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Three‐Dimensional Nanocomposite of Iron‐Based Fluoride Loaded in N‐Doped Porous Carbon as a High‐Performance Cathode for Rechargeable Li‐Ion Batteries
Author(s) -
Li Xiaopeng,
Zhang Yongzhi,
Meng Yan,
Tan Guangqun,
Ou Junke,
Wang Yujue,
Zhao Qian,
Yuan Hongyan,
Xiao Dan
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700259
Subject(s) - materials science , cathode , nanocomposite , electrochemistry , chemical engineering , carbon fibers , nanoparticle , doping , fluoride , nanotechnology , composite material , electrode , inorganic chemistry , optoelectronics , chemistry , composite number , engineering
Iron‐based fluorides are considered to be some of the most promising candidate cathode materials for high‐performance Li‐ion batteries, owing to their large capacities and high working potential. In this work, a three‐dimensional (3D) hybrid nanocomposite of Fe 2 F 5 ⋅ H 2 O (FF) loaded in N‐doped porous carbon (NPC) is successfully synthesized through a facile and scalable ionic‐liquid‐based precipitation followed by a mild heat treatment strategy. The 3D Fe 2 F 5 ⋅ H 2 O@NPC (FFNPC) nanocomposite with a hierarchical framework utilized as a cathode delivers a high reversible capacity of 185 mAh g −1 at 0.25 C (1 C=200 mA g −1 ) and 163 mAh g −1 at 0.5 C in the voltage range of 1.7–4.5 V (vs. Li/Li + ) at room temperature. Moreover, the 3D FFNPC cathode shows robust long‐term cycling stability, maintaining 118 mAh g −1 after 200 cycles even at 2 C. The rate performance shows a specific capacity of 115 mAh g −1 at the high current rate of 5 C. The improved electrochemical properties of the 3D FFNPC cathode can be attributed to the combination of the small‐sized iron fluoride nanoparticles and the NPC matrix, which not only provides a large surface area for the reaction, but also shortens the diffusion length for Li + and increases the electrical conductivity.