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

• NH4F is used to precipitate the lithium residue on surface of LiNi0.8Co0.1Mn0.1O2.
• LiF-modified LiNi0.8Co0.1Mn0.1O2 exhibits noticeably enhanced performance.
• In-situ precipitated LiF works as HF inhibitor during cycling.

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 °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.

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 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 °C is more significant. HF titration and EIS analysis was adapted to demonstrate the role of LiF prepared by this modified process.Figure optionsDownload as PowerPoint slide