High Energy Density Li-ion Battery by Ultra-thick Dry Coating Cathode

In the pursuit of a sustainable future, lithium-ion battery is an indispensable energy storage device in grid-scale energy storage systems. However, the prevalent cathode electrode manufacturing processes encounter obstacles in terms of their environmental harmfulness and costliness, primarily attributed to the toxic solvent desiccation and reclamation stages. Moreover, the reliance on lithium-ion batteries particularly underscores the necessity for augmenting energy density, both in terms of volume and weight, with the cathode as the pivotal factor. Dry electrode fabrication emerges as an economical approach to attain heightened material loadings. Herein, we utilize binder fibrillation method to prepare 5 kinds of thickness cathode, the research shows that the dry electrode exhibits a capacity retention of 51.7%, surpassing the 44.3% retention of the traditional wet-based electrode at a loading of roughly $30 mg \mathbf{c m}^{-2}\left(4 \mathrm{mAh} / \mathrm{cm}^{2}\right)$ and is also capable of performing at ultra-high loadings up to $100 \mathrm{mg} \mathrm{cm}{ }^{-2}$ ($20 \mathrm{mAh} / \mathrm{cm}^{2}$). This exceptional cycling endurance can be attributed to a robust, interconnected binder fiber by air mill and enhanced mechanical attributes.