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Importance of capacity balancing on the electrochemical performance of Li[Ni0.8Co0.1Mn0.1]O2 (NCM811)/silicon full cells

Reuter F, Baasner A, Pampel J, Piwko M, Doerfler S, Althues H, Kaskel S (2019)

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Publication Type: Journal article

Publication year: 2019

Journal

Book Volume: 166

Pages Range: A3265-A3271

Journal Issue: 14

DOI: 10.1149/2.0431914jes

Abstract

In recent years, both silicon thin films and nickel-rich layered oxides have received much attention as promising anode or cathode materials for next generation lithium ion batteries, respectively. In this work, full cells containing Li[Ni0.8Co0.1Mn0.1]O2 (NCM811) as cathode in combination with amorphous columnar silicon thin films as anode are evaluated in coin cells and 3-electrode cells with varying capacity balancing. Full cells with area capacity ratios of negative to positive electrodes (n/p-ratio) reaching from 1.15: 1 to 2.70: 1 are studied. The cells with a high n/p-ratio (2.00: 1 and 2.70: 1) show significantly lower specific capacity of 115 mA h gNCM ⁻¹ after 50 cycles of galvanostatic cycling in comparison to 130 mA h gNCM ⁻¹ for a cell with a n/p-ratio of 1.15: 1. One reason for this phenomenon is the decline of the initial coulombic efficiency with increasing n/p-ratios. Secondly, through only partial utilization of the silicon anode by using high n/p-ratios, the anode potential is increased at the end of charge. This leads to a higher cathode potential and therefore a faster degradation of the cell. In summary, for designing high performance NCM811/Si full cells, high n/p-ratios should be avoided.

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How to cite

APA:

Reuter, F., Baasner, A., Pampel, J., Piwko, M., Doerfler, S., Althues, H., & Kaskel, S. (2019). Importance of capacity balancing on the electrochemical performance of Li[Ni0.8Co0.1Mn0.1]O2 (NCM811)/silicon full cells. Journal of The Electrochemical Society, 166(14), A3265-A3271. https://doi.org/10.1149/2.0431914jes

MLA:

Reuter, Florian, et al. "Importance of capacity balancing on the electrochemical performance of Li[Ni0.8Co0.1Mn0.1]O2 (NCM811)/silicon full cells." Journal of The Electrochemical Society 166.14 (2019): A3265-A3271.

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