Mechanism of Capacity Fading in the LiNi 0.8 Co 0.1 Mn 0.1 O 2 Cathode Material for Lithium-Ion Batteries

Yong-keon Ahn, Yong Nam Jo, Woosuk Cho, Ji-Sang Yu and Ki Jae Kim
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Yong-keon Ahn: Department of Energy Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
Yong Nam Jo: Advanced Batteries Research Center, Korea Electronics Technology Institute, 25, Saenari-ro, Bundang-gu, Seongnam, Gyeonggi-do 13509, Korea
Woosuk Cho: Advanced Batteries Research Center, Korea Electronics Technology Institute, 25, Saenari-ro, Bundang-gu, Seongnam, Gyeonggi-do 13509, Korea
Ji-Sang Yu: Advanced Batteries Research Center, Korea Electronics Technology Institute, 25, Saenari-ro, Bundang-gu, Seongnam, Gyeonggi-do 13509, Korea
Ki Jae Kim: Department of Energy Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea

Energies, 2019, vol. 12, issue 9, 1-10

Abstract: Understanding the capacity fading mechanism of the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode materials is crucial for achieving long-lasting lithium-ion batteries with high energy densities. In this study, we investigated the factors affecting the capacity fading of NCM811 during repeated cycling at high temperatures. We found that the change in the c-axis length during charging and discharging is the main cause of the formation and propagation of microcracks in the primary particles of NCM811. In addition, the electrolyte is decomposed on the microcrack surfaces and, consequently, by-products are formed on the particle surface, increasing the impedance and resulting in poor electronic and ionic connectivity between the primary particles of NCM811. In addition, the transition metals in the NCM811 cathode material are dissolved in the electrolyte from the newly formed microcrack surface between primary particles. Therefore, the electrolyte decomposition and transition metal dissolution on the newly formed surface are the major deteriorative effects behind the capacity fading in NCM811.

Keywords: microcrack; structural stability; capacity fading; NCM811; Ni-rich cathode material (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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