KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Performances of Li-Ion Batteries Using LiNi1-x-yCoxMnyO2 as Cathode Active Materials in Frequency Regulation Application for Power Systems

  • Choi, Jin Hyeok (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Kwon, Soon-Jong (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Lim, Jungho (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Lim, Ji-Hun (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Lee, Sung-Eun (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Park, Kwangyong (KEPCO Research Institute, Korea Electric Power Corporation)
  • Received : 2020.03.25
  • Accepted : 2020.04.10
  • Published : 2020.12.30
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Abstract

There are many application fields of electrical energy storage such as load shifting, integration with renewables, frequency or voltage supports, and so on. Especially, the frequency regulation is needed to stabilize the electric power system, and there have to be more than 1 GW as power reserve in Korea. Ni-rich layered oxide cathode materials have been investigated as a cathode material for Li-ion batteries because of their higher discharge capacity and lower cost than lithium cobalt oxide. Nonetheless, most of them have been investigated using small coin cells, and therefore, there is a limit to understand the deterioration mode of Ni-rich layered oxides in commercial high energy Li-ion batteries. In this paper, the pouch-type 20 Ah-scale Li-ion full cells are fabricated using Ni-rich layered oxides as a cathode and graphite as an anode. Above all, two test conditions for the application of frequency regulation were established in order to examine the performances of cells. Then, the electrochemical performances of two types of Ni-rich layered oxides are compared, and the long-term performance and degradation mode of the cell using cathode material with high nickel contents among them were investigated in the frequency regulation conditions.

Keywords

Acknowledgement

This work was supported by Korea Electric Power Corporation under Grant R17TA08.

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