Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Synergy Effect of K Doping and Nb Oxide Coating on Li1.2Ni0.13Co0.13Mn0.54O2 Cathodes

  • Kim, Hyung Gi (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Park, Yong Joon (Department of Advanced Materials Engineering, Kyonggi University)
  • Received : 2021.01.19
  • Accepted : 2021.03.08
  • Published : 2021.11.28
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Abstract

The Li-rich oxides are promising cathode materials due to their high energy density. However, characteristics such as low rate capability, unstable cyclic performance, and rapid capacity fading during cycling prevent their commercialization. These characteristics are mainly attributed to the phase instability of the host structure and undesirable side reactions at the cathode/electrolyte interface. To suppress the phase transition during cycling and interfacial side reactions with the reactive electrolyte, K (potassium) doping and Nb oxide coating were simultaneously introduced to a Li-rich oxide (Li1.2Ni0.13Co0.13Mn0.54O2). The capacity and rate capability of the Li-rich oxide were significantly enhanced by K doping. Considering the X-ray diffraction (XRD) analysis, the interslab thickness of LiO2 increased and cation mixing decreased due to K doping, which facilitated Li migration during cycling and resulted in enhanced capacity and rate capability. The K-doped Li-rich oxide also exhibited considerably improved cyclic performance, probably because the large K+ ions disturb the migration of the transition metals causing the phase transition and act as a pillar stabilizing the host structure during cycling. The Nb oxide coating also considerably enhanced the capacity and rate capability of the samples, indicating that the undesirable interfacial layer formed from the side reaction was a major resistance factor that reduced the capacity of the cathode. This result confirms that the introduction of K doping and Nb oxide coating is an effective approach to enhance the electrochemical performance of Li-rich oxides.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korean government (MSIT) (No. 2020R1A2C1008370) and supported by the Technology Innovation Program (20007034) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was also supported by Kyonggi University's Graduate Research Assistantship 2020.

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