Xue Zhiyang, Chen Yun, Xu Kangjie, Miao Yingchun, Zhao Xiangyu
State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China.
Advanced Analysis and Testing Center, Nanjing Forestry University, Nanjing, 210037, China.
Small. 2024 Jul;20(28):e2311700. doi: 10.1002/smll.202311700. Epub 2024 Jan 29.
A variety of inorganic and inorganic cathode materials for chloride ion storage are reported. However, their application in chloride ion batteries (CIB) is hindered by poor rate capability and cycling stability. Herein, an organic poly(butyl viologen dichloride) (PBVCl) cathode material with significantly enhanced rate and cycling performance in the CIB is achieved using a crown ether (18-Crown-6) additive in the tributylmethylammonium chloride-based electrolyte. The as-prepared PBVCl cathodes exhibit impressive capacity increases from 149.4 to 179.1 mAh g at 0.1 C and from 57.8 to 111.9 mAh g at 10 C, demonstrating the best rate performance with the highest energy density among those of various reported cathodes for CIBs. This impressive performance improvement is a result of the great boosts in charge transfer, ion transport, and interface stability of the battery by the use of 18-Crown-6, which also contributes to a more than twofold increase in capacity retention after 120 cycles. The electrode reaction mechanism of the CIB based on highly reversible chloride ion transfer is revealed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy.
报道了多种用于氯离子存储的无机和无机正极材料。然而，它们在氯离子电池（CIB）中的应用受到倍率性能差和循环稳定性的阻碍。在此，通过在基于氯化三丁基甲基铵的电解质中使用冠醚（18-冠-6）添加剂，实现了一种在CIB中具有显著增强的倍率和循环性能的有机聚（丁基紫精二氯化物）（PBVCl）正极材料。所制备的PBVCl正极在0.1 C时的容量从149.4 mAh g显著增加到179.1 mAh g，在10 C时从57.8 mAh g增加到111.9 mAh g，在各种报道的CIB正极中展示出最佳的倍率性能和最高的能量密度。这种令人印象深刻的性能提升是由于使用18-冠-6极大地促进了电池的电荷转移、离子传输和界面稳定性，这也使得在120次循环后容量保持率提高了两倍多。通过傅里叶变换红外光谱和X射线光电子能谱揭示了基于高度可逆氯离子转移的CIB的电极反应机理。
