Amorphous/crystalline heterostructure design enables highly efficient adsorption–diffusion–conversion of polysulfides for lithium–sulfur batteries

Abstract

Electrocatalytic conversion of soluble lithium polysulfides (LiPSs) has been proposed as a crucial approach to address the drawbacks of lithium-sulfur (Li-S) batteries. However, it still remains great challenging to realize...

Rapid Growth of Bi2Se3 Nanodots on MXene Nanosheets at Room Temperature for Promoting Sulfur Redox Kinetics

“…First, the existence of Bi 2 Se 3 nanodots was able to enhance the adsorption force of the Bi 2 Se 3 @MXene composite, which could adsorb LiPSs and inhibit their shuttling, resulting in an improved capacity retention. 59,60 Second, Bi 2 Se 3 could effectively catalyze and boost the LiPS conversion, promoting the rate performance. 59,60 Third, the Bi 2 Se 3 nanodots could block the severe stacking of 2D MXene nanosheets, resulting in enough active sites to control the Li−S electrochemistry.…”

“…59,60 Second, Bi 2 Se 3 could effectively catalyze and boost the LiPS conversion, promoting the rate performance. 59,60 Third, the Bi 2 Se 3 nanodots could block the severe stacking of 2D MXene nanosheets, resulting in enough active sites to control the Li−S electrochemistry. 39 In addition, the MXene substrate owned certain adsorption and catalysis ability with LiPSs.…”

“…After the above experimental and DFT investigation, it could be concluded that the better performance of Bi 2 Se 3 @MXene/S cathode was mainly due to the Bi 2 Se 3 on MXene. First, the existence of Bi 2 Se 3 nanodots was able to enhance the adsorption force of the Bi 2 Se 3 @MXene composite, which could adsorb LiPSs and inhibit their shuttling, resulting in an improved capacity retention. , Second, Bi 2 Se 3 could effectively catalyze and boost the LiPS conversion, promoting the rate performance. , Third, the Bi 2 Se 3 nanodots could block the severe stacking of 2D MXene nanosheets, resulting in enough active sites to control the Li–S electrochemistry . In addition, the MXene substrate owned certain adsorption and catalysis ability with LiPSs .…”

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

“…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. 6–9 Unfortunately, there is still a big gap between the actual and theoretical energy densities of Li–S batteries due to some serious issues, among which the sluggish/incomplete conversion kinetic and shuttle effect of polysulfides results in the attenuation of capacity, severe self-discharge, and loss of active substances. 10–13…”