Design and Preparation of Thick Electrodes for Lithium-Ion Batteries

Abstract

In order to improve the energy density of lithium-ion batteries, it is a feasible way to design thick electrodes. The thick electrode design can reduce the use of non-active substances such as current collectors and separators in the battery by increasing the load of the electrode plates, thereby improving the energy density of the lithium-ion battery and improving economy due to the reduction of material costs. In this study, self-supporting electrode films with good mechanical performance based on the dry film technology of binder fibrillation are prepared, and it is verified that their electrochemical performance is superior to that of electrodes prepared by some other processes; The mechanism of the effect of thickness on electrode performance is explored, and the adverse effects of increased thickness are improved through the use of layered structural design such as imbedding ion layers and designing gradient porosity. Thick electrodes ranging from 50 to 1000 μm are prepared in this study and the performance of thick electrodes is improved through layered structural design.

Keywords: Lithium-ion batteries, Thick electrodes, Dry film technology, Layered structural design