X-ray nanotomography analysis of the microstructural evolution of LiMn2O4 electrodes

JOURNAL OF POWER SOURCES

卷:360

Article

Liu, Zhao¹  Han, Kai^2,3  Chen-Wiegart, Yu-Chen Karen^4,5  Wang, Jiajun⁴  Kung, Harold H.²  Wang, Jun⁴  Barnett, Scott A.¹  Faber, Katherine T.^1,6 

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[2] Northwestern Univ, Dept Chem & Biol Engn, Evanston, IL 60208 USA

[3] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China

[4] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA

[5] SUNY Stony Brook, Dept Mat Sci & Chem Engn, Stony Brook, NY 11794 USA

[6] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

关键词: X-ray nanotomography;    Lithium-ion battery;    Cathode;    Microstructural evolution;    Quantitative analysis;   

DOI  :  10.1016/j.jpowsour.2017.06.027

来源: Elsevier

【 摘 要 】

One of the greatest challenges for advancing lithium-ion battery (LIB) technology is to minimize cell degradation during operation for long-term stability. To this end, it is important to understand how cell performance during operation relates to complex LIB microstructures. In this report, transmission X-ray microscopy (TXM) nanotomography is used to gain quantitative three-dimensional (3D) microstructure performance correlations of LIB cathodes during cycling. The 3D microstructures of LiMn(2)o(4) (LMO) electrodes, cycled under different conditions, including cycle number, operating voltage, and temperature, are characterized via TXM and statistically analyzed to investigate the impact of cycling conditions on the electrode microstructural evolution and cell performance. It is found that the number of cracks formed within LMO particles correlated with capacity fade. For the cell cycled at elevated temperatures, which exhibits the most severe capacity fade among all cells tested, mechanical cracking observed in TXM is not the only dominant contributor to the observed degradation. Mn2+ dissolution, as verified by detection of Mn on the counter electrode by energy dispersive spectrometry, also contributed. The current work demonstrate 3D TXM nanotomography as a powerful tool to help probe in-depth understanding of battery failure mechanisms, which could be applicable to electrode structure optimization for advancing LIB development. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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