Hydrogel and sulfur co-coating on semispherical TiO2 as polysulfides-immobilized cathodes for high capacity and stable rate performance lithium-sulfur batteries

Cheng, Mengying; Han, Tianli; Zhang, Min; Zhang, Haikuo; Sun, Bai; Zhu, Shuguang; Zhai, Ming; Wu, Yaohua; Liu, Jinyun

doi:10.1016/j.apsusc.2020.145887

Cited by 28 publications

(12 citation statements)

References 39 publications

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“…Figure S11b of the Supporting Information displays three peaks corresponding to CC (284.2 eV), COH (286.1 eV), and CO (288.5 eV). [38,39] The peaks at 163.5 and 164.7 eV are assigned to the S 2p 1/2 and S 2p 3/2 , respectively, [40] as shown in Figure S11c of the Supporting Information. The Sn 3d spectrum displays two peaks (Figure S11d, Supporting Information) in which the binding energy of 487.2 eV is assigned to Sn 3d 5/2 , and the peak at 495.8 eV corresponds to Sn 3d 3/2 .…”

Section: Resultsmentioning

confidence: 99%

A Polysulfides‐Confined All‐in‐One Porous Microcapsule Lithium–Sulfur Battery Cathode

Liu

Zhu

Shen

et al. 2021

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Developing emerging materials for high energy‐density lithium–sulfur (Li–S) batteries is of great significance to suppress the shuttle effect of polysulfides and to accommodate the volumetric change of sulfur. Here, a novel porous microcapsule system containing a carbon nanotubes/tin dioxide quantum dots/S (CNTs/QDs/S) composite core and a porous shell prepared through a liquid‐driven coaxial microfluidic method as Li–S battery cathode is developed. The encapsulated CNTs in the microcapsules provide pathways for electron transport; SnO2 QDs on CNTs immobilize the polysulfides by strong adsorption, which is verified by using density functional theory calculations on binding energies. The porous shell of the microcapsule is beneficial for ion diffusion and electrolyte penetration. The void inside the microcapsule accommodates the volumetric change of sulfur. The Li–S battery based on the porous CNTs/QDs/S microcapsules displays a high capacity of 1025 mAh g−1 after 100 cycles at 0.1 C. When the sulfur loading is 2.03 mg cm−2, the battery shows a stable cycling life of 700 cycles, a Coulombic efficiency exceeding 99.9%, a recoverable rate‐performance during repeated tests, and a good temperature tolerance at both −5 and 45 °C, which indicates a potential for applications at different conditions.

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Section: Resultsmentioning

confidence: 99%

A Polysulfides‐Confined All‐in‐One Porous Microcapsule Lithium–Sulfur Battery Cathode

Liu

Zhu

Shen

et al. 2021

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“…To clarify the mechanism of polysulfide adsorption, the charge transfer and charge density difference − were investigated with Li 2 S 6 adsorption on the surface of Ti 2 CT 2 (T = −S, −F, and −O) as an example. As shown in Figure , the charge transfer Q of Li 2 S 6 for the adsorption species Li 2 S 6 @Ti 2 CS 2 , Li 2 S 6 @Ti 2 CF 2 , and Li 2 S 6 @Ti 2 CO 2 are 0.124 e, 0.112 e, and 0.772 e, respectively.…”

Section: Resultsmentioning

confidence: 99%

Theoretical Insights into the Favorable Functionalized Ti₂C-Based MXenes for Lithium–Sulfur Batteries

