Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Improved Performance of Lithium-Ion Batteries using a Multilayer Cathode of LiFePO4 and LiNi0.8Co0.1Mn0.1O2

  • Hyunchul Kang (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Youngjin Kim (Department of Battery Convergence Engineering, Kangwon National University) ;
  • Taeho Yoon (School of Chemical Engineering, Yeungnam University) ;
  • Junyoung Mun (Department of Energy and Chemical Engineering, Incheon National University)
  • Received : 2023.04.21
  • Accepted : 2023.05.24
  • Published : 2023.11.30
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Abstract

In Li-ion batteries, a thick electrode is advantageous for lowering the inactive current collector portion and obtaining a high energy density. One of the critical failure mechanisms of thick electrodes is inhomogeneous lithiation and delithiation owing to the axial location of the electrode. In this study, it was confirmed that the top layer of the composite electrode contributes more to the charging step owing to the high ionic transport from the electrolyte. A high-loading multilayered electrode containing LiFePO4 (LFP) and LiNi0.8Co0.1Mn0.1O2 (NCM811) was developed to overcome the inhomogeneous electrochemical reactions in the electrode. The electrode laminated with LFP on the top and NCM811 on the bottom showed superior cyclability compared to the electrode having the reverse stacking order or thoroughly mixed. This improvement is attributed to the structural and interfacial stability of LFP on top of the thick electrode in an electrochemically harsh environment.

Keywords

Acknowledgement

This work was supported by the Technology Innovation Program (20010900 and 20011173) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was supported by the ICT R&D program of MSIT/IITP (RS-2023-00221723). T. Yoon was supported by the 2022 Yeungnam University Research Grant.

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