无机材料学报2021，Vol.36Issue(9)：999-1005,7.DOI:10.15541/jim20200576
非晶态磷酸锂包覆钛酸锂电极在0.01～3.00 V电压范围的性能研究
Performance of Amorphous Lithium Phosphate Coated Lithium Titanate Electrodes in Extended Working Range of 0.01–3.00 V
摘要
Abstract
Surface coating has long been an effective means to improve the electrochemical performance of electrode materials for Li-ion batteries. In this study, the traditional micron-sized Li4Ti5O12 anodes are coated with amorphous lithium phosphate by radio frequency (RF) magnetron sputtering. The characterized morphology indicates that the electrodes are covered by a thin amorphous lithium phosphate coating layer, showing a very smooth surface. Both the rate performance and cycle performance of the electrodes are enhanced markedly by the coating layer in the voltage range of 0.01–3.00 V. When the discharge-charge currents are 35 and 1750 mA·g–1, the capacities are elevated to 265 and 151 mAh·g–1, respectively, which are higher than those of the uncoated ones (240 and 22 mAh·g–1). After further discharge-charged for 200 cycles at 88 mA·g–1, the coated electrodes still maintain a high reversible capacity of 238 mAh·g–1. This result clearly suggests that the thin layer can stabilize the solid electrolyte interface, maintain the integrity of the interparticle electronic passage and form a cross-linked ionic conducting network for Li4Ti5O12 grains on the surface.关键词
钛酸锂/磷酸锂/阳极/锂离子电池/磁控溅射Key words
lithium titanate/amorphous lithium phosphate/anode/lithium-ion battery/magnetron sputtering分类
信息技术与安全科学引用本文复制引用
王影,张文龙,邢彦锋,曹苏群,戴新义,李晶泽..非晶态磷酸锂包覆钛酸锂电极在0.01～3.00 V电压范围的性能研究[J].无机材料学报,2021,36(9):999-1005,7.基金项目
National Natural Science Foundation of China(51575335) （51575335）
Program for New Century Excellent Talents in University(NCET-10-0296) （NCET-10-0296）
Science and Technology Commission of Shanghai Municipality(16030501300) （16030501300）
Open fund of Jiangsu Laboratory of Lake Environment Remote Sensing Technologies(JSLERS-2019-003) （JSLERS-2019-003）
Open Project of Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures(2019-002) （2019-002）
