Crystal Orientation Tuning
of LiFePO<sub>4</sub> Nanoplates
for High Rate Lithium Battery Cathode Materials
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Abstract
We report the crystal orientation tuning of LiFePO<sub>4</sub> nanoplates
for high rate lithium battery cathode materials. Olivine LiFePO<sub>4</sub> nanoplates can be easily prepared by glycol-based solvothermal
process, and the largest crystallographic facet of the LiFePO<sub>4</sub> nanoplates, as well as so-caused electrochemical performances,
can be tuned by the mixing procedure of starting materials. LiFePO<sub>4</sub> nanoplates with crystal orientation along the <i>ac</i> facet and <i>bc</i> facet present similar reversible capacities
of around 160 mAh g<sup>–1</sup> at 0.1, 0.5, and 1 C-rates
but quite different ones at high C-rates. The former delivers 156
mAh g<sup>–1</sup> and 148 mAh g<sup>–1</sup> at 5 C-rate
and 10 C-rate, respectively, while the latter delivers 132 mAh g<sup>–1</sup> and only 28 mAh g<sup>–1</sup> at 5 C-rate
and 10 C-rate, respectively, demonstrating that the crystal orientation
plays important role for the performance of LiFePO<sub>4</sub> nanoplates.
This paves a facile way to prepare high performance LiFePO<sub>4</sub> nanoplate cathode material for lithium ion batteries