One-pot pyro-synthesis of a high energy density LiFePO₄-Li₃V₂(PO₄)₃ nanocomposite cathode for lithium-ion battery applications

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• 作者：Jeonggeun Jo¹ ; Jihyeon Gim¹ ; Jinju Song ; Yeoun Kim ; Vinod Mathew ; Sungjin Kim ; Seokhun Kim ; Sohyun Park ; Joseph Paul Baboo ; Jaekook Kim ; ^{jaekook@chonnam.ac.kr}
• 关键词：Nanocomposite ; Nanoparticles ; Pyro synthesis ; Electrochemical properties ; Lithium ion batteries
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：43
• 期：5
• 页码：4288-4294
• 全文大小：2202 K
• 卷排序：43

文摘

A highly crystalline carbon-coated 0.66LiFePO4 0.33Li3V2(PO4)3 (LFP-LVP) nanocomposite was synthesized by a one-pot pyro-synthetic strategy using a polyol medium at low temperature. Prior to any additional heat treatment, electron microscopy confirmed the as-synthesized composite to consist of spherical particles with average diameters in the range of 30–60 nm. A crystal growth phenomenon and particle aggregation was observed upon heat treatment at 800 °C, thus resulting in an increase in the average particle size to 200–300 nm. When tested for a lithium-ion cell, the nanocomposite electrode demonstrated impressive electrochemical properties with higher operating potentials hence enhanced energy densities. Specifically, the composite cathode delivered a high reversible capacity of 156 mAh g−1 at 0.1 C and exhibited a remarkable reversible capacity of 119 mAh g−1, corresponding to an energy density of 46.88 Wh Kg−1 at 6.4 C. When cycling was performed at 6.4 C, the electrode could recover up to 85% of the capacity observed at low current density of 0.1 C, which indicates the excellent rate capability of the nanocomposite electrode. The enhanced performance was attributed to the inclusion of the high potential LVP phase constituent in the present cathode by a simple one-pot polyol-assisted pyro strategy.