Evaluating lithium diffusion mechanisms in the complex spinel LiNiGeO

Lithium-ion diffusion mechanisms in the complex spinel Li 2 NiGe 3 O 8 have been investigated using solid-state NMR, impedance, and muon spectroscopies. Partial occupancy of migratory interstitial 12 d sites is shown to occur at lower temperatures than previously reported. Bulk activation energies f...

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Published in:Physical chemistry chemical physics : PCCP 2019-10, Vol.21 (41), p.23111-23118
Main Authors: Martin, Daniel Z. C, Haworth, Abby R, Schmidt, Whitney L, Baker, Peter J, Boston, Rebecca, Johnston, Karen E, Reeves-McLaren, Nik
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Summary:Lithium-ion diffusion mechanisms in the complex spinel Li 2 NiGe 3 O 8 have been investigated using solid-state NMR, impedance, and muon spectroscopies. Partial occupancy of migratory interstitial 12 d sites is shown to occur at lower temperatures than previously reported. Bulk activation energies for Li + ion hopping range from 0.43 0.03 eV for powdered samples to 0.53 0.01 eV for samples sintered at 950 C for 24 h, due to the loss of Li during sintering at elevated temperatures. A lithium diffusion coefficient of 3.89 10 12 cm 2 s 1 was calculated from muon spectroscopy data for Li 2 NiGe 3 O 8 at 300 K. Li + -ion diffusion in the all-solid-state battery electrolyte candidate material Li 2 NiGe 3 O 8 was investigated and D Li = 3.89 10 12 cm 2 s 1 calculated.
ISSN:1463-9076
1463-9084
DOI:10.1039/c9cp02907a