Towards full demonstration of high areal loading sulfur cathode in lithium–sulfur batteries  

作　　者：Long Kong Qi Jin Xi-Tian Zhang Bo-Quan Li Jin-Xiu Chen Wan-Cheng Zhu Jia-Qi Huang Qiang Zhang 

机构地区：[1]Beijing Key Laboratory o f Green Chemical Reaction Engineering and Technology Department of Chemical Engineering,Tsinghua University,Beijing 100084,China [2]Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,Heilongjiang,China [3]Department of Chemical Engineering,Qufu Normal University,Qufu 273165,Shandong,China [4]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Energy Chemistry》2019年第12期17-22,共6页能源化学（英文版）

基　　金：supported by the National Key Research and Development Program(2016YFA0202500 and 2016YFA0200102);the National Natural Science Foundation of China(21776019,21805162,51772069,and U1801257);China Postdoctoral Science Foundation(2018M630165);Beijing Key Research and Development Plan(Z181100004518001)

摘　　要：Lithium–sulfur(Li–S)batteries have been recognized as promising substitutes for current energy-storage technologies owing to their exceptional advantages in very high-energy density and excellent material sustainability.The cathode with high sulfur areal loading is vital for the practical applications of Li–S batteries with very high energy density.However,the high sulfur loading in an electrode results in poor rate and cycling performances of batteries in most cases.Herein,we used diameters of 5.0(D5)and 13.0(D13)mm to probe the effect of electrodes with different sizes on the rate and cycling performances under a high sulfur loading(4.5 mg cm^-2).The cell with D5 sulfur cathode exhibits better rate and cycling performances comparing with a large(D13)cathode.Both the high concentration of lithium polysulfides and corrosion of lithium metal anode impede rapid kinetics of sulfur redox reactions,which results in inferior battery performance of the Li–S cell with large diameter cathode.This work highlights the importance of rational matching of the large sulfur cathode with a high areal sulfur loading,carbon modified separators,organic electrolyte,and Li metal anode in a pouch cell,wherein the sulfur redox kinetics and lithium metal protection should be carefully considered under the flooded lithium polysulfide conditions in a working Li–S battery.Lithium–sulfur（Li–S） batteries have been recognized as promising substitutes for current energy-storage technologies owing to their exceptional advantages in very high-energy density and excellent material sustainability. The cathode with high sulfur areal loading is vital for the practical applications of Li–S batteries with very high energy density. However, the high sulfur loading in an electrode results in poor rate and cycling performances of batteries in most cases. Herein, we used diameters of 5.0（D5） and 13.0（D13） mm to probe the effect of electrodes with different sizes on the rate and cycling performances under a high sulfur loading(4.5 mg cm-2). The cell with D5 sulfur cathode exhibits better rate and cycling performances comparing with a large（D13） cathode. Both the high concentration of lithium polysulfides and corrosion of lithium metal anode impede rapid kinetics of sulfur redox reactions, which results in inferior battery performance of the Li–S cell with large diameter cathode. This work highlights the importance of rational matching of the large sulfur cathode with a high areal sulfur loading, carbon modified separators, organic electrolyte, and Li metal anode in a pouch cell, wherein the sulfur redox kinetics and lithium metal protection should be carefully considered under the flooded lithium polysulfide conditions in a working Li–S battery.

关 键 词：Lithium sulfur batteries High areal sulfur loading Lithium anode protection Sulfur redox reactions Polysulfide interm ediates 

分 类 号：TM9[电气工程—电力电子与电力传动]