Transportation properties in nanosized LiFePO4 positive electrodes and their effects on the cell performance

Title
Transportation properties in nanosized LiFePO4 positive electrodes and their effects on the cell performance
Authors
류승호김수김태영남진현조원일
Keywords
Lithium-ion battery; LiFePO4; Electrode density; Electrode thickness; Tortuosity; Effective diffusivity
Issue Date
2013-03
Publisher
Journal of applied electrochemistry
Citation
VOL 43, NO 3, 253-262
Abstract
To achieve a high energy density for Li-ion batteries, it is important to optimize the electrode thickness and electrode density. It is common to design the electrodes to be thick and dense to achieve a high energy density. However, highly tortuous transport paths in thick and dense electrodes can lead to severe transport losses,which negatively affect the cell performance. In this work, we investigated the effects of varying the electrode thickness and density on lithium ion transport in the electrolytes by means of both experiments and simulations. Both results indicated that an additional capacity loss occurs from the electrode with low porosity because the effective diffusivity decreased in the electrolyte phase. Optimal ranges of the electrode thickness and density (porosity) that can be used to help design high-power LiFePO4/graphite batteries were also suggested in this work.
URI
http://pubs.kist.re.kr/handle/201004/44512
ISSN
0021891X
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KIST Publication > Article
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