Journal
CHEMISTRY OF MATERIALS
Volume 22, Issue 3, Pages 1242-1248Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm902720z
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Funding
- EPSRC [EP/D031672/1]
- EPSRC [EP/H019596/1, EP/F067496/1, EP/D031672/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D031672/1, EP/F067496/1, EP/H019596/1] Funding Source: researchfish
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Olivine-type phosphates have attracted considerable attention as cathode materials for rechargeable lithium batteries. Here, the defect and ion transport properties of the mixed-metal material LiFe0.5Mn0.5PO4 are investigated by atomistic modeling methods. The intrinsic defect type with the lowest energy is the cation antisite defect, in which Li and Fe/Mn ions exchange positions. As found in the LiFePO4 material, lithium ion diffusion in the mixed-metal system occurs down the b-axis channels following a curved path. Migration energies for Fe and Mn antisite cations on Li sites suggest that Mn defects Would Impede bulk Li mobility in LiFe0.5Mn0.5PO4 to a greater extent than Fe antisite defects in LiFePO4. Association or binding energies for various defect Clusters comprised of lithium vacancies and/or antisite cations arc examined.
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