Porous supraparticles of LiFePO4 nanorods with carbon for high rate Li-ion batteries
Porous supraparticles, or spherical aggregate of LiFePO4 with carbon were prepared by spray-drying of LiFePO4 nanorods and glucose by heat treatment. Rod-like LiFePO4 nanoparticles are prepared by a solvothermal process, which was then sprayed with glucose as a carbon source forming spherical particles of LiFePO4 nanoparticles and glucose. Through the heat treatment under a nitrogen atmosphere, glucose was carbonized inside LiFePO4 supraparticles. Due to the interstices between nanoparticles, the spherical aggregates showed fairly high specific surface area (35.0104 m2g–1). Supraparticles-based electrode exhibited high initial capacity as well as remarkably high rate capability; discharging capacity was 146.15 mAhg–1 at high 10 C (1602.5 mA/g) and 126.58 mAhg–1 at 50 C (8012.5 mA/g). Moreover, cyclic performance at 5 C (801.25 mA/g) was relatively high as well (99% retention after 100 times test). Our porous carbonized LiFePO4 supraparticles have higher packing density or tap density (1.07 g/cm3) than carbonized LiFePO4 nanoparticle (0.78 g/cm3), which is considered an important factor in the practical application.
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Document Type: Research Article
Publication date: August 1, 2018
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