Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993467 | Journal of Alloys and Compounds | 2018 | 29 Pages |
Abstract
A study of the morphology-controlled growth of olivine LiFePO4 particles by varying the precursor concentration via a facile solvothermal synthesis was carried out. The influences of the solvent product on the structure, morphology and electrochemical performance were systematically investigated by X-ray diffraction, scanning/transmission electron microscopy and charge-discharge tests. It was found that as the precursor concentration increased from 0.15â¯M to 0.90â¯M, the morphology of the LiFePO4 particles changed from spindle-shape to plate-type and then to a hierarchical club-shaped structure, and the predominantly exposed facet of all LiFePO4 samples was (100). The shape of LiFePO4 particles remained as nanoplates while synthesized at different reaction temperatures and time with a precursor concentration of 0.30â¯M. This in turn confirms that the precursor concentration plays an important role in controlling the morphology of LiFePO4 particles. To illustrate the phenomenon caused by variations in the concentration, a possible morphological transformation mechanism was demonstrated. With the optimal precursor concentration of 0.3â¯M, the obtained LiFePO4 shows square nanoplates with uniform particle size and carbon coating, resulting in excellent electrochemical performance: a discharge capacity of 157.3 mAh/g at 1â¯C with 95% capacity retention after 1000 cycles and a high-rate capacity of 140.8 mAh/g at 10â¯C. This facile and precursor concentration-controlled solvothermal method is anticipated to be a guide for large-scale cathode material manufacturing and can fulfil the requirements for its application to high-power lithium-ion batteries.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Xiaopeng Huang, Yaochun Yao, Feng Liang, Yongnian Dai,