A separator coated with commercial LiFePO₄ and conductive carbon for Li–S battery with good cycling performance

Abstract

A prepared multifunctional separator for Li–S batteries shows no corrosions and lithium dendrites in after-cycling anodes, greatly suppressed ‘shuttle effect’, high utilization of active sulfur, and reduced charge transfer resistance, and high-performance Li–S batteries are achieved.

Sustainable release of Mg(NO3)2 from a separator boosts the electrochemical performance of lithium metal as an anode for secondary batteries

“…S8, ESI†) due to the increased redox kinetics. 15,39 The difference in anodic peaks (CV curves) of the Li//S cells further indicates that Super P can promote the reaction kinetics of S cathodes. The Li + diffusion coefficient of SP@MND calculated from the CV (Fig.…”

“…The R CT value of the battery with SP@MND is lower than that of the battery with MND, because of the high electronic conductivity of Super P, which can promote the reaction kinetics. 15,39…”

“…Sulfur cathodes were prepared as we reported earlier. 39,49 Sulfur was dispersed in ethanol, and then acidified carbon nanotubes (CNTs) were added. Dispersing uniformly under ultrasonication, deionized water was added to the dispersion to dissipate sulfur.…”

“…High sulfur loading cathodes (4.0 mg cm −2 ) were prepared according to previous reports. 14,15,39 Super P and C–S composites were sequentially added to deionized water prior to the dissolution of CMC. The slurry was formed after stirring evenly and coated on the carbon-coated aluminum foil.…”

Regulating the kinetic behaviours of polysulfides by designing an Au–COF interface in lithium–sulfur batteries

“…With the advent of a sustainable and green energy era, the requirements for reliable high-energy-density rechargeable battery systems have increased rapidly. 1,2 However, the limited energy density of battery systems currently under development, such as lithium-ion batteries (≈387 W h kg −1 ), contradicts this growing demand. 3–5 Owing to the low cost, natural abundance, and high theoretical energy density (≈2600 W h kg −1 ), lithium–sulfur (Li–S) batteries are considered one of the most promising high-performance energy storage systems in recent years.…”