High-performance K-ion half/full batteries with superb rate capability and cycle stability
Xianlu Lu, Xinfeng Zhang, Yapeng Zheng, Dongdong Zhang, Lan Jiang, Fengmei Gao, Qiao Liu, Dingfa Fu, Jie Teng, Weiyou Yang
Abstract
Significance The 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 −1 at 100 mA g −1 and a high reversible specific capacity of 330 mA h g −1 with 120% specific capacity retention after 2,000 cycles at 2,000 mA g −1 , 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 −1 , superior to most of those based on carbon materials that have been reported thus far.