Abstract
Delithiation is a basic step in the operation of the Li ion battery and it involves the extraction of Li ions from the lattice of the cathode material and insertion into the lattice of the anode. LiFePO4 is a cathode material whose wide application in high energy Li ion batteries, is limited by low ion and electron diffusion [1]. Partially delithiated LiFePO4 grains are known to exist in a two phase state characterized by the delithiated, Li1−xFePO4 and lithiated LiFePO4 phases. It has been proposed that poor mobility of Li ions across the interface between these two phases plays an important role in limiting Li diffusion within the LiFePO4 grain [3]. Therefore, investigating the two-phase domains in LiFePO4 is a crucial step towards a better understanding of the Li diffusion in LiFePO4.
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