Porous Ionic Network/CNT Composite Separator as a Polysulfide Snaring Shield for High Performance Lithium-Sulfur Battery.
Zhiwen FanJian TaoShuting PengYumin YangPierre StiernetJuntao TangYan WangChunyue PanShuai GuJiayin YuanKai HanGui-Peng YuPublished in: Macromolecular rapid communications (2023)
Lithium-sulfur (Li-S) battery features a high theoretical energy density, but the shuttle of soluble polysulfides between the two electrodes often results in a rapid capacity decay. Herein, we report a straightforward electrostatic adsorption strategy based on a crosslinked polyimidazolium separator as a snaring shield of polysulfides, which suppresses undesirable migration of polysulfides to the anode. The porous ionic network (PIN)-modified carbon nanotubes (CNTs) were successfully prepared and coated onto a commercial porous polypropylene membrane in a vacuum-filtration step. Favorable affinity of the imidazolium ring towards polysulfide via the polar interaction and the electrostatic effect of ions mitigates the undesirable shuttle of polysulfides in the electrolyte, improving the Li-S battery in terms of rate performance and cycling life. Compared to the reference PIN-free CNT-coated separator, the PIN/CNT-coated one has an increased initial capacity of 1.3 folds (up to 1394.8 mAh g -1 for PIN/CNT/PP-3) at 0.1 C. This article is protected by copyright. All rights reserved.
Keyphrases
- solid state
- carbon nanotubes
- ionic liquid
- ion batteries
- metal organic framework
- molecular dynamics simulations
- highly efficient
- aqueous solution
- high intensity
- reduced graphene oxide
- radiation therapy
- mass spectrometry
- hyaluronic acid
- capillary electrophoresis
- loop mediated isothermal amplification
- sensitive detection