An Improved Lithium-Sulfur Battery By Using Porous Carbon As the Sulfur Template

Abstract

As global demand for electric vehicles (EVs) continues to rise, the rechargeable battery of high-energy density is actively researched. Lithium-ion batteries (LIBs) have been widely used in the electric vehicles (EVs) and have been leading the EVs market. However, LIBs have reached their limits due to their practical low-capacity and high-cost. Therefore, novel strategy is required to solve the problem of the LIBs.Lithium-sulfur (Li-S) batteries attract attention because of high theoretical capacity (1675 mAh/g) and high energy density (2600 Wh/kg). Moreover, sulfur as electrode material is abundant and inexpensive. However, the sulfur-based batteries have serious disadvantages, which is the shuttle of intermediate polysulfides (Li2Sn, 2<n≤8), and low conductivity, result in poor cycle stability and low discharge capacity [1,2].Therefore, in this study, the sulfur electrode is fabricated by impregnating sulfur into three-dimensional porous carbon. The porous structure suppressed the dissolution/shuttle of sulfur species and improved the cycling stability and discharge capacity. Moreover, three types of porous carbon templated of activated carbon cloth, activated carbon felt, and porous carbon foam were compared on electrochemical performances.Reference Jimin Yun, 2023, High Loading Sulfur Cathode with Three-dimensional Porous Current Collector for Lithium-Sulfur Battery, Department of Materials Engineering and Convergence Technology, Gyeongsang National University, P.11, p.14Kimin Park, 2022, Design od metal phosphate based electrodes for high-performance Li-Ion & Li-S battery, Department of materials science and engineering seoul national university, P.1