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Integrating Multiredox Centers into One Framework for High-Performance Organic Li-Ion Battery Cathodes

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journal contribution
posted on 20.12.2019, 19:40 by Chunyu Cui, Xiao Ji, Peng-Fei Wang, Gui-Liang Xu, Long Chen, Ji Chen, Hacksung Kim, Yang Ren, Fu Chen, Chongyin Yang, Xiulin Fan, Chao Luo, Khalil Amine, Chunsheng Wang
Organic cathode materials are promising for developing high-energy and high-power Li-ion batteries (LIBs). However, the energy storage of most organic cathodes relies on the electron transfer of a single type of functional group, leading to either a low redox potential or a low capacity. Here we propose a new strategy for the structure design and performance optimization of organic materials. A new organic cathode, dithianon (DTN), containing three functional groups (−S–, CO, CN) in one framework, is reported. The −S– group increases the redox potential to 3.0 V, while CO and CN groups enable a three Li-ions-involved redox reaction. As a cathode, DTN delivers 270.2 mAh g–1 at 0.5C for 300 cycles. Even at 5C, it still retains 161.5 mAh g–1 after 1000 cycles. The high-capacity, high-power, and stable DTN cathode offers great promise for high-performance and sustainable LIBs.