Greatly Improved Conductivity of Double-Chain Polymer Network Binder for High Sulfur Loading Lithium–Sulfur Batteries with a Low Electrolyte/Sulfur Ratio

Journal Article (Journal Article)

Binders have been considered to play a key role in realizing high-energy-density lithium–sulfur batteries. However, the accompanying problems of limited conductivity and inferior affinity of soluble polysulfide intermediates bring down their comprehensive performance for practical applications. Herein, the synthesis of a novel double-chain polymer network (DCP) binder by polymerizing 4,4′-biphenyldisulfonic acid connected pyrrole monomer onto viscous sodium carboxymethyl cellulose matrix, yielding a primary crystal structure is reported. Consequently, the resulted binder enables superior rate performance from 0.2 C (1326.9 mAh g ) to 4 C (701.4 mAh g ). Moreover, a high sulfur loading of 9.8 mg cm and a low electrolyte/sulfur ratio (5:1, µL mg ) are achieved, exhibiting a high area capacity of 9.2 mAh cm . In situ X-ray diffraction analysis is conducted to monitor the structural modifications of the cathode, confirming the occurrence of sulfur reduction/recrystallization during charge–discharge process. In addition, in situ UV–vis measurements demonstrate that DCP binder impedes the polysulfide migration, thereby giving rise to high capacity retention for 400 cycles. −1 −1 −2 −1 −2

Full Text

Duke Authors

Cited Authors

  • Liu, X; Qian, T; Liu, J; Tian, J; Zhang, L; Yan, C

Published Date

  • August 16, 2018

Published In

Volume / Issue

  • 14 / 33

Electronic International Standard Serial Number (EISSN)

  • 1613-6829

International Standard Serial Number (ISSN)

  • 1613-6810

Digital Object Identifier (DOI)

  • 10.1002/smll.201801536

Citation Source

  • Scopus