Scalable Preparation of LiFePO<inf>4</inf>/C Nanocomposites with sp<sup>2</sup>-Coordinated Carbon Coating as High-Performance Cathode Materials for Lithium-Ion Batteries

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Journal Article
ChemElectroChem, 2015, 2 (12), pp. 2096 - 2103
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© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 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 ⋅2H 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 10wt%, which enabled our LiFePO 4 /C composite to achieve competitive reversible capacities as well as improved rate performance.
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