Journal
JOURNAL OF ELECTROCHEMICAL SCIENCE AND TECHNOLOGY
Volume 4, Issue 1, Pages 27-33Publisher
KOREAN ELECTROCHEMISTRY SOC
DOI: 10.5229/JECST.2013.4.1.27
Keywords
Electrode density; Electrode thickness; Electrode loading; Electrode porosity; Electrochemical performance; Lithium-ion batteries
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Funding
- Ministry of Knowledge Economy (MKE)
- Korea Institute for Advancement of Technology (KIAT) through the Inter-ER Cooperation Projects
- Ministry of Education, Science Technology (MEST)
- National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovation
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The consequences of electrode density and thickness for electrochemical performance of lithium-ion cells are investigated using 2032-type coin half cells. While the cathode composition is maintained by 90: 5: 5 (wt.%) with LiCoO2 active material, Super-P electric conductor and polyvinylidene fluoride polymeric binder, its density and thickness are independently controlled to 20, 35, 50 um and 1.5, 2.0, 2.5, 3.0, 3.5 g cm(-3), respectively, which are based on commercial lithium-ion battery cathode system. As the cathode thickness is increased in all densities, the rate capability and cycle life of lithium-ion cells become significantly worse. On the other hand, even though the cathode density shows similar behavior, its effect is not as high as the thickness in our experimental range. This trend is also investigated by cross-sectional morphology, porosity and electric conductivity of cathodes with different densities and thicknesses. This work suggests that the electrode density and thickness should be chosen properly and mentioned in detail in any kinds of research works.
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