Lu Xianlu, Zhang Xinfeng, Zheng Yapeng, Zhang Dongdong, Jiang Lan, Gao Fengmei, Liu Qiao, Fu Dingfa, Teng Jie, Yang Weiyou
Institute of Micro/Nano Materials and Devices, Ningbo University of Technology, Ningbo 315211, P. R. China.
College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China.
Proc Natl Acad Sci U S A. 2022 Jun 7;119(23):e2122252119. doi: 10.1073/pnas.2122252119. Epub 2022 Jun 3.
SignificanceThe present work might be significant for exploring advanced K-ion batteries with superb rate capability and cycle stability toward practical applications. The as-assembled K-ion half cell exhibits an excellent rate capability of 428 mA h g at 100 mA g and a high reversible specific capacity of 330 mA h g with 120% specific capacity retention after 2,000 cycles at 2,000 mA g, which is the best among those based on carbon materials. The as-constructed full cell delivers 98% specific capacity retention over 750 cycles at 500 mA g, superior to most of those based on carbon materials that have been reported thus far.
意义
本工作对于探索具有卓越倍率性能和循环稳定性的先进钾离子电池以实现实际应用可能具有重要意义。所组装的钾离子半电池在100 mA g下展现出428 mA h g的优异倍率性能，在2000 mA g下进行2000次循环后具有330 mA h g的高可逆比容量以及120%的比容量保持率，这在基于碳材料的电池中是最佳的。所构建的全电池在500 mA g下750次循环后比容量保持率为98%，优于迄今为止报道的大多数基于碳材料的电池。
