demonstrates exceptional electrochemical performance with an ultra-long cycle life of 10,000 cycles, excellent rate capability of 203 mAh g-1 at 100C and a wide working temperature range from -70 to 100 °C based on the solid-liquid conversion chemistry, which outperforms all previously reported organic cathode materials. The shielding capability of GPE can be designed and tailored towards organic electrodes with different molecular sizes, thus providing a universal resolution to the shuttling effect that all soluble electrode materials suffer. This article is protected by copyright. All rights reserved.
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