中文

Journal of Shanghai University（Natural Science Edition） ›› 2023, Vol. 29 ›› Issue (2): 312-.doi: 10.12066/j.issn.1007-2861.2319

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Modification of LiNi0.8Co0.1Mn0.1O2 cathode material with ultra-thin TiO2 coating by atomic layer deposition

Zhu Mingyuan,LIU Wenbon,LI Ying,LIU Yang,LI Wenxian,ZHANG Jiujun   

  1. 1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. Institute of Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China
  • Accepted:2021-06-07 Online:2023-04-30 Published:2023-04-30

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Abstract: The nickel-rich cathode, LiNixCoyMn1−x−yO2 (NCM, ω(Ni)>60%), suffers from phase transitions on the surface of particles during cycling that cause the electrolyte by-product HF to corrode the material and cause the dissolution of transition metal ions. These problems seriously affect the application of NCMs. In this study, atomic layer deposition (ALD) was used to uniformly deposit a TiO2 coating on the surface of a LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material to improve its electrochemical performance. The results demonstrated a significant improvement in the performance of NCM811 after ALD of TiO2. The ultra-thin TiO2 coating hindered direct contact between the NCM811 active particles and the electrolyte, which improved the cycle stability of the NCM811. The ultra-thin coating did not affect the transmission of lithium ion during cycling. This method for ALD opens a new avenue for the surface modification of electrode materials.

Key words: LiNi0.8Co0.1Mn0.1O2(NCM811), atomic layer deposition (ALD), lithium ion battery, cathode material, TiO2

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