Premium
Nitrogen‐Doped Carbon‐Coated Bimetal Selenides for High‐Performance Lithium‐Ion Storage through the Self‐Accommodation of Volume Change
Author(s) -
Sun Weiwei,
Zhang Yanfeng,
Wang Yong
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900848
Subject(s) - bimetal , materials science , anode , carbon fibers , nitrogen , lithium (medication) , chemical engineering , electrochemistry , inert gas , metal , battery (electricity) , inorganic chemistry , composite number , composite material , electrode , metallurgy , chemistry , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Owing to the problem of volume expansion during cycling, metal selenides with a high capacity and long‐term cyclability are still very exploratory. In this work, we fabricate a Co/Zn‐based multi‐metallic metal organic framework at room temperature, and then select one‐step selenization under an inert atmosphere to obtain the nitrogen‐doped carbon‐coated bimetal selenide composites. Originating from the nanoparticles‐assembled porous structure, the in situ formed nitrogen‐doped carbon coating, and the self‐accommodation effect based on two components at stepwise Li reaction potentials, the nitrogen‐doped carbon‐coated bimetal selenide (Co/Zn‐Se@NC) anodes deliver improved electrochemical properties. In particular, with the molar ratio (Co/Zn) changing, the Co/Zn‐Se@NC‐1 at Co/Zn=9 : 1 achieves high initial capacities (discharge/charge: 1040/788 mAh g −1 ) with 836 mAh g −1 retained after 300 cycles. More efforts should be put into the exploration of mixed metal selenides and their composites with self‐accommodation effects for applications in energy storage.