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Origin of high capacity and poor cycling stability of Li-rich layered oxides - A long-duration in situ synchrotron powder diffraction study

DOI: 10.1021/acs.chemmater.8b00163 DOI Help

Authors: Karin Kleiner (Technical University of Munich; Diamond Light Source) , Benjamin Strehle (Technical University of Munich) , Annabelle R. Baker (Diamond Light Source) , Sarah J. Day (Diamond Light Source) , Chiu C. Tang (Diamond Light Source) , Irmgard Buchberger (Technical University of Munich) , Frederick-francois Chesneau (BASF SE) , Hubert A. Gasteiger (Technical University of Munich) , Michele Piana (Technical University of Munich)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: May 2018
Diamond Proposal Number(s): 14552 , 15348

Abstract: HE-NCM (High-Energy-NCM, Li1.17Ni0.19Co0.10Mn0.54O2) is a lithium-rich layered oxide with alternating Li- and transition metal- (TM-) layers in which excess lithium-ions replace transition metals in the host structure. HE-NCM offers roughly a 50 mAh g-1 higher capacity compared to conventional layered oxides, but it suffers from capacity loss and voltage fade upon cycling. Differential capacity plots (taken over 100 cycles) show that the origin of the fading phenomenon is a bulk issue rather than a surface degradation. Although previous studies indicate only minor changes in the bulk material, long duration in situ synchrotron X-ray powder diffraction measurements, in combination with difference Fourier analysis of the data, revealed an irreversible transition metal motion within the host structure. The extensive work provides new insights into the fading mechanism of the material.

Subject Areas: Chemistry, Materials, Energy

Instruments: I11-High Resolution Powder Diffraction

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