Zhang

Xiao

et al. 2020

ACS Omega

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Because of the high specific surface area, excellent electronic conductivity, facile Li diffusion, and rich functional groups, Ti 2 C-based MXenes have been widely used to improve the electrochemical property of lithium−sulfur batteries. The complex surface functionalization (such as −OH, −S, −F, and −O) of MXenes boosts the performance but also causes controversies about the favorable functionalized surface in the electrochemical reaction during the charge and discharge process. In the present work, a theoretical study based on density functional theory has been carried out to clarify the favorable functionalized surface by comparing pristine Ti 2 C and −OH-, −S-, −F-, and −Ofunctionalized Ti 2 C surfaces from the aspects of adsorption ability, electronic conductivity, and kinetic conversion ability. It is found that compared with severe polysulfide deformation on pristine Ti 2 C and Ti 2 C(OH) 2 surfaces, Ti 2 CO 2 , Ti 2 CS 2 , and Ti 2 CF 2 have effective polysulfide adsorption. Ti 2 CO 2 has the largest surface adsorption energy, followed by Ti 2 CS 2 , and Ti 2 CF 2 is the weakest. Meanwhile, the narrow-band gap semiconductor property of Ti 2 CO 2 during adsorption indicates worse electronic conductivity than metallic Ti 2 CS 2 and Ti 2 CF 2 . In addition, for the kinetic conversion ability, the Ti 2 CS 2 surface has the fastest polysulfide conversion and Li diffusion, followed by Ti 2 CF 2 , and Ti 2 CO 2 represents the slowest conversion and diffusion. Accordingly, because of the medium binding energy, good electronic conductivity, and fast polysulfide conversion and Li diffusion, Ti 2 CS 2 is revealed to be the favorable functionalized surface. More importantly, the origin for the Ti 2 CS 2 surface with medium adsorption ability represents the fastest polysulfide conversion, and Li diffusion is further clarified. The great affinity of the Ti 2 CS 2 surface to the product Li 2 S leads to facile polysulfide conversion. The uniform charge distribution on the Ti 2 CS 2 surface contributes to the fast Li diffusion.

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“…8g). 245 When it was assembled as a cathode in a button cell, the discharge capacity remained as high as 771 mA h g À1 aer 500 cycles at 0.5C (Fig. 8h).…”

Section: Other Pani-based Cathodesmentioning

confidence: 97%

“…In addition to the above-mentioned materials, some studies have used PANI and other 3D organic materials 242,244 or inorganic materials 74,[236][237][238][239][240][241] as composite hosts to accommodate sulfur and maintain a stable structure during cycling. Inorganics substances such as silicon dioxide [237][238][239] and titanium dioxide 245 have good chemical and mechanical properties, which can ensure the performance and structural stability of a composite material and greatly improve the electrochemical performance of Li-S batteries through their synergistic effect with PANI. For instance, Cheng et al obtained a TiO 2 @hydrogel@sulfur composite by sequentially coating a bowl-shaped TiO 2 hemispherical surface with carbon and PANI layers to store sulfur using the 3D structure of the surface (Fig.…”

Section: Other Pani-based Cathodesmentioning

confidence: 99%

Recent advances and perspectives in conductive-polymer-based composites as cathode materials for high-performance lithium–sulfur batteries

Wang

Zhang

Wei

et al. 2022

Sustainable Energy Fuels

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Hydrogel and sulfur co-coating on semispherical TiO2 as polysulfides-immobilized cathodes for high capacity and stable rate performance lithium-sulfur batteries

Cited by 28 publications

References 39 publications

A Polysulfides‐Confined All‐in‐One Porous Microcapsule Lithium–Sulfur Battery Cathode

A Polysulfides‐Confined All‐in‐One Porous Microcapsule Lithium–Sulfur Battery Cathode

Theoretical Insights into the Favorable Functionalized Ti₂C-Based MXenes for Lithium–Sulfur Batteries

Recent advances and perspectives in conductive-polymer-based composites as cathode materials for high-performance lithium–sulfur batteries

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Hydrogel and sulfur co-coating on semispherical TiO2 as polysulfides-immobilized cathodes for high capacity and stable rate performance lithium-sulfur batteries

Cited by 28 publications

References 39 publications

A Polysulfides‐Confined All‐in‐One Porous Microcapsule Lithium–Sulfur Battery Cathode

A Polysulfides‐Confined All‐in‐One Porous Microcapsule Lithium–Sulfur Battery Cathode

Theoretical Insights into the Favorable Functionalized Ti2C-Based MXenes for Lithium–Sulfur Batteries

Recent advances and perspectives in conductive-polymer-based composites as cathode materials for high-performance lithium–sulfur batteries

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Theoretical Insights into the Favorable Functionalized Ti₂C-Based MXenes for Lithium–Sulfur Batteries