Highly Stable Iron‐ and Carbon‐Based Electrodes for Li‐Ion Batteries: Negative Fading and Fast Charging within 12 Min. Issue 19 (26th August 2022)

• Record Type: Journal Article
• Authors: Choi, Wonyoung; Ha, Jaeyun; Kim, Yong‐Tae; Choi, Jinsub
• Is Part Of: ChemSusChem. Volume 15:Issue 19(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-26
• Subjects: batteries -- graphene -- iron -- lithium -- self-assembly; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202201137
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Lithium‐ion batteries (LIBs) with high energy density and safety under fast‐charging conditions are highly desirable for electric vehicles. However, owing to the growth of Li dendrites, increased temperature at high charging rates, and low specific capacity in commercially available anodes, they cannot meet the market demand. In this study, a facile one‐pot electrochemical self‐assembly approach has been developed for constructing hybrid electrodes composed of ultrafine Fe3 O4 particles on reduced graphene oxide (Fe3 O4 @rGO) as anodes for LIBs. The rationally designed Fe3 O4 @rGO electrode containing 36 wt % rGO exhibits an increase in specific capacity as cycling progresses, owing to improvements in the active sites, electrochemical kinetics, and catalytic behavior, leading to a high specific capacity of 833 mAh g −1 and outstanding cycling stability over 2000 cycles with a capacity loss of only 0.127 % per cycle at 5 A g −1, enabling the full charging of batteries within 12 min. Furthermore, the origin of this abnormal improvement in the specific capacity (called negative fading), which exceeds the theoretical capacity, is investigated. This study opens up new possibilities for the commercial feasibility of Fe3 O4 @rGO anodes in fast‐charging LIBs. Abstract : Fade to great : A self‐assembled magnetite network on reduced graphene oxide sheets prepared by a one‐step electrochemical approach exhibits stable cycling performances over 2000 cycles with high capacity even under a high C‐rate of 5 A g −1 . This enables charging within 12 min, owing to negative fading, which increases the capacity beyond the theoretical limit.