首页|Facilitating sulfur species capture and bi-directional redox in Li-S batteries with single-atomic Co-O2N2 coordination structure
Facilitating sulfur species capture and bi-directional redox in Li-S batteries with single-atomic Co-O2N2 coordination structure
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
万方数据
Lithium-sulfur(Li-S)batteries suffer from the shuttle effect of soluble lithium polysulfides(LiPSs)and slow redox kinetics,significantly limiting their practical application.Although single-atom catalysts(SACs)offer a promising strategy to address these challenges,designing materials with optimal adsorp-tion force and high catalytic activity remains a grand challenge.Here,we present a cobalt(Co)-based SAC with unique Co-O2N2 coordination structures for Li-S batteries.Both experimental and theoretical studies demonstrate that O,N-coordinated Co single atoms anchored on a porous carbon framework(Co/NOC)effectively capture LiPSs and dramatically catalyze bidirectional polysulfide conversion.The expanded carbon layer spacing facilitates lithium ions diffusion and maximizes the exposure of active sites.As a result,Li-S batteries incorporating Co/NOC as separators exhibit outstanding rate performance(906.6 mAh g-1 at 3 C)and exceptional cycling stability,even at-10 ℃.Furthermore,with a high sulfur loading of 12.0 mg cm-2,the areal specific capacity reaches up to 12.36 mAh cm-2.This work provides some use-ful insights for the design of high-performance SACs for Li-S batteries.
NETL
NSTL
万方数据
