High‐Performance Magnesium‐Sulfur Batteries Based on a Sulfurated Poly(acrylonitrile) Cathode, a Borohydride Electrolyte, and a High‐Surface Area Magnesium Anode. Issue 11 (22nd July 2020)

• Record Type: Journal Article
• Authors: Wang, Peiwen; Trück, Janina; Niesen, Stefan; Kappler, Julian; Küster, Kathrin; Starke, Ulrich; Ziegler, Felix; Hintennach, Andreas; Buchmeiser, Michael R.
• Is Part Of: Batteries & supercaps. Volume 3:Issue 11(2020)
• Page Start: 1239
• Page End: 1247
• Publication Date: 2020-07-22
• Subjects: magnesium -- sulfur -- sulfurized polyacrylonitrile -- SPAN -- borohydride -- batteries; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202000097
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Post‐lithium‐ion battery technology is considered a key element of future energy storage and management. Apart from high gravimetric and volumetric energy densities, economic, ecologic and safety issues become increasingly important. In that regards, both the anode and cathode materials must be easily available, recyclable, non‐toxic and safe, which renders magnesium‐sulfur (Mg−S) batteries a promising choice. Herein, we present Mg−S cells based on a sulfurated poly(acrylonitrile) composite cathode (SPAN), together with a halogen‐free electrolyte containing both Mg[BH4 ]2 and Li[BH4 ] in diglyme and a high‐specific surface area magnesium anode based on Rieke magnesium powder. These cells deliver discharge capacities of 1400 and 800 mAh/gsulfur with >99 % Coulombic efficiency at 0.1 C and 0.5 C, respectively, and are stable over at least 300 cycles. Energy densities are 470 and 400 Wh/kgsulfur at 0.1 C and 0.5 C, respectively. Rate tests carried out between 0.1 C and 2 C demonstrate good rate capability of the cells. Detailed mechanistic studies based on X‐ray photoelectron spectroscopy and electric impedance spectroscopy are presented. Abstract : Post‐lithium‐ion batteries : A novel Mg−S cell based on a sulfurated poly(acrylonitrile) composite cathode (SPAN), a hybrid Li + /Mg 2+ electrolyte, and a Rieke Mg powder anode is presented. The batteries deliver stable discharge capacities of 1400 and 800 mAh/gsulfur with >99 % Coulombic efficiency at 0.1 C and 0.5 C, respectively. The system also shows superior rate capability. In depth cyclic voltammetry, X‐ray photoelectron spectroscopy, and electrochemical impedance spectroscopy studies are presented.