Tailoring Crystal Structure and Morphology of LiFePO4/C Cathode Materials Synthesized by Heterogeneous Growth on Nanostructured LiFePO4 Seed Crystals
- Authors
- Han, DW (Han, Dong-Wook); Ryu, WH (Ryu, Won-Hee); Kim, WK (Kim, Won-Keun); Lim, SJ (Lim, Sung-Jin); Kim, YI (Kim, Yong-Il); Eom, JY (Eom, Ji-Yong); Kwon, HS (Kwon, Hyuk-Sang)
- Issue Date
- Feb-2013
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS APPLIED MATERIALS INTERFACES, v.5, no.4, pp 1342 - 1347
- Pages
- 6
- Journal Title
- ACS APPLIED MATERIALS INTERFACES
- Volume
- 5
- Number
- 4
- Start Page
- 1342
- End Page
- 1347
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147498
- DOI
- 10.1021/am302560m
- ISSN
- 1944-8244
1944-8252
- Abstract
- Porous and coarse (5-10 mu m) LiFePO4/C composites with excellent electrochemical performance were synthesized by a growth technology using nanostructured (100-200 nm) LiFePO4 as seed crystals for the 2nd crystallization process. The porous and coarse LiFePO4/C presented a high initial discharge capacity (similar to 155 mA h g(-1) at 0.1 C), superior rate-capability (similar to 100 mA h g(-1) at 5 C, similar to 65 % of the discharge capacity at 0.1 C), and excellent cycling performance (similar to 131 mA h g(-1), similar to 98 % of its initial discharge capacity after 100 cycles at 1 C). The improvement in the rate-capability of the LiFePO4/C was attributed to the high reaction area resulted from the pore tunnels formed inside LiFePO4 particles and short Li-ion diffusion length. The improved cycling performance of the LiFePO4/C resulted from the enhanced structural stability against Li-deficient LiFePO4 phase formation after cycling by the expansion of the ID Li-ion diffusion channel in the LiFePO4 crystal structure.
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