Effect of spray drying technological conditions on the performance of LiFePO4/C cathode materials with high energy density
Lithium iron phosphate/carbon (LiFePO4/C) composites with high energy density were synthesized by wet ball milling, spray drying, and carbothermal reduction method. The effect of spray drying technological conditions on the performance of LiFePO4/C composites was systematically investigated. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge tests, etc. The results show that all as-prepared LiFePO4/C composites have a well-ordered olivine structure and spherical morphology. Compared with centrifugal spray drying technology, LiFePO4/C prepared by pressure spray has a smaller particle size and exhibits more uniform particle size distribution as well as better electrochemical performance. However, as the particle size of LiFePO4/C microspheres is decreased, the sphericity of particles becomes worse and tap density of materials steps down, resulting in poor processability in 14500 cylindrical battery.
KeywordsLiFePO4/C Spray drying Particle size Electrochemical performance Processability
The authors are grateful to the Natural Science Foundation of Hebei Province (Grant number E2015202356) for the financial support to this work.
- 13.Chiu KF, Chen CL (2010) Electrochemical performance of magnetron sputter deposited LiFePO4-Ag composite thin film cathodes. Surf Coat Technol 205:642–1646Google Scholar
- 25.Chen L, Chen Z, Liu S, Gao B, Wang J (2018) Effects of particle size distribution on compacted density of lithium iron phosphate 18650 battery. J Electrochem Energy Conversion Storage 15:041011-1-041011-5Google Scholar