Crystal alignment of a LiFePO4 cathode material for lithium ion batteries using its magnetic properties |
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| Authors: | Cham Kim Yeokyung Yang Dongwoo Ha Dong Hwan Kim Hoyoung Kim |
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| Affiliation: | Daegu Gyeongbuk Institute of Science and Technology (DGIST), 333 Techno Jungang-daero, Daegu 42988 Republic of Korea, +82-53-785-3602 ; Korea Electrotechnology Research Institute (KERI), 12 Bulmosan-ro 10beon-gil, Changwon Gyeongsangnam-do 51543 Republic of Korea |
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| Abstract: | We suggest a way to control the crystal orientation of LiFePO4 using a magnetic field to obtain an advantageous structure for lithium ion conduction. We examined the magnetic properties of LiFePO4 such as magnetism and magnetic susceptibility, which are closely related to the crystal rotation in an external magnetic field, and considered how to use these properties for desired crystal orientation; thus, we successfully fabricated the crystal-aligned LiFePO4, in which the b-axis was highly aligned perpendicular to the surface of a current collector. Considering the low lithium ion conductivity of LiFePO4 inherently originated from its one-dimensional path for lithium ion diffusion, the crystal-aligned LiFePO4 potentially facilitates favorable transport kinetics for lithium ions during the charge/discharge process in lithium ion batteries. The crystal-aligned LiFePO4 should afford lower electrode polarization than pristine LiFePO4, and thus the former consistently exhibited higher reversible capacity than the latter.The crystal orientation of LiFePO4 was controlled by using a magnetic field to facilitate favorable transport kinetics for lithium ions. |
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