阳极
材料科学
动力学
化学工程
扩散
离子
纳米技术
电极
化学
物理化学
热力学
量子力学
物理
工程类
有机化学
作者
Jianwen Zhou,Yelong Zhang,Zheng Liu,Zhenping Qiu,Da Wang,Qingguang Zeng,Changchun Yang,Kwun Nam Hui,Yong Yang,Zhangquan Peng,Shaojun Guo
标识
DOI:10.1007/s40843-022-2073-y
摘要
The sluggish reaction kinetics and poor structure stability of transition metal dichalcogenides (TMDs)-based anodes in potassium-ion batteries (KIBs) usually cause limited rate performance and rapid capacity decay, which seriously impede their application. Herein, we report a vacancy engineering strategy for preparing a class of Te-doped 1T’-ReSe2 anchored onto MXene (Te-ReSe2/MXene) as an advanced anode for KIBs with high performance. By taking advantage of the synergistic effects of the defective Te-ReSe2 arrays with expanded interlayers and the elastic MXene nanosheets with self-autoadjustable function, the Te-ReSe2/MXene superstructure exhibits boosted K+ ion storage performance, in terms of high reversible capacity (361.1 mA h g−1 at 0.1 A g−1 over 200 cycles), excellent rate capability (179.3 mA h g−1 at 20 A g−1), ultra-long cycle life (202.8 mA h g−1 at 5 A g−1 over 2000 cycles), and steady operation in flexible full battery, presenting one of the best performances among the TMDs-based anodes reported thus far. The kinetics analysis and theoretical calculations further indicate that satisfactory pseudocapacitive property, high electronic conductivity and outstanding K+ ion adsorption/diffusion capability corroborate the accelerated reaction kinetics. Especially, structural characterizations clearly elaborate that the Te-ReSe2/MXene undergoes reversible evolutions of an initial insertion process followed by a conversion reaction.
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