Abstract
Using first-principles pseudopotential calculations within the GGA+U framework, we calculate the elastic constants of orthorhombic olivine LixFePO4 and FePO4. Our results show that olivine LixFePO4 is anisotropic and that directional bulk moduli change significantly during lithiation. LiFePO4 is predicted to be harder and to exhibit a higher Debye temperature than FePO4.

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