Processing and Manufacturing of Electrodes for Lithium-Ion Batteries by Li Jianlin;Jin Congrui;

Author:Li, Jianlin;Jin, Congrui;
Language: eng
Format: epub
Publisher: Institution of Engineering & Technology
Published: 2023-07-29T00:00:00+00:00

Figure 8.4 (a) SEM/EDX of three layers of a graphite anode with PVDF binder, with the bottom layer referring to the layer at the interface between the current collector and the electrode. (b) The influence of drying temperature and mass loading on adhesion strength for graphite anodes. Reprinted with permission from Elsevier [19].

Empirical studies that study the drying process in situ tend to be qualitative while those that can study dried electrodes post-drying tend to be quantitative [7]; developing quantitative approaches that can be employed in situ would complement the findings found thus far. Early drying simulations were able to provide insights and complement experimental findings, though sometimes had to rely upon simplifying assumptions about material properties or the diffusion of solvent and binder phases [7]. More recent drying simulations have produced three-dimensional electrode mesostructures [25].

In addition to temperature, it is worth mentioning that the drying environment can influence drying speed and effectiveness. Drying in humid air can inhibit coating cracking [15], likely due to less stress being imparted to the coating. Conversely, a given volume of humid air dries less solvent than an equivalent volume of dry air from a coating due to the air already being partially saturated with water which leads to slower drying. Inert gas drying could speed up drying, as heavier gases (such as argon) could supplant the solvent during drying [4]. Such vacuum drying is used in secondary drying to reduce the moisture content of electrodes to a safe level for cell assembly, as will be discussed in Section 8.4.

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