Premium
Ferrocene‐Promoted Long‐Cycle Lithium–Sulfur Batteries
Author(s) -
Mi Yingying,
Liu Wen,
Yang Ke R.,
Jiang Jianbing,
Fan Qi,
Weng Zhe,
Zhong Yiren,
Wu Zishan,
Brudvig Gary W.,
Batista Victor S.,
Zhou Henghui,
Wang Hailiang
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201609147
Subject(s) - polysulfide , ferrocene , sulfur , lithium (medication) , chemistry , graphene , inorganic chemistry , cyclopentadienyl complex , electrochemistry , oxide , covalent bond , combinatorial chemistry , nanotechnology , electrode , materials science , organic chemistry , catalysis , electrolyte , medicine , endocrinology
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.