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Defective Lithium Storage Boosts High Rate and Long‐Life Span of Carbon Fibers
Author(s) -
Li Zhi,
Li Gangyong,
Ouyang Jie,
He Binhong,
Chen Liang,
Wang Wei,
Zhou Minjie,
Xu Wenyuan,
Zhang Yuxia,
Hou Zhaohui
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901140
Subject(s) - anode , materials science , lithium (medication) , energy storage , life span , carbon fibers , ion , nanotechnology , chemical engineering , capacitive sensing , composite material , chemistry , electrical engineering , electrode , composite number , organic chemistry , physics , engineering , medicine , gerontology , power (physics) , quantum mechanics , endocrinology
Carbonaceous‐based materials have been extensively investigated as anode of lithium ion batteries (LIBs) due to their low‐cost and good stability. However, the charge storage mechanism of graphitic carbon based on insertion/deinsertion of Li + ions is difficult to meet the needs for high‐performance LIBs because of the low specific capacity and limited rate property, and thus, it is quite necessary to develop novel carbon‐based anode materials beyond traditional energy storage mechanism. Herein, we demonstrate that appropriate thermal treatment endows N‐doped carbon fibers (N‐CFs) with attractive merits in LIB application, and show that N‐CFs with dominated capacitive contribution exhibit superior Li‐storage properties in the aspects of high reversible capacity (864.5 mAh g −1 at 0.1 A g −1 ), excellent rate capability (212.1 mAh g −1 at a super‐high current density of 20 A g −1 ), and long‐life span (no capacity decay over 2000 cycles at 5.0 A g −1 ) in half‐cells. The remarkable Li‐storage performance of N‐CFs can be attributed to the capacitive contribution‐dominated energy storage mechanism.