Defective Lithium Storage Boosts High Rate and Long‐Life Span of Carbon Fibers. Issue 19 (22nd May 2019)

• Record Type: Journal Article
• Authors: Li, Zhi; Li, Gangyong; Ouyang, Jie; He, Binhong; Chen, Liang; Wang, Wei; Zhou, Minjie; Xu, Wenyuan; Zhang, Yuxia; Hou, Zhaohui
• Is Part Of: ChemistrySelect. Volume 4:Issue 19(2019)
• Page Start: 5768
• Page End: 5775
• Publication Date: 2019-05-22
• Subjects: N-doping -- carbon fibers -- anode -- capacitive contribution -- lithium-ion battery; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201901140
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: 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. Abstract : Beyond typical diffusion‐controlled lithium storage mechanism of graphitic carbon: The capacitive contribution‐dominated energy storage mechanism resulting from the unique helical fibrous architecture, appropriate surface area, and a large number of defects, endows carbon fibers with excellent rate capability and superb cycling stability.