过渡金属离子掺杂对磷酸铁锂性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.02.006

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Abstract By adding different transition metal acetates(manganese acetate, cobaltous acetate, nickel acetate, zinc acetate), LiFePO₄/C composite materials were synthesized for lithium rechargeable batteries by high temperature solid-state reaction under the protection of argon, using Li₂CO₃, FeC₂O₄·2H₂O, NH₄H₂PO₄ , C₆H₁₂O₆ (glucose) as raw materials. Effect of doping transition metal ions on crystal structure and performance of the sample was investigated by using X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, galvanostatic charge discharge and electrochemical impedance spectroscopy, cyclic voltammetry. The results indicated that LiFe_0.9M_0.1PO₄/C(M=Mn, Co, Ni, Zn) and LiFePO₄ have the same crystal structure of olivine-style. Doping transition metal ions can increase the reduction potential of LiFePO₄/C, decrease the oxidation potential, reduce the distance between redox peaks, and improve the reversibility of the chemical reaction. The doped samples have a better discharge performance at 5C, especially LiFe_0.9Ni_0.1PO₄/C which has the highest discharge specific capacity reaching 89 mAh/g.

Key words： LiFePO₄/C composite material transition metal doping

Published: 02 May 2018

CLC number:

TM912.9

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	Articles by authors
	YE Changfu
	ZHENG Huiyuan
	LAO Ming
	ZHOU Wenzheng
	GUO Jin
	LI Guangxu

Cite this article:

YE Changfu,ZHENG Huiyuan,LAO Ming, et al. Effect of Transition Metal Ions Doping on the Performance of LiFePO₄/C Cathode Material[J]. Materials Reports, 2017, 31(2): 29-32.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.02.006 OR http://www.mater-rep.com/EN/Y2017/V31/I2/29

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