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

Journal Article


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.

UOW Authors


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

Publication Date


  • 2017

Citation


  • Jena, A., Lee, C., Pang, W., Peterson, V. K., Sharma, N., Wang, C., Song, Y., Lin, C., Chang, H. & Liu, R. (2017). Capacity Enhancement of the Quenched Li-Ni-Mn-Co Oxide High-voltage Li-ion Battery Positive Electrode. Electrochimica Acta, 236 10-17.

Scopus Eid


  • 2-s2.0-85016260738

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2455

Number Of Pages


  • 7

Start Page


  • 10

End Page


  • 17

Volume


  • 236

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.

UOW Authors


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

Publication Date


  • 2017

Citation


  • Jena, A., Lee, C., Pang, W., Peterson, V. K., Sharma, N., Wang, C., Song, Y., Lin, C., Chang, H. & Liu, R. (2017). Capacity Enhancement of the Quenched Li-Ni-Mn-Co Oxide High-voltage Li-ion Battery Positive Electrode. Electrochimica Acta, 236 10-17.

Scopus Eid


  • 2-s2.0-85016260738

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2455

Number Of Pages


  • 7

Start Page


  • 10

End Page


  • 17

Volume


  • 236