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Effects of surface area on electrochemical performance of Li[Ni0.2Li0.2Mn0.6]O2 cathode material

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Abstract

The effect of surface area on the electrochemical properties and thermal stability of Li[Ni0.2Li0.2Mn0.6]O2 powders was characterized using a charge/discharge cycler and DSC (Differential Scanning Calorimeter). The surface area of the samples was successfully controlled from ~4.0 to ~11.7 m2 g−1 by changing the molar ratio of the nitrate/acetate sources and adding an organic solvent such as acetic acid or glucose. The discharge capacity and rate capability was almost linearly increased with increase in surface area of the sample powder. A sample with a large surface area of 9.6–11.7 m2 g−1 delivered a high discharge capacity of ~250 mAh g−1 at a 0.2 C rate and maintained 62–63% of its capacity at a 6 C rate versus a 0.2 C rate. According to the DSC analysis, heat generation by thermal reaction between the charged electrode and electrolyte was not critically dependent on the surface area. Instead, it was closely related to the type of organic solvent employed in the fabrication process of the powder.

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Acknowledgement

This work was supported by the Korean Ministry of Information and Communication (Project No. 2006-S-006).

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Kyonggi University, Suwon, Gyeonggi-do, 443-760, South Korea

    Jea Hyeok Ryu, Bo Gun Park, Seuk Buom Kim & Yong Joon Park

  2. Division of Advanced Industrial Engineering, Kyonggi University, San 94-6, Yiui-dong, Yeongtong-gu, Suwon, Gyeonggi-do, 443-760, South Korea

    Yong Joon Park

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  1. Jea Hyeok Ryu
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  2. Bo Gun Park
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  3. Seuk Buom Kim
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  4. Yong Joon Park
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Correspondence to Yong Joon Park.

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Ryu, J.H., Park, B.G., Kim, S.B. et al. Effects of surface area on electrochemical performance of Li[Ni0.2Li0.2Mn0.6]O2 cathode material. J Appl Electrochem 39, 1059–1066 (2009). https://doi.org/10.1007/s10800-008-9757-2

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  • DOI: https://doi.org/10.1007/s10800-008-9757-2

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