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http://dx.doi.org/10.5229/JKES.2022.25.4.184

Enhanced Cycle Performance of Bi-layer Structured LMO-NCM Positive Electrode at Elevated Temperature  

Yoo, Seong Tae (Department of Chemical Engineering and Biotechnology, Tech University of Korea)
Ryu, Ji Heon (Graduate School of Knowledge-based Technology and Energy, Tech University of Korea)
Publication Information
Journal of the Korean Electrochemical Society / v.25, no.4, 2022 , pp. 184-190 More about this Journal
Abstract
Spinel LiMn2O4 (LMO) and layered LiNi0.5Co0.2Mn0.3O2 (NCM) are widely used as positive electrode materials for lithium-ion batteries. LMO and NCM positive electrode materials have a complementary properties. LMO has low cost and high safety and NCM materials show a relatively high specific capacity and better cycle life even at elevated temperature. Therefore, the LMO and NCM active materials are blended and used as a positive electrode in large-size batteries for electric vehicles (xEV). In this study, the cycle performance of a blended electrode prepared by simply mixing LMO and NCM and a bi-layer electrode in which two electrode layers aree sequentially coated are compared. The bi-layer electrode prepared by composing the same ratio of both active materials has similar capacity and cycle performance to the blend electrode. However, the LN electrode coated with LMO first and then NCM is the best in the full cell cycle performance at elevated temperature, and the NL electrode, in which NCM is first coated with LMO has a faster capacity degradation than the blended electrode because LMO is mainly located on the top of the electrode adjacent to electrolyte and graphite negative electrode. Also, the LSTA (linear sweep thermmametry) analysis results show that the LN bi-layer electrode in which the LMO is located inside the electrode has good thermal stability.
Keywords
Blended electrode; Bi-layer electrode; Cycle performance; Lithium-ion batteries;
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