Nafion coated sulfur–carbon electrode for high performance lithium–sulfur batteries

A functional carbon layer-coated separator for high performance lithium sulfur batteries

“…Another promising approach is the modification of cell configuration, which means building a physical barrier to prevent the migration of polysulfides. The cell modification can be concluded into three aspects, that is, surface coating of the sulfur cathode [14,15], insertion of free-standing interlayer (carbon interlayer [16][17][18], polypyrrole interlayer [19]), and modification of separator. The first two methods of cell modification have been proven to be effective to enhance the performance of lithium-sulfur batteries, while the study on the separation modification of lithium-sulfur batteries is still at a very early stage.…”

Perfluorinated Ionomer‐Enveloped Sulfur Cathodes for Lithium–Sulfur Batteries

“…Suppressing PS shuttle with Nafion was first attempted by Y. Cao et al; [9] using a Nafion-coated graphene/ sulfur nanocomposite they discovered that the Nafion layer effectively reduced the migration of dissolved PS from the composite. Later, H. Schneider et al [10] incorporated Nafion into a sulfur cathode as a binder and, very recently, Q. Tang et al [11] cast a Nafion solution onto a sulfur cathode with a sulfur loading of 0.55 mg cm…”

Two-dimensional Nafion nanoweb anion-shield for improved electrochemical performances of lithium–sulfur batteries

“…[5][6][7][8][9] Nafion polymer, as one of promising interlayer materials, has shown a great effect in preventing the diffusion of polysulfides from the cathode electrode. [10][11][12][13] This is attributed to the presence of SO 3 groups, which efficiently bounce the negatively-charged polysulfide anions (S n 2-) by electrostatic repulsion. Many studies have attempted to exploit this electrostatic property by a) forming a Nafion layer on the sulfur cathode 12 or b) modifying the pristine separator with Nafion polymer 10,11 .…”

“…However, the dense Nafion polymer layer that is formed above the electrode or separator impedes the efficient permeation of Li-ions toward the sulfur cathode, thereby deteriorating the rate capability of the sulfur cathode. [10][11][12] Herein, we first demonstrate a facile and effective strategy to directly deposit a Nafion nanoweb onto a sulfur cathode (a Nafion nanoweb-sulfur cathode) in order to efficiently suppress the polysulfide shuttling effect and enable fast Li-ion exchange with the sulfur cathode through the Nafion selective protection layer. The nanoweb structure is reported to have a great advantage in terms of its electrolyte wettability, which forms good ion migration channels and thus facilitates an efficient reaction between the active material and the electrolyte.…”