Solvent-Free Thick Electrodes for Enhanced Lithium-Ion Batteries
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To increase the energy density per weight of lithium-ion batteries, a promising approach is to create thick electrodes, which involves increasing the active material's thickness. However, this method comes with its challenges, such as the possibility of cracks forming during the drying process and the difficulty in achieving performance comparable to traditional electrodes due to increased charge transport distance and resistance. To address these issues, selecting the right binder can offer a viable solution for manufacturing the thick film electrode. It's essential to understand the distinctive chemical properties of various polymer binders to ensure a strong adhesive force while using minimal binder material. In our study, we produced a dry electrode with a thickness of 200 μm or more, employing a microbial aliphatic polyester binder with a dry process. Impressively, this led to a capacity of 186 mAh/g, which is comparable to that of conventional wet electrodes.