期刊
CHEMISTRY OF MATERIALS
卷 23, 期 15, 页码 3556-3563出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm201429f
关键词
spinels; conduction pathways; solid electrolyte; lithium-ion battery materials
资金
- EPSRC
- Engineering and Physical Sciences Research Council [EP/G005001/1] Funding Source: researchfish
- EPSRC [EP/G005001/1] Funding Source: UKRI
Crystal structures of Li2MGe3O8 (M = Ni or Zn), in space group P4(3)32, have been refined by application of the Rietveld method to variable-temperature time-of-flight neutron powder diffraction data. Difference Fourier maps, calculated using data collected at high temperatures, showed significant negative density centered at positions vacant at ambient temperatures. In Li2NiGe3O8, conduction involves three-dimensional 8c-12d-8c site hopping, facilitated by harmonic oscillations of oxygen atoms away from their ideal positions. For Li2ZnGe3O8, the pathway involves a more complex 4b-24e-4a-24e-4b mechanism.
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