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a, b The CV curves of CC/MoO3@Li2S8 electrode and C@S electrode at 0.1 mV s⁻¹; c, d the galvanostatic charge/discharge curves of CC/MoO3@Li2S8 electrode and C@S electrode at a current density of 1 C; e the cycle performance of CC/MoO3@Li2S8 and C@S electrode at 1 C current density after initial three activations at 0.1 C with S loading 2.0 mg cm⁻² (sulfur loading of CC/MoO3@Li2S8 electrode is calculated based on the mass of sulfur in Li2S8, and the sulfur loading of C@S electrode is calculated based on the mass of elemental sulfur)
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Lithium-sulfur battery is expected to be the new generation of high-performance electrochemical storage system benefiting from its high energy density and low cost. However, the slow redox kinetics caused by the low conductivity of sulfur and the shuttle effect result from lithium polysulfides (LiPSs) limit its practical utility. In this work, a hi...
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Lithium-sulfur (Li-S) batteries are considered to be one of the candidates for high-energy density storage systems due to their ultra-high theoretical specific capacity of 1675 mA h g-1. However, problems of rapid capacity decay, sharp expansion in volume of the active material, and the shuttle effect have severely restricted their subsequent devel...
Citations
... To date, carbon cloth combined with active substances has been used in fuel cells [106], catalysis [107], lithium-sulfur batteries [108,109], supercapacitors [102], etc. There have also been some studies on carbon cloth combined with metallic chalcogenide compounds as negative electrodes for LIBs [110]. ...
Transition metal selenides have narrow or zero band-gap characteristics and high theoretical specific capacity. Among them, cobalt selenide and cobalt telluride have some typical problems such as large volume changes, low conductivity, and poor structural stability, but they have become a research hotspot in the field of energy storage and conversion because of their high capacity and high designability. Some of the innovative synthesis, doping, and nanostructure design strategies for CoSex and CoTex, such as CoSe-InCo-InSe bimetallic bi-heterogeneous interfaces, CoTe anchoring MXenes, etc., show great promise. In this paper, the research progress on the multistep transformation mechanisms of CoSex and CoTex is summarized, along with advanced structural design and modification methods such as defect engineering and compositing with MXenes. It is hoped that this review will provide a glimpse into the development of CoSex and CoTex anodes for alkali-ion batteries.
... Lithium-sulfur (Li-S) batteries with superior theoretical specific capacity, environmental-friendliness and low cost are the hopeful next-generation energy storage systems [1][2][3]. However, the practical application of Li-S batteries is plagued by many technical bottlenecks; especially, the shuttle effect induced by dissolution of the lithium polysulfides (LiPSs) leads to sluggish redox kinetics and worse sulfur utilization [4][5][6]. Actually, the generated polysulfides can spread from cathode to anode, and polysulfides are reduced to insoluble Li 2 S [7]. Therefore, utilizing a functional interlayer between separator and sulfur cathode to hinder shuttling is a feasible strategy [8][9][10]. ...
The elaborate design of functional separators is considered as an effective and economical approach to accelerate the conversion of sulfur species and inhibit shuttling effect of soluble lithium polysulfides (LiPSs). This work chooses ZIF-67 and H5PW10V2O40·30H2O (PW10V2) as the precursors to construct MOF/POM composite by electrostatic interaction as the modified material of separator in lithium–sulfur (Li–S) batteries. ZIF-67 with suitable size window of micropores functions as a physical barrier to hinder polysulfides shuttling, while lithium ions can flow freely across the modified separator. Furthermore, PW10V2 presents firm chemical anchoring for LiPSs and displays excellent catalytic activity for polysulfides, which is conducive to preventing the soluble polysulfides from reaching lithium anode and kinetically facilitating sulfur redox reaction kinetics. Consequently, Li–S cells with ZIF-67/PW10V2-modified functional separators display an initial discharge capacity of 1637.6 mAh g⁻¹ under 0.2 C. After 120 cycles, superior reversible capacities of 1054.6 mAh g⁻¹ under 0.5 C and 802.7 mAh g⁻¹ under 2 C can still be maintained.
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