Three-dimensional hierarchical porous TiO2/graphene aerogels as promising anchoring materials for lithium‒sulfur batteries

Wang, Jia; Fu, Cuimei; Wang, Xiaofei; Yao, Yimin; Sun, Minglin; Wang, Lina; Liu, Tianxi

doi:10.1016/j.electacta.2018.09.109

Cited by 43 publications

(21 citation statements)

References 51 publications

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“…The high-resolution XPS spectrum of Ti 2p in Figure 3d shows two components of Ti 2p 3/2 and Ti 2p 1/2 at 458.8 and 464.5 eV, respectively, confirming the presence of Ti in the form of Ti 4+ . [52] The splitting energy of 5.7 eV between Ti 2p 3/2 and Ti 2p 1/2 peaks is in agreement with the standard value of Ti atom in TiO 2 . The high-resolution XPS spectra of C 1s and Ti 2p for the TiC precursors are shown in Figure S6 in the Supporting Information.…”

Section: B 1gsupporting

confidence: 84%

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO₂ Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Zhang

Yuan

Yang

et al. 2020

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The performance of lithium–sulfur (Li–S) batteries is greatly hindered by the notorious shuttle effect of lithium polysulfides (LiPSs). To address this issue, in situ topochemical oxidation derivative TiC@carbon‐included TiO2 (TiC@C‐TiO2) core–shell composite is designed and proposed as a multifunctional sulfur host, which integrates the merits of conductive TiC core to facilitate the redox reaction kinetics of sulfur species, and porous C‐TiO2 shell to suppress the dissolution and shuttling of LiPSs through chemisorption. A unique dual chemical mediation mechanism is demonstrated for the proposed TiC@C‐TiO2 composite that synergistically entraps LiPSs through thiosulfate/polythionate conversion coupled with strong polar–polar interaction. The morphological characterization reveals that the TiC@C‐TiO2‐based cathode can well regulate the distribution of electrode materials to retard their accumulation inside the electrode, ensuring effective contact between the active materials and electrolyte. Based on its unique function and structure, the cathode delivers an improved capacity of 1256 mAh g−1 at 0.2C, a remarkable rate capability of 643 mAh g−1, and an ultralow capacity decay rate of 0.065% per cycle at 2C over 900 cycles. This work not only demonstrates a dual chemical mediation mechanism to immobilize LiPSs, but also provides a universal strategy to construct multifunctional sulfur hosts for advanced Li–S batteries.

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Section: B 1gsupporting

confidence: 84%

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO₂ Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Zhang

Yuan

Yang

et al. 2020

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“…The highly soluble intermediate products of lithium polysulfides (Li 2 S n , 2 < n ≤ 8), however, result in internal shuttle of the cell as well as undesirable parasitic reactions with the Li anode . Besides, the cathode suffers from a 70–80% volume expansion when sulfur is finally reduced to Li 2 S, and the electrical insulating nature of S 8 (5 × 10 −30 S cm −1 ) and Li 2 S (10 −13 S cm −1 ) requires the addition of a large amount of conductive carbons which consequently reduce the realistic energy density . Up to now, considerable efforts have been made to prevent the diffusion and nonelectrochemical reactions of Li 2 S n .…”

Section: Introductionmentioning

confidence: 99%

Sulfurized Polyacrylonitrile Cathodes with High Compatibility in Both Ether and Carbonate Electrolytes for Ultrastable Lithium–Sulfur Batteries

Wang

Qian

Wang

et al. 2019

Adv Funct Materials

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Sulfurized polyacrylonitrile (SPAN) is a promising material capable of suppressing polysulfide dissolution in lithium-sulfur (Li-S) batteries with carbonate electrolyte. However, undesirable spontaneous formation of soluble polysulfides may arise in the ether electrolyte, and the conversion of sulfur in SPAN during the lithiation/delithiation processes is yet to be understood. Here, a highly reliable Li-S system using a freestanding fibrous SPAN cathode, as well as the sulfur conversion mechanism involved, is demonstrated. The SPAN shows high compatibility in both ether and carbonate electrolytes. The sulfur atoms existing in the form of short S 2  and S 3  chains are covalently bonded to the pyrolyzed PAN backbone. The electrochemical reduction of the SPAN by Li + is a single-phase solid-solid reaction with Li 2 S as the sole discharge product. Meanwhile, the parasitic reaction between Li + and CN bonds exists upon the first discharge, and the residual Li + enhances the conductivity of the backbone. The recharge ability and rate capability are kinetically dominated by the activation of Li 2 S nanoflakes generated during discharge. At 800 mA g −1 , a specific capacity of 1180 mAh g −1 is realized without capacity fading in the measured 1000 cycles, which makes SPAN promising for practical application.

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“…Lithium-sulfur (Li-S) batteries have become a hot topic due to their excellent specic capacity (1675 mA h g À1 ) and theoretical energy density (2600 W h kg À1 ). [1][2][3][4][5] Nevertheless, performances of Li-S batteries are not satisfactory as in theory. Typical weaknesses include poor cycle stability, unimpressive rate performance and unsatisfactory energy production due to the dissolved polysulde intermediates (Li 2 S x , 4 # x # 8) in the electrolyte, and the low electrical and ionic conductivity of elemental sulfur and its nal discharge product.…”

Section: Introductionmentioning

confidence: 99%

Study of the discharge/charge process of lithium–sulfur batteries by electrochemical impedance spectroscopy

et al. 2020

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Three-dimensional hierarchical porous TiO2/graphene aerogels as promising anchoring materials for lithium‒sulfur batteries

Cited by 43 publications

References 51 publications

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO₂ Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO₂ Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Sulfurized Polyacrylonitrile Cathodes with High Compatibility in Both Ether and Carbonate Electrolytes for Ultrastable Lithium–Sulfur Batteries

Study of the discharge/charge process of lithium–sulfur batteries by electrochemical impedance spectroscopy

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Three-dimensional hierarchical porous TiO2/graphene aerogels as promising anchoring materials for lithium‒sulfur batteries

Cited by 43 publications

References 51 publications

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO2 Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO2 Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Sulfurized Polyacrylonitrile Cathodes with High Compatibility in Both Ether and Carbonate Electrolytes for Ultrastable Lithium–Sulfur Batteries

Study of the discharge/charge process of lithium–sulfur batteries by electrochemical impedance spectroscopy

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Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO₂ Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries

Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon‐Included TiO₂ Core–Shell Sulfur Hosts for Advanced Lithium–Sulfur Batteries