Journal of Electrochemical Science and Technology
- Volume 11 Issue 4
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- Pages.352-360
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- 2020
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- 2093-8551(pISSN)
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- 2288-9221(eISSN)
DOI QR Code
Effect of Particle Size and Doping on the Electrochemical Characteristics of Ca-doped LiCoO2 Cathodes
- Hasan, Fuead (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University) ;
- Kim, Jinhong (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University) ;
- Song, Heewon (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University) ;
- Lee, Seon Hwa (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University) ;
- Sung, Jong Hun (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University) ;
- Kim, Jisu (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University) ;
- Yoo, Hyun Deog (Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University)
- 투고 : 2020.04.01
- 심사 : 2020.05.11
- 발행 : 2020.11.30
초록
Lithium cobalt oxide (LiCoO2, LCO) has been widely used as a cathode material for Li-ion batteries (LIBs) owing to its excellent electrochemical performance and highly reproducible synthesis even with mass production. To improve the energy density of the LIBs for their deployment in electro-mobility, the full capacity and voltage of the cathode materials need to exploited, especially by operating them at a higher voltage. Herein, we doped LCO with divalent calcium-ion (Ca2+) to stabilize its layered structure during the batteries' operation. The Ca-doped LCO was synthesized by two different routes, namely solid-state and co-precipitation methods, which led to different average particle sizes and levels of dopant's homogeneity. Of these two, the solid-state synthesis resulted in smaller particles with a better homogeneity of the dopant, which led to better electrochemical performance, specifically when operated at a high voltage of 4.5 V. Electrochemical simulations based on a single particle model provided theoretical corroboration for the positive effects of the reduced particle size on the higher rate capability.