首页|Constructing stronger interaction with polysulfides for faster conversion of Li2S2 to Li2S by Co-CoSe2@N,Se-doped carbon nanocages in lithium-sulfur batteries

Constructing stronger interaction with polysulfides for faster conversion of Li2S2 to Li2S by Co-CoSe2@N,Se-doped carbon nanocages in lithium-sulfur batteries

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The transformation of Li2S2-Li2S is indubitably the most crucial and labored rate-limiting step among the sophisticated reactions for the lithium-sulfur batteries(LSBs),the adjustment of which is anticipated to impede the shuttle effect.Herein,a N,Se dual-doped carbon nanocages embedded by Co-CoSe2 nanopar-ticles(Co-CoSe2@NSeC)is employed as a functional coating layer on commercial separator to improve the performance of LSBs.The well-designed N,Se co-doped nanostructures endow the modified layer with a satisfactory capacity for blocking polysulfides.Both calculations and experiments jointly disclose that the Li2S2 to Li2S reaction,including the liquid-solid conversion,was prominently expedited both thermodynamically and electrodynamically.Consequently,the batteries fabricated with Co-CoSe2@NSeC modified separator can deliver a favorable 764.2 mAh g-1 with 8.0 C,accompanied by a salient long cy-cling lifespan(only 0.066％at 1 C and 0.061％under 2 C after 1000 and 2000 cycles),and a desired anode protection.In addition,despite a raised areal loading of 7.53 mg cm-2 was introduced,the cells assembled by Co-CoSe2@NSeC@PP are allowed to produce an outstanding initial behavior of 8.71 mAh cm-2 under 0.2 C.This work may reinforce further explorations and serve with valuable insights into N,Se dual-doping materials for high-performance LSBs.

N,Se doping carbonLi2S2-Li2S phase-transitionHollow nanostructureModified separatorLithium-sulfur batteries

Ming Zheng、Wei Wu、Ruijian Luo、Suhao Chen、Junzhe Zhao、Niancai Cheng

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College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China

National Natural Science Foundation of ChinaProject on the Integration of Industry-Education-Research of Fujian Province

218750392021H6020

2024

10.1016/j.jmst.2024.02.014

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.195(28)