Desolvation Synergy of Multiple H/Li‐Bonds on an Iron‐Dextran‐Based Catalyst Stimulates Lithium–Sulfur Cascade Catalysis. Issue 51 (17th November 2022)

• Record Type: Journal Article
• Authors: Li, Tingting; Cai, Dong; Yang, Shuo; Dong, Yangyang; Yu, Shuang; Liang, Ce; Zhou, Xuemei; Ge, Yongjie; Xiao, Kuikui; Nie, Huagui; Yang, Zhi
• Is Part Of: Advanced materials. Volume 34:Issue 51(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-17
• Subjects: cascade catalysis -- H/Li‐bonds -- iron dextran -- lithium polysulfide conversion -- lithium–sulfur batteries; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202207074
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Traditional lithium–sulfur battery catalysts are still facing substantial challenges in solving sulfur redox reactions, which involve multistep electron transfer and multiphase transformations. Here, inspired by the combination of iron dextran (INFeD) and ascorbic acid (VC) as a blood tonic for the treatment of anemia, a highly efficient VC@INFeD catalyst is developed in the sulfur cathode, accomplishing the desolvation and enrichment of high‐concentration solvated lithium polysulfides at the cathode/electrolyte interface with the assistance of multiple H/Li‐bonds and resolving subsequent sulfur transformations through gradient catalysis sites where the INFeD promotes long‐chain lithium polysulfide conversions and VC accelerates short‐chain lithium polysulfide conversions. Comprehensive characterizations reveal that the VC@INFeD can substantially reduce the energy barrier of each sulfur redox step, inhibit shuttle effects, and endow the lithium–sulfur battery with high sulfur utilization and superior cycling stability even under a high sulfur loading (5.2 mg cm −2 ) and lean electrolyte (electrolyte/sulfur ratio, ≈7 µL mg −1 ) condition. Abstract : A highly efficient VC@INFeD catalyst is developed for lithium–sulfur batteries, accomplishing fast de‐solvation and enrichment of high‐concentration lithium polysulfides (LiPSs) by multiple H/Li‐bonds and resolving subsequent sulfur transformations through cascade catalytic sites where INFeD and VC promote the conversions of long‐chain and short‐chain LiPSs, respectively, which substantially reduce energy barriers and eliminate LiPS shuttling effects.