Hierarchy concomitant in situ stable iron(II)−carbon source manipulation using ferrocenecarboxylic acid for hydrothermal synthesis of LiFePO4 as high-capacity battery cathode
作者： Hoxin Yen , Rupesh Rohan , Chun-Yu Chiou , Chang-Ju Hsieh , Satish Bolloju
DOI: 10.1016/J.ELECTACTA.2017.09.065
关键词:
摘要: Abstract The iron precursor of lithium phosphate (LiFePO 4 ) is highly prone to oxidation Fe 3+ during the hydrothermal synthesis. impurities in LiFePO restrict conduction path Li + ions , which negatively affect cell performance. In this paper, we report that ferrocenecarboxylic acid possessing an extremely stable 2+ species and as carbon source has been used successfully suppress . X-ray diffraction results reveal 2 CO 3 first reacts with (NH HPO form PO at low temperatures, above 160 °C further give infrared spectroscopy, nuclear magnetic resonance, mass spectrometry, elemental analysis show sources calcination are derived from polymers through sequential [4 + 2] cycloaddition reactions cyclopentadiene 1,3-cyclopentadiene-1-carboxylic decomposition acid. electron paramagnetic resonance percentage synthesized 0.5 mol%. A plausible reaction mechanism for synthesis also proposed. as-synthesized shows orthorhombic olivine a discharge capacity 158 mAh g −1 rate 0.1C. excellent C-rate cycle-life performances.
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