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Scalable Preparation of LiFePO 4 /C Nanocomposites with sp 2 ‐Coordinated Carbon Coating as High‐Performance Cathode Materials for Lithium‐Ion Batteries
Author(s) -
Kretschmer Katja,
Sun Bing,
Su Dawei,
Zhao Yufei,
Wang Guoxiu
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500262
Subject(s) - materials science , electrochemistry , nanocomposite , carbon fibers , cathode , coating , ball mill , starch , raman spectroscopy , chemical engineering , composite number , lithium (medication) , composite material , chemistry , electrode , organic chemistry , medicine , physics , endocrinology , optics , engineering
We hereby report carbon‐coated LiFePO 4 cathode materials prepared by industrial ball milling and a solid‐state reaction with Li 2 CO 3 , NH 4 H 2 PO 4 , and FeC 2 O 4 ⋅2 H 2 O as starting materials. Soluble starch as the primary carbon source was investigated for its capability of generating a highly graphitic carbon coating, whilst sufficiently controlling the crystal growth of LiFePO 4 . XRD analysis, Raman spectroscopy, and electrochemical testing revealed the significant impact of the amount of starch added to the pre‐sintered precursor on phase purity, carbon quality, and electrochemical performance of the final LiFePO 4 /C composite. The optimum soluble starch content to achieve a highly sp 2 ‐coordinated carbon coating is 10 wt %, which enabled our LiFePO 4 /C composite to achieve competitive reversible capacities as well as improved rate performance.