片层纳米结构磷酸铁制备及对磷酸铁锂电性能的影响

doi:10.11896/j.issn.1005-023X.2018.19.006

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Abstract Using liquid phase reactive crystallization, NaAlO₂ was added to phosphorus source and iron source and the lamellar nanostructure of spindle shaped iron phosphate precursor was synthesized by the effect of Al(OH)₃ colloid on the crystal surface during crystallization. It was used to prepare LiFePO₄ through high temperature solid state method. The samples were characterized by means of XRD, FT-IR, SEM, TEM, analysis of BET surface area and porosity, laser particle size analyzer and electrochemical performance test. The results showed that the initial discharge capacity of the LiFePO₄ that prepared by the lameller nanostructure FePO₄ precursor at 0.1C increased by 20%, reaching 151.48 mAh/g, and the electrode charge transfer resistance was reduced by 75%, just 27.23 Ω, compared with the LiFePO₄ that prepared by non lameller nanostructure FePO₄, and the retention rate of capacity reached 96% after 50 cycles at 0.1C rate. Meanwhile, the mechanism of Al(OH)₃ colloid affecting the formation of lamellar nanostructured iron phosphate was analyzed and discussed.

Key words： lameller nanostructure iron phosphate lithium iron phosphate electrochemical properties

Published: 18 October 2018

CLC number:

TM911

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	Articles by authors
	MA Zhiming
	XIAO Rengui
	LIAO Xia
	KE Xiang

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MA Zhiming,XIAO Rengui,LIAO Xia, et al. Preparation of the Lameller Nanostructure Iron Phosphate and Its Effect on the Electrochemical Performance of Lithium Iron Phosphate[J]. Materials Reports, 2018, 32(19): 3325-3331.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.19.006 OR http://www.mater-rep.com/EN/Y2018/V32/I19/3325

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