Influence Mechanism of Mg2+ Doping on Electrochemical Properties of LiFePO4 Cathode Materials

doi:10.1021/acsaem.2c00986

	Influence Mechanism of Mg2+ Doping on Electrochemical Properties of LiFePO4 Cathode Materials
	Liu, Xingzhong 3; Zhang, Yue 2; Meng, Yanshuang 1; Kang, Tai 3; Gao, Hongfu 3; Huang, Liangbiao 3; Zhu, Fuliang 1,3
刊名	ACS APPLIED ENERGY MATERIALS
	2022-06-01
关键词	LiFePO4 Mg2+ doping electron conductivity lithium-ion battery electrochemical properties
ISSN号	2574-0962
DOI	10.1021/acsaem.2c00986
英文摘要	For this work, a Mg2+-doped LiFePO4 (LFP) cathode material was prepared using a solid-state method with refinement data suggested that an appropriate doping amount of Mg2+ can reduce the cell volume of LFP, shorten the Fe-O and P-O bonds, and elongate the Li-O bond, thereby facilitating the diffusion of Li+. X-ray photoelectron spectroscopy test results revealed that Mg2+ doping prevents the formation of Li-Fe antisite defects while also promoting the formation of Fe2P, thereby improving the electronic conductivity of the LFP. The electronic conductivity was measured using a four-probe teste, and the Li+ diffusion rate was fitted and calculated according to the electrochemical impedance spectroscopy test results. The results found that electron conductivity expanded by 275 times and the Li+ diffusion coefficient increased by 3.6 times following LFP being doped with Mg2+. Charge/discharge curves and cyclic voltammetry test reveal that LFP with Mg2+ doping has superior reversibility, rate performance, and cycle stability, and the capacity can be maintained at 162 mA h g-1 following 300 cycles at 0.1 C.
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000820796800001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158937]
专题	材料科学与工程学院
作者单位	1.State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China 2.Georgia Southern Univ, Dept Mfg Engn, Statesboro, GA 30458 USA; 3.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China;
推荐引用方式 GB/T 7714	Liu, Xingzhong,Zhang, Yue,Meng, Yanshuang,et al. Influence Mechanism of Mg2+ Doping on Electrochemical Properties of LiFePO4 Cathode Materials[J]. ACS APPLIED ENERGY MATERIALS,2022.
APA	Liu, Xingzhong.,Zhang, Yue.,Meng, Yanshuang.,Kang, Tai.,Gao, Hongfu.,...&Zhu, Fuliang.(2022).Influence Mechanism of Mg2+ Doping on Electrochemical Properties of LiFePO4 Cathode Materials.ACS APPLIED ENERGY MATERIALS.
MLA	Liu, Xingzhong,et al."Influence Mechanism of Mg2+ Doping on Electrochemical Properties of LiFePO4 Cathode Materials".ACS APPLIED ENERGY MATERIALS (2022).