A polymer sulfur-based electrode for high energy Li batteries. Influence of the materials of current collector and electrode design on the performance of lithium-sulfur batteries

Abstract

Various compositions and types of materials based on the sulfur are used for the cathode of Li–S batteries with the aim to improve the performance of this system. In the present study, we investigated Li batteries with cathode based on polymer sulfur. Our development and evaluation confirm that the performance of Li–S batteries is also heavily dependent on the electrode technology, some extraneous materials like current collector, and the design of electrodes. The modification of the aluminum current collector of the sulfur electrode dramatically decreases the interface resistance of interface between sulfur cathode and current collector. Total impedance of Li-S batteries decreases, and the operating power increases. The modification of the design of electrodes results in increasing the energy of Li-S battery and stabilizing the battery parameters during cycling. In our article, these effects are confirmed by the results of Li-S battery testing with the polymer sulfur-based cathode: impedance spectroscopy, cyclic voltammetry, and galvanostatic cycling.