Polyanthraquinone as a Reliable Organic Electrode for Stable and Fast Lithium Storage |
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| Authors: | Dr Zhiping Song Dr Yumin Qian Dr Mikhail L Gordin Dr Duihai Tang Dr Terrence Xu Prof Minoru Otani Prof Hui Zhan Prof Haoshen Zhou Prof Donghai Wang |
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| Affiliation: | 1. Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802 (USA);2. Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305‐8568 (Japan);3. Department of Chemistry, Wuhan University, Wuhan 430072 (China);4. Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305‐8568 (Japan);5. Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615‐8520 (Japan);6. National Laboratory of Solid State Microstructures, Department of Energy Science and Engineering, Nanjing University, Nanjing 210093 (China) |
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| Abstract: | In spite of recent progress, there is still a lack of reliable organic electrodes for Li storage with high comprehensive performance, especially in terms of long‐term cycling stability. Herein, we report an ideal polymer electrode based on anthraquinone, namely, polyanthraquinone (PAQ), or specifically, poly(1,4‐anthraquinone) (P14AQ) and poly(1,5‐anthraquinone) (P15AQ). As a lithium‐storage cathode, P14AQ showed exceptional performance, including reversible capacity almost equal to the theoretical value (260 mA h g?1; >257 mA h g?1 for AQ), a very small voltage gap between the charge and discharge curves (2.18–2.14=0.04 V), stable cycling performance (99.4 % capacity retention after 1000 cycles), and fast‐discharge/charge ability (release of 69 % of the low‐rate capacity or 64 % of the energy in just 2 min). Exploration of the structure–performance relationship between P14AQ and related materials also provided us with deeper understanding for the design of organic electrodes. |
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| Keywords: | anthraquinone cathodes lithium batteries organic electrode materials polymers |
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