Performance of Amorphous Lithium Phosphate Coated Lithium Titanate Electrodes in Extended Working Range of 0.01-3.00 V

doi:10.15541/jim20200576

Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (9): 999-1005.DOI: 10.15541/jim20200576

• RESEARCH LETTER • Previous Articles Next Articles

Performance of Amorphous Lithium Phosphate Coated Lithium Titanate Electrodes in Extended Working Range of 0.01-3.00 V

WANG Ying¹(), ZHANG Wenlong¹, XING Yanfeng¹(), CAO suqun², DAI Xinyi³, LI Jingze⁴()

1. School of Mechanical and Automobile Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
2. Faculty of Electronic Information Engineering, Huaiyin Institute of Technology, Huaian 223003, China
3. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
4. School of Microelectronics and Solid-state Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

Received:2020-09-30 Revised:2021-01-07 Published:2021-09-20 Online:2021-01-25
Contact: XING Yanfeng, professor. E-mail: smsmsues@163.com; LI Jingze, professor. E-mail: lijingze@uestc.edu.cn
About author:WANG Ying (1978-), female, lecturer. E-mail: wangyingcae@sues.edu.cn
Supported by:
National Natural Science Foundation of China(51575335);Program for New Century Excellent Talents in University(NCET-10-0296);Science and Technology Commission of Shanghai Municipality(16030501300);Open fund of Jiangsu Laboratory of Lake Environment Remote Sensing Technologies(JSLERS-2019-003);Open Project of Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures(2019-002)

Abstract

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.

Key words: lithium titanate, amorphous lithium phosphate, anode, lithium-ion battery, magnetron sputtering

CLC Number:

TM912

WANG Ying, ZHANG Wenlong, XING Yanfeng, CAO suqun, DAI Xinyi, LI Jingze. Performance of Amorphous Lithium Phosphate Coated Lithium Titanate Electrodes in Extended Working Range of 0.01-3.00 V[J]. Journal of Inorganic Materials, 2021, 36(9): 999-1005.

Figures/Tables 11

References 24

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Sample	Cycle No.	R_s/Ω	R_f1/Ω	R_f2/Ω	R_ct/Ω
LTOLPO00	10	5	15	-	86
LTOLPO20	10	5	21	180	54
LTOLPO00	100	5	364	-	1019
LTOLPO20	100	7	25	146	216

Sample	Cycle No.	R_s/Ω	R_f1/Ω	R_f2/Ω	R_ct/Ω
LTOLPO00	10	5	15	-	86
LTOLPO20	10	5	21	180	54
LTOLPO00	100	5	364	-	1019
LTOLPO20	100	7	25	146	216

Performance of Amorphous Lithium Phosphate Coated Lithium Titanate Electrodes in Extended Working Range of 0.01-3.00 V

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