Zhang Weisheng, Tian Hao, Wang Jiawen, Sun Huimin, Wang Jing, Huang Weiwei
School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China.
ACS Appl Mater Interfaces. 2022 Aug 31;14(34):38887-38894. doi: 10.1021/acsami.2c10852. Epub 2022 Aug 17.
As a class of flexible and designable materials, organic electrode materials would greatly facilitate the progress of potassium-ion batteries (PIBs), especially when the dissolution issue is ameliorated. Ionic liquid electrolytes (ILEs) do not merely alleviate the dissolution of organic materials but provide reliable security. Herein, Pillar[5]quinone (P5Q) as the cathode of PIBs is demonstrated for the first time, and the electrochemical performance of two common ILEs is investigated. In the 0.3 M KFSI-PY13FSI electrolyte with better conductivity, the P5Q cathode maintains a large reversible capacity of 232 mAh g (450 Wh kg) after 100 cycles at 0.2C at 1.2-4.0 V. When a current density of 2.0C is applied, the cell retains a capacity of 101 mAh g (211 Wh kg) after 1000 cycles and 61 mAh g (125 Wh kg) even over 5000 cycles. This research would inspire research on organic electrodes and advance the application of PIBs.
作为一类具有柔韧性和可设计性的材料，有机电极材料将极大地推动钾离子电池（PIBs）的发展，尤其是在溶解问题得到改善的情况下。离子液体电解质（ILEs）不仅能减轻有机材料的溶解，还能提供可靠的安全性。在此，首次展示了柱[5]醌（P5Q）作为PIBs的阴极，并研究了两种常见ILEs的电化学性能。在具有更好导电性的0.3 M KFSI-PY13FSI电解质中，P5Q阴极在1.2 - 4.0 V下以0.2C循环100次后，保持232 mAh g（450 Wh kg）的大可逆容量。当施加2.0C的电流密度时，电池在1000次循环后保持101 mAh g（211 Wh kg）的容量，甚至在5000次循环后仍保持61 mAh g（125 Wh kg）的容量。这项研究将激发对有机电极的研究，并推动PIBs的应用。
