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无机材料学报

无机材料学报 ›› 2021, Vol. 36 ›› Issue (9): 999-1005.DOI: 10.15541/jim20200576 CSTR: 32189.14.10.15541/jim20200576

• 研究快报 • 上一篇    下一篇

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

王影1(), 张文龙1, 邢彦锋1(), 曹苏群2, 戴新义3, 李晶泽4()   

  1. 1.上海工程技术大学 机械与汽车工程学院, 上海 201620
    2.淮阴工学院 电子信息工程学院, 淮安 223003
    3.贵州大学 材料与冶金学院, 贵阳 550025
    4.电子科技大学 微电子学与固体电子学院, 成都 610054

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. 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)

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摘要：

长期以来, 表面包覆一直是改善锂离子电池电极材料电化学性能的有效手段。本研究采用磁控溅射法将非晶态磷酸锂包覆在Li4Ti5O12电极片表面, 修饰后电极表面光滑, 形成了均匀的非晶态磷酸锂包覆层。在0.01-3.00 V电压范围的充放电测试结果显示, 该包覆层可显著改善电极的倍率性能和循环性能。当充放电电流密度分别为35和1750 mA∙g-1时, 电池容量可以达到265和151 mAh∙g-1, 远高于未包覆电池的240和22 mAh∙g-1, 并以88 mA∙g-1的电流密度进一步充放电200个循环后, 仍保留了238 mAh∙g-1的高可逆容量。这是由于非晶态磷酸锂包覆层可稳定电解质界面, 保持粒子间电子通道的完整性, 并在电极表面形成交联离子导电网络, 使得改性电极的倍率性能和循环稳定性显著提高。

关键词: 钛酸锂, 磷酸锂, 阳极, 锂离子电池, 磁控溅射

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

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