Emerging energy chemistry in lithium-sulfur pouch cells

• 作者: Bo-Quan Li Qiang Zhang
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: HIGHLIGHTS
• 页码范围: 337-338
• 页数: 2页
• 语种: 英文

摘要

On pursuing high-energy-density energy storage systems beyond the current lithium-ion battery technique, lithiumsulfur (Li-S) batteries have attracted worldwide attention due to their ultrahigh theoretical energy density up to 500 Wh kg-1 [1].The unique Li-S chemistry based on the conversion reactions between solid sulfur, dissolved lithium polysulfides, and solid lithium sulfide affords thermodynamic advantages including high cathode specific capacity and low anode potential [2].However, polysulfide shuttling driven by concentration gradient renders severe kinetic challenges regarding rapid capacity degradation, low Coulombic efficiency (CE), and lithium anode corrosion.The above challenges are even more severe in working pouch cells where high-areal-loading cathodes, limited anode excess, and lean electrolyte are necessarily preset to deliver high energy density [3,4].New strategies to regulate the lithium polysulfides are essential for full demonstration of the high-energy-density advantage of Li-S batteries [5].