Open AccessThe dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries
Author(s) -
Gaoran Li,
Can Wang,
Wenlong Cai,
Zhan Lin,
Zhou Peng Li,
Shanqing Zhang
Publication year - 2016
Publication title -
npg asia materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.082
H-Index - 75
eISSN - 1884-4057
pISSN - 1884-4049
DOI - 10.1038/am.2016.138
Subject(s) - polysulfide , separator (oil production) , materials science , dissolution , anode , sulfur , energy storage , polymer , cathode , lithium–sulfur battery , chemical engineering , battery (electricity) , thermal stability , nanotechnology , electrode , composite material , chemistry , electrochemistry , electrolyte , metallurgy , engineering , power (physics) , physics , quantum mechanics , thermodynamics
The development of lithium–sulfur (Li–S) batteries is of practical significance to meet the rapidly escalating demand for advanced energy storage technologies with long life and high-energy density. However, the dissolution and shuttling of the intermediate polysulfides (PS) initiates the loss of active sulfur and the poisoning of the lithium anode, leading to unsatisfactory cyclability and consequently hinders the commercialization of Li–S batteries. Herein, we develop a facile strategy to tame the PS dissolution and the shuttling effect in the Li–S system by introducing a modified polybenzimidazole (mPBI) with multiple functions. As a binder, the excellent mechanical property of mPBI endows the sulfur electrode with strong integrity and, therefore, results in high sulfur loading (7.2 mg cm−2), whereas the abundant chemical interaction between mPBI and PS affords efficient PS adsorption to inhibit sulfur loss and prolong battery life. As a functional agent for the separator, the mPBI builds a PS shield onto the separator to block PS’s migration to further suppress the PS shuttling. The dual actions of mPBI confer an excellent performance of 750 mAh g−1 (or 5.2 mAh cm−2) after 500 cycles at C/5 on the Li–S battery with an ultralow capacity fading rate of 0.08% per cycle.Full Tex