A modified LiF coating process to enhance the electrochemical performance characteristics of LiNi0.8Co0.1Mn0.1O2 cathode materials

作者：Xiong, Xunhui; Wang, Zhixing^*; Yin, Xing; Guo, Huajun; Li, Xinhai

来源：Materials Letters, 2013, 110: 4-9.

DOI：10.1016/j.matlet.2013.07.098

• Lithium ion battery
• LiNi0.8Co0.1Mn0.1O2
• Electrochemical performance
• Powder technology
• Particles
• Surfaces

NH4F has been used to precipitate the lithium residue on surface of LiNi0.8Co0.1Mn0.1O2 and the in-situ precipitated LiF works as HF inhibitor during cycling, thus LiF-modified LiNi0.8Co0.1Mn0.1O2 exhibits noticeably enhanced rate capability and cycling performance compared with the pristine material. The capacity retention of LiF-modified LiNi0.8Co0.1Mn0.1O2 shows only 17.8% capacity loss after 200 cycles, while the pristine electrode suffers from 28.2% capacity loss and the improvement of cycling performance at 60 degrees C is more significant. XRD, TEM, EDX and XPS are used to demonstrate that LiF is in-situ coated on LiNi0.8Co0.1Mn0.1O2. HF titration and EIS analysis were adapted to demonstrate the role of LiF prepared by this modified process.

• 出版日期2013-11-1
• 单位中南大学