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The effects of C-rate on the discharge capacities of LiNi1−yMyO2 (M=Ni, Ga, Al and/or Ti) cathodes

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Abstract

LiNi1−yM{y}O{2} specimens with compositions of LiNiO2, LiNi0.975Ga0.025O{2}, LiNi0.975Al0.025O2, LiNi0.995Ti0.005O2 and LiNi0.990Al0.005Ti0.005O2 were synthesized by wet milling and solid-state reaction method. All the synthesized samples possessed the α-NaFeO structure of the rhombohedral system (space group; \(R\bar 3m\)) with no evidence of any impurities. Among the α-LiNiO2 cathodes prepared with the weight ratios of LiNiO2: acetylene black: binder = 85≠10≠5, 85≠12≠3 and 90≠7≠3, the cathode with the weight ratio of 85≠10≠5 had the best cycling performance, with a discharge capacity degradation rate of 1.06 mAh/g/cycle and a discharge capacity at n=20 of 143.5 mAh/g. Among all the samples, LiNi0.990Al0.005Ti0.005O2 had the highest first discharge capacities at 0.1 C, 0.2 C and 0.5 C rates. That sample had the smallest R-factor value, indicating that it had the lowest degree of cation mixing. Among all the samples, LiNi0.975Al0.025O2 showed the lowest rate of decrease in the first discharge capacity with C rate. The first discharge capacities at 0.1 C, 0.2 C and 0.5 C rates were 170.5 mAh/g, 155.0 mAh/g and 124.2 mAh/g, respectively.

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Authors and Affiliations

  1. Division of Advanced Materials Engineering, Nanomaterials Processing Research Center, Engineering Research Institute, 664-14 1ga Deogjindong Deogjingu, 561-756, Jeonju, Korea

    Myoung Youp Song

  2. Department of Materials Engineering, Graduate School, Chonbuk National University, 664-14 1ga Deogjindong Deogjingu, 561-756, Jeonju, Korea

    Chan Kee Park

  3. School of Applied Chemical Engineering, Chonnam National University, 300 Yongbongdong Bukgu, 500-757, Gwangju, Korea

    Soon Do Yoon & Hye Ryoung Park

  4. Department of Chemical Engineering and Materials Science, University of California, 92697-2575, Irvine, CA, USA

    Daniel R. Mumm

Authors
  1. Myoung Youp Song
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  2. Chan Kee Park
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  3. Soon Do Yoon
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  4. Hye Ryoung Park
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  5. Daniel R. Mumm
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Correspondence to Myoung Youp Song.

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Song, M.Y., Park, C.K., Yoon, S.D. et al. The effects of C-rate on the discharge capacities of LiNi1−yMyO2 (M=Ni, Ga, Al and/or Ti) cathodes. Electron. Mater. Lett. 5, 151–155 (2009). https://doi.org/10.3365/eml.2009.12.151

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