Reaction Liquid Circulation in Liquid Phase Synthesis of LiFePO<sub>4</sub> as Cathode Material

化学工业与工程

Chemcial Industry and Engineering

2017, Vol. 34

Issue (1) :60-64,83 DOI: 10.13353/j.issn.1004.9533.20151045

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Reaction Liquid Circulation in Liquid Phase Synthesis of LiFePO₄ as Cathode Material

Ma Junjun, Zu Xuemin, Wang Xinyao

School of Sciences, Tianjin University, Tianjin 300072, China

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Abstract

LiFePO₄ cathode materials for lithium-ion batteries were synthesized by the liquid-state method using FeSO₄·7H₂O, NH₄H₂PO₄, H₂O₂, CH₃COOLi and so on. The aqueous can be directly used in the synthesis of FePO₄·xH₂O without any treatment and the ethanol should be distilled before the synthesis of LiFePO₄. The structure, morphology and electrochemical performance of the materials were analyzed by XRD, SEM and galvanostatic charge-discharge tests. The results showed that the high purity of FePO₄·xH₂O can be achieved and even prepared with the aqueous which was used for five times. LiFePO₄ cathode material prepared with the distilled ethanol exhibited the best initial discharge capacity of 156.3 mAh·g^-1 and the capacity retention ratio 99.49% after 30 cycles at 0.1 C rate.

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	Ma Junjun
	Zu Xuemin
	Wang Xinyao

Keywords： LiFePO₄； liquid-state method； lithium-ion batteries

Received 2015-04-02;

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Ma Junjun, Zu Xuemin, Wang Xinyao.Reaction Liquid Circulation in Liquid Phase Synthesis of LiFePO₄ as Cathode Material[J] Chemcial Industry and Engineering, 2017,V34(1): 60-64,83

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