纳米笼
材料科学
兴奋剂
碳纤维
电池(电)
纳米技术
硫族元素
碳纳米管
化学工程
复合材料
光电子学
复合数
功率(物理)
结晶学
热力学
有机化学
工程类
物理
催化作用
化学
作者
Xuefeng Zhou,Lifeng Wang,Yu Yao,Yu Jiang,Rui Xu,Haiyun Wang,Xiaojun Wu,Yan Yu
标识
DOI:10.1002/adfm.202003871
摘要
Abstract Potassium–selenium (K‐Se) batteries have attracted increasing attention for their potential as stationary energy storage systems due to their high theoretical energy density and low cost. The major challenges of these batteries are the low utilization of active selenium, sluggish kinetics, and the volume change during cycling. Herein, a N and O dual‐doped porous carbon nanocage anchored with carbon nanotubes (CNTs) (denoted as NO‐nanocage/CNT) is designed as a host for Se. This material combines multiple advantages, such as abundant N/O active sites and excellent electrical conductivity, to realize highly efficient immobilization of Se and polyselenide and fast redox kinetics. The hollow carbon skeleton, with abundant micro and mesoporous structures, shortens the diffusion distances between the ions/electrons and accommodates the volume expansion of the active materials. Density functional theory calculations further confirm that the NO‐nanocage/CNT exhibits strong chemical affinity to K 2 Se, which is in agreement with the experimental results. The Se@NO‐nanocage/CNT cathode displays a remarkable reversible capacity (623 mAh g −1 at 0.1 A g −1 ) and an ultra‐long cycle life (274 mAh g −1 after 3500 cycles at 1.0 A g −1 ). The design presented in this paper offers a new approach for the design of multifunctional Se hosts for advanced alkali metal‐chalcogen batteries.
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