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 1; Zhang, Yue 2; Meng, Yanshuang 3; Kang, Tai 1; Gao, Hongfu 1; Huang, Liangbiao 1; Zhu, Fuliang1,3
	2022-06-16
发表期刊	ACS APPLIED ENERGY MATERIALS
ISSN	2574-0962
卷号	5 期号:7 页码:8452-8459
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.
关键词	LiFePO4 Mg2+ doping electron conductivity lithium-ion battery electrochemical properties
DOI	10.1021/acsaem.2c00986
收录类别	SCIE ; EI
语种	英语
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
WOS类目	Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS记录号	WOS:000820796800001
出版者	AMER CHEMICAL SOC
EI入藏号	20223012392768
EI主题词	Lithium compounds
EI分类号	701.1 Electricity: Basic Concepts and Phenomena - 801 Chemistry - 801.4.1 Electrochemistry
来源库	WOS
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/158937
专题	材料科学与工程学院
通讯作者	Zhang, Yue; Zhu, Fuliang
作者单位	1.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China; 2.Georgia Southern Univ, Dept Mfg Engn, Statesboro, GA 30458 USA; 3.State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
第一作者单位	材料科学与工程学院
通讯作者单位	材料科学与工程学院
第一作者的第一单位	材料科学与工程学院
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,2022,5(7):8452-8459.
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,5(7),8452-8459.
MLA	Liu, Xingzhong,et al."Influence Mechanism of Mg2+ Doping on Electrochemical Properties of LiFePO4 Cathode Materials".ACS APPLIED ENERGY MATERIALS 5.7(2022):8452-8459.