Electrochemical Performance of Dry Processed Graphite Electrode with PTFE Binder for Lithium-Ion Batteries

Abstract

Both cathode and anode in Lithium-ion batteries (LIBs) are being manufactured by slurry coating process; however, currently used wet coating process has some drawbacks, including the difficulty in further increasing the electrode thickness as well as high fabrication cost mainly due to the use of facility for drying process. To address these issues, dry electrode fabrication process has been proposed and actively investigated as an alternative electrode manufacturing process. Dry electrode fabrication process with PTFE binder offers several advantages over conventionally used slurry coating process such as high manufacturing efficiency due to the non-solvent process and the ease of increasing the electrode thickness resulting from fibrillization of the PTFE binder. However, the instability of PTFE binder in dry processed graphite anodes remains a challenge, as the irreversible reaction of PTFE binder leads to the deterioration of the electrode. Furthermore, the properties of graphite materials including specific surface area, the particle size and shape can also affect the microstructure of the electrode and the electrochemical performance of graphite anode. In this work, the relationship between the properties of graphite and the electrochemical performance of dry processed graphite anode was investigated using various analytical techniques and the electrochemical characterization techniques. More detailed analyses results will be discussed in the presentation.