Heterostructures Regulating Lithium Polysulfides for Advanced Lithium‐Sulfur Batteries

Abstract

Sluggish reaction kinetics and severe shuttling effect of lithium polysulfides seriously hinder the development of lithium‐sulfur batteries. Heterostructures, due to unique properties, have congenital advantages that are difficult to be achieved by single‐component materials in regulating lithium polysulfides by efficient catalysis and strong adsorption to solve the problems of poor reaction kinetics and serious shuttling effect of lithium‐sulfur batteries. In this review, the principles of heterostructures expediting lithium polysulfides conversion and anchoring lithium polysulfides are detailly analyzed, and the application of heterostructures as sulfur host, interlayer, and separator modifier to improve the performance of lithium‐sulfur batteries are systematically reviewed. Finally, the problems that need to be solved in the future study and application of heterostructures in lithium‐sulfur batteries are prospected. This review will provide a valuable reference for the development of heterostructures in advanced lithium sulfur batteries.This article is protected by copyright. All rights reserved

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

“…Meanwhile, the manufacture of a functional separator with “chemical traps” can chemically capture polysulfides to restrain the shuttle effect. 19–21 To date, various materials, such as metal oxides/carbides/nitrides, 22–24 carbon-based materials, 25 organic polymers 26 and metal–organic/covalent organic framework materials, 27 have been successfully used as functional separators, effectively improving the comprehensive electrochemical performance of Li–S batteries. Especially, more and more attention has been paid to covalent organic framework (COF) materials owing to their characteristics of functional diversity and controllable pore size.…”

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

“…1–3 As one of the best energy storage systems, Li–S batteries have attracted much attention because of their high theoretical capacity for the cathode (1675 mA h g −1 ) and high energy density (2600 W h kg −1 ). 4–8 Besides, the active substances (S) in Li–S batteries have the characteristics of a vast source, low price, and environmental friendliness. 9 However, the products during operation (polysulfides) of Li–S batteries are easily dissolved in electrolytes and spread back and forth between cathodes and anodes, causing the notorious ‘shuttle effect’.…”

MoO2/t-C3N4 Heterogeneous Materials with Bidirectional Catalysis for the Rapid Conversion of S Species in Li–S Batteries

“…After a long period of exploration by researchers, in the current research on the modification of LSBs, the aspects of cathode design, anode protection, separator modification and electrolyte conditioning have become the consensus to enhance the performance of LSBs. − From a practical point of view, the design of the S cathode is a major priority because the energy density of LSBs is primarily dependent on the area capacity of the S cathode . The two most common methods for reducing shuttle effects in S cathode studies are physical confinement and chemisorption .…”