Hierarchically porous TiO2 matrix encapsulated sulfur and polysulfides for high performance lithium/sulfur batteries

Liu, Ning; Wang, Lu; Zhao, Yan; Tan, Taizhe; Zhang, Yongguang

doi:10.1016/j.jallcom.2018.08.027

Cited by 27 publications

(3 citation statements)

References 42 publications

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“…41,45 However, Ning Liu et al discovered the opposite results. 46 Despite the uncertain mechanism, intensive researches have proved TiO 2 to be a strong absorber toward polysuldes. Here, the TiO 2Àx nano-shell also proved its similar role.…”

Section: Resultsmentioning

confidence: 99%

Elevated electrochemical performances enabled by a core–shell titanium hydride coated separator in lithium–sulphur batteries

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Elevated electrochemical performances enabled by a core–shell titanium hydride coated separator in lithium–sulphur batteries

et al. 2021

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“…Owing to the combined advantages for both array and closed architectures from the RTA structure, the RTA/S cathode with a large areal loading of sulfur (2.8 mg/cm 2 ) was able to exhibit significantly improved electrochemical performance over reported data from the current state-of-the-arts (Table S1). ,− …”

Section: Results and Discussionmentioning

confidence: 99%

“Room-like” TiO₂ Array as a Sulfur Host for Lithium-Sulfur Batteries: Combining Advantages of Array and Closed Structures

Zhao

Shen

Shao

et al. 2020

ACS Sustainable Chem. Eng.

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Polar oxides (POs) with array structures are widely utilized to enhance the performance of the sulfur cathode. However, the array structures with extensive open spaces are not able to trap as much lithium polysulfide species (LPSs) as closed structures, thus seriously limiting their sulfur-loading capacities. Consequently, it is highly desirable to identify alternative sulfur trapping architectures that can facilitate combined advantages of array and closed structures. Herein, we have designed a sulfur cathode based on a “room-like” TiO2 array (RTA) structure, which can not only provide an electron transport path similar to that in the array structures but also adsorb LPSs as efficient as closed structures. As a result, this cathode with a significant sulfur loading of 2.8 mg cm–2 was shown to enable remarkable utilization of sulfur together with an excellent cycle life. We also confirm that the inferior adsorption of LPSs in the array structure is not caused by insufficient adsorption sites but derives from the optimized direction of the concentration difference, which can make LPSs to exist for a longer time near host materials leading to reabsorption of dissociative LPSs. Our work offers a new avenue in enabling high sulfur loading essentials for realization of high energy density Li-S batteries.

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“…Herein, a three-dimensional TiO 2 /GO-coated separator was introduced between the Li anode and sulfur cathode as a highly efficient polysulfide absorber. The TiO 2 /GO composite was prepared by dealloying, as reported elsewhere [35], and subsequent spray drying. It has been demonstrated that the utilization of the TiO 2 /GO composite interlayer enhanced the cycling stability and charge storage capacity of Li/S batteries due to excellent conductivity of graphene oxide and strong chemical interactions between nanoporous TiO 2 and polysulfides.…”

Section: Introductionmentioning

confidence: 99%

TiO₂/GO-coated functional separator to suppress polysulfide migration in lithium–sulfur batteries

Liu¹,

Wang²,

Tan³

et al. 2019

Beilstein J. Nanotechnol.

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Lithium–sulfur batteries render a high energy density but suffer from poor cyclic performance due to the dissolution of intermediate polysulfides. Herein, a lightweight nanoporous TiO2 and graphene oxide (GO) composite is prepared and utilized as an interlayer between a Li anode and a sulfur cathode to suppress the polysulfide migration and improve the electrochemical performance of Li/S batteries. The interlayer can capture the polysulfides due to the presence of oxygen functional groups and formation of chemical bonds. The hierarchically porous TiO2 nanoparticles are tightly wrapped in GO sheets and facilitate the polysulfide storage and chemical absorption. The excellent adhesion between TiO2 nanoparticles and GO sheets resulted in enhanced conductivity, which is highly desirable for an efficient electron transfer process. The Li/S battery with a TiO2/GO-coated separator exhibited a high initial discharge capacity of 1102.8 mAh g−1 and a 100th cycle capacity of 843.4 mAh g−1, which corresponds to a capacity retention of 76.48% at a current rate of 0.2 C. Moreover, the Li/S battery with the TiO2/GO-coated separator showed superior cyclic performance and excellent rate capability, which shows the promise of the TiO2/GO composite in next-generation Li/S batteries.

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Hierarchically porous TiO2 matrix encapsulated sulfur and polysulfides for high performance lithium/sulfur batteries

Cited by 27 publications

References 42 publications

Elevated electrochemical performances enabled by a core–shell titanium hydride coated separator in lithium–sulphur batteries

Elevated electrochemical performances enabled by a core–shell titanium hydride coated separator in lithium–sulphur batteries

“Room-like” TiO₂ Array as a Sulfur Host for Lithium-Sulfur Batteries: Combining Advantages of Array and Closed Structures

TiO₂/GO-coated functional separator to suppress polysulfide migration in lithium–sulfur batteries

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Hierarchically porous TiO2 matrix encapsulated sulfur and polysulfides for high performance lithium/sulfur batteries

Cited by 27 publications

References 42 publications

Elevated electrochemical performances enabled by a core–shell titanium hydride coated separator in lithium–sulphur batteries

Elevated electrochemical performances enabled by a core–shell titanium hydride coated separator in lithium–sulphur batteries

“Room-like” TiO2 Array as a Sulfur Host for Lithium-Sulfur Batteries: Combining Advantages of Array and Closed Structures

TiO2/GO-coated functional separator to suppress polysulfide migration in lithium–sulfur batteries

Contact Info

Product

Resources

About

“Room-like” TiO₂ Array as a Sulfur Host for Lithium-Sulfur Batteries: Combining Advantages of Array and Closed Structures

TiO₂/GO-coated functional separator to suppress polysulfide migration in lithium–sulfur batteries