Lithium maximum entropy method

The first analysis performed for the Lio,6FeP04 solid-solution phase at 620 K was the Rietveld refinement for the neutron diffraction profile and the resultant pattern is summarized in Fig. 14.12b. To evaluate the dynamic disorder of lithium, maximum entropy method (MEM) was applied to estimate the neutron scattering length density distribution, which corresponds to the nuclear density distribution. 

Once the mechanisms of charge carrier formation are understood, the next important information is the geometry of the charge movement. Successful visualization of lithium diffusion path in olivine Li FeP04 will be demonstrated together with its methodology by combination of neutron diffraction and maximum entropy method. This is a first experimental visualization of ion motion in any battery electrode. 

By applying maximum entropy methods to the diffraction data this analysis obtained a fuller picture of the lithium distribution than could be extracted from a conventional refinement of the structure. 

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