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Nanoparticle shapes of LiMnPO4, Li+ diffusion orientation and diffusion coefficients for high volumetric energy Li+ ion cathodes

  • Kwon, Nam Hee University of Fribourg, Department of Chemistry, Fribourg, Switzerland
  • Yin, Hui University of Fribourg, Department of Chemistry, Fribourg, Switzerland
  • Vavrova, Tatiana University of Fribourg, Department of Chemistry, Fribourg, Switzerland
  • Lim, Jonathan H-W. Cavendish Laboratory, Department of Physics, University of Cambridge, United Kingdom
  • Steiner, Ullrich Adolphe Merkle Institute - Soft Matter Physics Group, Fribourg, Switzerland
  • Grobéty, Bernard University of Fribourg, Department of Geosciences, Switzerland
  • Fromm, Katharina M. University of Fribourg, Department of Chemistry, Fribourg, Switzerland
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    28.02.2017
Published in:
  • Journal of Power Sources. - 2017, vol. 342, p. 231–240
English Nanoparticles of LiMnPO₄ were fabricated in rod, elongated as well as cubic shapes. The 1D Li⁺ preferred diffusion direction for each shape was determined via electron diffraction spot patterns. The shape of nano-LiMnPO₄ varied the diffusion coefficient of Li⁺ because the Li⁺ diffusion direction and the path length were different. The particles with the shortest dimension along the b-axis provided the highest diffusion coefficient, resulting in the highest gravimetric capacity of 135, 100 and 60 mAh g⁻¹ at 0.05C, 1C and 10C, respectively. Using ball-milling, a higher loading of nano-LiMnPO₄ in the electrode was achieved, increasing the volumetric capacity to 263 mAh cm⁻³, which is ca. 3.5 times higher than the one obtained by hand-mixing of electrode materials. Thus, the electrochemical performance is governed by both the diffusion coefficient of Li⁺, which is dependent on the shape of LiMnPO₄ nanoparticles and the secondary composite structure.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie, Département de Géosciences, AMI - Physique de la matière molle
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/305527
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