Co-precipitation synthesis of micro-sized spherical LiMn(0.5)Fe(0.5)PO(4) cathode material for lithium batteries

Title
Co-precipitation synthesis of micro-sized spherical LiMn(0.5)Fe(0.5)PO(4) cathode material for lithium batteries
Author
선양국
Issue Date
2011-12
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, 2011, 21(48), p19368-p19374, 7p.
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 viaco-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 °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.
URI
http://pubs.rsc.org/en/content/articlelanding/2011/jm/c1jm13889h/unauth#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/72975
ISSN
0959-9428; 1364-5501
DOI
10.1039/C1JM13889H
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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