有色金属科学与工程2025，Vol.16Issue(1)：35-42,8.DOI:10.13264/j.cnki.ysjskx.2025.01.005
钛掺杂磷酸铁锂的合成及其充放电性能研究
Synthesis and charge/discharge performances of titanium doped lithium iron phosphate
摘要
Abstract
Element doping is one of the main ways to improve the charge/discharge performances of lithium iron phosphate(LiFePO4)cathode materials.In this paper,modified LiFePO4 was synthesized by a high-temperature solid-state reduction method using TiO2 as a titanium source.The structural composition,micro-morphology,and physicochemical properties of titanium-doped LiFePO4 were characterized by XRD,XPS,SEM,and BET,and further,the relationship between composition-structure and charge/discharge performances was carefully studied.The results indicate that the first discharge-specific capacity of titanium doped LiFePO4 respectively reaches the maximum of 161.9 and 150.8 mAh/g at 0.1 C and 1 C rate,which is 4.72%and 7.48%higher than LiFePO4 without titanium doping,and the capacity retention rate achieves as high as 98.54%after 150 cycles at 1 C rate.This is mainly attributed to the substitution of Fe2+by Ti4+into LiFePO4 lattice,which stabilizes the crystal structure and inhibits the secondary growth of crystalline grains,leading to a decrease in Li+extraction/insertion paths and an increase in migration efficiency,thereby improving the discharge specific capacity,rate,and cycle performances of LiFePO4.关键词
钛掺杂/磷酸铁锂/充放电性能Key words
titanium doping/lithium iron phosphate/charge/discharge performances分类
动力与电气工程引用本文复制引用
吴彭森,王洋,葛佳佳,李紫金,李珍珍,邱冠周..钛掺杂磷酸铁锂的合成及其充放电性能研究[J].有色金属科学与工程,2025,16(1):35-42,8.基金项目
河南省"十四五"重大项目资助(豫重点[2022]5号) （豫重点[2022]5号）
