title: Ferrocene-Promoted Long-Cycle Lithium-Sulfur Batteries.
abstract: Confining lithium polysulfide intermediates is one of the most effective ways to alleviate the capacity fade of sulfur-cathode materials in lithium-sulfur (Li-S) batteries. To develop long-cycle Li-S batteries, there is an urgent need for material structures with effective polysulfide binding capability and well-defined surface sites; thereby improving cycling stability and allowing study of molecular-level interactions. This challenge was addressed by introducing an organometallic molecular compound, ferrocene, as a new polysulfide-confining agent. With ferrocene molecules covalently anchored on graphene oxide, sulfur electrode materials with capacity decay as low as 0.014 % per cycle were realized, among the best of cycling stabilities reported to date. With combined spectroscopic studies and theoretical calculations, it was determined that effective polysulfide binding originates from favorable cation-π interactions between Li+of lithium polysulfides and the negatively charged cyclopentadienyl ligands of ferrocene.
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.|College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors: Yingying
authors: Y
authors: Mi
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Wen
authors: W
authors: Liu
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Ke R
authors: KR
authors: Yang
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Jianbing
authors: J
authors: Jiang
authors: School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, China.
authors: Qi
authors: Q
authors: Fan
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Zhe
authors: Z
authors: Weng
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Yiren
authors: Y
authors: Zhong
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Zishan
authors: Z
authors: Wu
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Gary W
authors: GW
authors: Brudvig
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Victor S
authors: VS
authors: Batista
authors: College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors: Henghui
authors: H
authors: Zhou
authors: Department of Chemistry and Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT, 06516, USA.
authors: Hailiang
authors: H
authors: Wang
keywords: ferrocene; graphene oxide; lithium polysulfides; lithium-sulfur batteries; long-cycle batteries