Capacity Enhancement of the Quenched Li-Ni-Mn-Co Oxide High-voltage Li-ion Battery Positive Electrode

Anirudha Jena, Cho Hsueh Lee, Wei Kong Pang, Vanessa K. Peterson, Neeraj Sharma, Chun Chieh Wang, Yen Fang Song, Chun Che Lin, Ho Chang, Ru Shi Liu

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Abstract

Li-rich metal oxides, regarded as a high-voltage composite cathode, is currently one of the hottest positive electrode material for lithium-ion batteries, due to its high-capacity and high-energy performance. The crystallography, phase composition and morphology can be altered by synthesis parameters, which can influence drastically the capacity and cycling performance. In this work, we demonstrate Li1.207Ni0.127Mn0.54Co0.127O2, obtained by a co-precipitation method, exhibits super-high specific capacity up to 298 mAh g−1 and excellent capacity retention of ∼100% up to 50 cycles. Using neutron powder diffraction and transmission X-ray microscopy, we have found that the cooling-treatments applied after sintering during synthesis are crucially important in controlling the phase composition and morphology of the cathodes, thereby influencing the electrochemical performance. Unique spherical microstructure, larger lattice, and higher content of Li-rich monoclinic component can be achieved in the rapid quenching process, whereas severe particle cracking along with the smaller lattice and lower monoclinic component content is obtained when natural cooling of the furnace is applied. Combined with electrochemical impedance spectra, a plausible mechanism is described for the poorer specific capacity and cycling stability of the composite cathodes.

Original languageEnglish
Pages (from-to)10-17
Number of pages8
JournalElectrochimica Acta
Volume236
DOIs
Publication statusPublished - May 10 2017
Externally publishedYes

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Keywords

  • Li-rich high voltage cathode
  • neutron powder diffraction
  • quenching
  • transmission X-ray microscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Jena, A., Lee, C. H., Pang, W. K., Peterson, V. K., Sharma, N., Wang, C. C., Song, Y. F., Lin, C. C., Chang, H., & Liu, R. S. (2017). Capacity Enhancement of the Quenched Li-Ni-Mn-Co Oxide High-voltage Li-ion Battery Positive Electrode. Electrochimica Acta, 236, 10-17. https://doi.org/10.1016/j.electacta.2017.03.163