Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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One-Step β-Li2SnO3 Coating on High-nickel Layered Oxides via Thermal Phase Segregation for Li-ion Batteries

  • Seongmin Kim (Institute of Chemical Processes, Seoul National University) ;
  • Hanseul Kim (Institute of Chemical Processes, Seoul National University) ;
  • Sung Wook Doo (Institute of Chemical Processes, Seoul National University) ;
  • Hee-Jae Jeon (Department of Mechanical and Biomedical Engineering, Kangwon National University) ;
  • In Hye Kim (College of Engineering, Interdisciplinary Program in Advanced Functional Materials and Devices Development, Kangwon National University) ;
  • Hyun-seung Kim (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Youngjin Kim (College of Engineering, Interdisciplinary Program in Advanced Functional Materials and Devices Development, Kangwon National University)
  • Received : 2023.02.22
  • Accepted : 2023.04.24
  • Published : 2023.08.31
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Abstract

The global energy storage markets have gravitated to high-energy-density and low cost of lithium-ion batteries (LIBs) as the predominant system for energy storage such as electric vehicles (EVs). High-Ni layered oxides are considered promising next-generation cathode materials for LIBs owing to their significant advantages in terms of high energy density. However, the practical application of high-Ni cathodes remains challenging, because of their structural and surface instability. Although extensive studies have been conducted to mitigate these inherent instabilities, a two-step process involving the synthesis of the cathode and a dry/wet coating is essential. This study evaluates a one-step β-Li2SnO3 layer coating on the surface of LiNi0.8Co0.2O2 (NC82) via the thermal segregation of Sn owing to the solubility limit with respect to the synthesis temperature. The doping, segregation, and phase transition of Sn were systematically revealed by structural analyses. Moreover, surface-engineered 5 mol% Sn-coated LiNi0.8Co0.2O2 (NC82_Sn5%) exhibited superior capacity retention compared to bare NC82 owing to the stable surface coating layer. Thus, the developed one-step coating method is suitable for improving the properties of high-Ni layered oxide cathode materials for application in LIBs.

Keywords

Acknowledgement

We acknowledge the support from a HRD Program for Industrial Innovation (P0012748) by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE), Ministry of Trade, Industry & Energy/Korea Evaluation Institute of Industrial Technology (MOTIE/KEIT) (Nos. 20010900) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF2022M3J1A1085408). This research was also supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE)(2022RIS-005).

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