Water-Soluble Trifunctional Binder for Sulfur Cathodes for Lithium–Sulfur Battery

Abstract

Conventional polymer binder in a lithium−sulfur (Li−S) battery, poly(vinylidene fluoride) (PVDF), suffers from insufficient ion conductivity, poor polysulfide-trapping ability, weak mechanical property, and requirement of organic solvents, which significantly encumber the industrial application of Li−S battery. Herein, a water-soluble binder with trifunctions, covalently cross-linked quaternary ammonium cationic starch (c-QACS), is developed to confront these issues. Similar to the poly(ethylene oxide) solid electrolytes, the c-QACS binder remarkably improves Li + ion transfer capacity. The abundant O actives endow the c-QACS binder with admirable lithium polysulfide-trapping capability to retard the shuttle effect. In addition, the formed 3D network effectively maintains the electrode integrity during cycling. Benefiting from the above merits, the sulfur cathode with the c-QACS binder demonstrates a performance improvement of 300 and 150% compared with sulfur cathode with PVDF and bulk QACS binder after 100 cycles at 0.2C.

Cross-Linked γ-Polyglutamic Acid as an Aqueous SiOx Anode Binder for Long-Term Lithium-Ion Batteries

“…Li + conductivity is also the essential factor that the binders should have. 33,34 The SiO x anode material is intrinsically Li +insulating. The employment of binders with high Li + conduction is vital to the transport of Li + through the surface of the SiO x active materials.…”

“…The robust mechanical strength and high elastic functions of the binders keep the particles in contact and alleviate the volume change of SiO x in the cycled process. Li + conductivity is also the essential factor that the binders should have. , The SiO x anode material is intrinsically Li + -insulating. The employment of binders with high Li + conduction is vital to the transport of Li + through the surface of the SiO x active materials.…”

Superior polysulfide adsorption ability by using Ti3C2 nanosheets as effective reservoirs for high electrochemical performance

“…Much effort has been devoted to the study of lithium-sulfur batteries because of their high energy density, long cycle life, and low cost; this technology could be applied in many areas, such as electric vehicles and other electric applications. [1][2][3][4][5] However, the low utilization of their active materials greatly inhibits the commercial application of lithium-sulfur batteries. This is due to their poor electronic conductivity, their polysulfide dissolution, and the shuttle effect that takes place during the electrochemical cycles.…”

Aqueous Supramolecular Binder for a Lithium–Sulfur Battery with Flame-Retardant Property

“…It is cheap and electrochemically stable, making it a promising binder candidate. , These rich polar groups can provide strong adhesion with current collector, facilitate the diffusion of Li + ions, and adsorb lithium polysulfides to restrain the shuttle effect. They also favor construction of a cross-linking structure. , The development of a SP-based binder for the sulfur cathode is expected to solve the problems simultaneously. In addition, safe operation of a Li–S battery is a critical criterion for practical application .…”

“…They also favor construction of a cross-linking structure. 46,47 The development of a SP-based binder for the sulfur cathode is expected to solve the problems simultaneously. In addition, safe operation of a Li−S battery is a critical criterion for practical application.…”