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http://dx.doi.org/10.5229/JKES.2021.24.2.28

Thick Positive Electrode using Polytetrafluorethylene (PTFE) Binder for High-Energy-Density Lithium-ion Batteries  

Kang, Jeong Min (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University)
Kim, Hyoung Woo (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University)
Jang, Young Seok (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University)
Kim, Haebeen (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
Ryu, Ji Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
Publication Information
Journal of the Korean Electrochemical Society / v.24, no.2, 2021 , pp. 28-33 More about this Journal
Abstract
Many researchers have increased the loading level of electrodes to improve the energy density of secondary batteries. In this study, high-loading NCM523 (LiNi0.5Co0.2Mn0.3O2) positive electrode is manufactured using a polytetrafluoroethylene (PTFE) binder, not the conventional polyvinylidene fluoride (PVdF) binder, which has been commonly used in lithium-ion batteries. Through the kneading process using PTFE suspension, not the conventional slurry process using PVdF solution in N-methyl-2-pyrrolidinone (NMP), thick electrodes with high loading are easily manufactured. When the PTFE and PVdF-based electrodes are prepared at a loading level of 5.0 mAh/cm2, respectively, the PTFE-based electrode shows better cycle performance and rate capability than those of PVdF-based electrodes. The electrode manufactured by the kneading process using a PTFE binder has high electrode porosity due to insufficient roll-press, but the porosity can be lowered by high temperature roll-press over 120℃. However, there is no significant difference in cycle performance according to the roll press temperature. In addition, the cycle performance of the high loading electrode is slightly improved by increasing the content of the conductive material. Overall, the PTFE binder can improve the performance of the high loading electrode, but additional solutions will be needed.
Keywords
High Loading; PTFE Binder; Thick Electrode; Lithium-Ion Batteries;
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