A Strategy for Polysulfides/Polyselenides Protection Based on Co9S8@SiO2/C Host in Na‐SeS2 Batteries

Yang, Tingting; Qi, Yuruo; Zhong, Wei; Tao, Mengli; Guo, Bingshu; Wu, Yuanke; Bao, Shu‐Juan; Xu, Maowen

doi:10.1002/adfm.202001952

Cited by 37 publications

(16 citation statements)

References 39 publications

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“…Moreover, the active anionic free radicals of S 7 − , S 5 − , and S 3 − centered at 533 cm −1 are observed [ 69 ]. Meanwhile, the characteristic peaks of chain-liked Se n 2− (260 cm −1 ) and active anionic free radical Se 2 − (320–350 cm −1 ) are also observed [ 70 , 71 ]. All above results indicate that the Li 2 S n and Li 2 Se n generated during the early stage of the first discharge process can be well anchored by the CF@CNTs-NPP interlayer.…”

Section: Resultsmentioning

confidence: 99%

A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li–SeS2 Batteries

et al. 2021

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SeS2 has become a promising cathode material owing to its enhanced electrical conductivity over sulfur and higher theoretical specific capacity than selenium; however, the working Li–SeS2 batteries have to face the practical challenges from the severe shuttling of soluble dual intermediates of polysulfide and polyselenide, especially in high-SeS2-loading cathodes. Herein, a natural organic polymer, Nicandra physaloides pectin (NPP), is proposed to serve as an effective polysulfide/polyselenide captor to address the shuttling issues. Informed by theoretical calculations, NPP is competent to provide a Lewis base-based strong binding interaction with polysulfides/polyselenides via forming lithium bonds, and it can be homogeneously deposited onto a three-dimensional double-carbon conductive scaffold to finally constitute a polysulfide/polyselenide-immobilizing interlayer. Operando spectroscopy analysis validates the enhanced polysulfide/polyselenide trapping and high conversion efficiency on the constructed interlayer, hence bestowing the Li–SeS2 cells with ultrahigh rate capability (448 mAh g−1 at 10 A g−1), durable cycling lifespan (≈ 0.037% capacity attenuation rate per cycle), and high areal capacity (> 6.5 mAh cm−2) at high SeS2 loading of 15.4 mg cm−2. Importantly, pouch cells assembled with this interlayer exhibit excellent flexibility, decent rate capability with relatively low electrolyte-to-capacity ratio, and stable cycling life even under a low electrolyte condition, promising a low-cost, viable design protocol toward practical Li–SeS2 batteries.

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Section: Resultsmentioning

confidence: 99%

A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li–SeS2 Batteries

et al. 2021

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“…Most researchers summarized that metal sulfides possess sulfiphilic sites for robustly interacting with polysulfides and higher electroconductibilities than metal oxides because of their delocalized electronic microstructures. [ 206–213 ] When TiS 2 , ZrS 2 , and VS 2 were employed as cathode materials, they were able to promote fast charge transfer and mild bonding with polysulfides. [ 214 ] As a result, reduction and oxidation reactions of polysulfides were accelerated during cycling, thereby resulting in superior rate capabilities.…”

Section: Catalytic Conversion Of Polysulfides By Mofs‐derived Nanostructuresmentioning

confidence: 99%

Metal–Organic‐Framework‐Derived Nanostructures as Multifaceted Electrodes in Metal–Sulfur Batteries

Yan

Cheng

et al. 2021

Advanced Materials

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Metal‐sulfur batteries (MSBs) are considered up‐and‐coming future‐generation energy storage systems because of their prominent theoretical energy density. However, the practical applications of MSBs are still hampered by several critical challenges, i.e., the shuttle effects, sluggish redox kinetics, and low conductivity of sulfur species. Recently, benefiting from the high surface area, regulated networks, molecular/atomic‐level reactive sites, the metal‐organic frameworks (MOFs)‐derived nanostructures have emerged as efficient and durable multifaceted electrodes in MSBs. Herein, a timely review is presented on recent advancements in designing MOF‐derived electrodes, including fabricating strategies, composition management, topography control, and electrochemical performance assessment. Particularly, the inherent charge transfer, intrinsic polysulfide immobilization, and catalytic conversion on designing and engineering of MOF nanostructures for efficient MSBs are systematically discussed. In the end, the essence of how MOFs’ nanostructures influence their electrochemical properties in MSBs and conclude the future tendencies regarding the construction of MOF‐derived electrodes in MSBs is exposed. It is believed that this progress review will provide significant experimental/theoretical guidance in designing and understanding the MOF‐derived nanostructures as multifaceted electrodes, thus offering promising orientations for the future development of fast‐kinetic and robust MSBs in broad energy fields.

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“…On the one hand, Se x S y alloys may help maintain the high capacity of S and also improve the poor electronic conductivity of S by virtue of the presence of Se. [71][72][73] The capacities of Se x S y cathodes are far higher than that of S and slightly lower than Se, and the proportion of Se and S in Se x S y alloys can be flexibly tuned. On the other hand, it should be noted that Se x S y cathodes exhibit very similar electrochemical properties with Se, so they may also face some tendency toward shuttle effect and large volume changes during cycling.…”

Section: Hybridization Of Se and S Moleculesmentioning

confidence: 99%

“…For instance, Yang et al inserted an interlayer that was produced by MoS 2 nanosheet-decorated hollow carbon spheres (HCS/MoS 2 ) in room-temperature Na-S batteries. [71] The interlayer robustly anchored reaction intermediates, thus inhibiting their shuttling to Na anodes and preventing the deterioration of metal Na surfaces. Therefore, their Na-S batteries showed a long cycling lifespan at 1C with a high CE of 100%.…”

Section: (18 Of 21)mentioning

confidence: 99%

Rechargeable Potassium–Selenium Batteries

Huang

Guo

Dou

et al. 2021

Adv Funct Materials

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Rechargeable potassium-selenium (K-Se) batteries, as an emerging electrochemical energy storage system, has recently captured intensive attention due to the desirable natural abundance and low redox potential of elemental potassium as well as the relatively high electronic conductivity and impressive theoretical volumetric capacity of elemental selenium. Although great progress on cathode materials design and electrochemical performance improvement has been made, K-Se batteries are still confronted with a series of key challenges, including low reactive activity, shuttle effect, volume expansion, potassium dendrite growth, and high chemical activity of potassium metal. The recent advances in rechargeable K-Se batteries are comprehensively summarized with an emphasis on discussing the electrochemical mechanisms and central challenges, presenting the synthesis, properties, and electrochemical performance of selenium-based cathode materials, and extending potential tactics for tackling the key issues and developmental directions for future research.

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A Strategy for Polysulfides/Polyselenides Protection Based on Co₉S₈@SiO₂/C Host in Na‐SeS₂ Batteries

Cited by 37 publications

References 39 publications

A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li–SeS2 Batteries

A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li–SeS2 Batteries

Metal–Organic‐Framework‐Derived Nanostructures as Multifaceted Electrodes in Metal–Sulfur Batteries

Rechargeable Potassium–Selenium Batteries

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