Open AccessEncapsulation of CoS x Nanocrystals into N/S Co‐Doped Honeycomb‐Like 3D Porous Carbon for High‐Performance Lithium Storage
Author(s) -
Yin Bo,
Cao Xinxin,
Pan Anqiang,
Luo Zhigao,
Dinesh Selvakumaran,
Lin Jiande,
Tang Yan,
Liang Shuquan,
Cao Guozhong
Publication year - 2018
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201800829
Subject(s) - cobalt sulfide , materials science , anode , chemical engineering , polyacrylonitrile , electrochemistry , composite number , electrolyte , nanocomposite , lithium (medication) , porosity , electrode , carbon fibers , lithium ion battery , energy storage , nanotechnology , battery (electricity) , composite material , chemistry , medicine , endocrinology , engineering , power (physics) , physics , quantum mechanics , polymer
A honeycomb‐like 3D N/S co‐doped porous carbon‐coated cobalt sulfide (CoS, Co 9 S 8 , and Co 1– x S) composite (CS@PC) is successfully prepared using polyacrylonitrile (PAN) as the nitrogen‐containing carbon source through a facile solvothermal method and subsequent in situ conversion. As an anode for lithium‐ion batteries (LIBs), the CS@PC composite exhibits excellent electrochemical performance, including high reversible capacity, good rate capability, and cyclic stability. The composite electrode delivers specific capacities of 781.2 and 466.0 mAh g −1 at 0.1 and 5 A g −1 , respectively. When cycled at a current density of 1 A g −1 , it displays a high reversible capacity of 717.0 mAh g −1 after 500 cycles. The ability to provide this level of performance is attributed to the unique 3D multi‐level porous architecture with large electrode–electrolyte contact area, bicontinuous electron/ion transport pathways, and attractive structure stability. Such micro‐/nanoscale design and engineering strategies may also be used to explore other nanocomposites to boost their energy storage performance.