Co-precipitation synthesis of micro-sized spherical LiMn0.5Fe0.5PO4 cathode material for lithium batteries
- Authors
- Oh, Seung-Min; Myung, Seung-Taek; Choi, Yong Seok; Oh, Kyu Hwan; Sun, Yang Kook
- Issue Date
- Nov-2011
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY, v.21, no.48, pp.19368 - 19374
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY
- Volume
- 21
- Number
- 48
- Start Page
- 19368
- End Page
- 19374
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/27666
- DOI
- 10.1039/c1jm13889h
- ISSN
- 0959-9428
- Abstract
- It is important to increase the energy density of olivine-type cathode materials utilizing micro-sized particles for rechargeable lithium batteries. However, according to the literature, micro-sized LiMn1-xFexPO4 compounds have limited specific capacity because they exhibit lower electrical conductivity than nano-sized materials: isolation of the inner part of the particles from the electrolyte results in an electrochemically inactive area during cycling, which hinders proper Li+ transport that causes the failure of the micron-sized particles. To improve the electrical conductivity of micro-sized LiMn1-xFexPO4, we designated micro-sized C-LiMn0.5Fe0.5PO4 materials composed of nanopores in the micro-sized particles synthesized via co-precipitation. The resulting morphology was spherical, showing a tap density of 1.27 g cm(-3), and uniform carbon coating layers on the primary particles with nanopores were observed in the secondary particles. The as-synthesized micro-sized C-LiMn0.5Fe0.5PO4 exhibited outstanding cyclability at a C-rate of 0.5, retaining 97% of its capacity at room temperature and 85% at 55 degrees C, due to the synergetic effect of the presence of a uniform carbon coating layer on the primary particles with nanopores in the secondary particles.
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