期刊
SOLID STATE IONICS
卷 338, 期 -, 页码 96-102出版社
ELSEVIER
DOI: 10.1016/j.ssi.2019.05.002
关键词
Lithium-iron phosphate; Magnetic orientation; B axis; Rate capability; Magnetic susceptibility
资金
- Innovation Program of Shanghai Municipal Education Commission [15ZZ095]
- Science and Technology Commission of Shanghai Municipality [14520503100]
Lithium-iron phosphate (LiFePO4) monocrystalline platelets (LFP-P) with ac facet-preferred growing were obtained by a solvothermal method. Based on its anisotropy, a LiFePO4 cathode (LFP-PM) with the b axis-oriented aligning was prepared by magnetic orientation. The structure, morphology and magnetic performance of the LFP-P were studied by X-ray diffractometry, scanning-electron microscopy, transmission-electron microscopy and superconducting quantum-interference device technologies. The LFP-P exhibited paramagnetic behavior and its b axis had the largest magnetic susceptibility, which made the LFP-P stack parallel to the magnetic field. It resulted in a higher lithium-ion diffusion coefficient of the LFP-PM (1.6855 x 10(-11) cm(2)s(-1)) compared with that of the LiFePO4 cathode (LFP-PU) prepared without magnetic orientation (1.2538 x 10(-11) cm(2) s(-1)). The faster lithium-ion diffusion was contributed to a higher reversibility at 0.1 mV s(-1) and higher discharge capacities of the LFP-PM at high rates >= 2 C. For the first time, LiFePO4 monocrystalline platelets were made to align along b axis through magnetic orientation. It was proved to be an effective means of enhancing high rate performance.
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