Innovating Sulfur Based Electrode and Modified Lithium Electrode for Stable and Safer Lithium-Sulfur Batteries. Cycling, Impedance, Construction

摘要

The results of investigation the electrochemical characteristics of innovating sulfur based electrodes, and modified anodes based on lithium are presents. The sulfur electrode has been manufactured using the innovative method of saturating the carbon matrix with a solution of sulfur in an organic solvent. In the process of evacuation, the solvent evaporates, and sulfur crystallizes in the pores of the carbon matrix. The effect of storage of a sulfur electrode on its impedance characteristics also has been investigated. Two types of anodes based on lithium have been used: 1) metal lithium as is; 2) lithium with a surface modified by lithium-aluminum alloy with the goal to reducing the impedance of the negative electrode/electrolyte interface. In addition, a layer modified with a LiAl alloy has a protective role, preventing the reduction of lithium polysulfides in the electrolyte. Using the impedance method, we investigated the effect of cycling of negative electrodes with a modified and unmodified surface on the resistance of interface the Li electrode and the electrolyte.