文献类型：期刊文献

英文题名：Crystal structure, morphology, and electrical properties of aluminum-doped LFP materials

作者：Zou, Gongsheng[1];Chen, Kui[1];Luo, Xianming[2];Fu, Quanjun[2];Wu, Bin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Sichuan Lomon Phosphorus Chem Ind Ltd, Mianzhu 618209, Sichuan, Peoples R China

年份：2024

卷号：30

期号：6

起止页码：3431

外文期刊名：IONICS

收录：;EI(收录号：20241415841582);WOS:【SCI-EXPANDED(收录号:WOS:001194951900004)】；

基金：No Statement Available

语种：英文

外文关键词：High temperature solid phase method; LFP; Aluminum doping; Anionic radical doping

摘要：The effect of doping with aluminum compounds on the crystal structure, morphology, and electrochemical properties of LiFePO4 has been investigated with aluminum stearate, alumina, aluminum sulfate, and aluminum phosphate as dopants. The contraction of unit cell observed by XRD analysis and reduced lattice spacing determined by HRTEM of the doped crystals indicate that Al3+ ions, which occupy smaller space than lithium ions, are successfully doped into the lattice of LiFePO4. Lattice doping of aluminum ions enlarges Li+ transport channels; 1%-AlP-LFP has the slowest attenuation of discharge specific capacity. After 30 cycles of charge and discharge curve test at 0.5C, the retention rate of the sample is 97.43%. Owing to the substitution of S for O sites, and SO4 2- has a breaking effect on the carbon layer, this accelerates the capacity decay of 1%-AlS-LFP. The discharge capacity of 1%-AlS-LFP is 132.9 mAh/g, which is lower than 139.8mAh/g of LFP. The electrochemical impedance spectroscopy (EIS) results show that the resistance of 1%-AlP-LFP is 147.1 omega, the resistance of LFP is 138.9 omega, and the resistance of LFP is 183.9 omega. The Li+ diffusion coefficient of 1%-AlP-LFP is partially increased; the double substitution of Al3+ and S2- slows the migration rate of Li+.