Synthesis, characterization, and electrochemical performance of spherical nanostructure of Magnéli phase Ti4O7

Yao, Shanshan; Xue, Sikang; Ying-ji, Zhang; Shen, Xiangqian; Qian, Xinye; Li, Tianbao; Xiao, Kesong; Qin, Shibiao; Xiang, Jun

doi:10.1007/s10854-017-6410-z

Cited by 41 publications

(21 citation statements)

References 28 publications

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“…This is reasonable since the addition of g‐C 3 N 4 will reduce the electronic conductivity of the composite. The value of D Li+ was further calculated according to Equations S1 and S2 …”

Section: Resultsmentioning

confidence: 99%

“…The value of D Li+ was further calculated according to Equations S1 and S2. 41,42 Based on these equation formulas, the real part of the impedance concerned with chemical diffusion is represented by Z re and the angular frequency is expressed by ω. Figure 8C shows the relationship between Z re and ω −0.5 and the slope value of Z re and ω −0.5 curve is σ.…”

Section: Resultsmentioning

confidence: 99%

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Freestanding graphitic carbon nitride‐based carbon nanotubes hybrid membrane as electrode for lithium/polysulfides batteries

Yao

Guo

et al. 2020

Int J Energy Res

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Summary Lithium sulfur batteries have drawled worldwide attention in recent years, which benefit of its high‐density energetic, low cost, and environmental benignity. Nevertheless, the shuttle effect of polysulfides and resulting self‐discharge lead to capacity fade loss and poor electrochemical performance. Herein, graphitic‐carbon nitride/carbon nanotubes (g‐C3N4/CNTs) hybrid membrane is fabricated by the flow‐direct vacuum filtration process. The as‐prepared 3‐D freestanding g‐C3N4/CNTs membrane employed as positive current collector containing Li2S6 catholyte solution for lithium/polysulfides batteries. The fabricated g‐C3N4/CNTs provide a physical barriers and chemisorption resist polysulfide shuttling. Moreover, the conductive network constructed by CNTs can empower sulfur to be evenly distributed in the cathode and accelerates electron transport. Thus, to further prove the cooperative effect of g‐C3N4 and CNTs, the freestanding g‐C3N4/CNTs/Li2S6 electrode exhibits more stable electrochemical performance than CNTs/Li2S6 electrode, deliver the first discharge capacity of 876 mAh g−1 at 0.5 C and maintained at 633 mAh g−1 after 300 cycles. The sulfur mass in electrode was increased to 7.11 mg, and the g‐C3N4/CNTs/Li2S6 electrode also possess a high capacity retention of 75.5%. Meanwhile, g‐C3N4 modified CNTs can not only trap polysulfides by strong adsorption but also effectively inhibit the self‐discharge behavior of lithium/polysulfides batteries. As a consequence, the g‐C3N4/CNTs composites for lithium/polysulfides batteries are indicating an excellent electrochemical stability with a long‐term storage without obvious capacity degradation.

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“…This is reasonable since the addition of g‐C 3 N 4 will reduce the electronic conductivity of the composite. The value of D Li+ was further calculated according to Equations S1 and S2 …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Freestanding graphitic carbon nitride‐based carbon nanotubes hybrid membrane as electrode for lithium/polysulfides batteries

Yao

Guo

et al. 2020

Int J Energy Res

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“…The narrow linewidth of the (reactionr ate) peaks confirmgood electricalc ontact andi nsignificant overcharging behavior, which was restricted as much as possible by maintaining ad ischarge voltagew indow between 1.8 and 2.6 V. Impedance spectroscopic data in Figure 6f of the as-assembled cell at open-circuit potential, and after five cycles of charging and discharging, also corroborates the cyclic-voltammetry and overall cell-testing findings. [56,57] The response also indicates au niform distribution of sulfur,w hich was confirmed by EDS mapping of exhausted electrodes( see Figure 6a-d). Noteworthy is the stable, highly conductive nature of the cycled cathode materials, which comprise metallic (Ti 4 O 7 )a sw ell as semiconducting (Ti 6 O 11 )a nd other Ti n O 2nÀ1 phases.O nc ycling, the charge-transfer resistance is reduced from 83 to 15 W,s ignifyingr eliable solid-electrolyte interface (SEI) layer formation.…”

Section: Stables Ulfur Cathode Performance In Li-s Cellsmentioning

confidence: 53%

“…Noteworthy is the stable, highly conductive nature of the cycled cathode materials, which comprise metallic (Ti 4 O 7 )a sw ell as semiconducting (Ti 6 O 11 )a nd other Ti n O 2nÀ1 phases.O nc ycling, the charge-transfer resistance is reduced from 83 to 15 W,s ignifyingr eliable solid-electrolyte interface (SEI) layer formation. [56,57] The response also indicates au niform distribution of sulfur,w hich was confirmed by EDS mapping of exhausted electrodes( see Figure 6a-d).…”

Section: Stables Ulfur Cathode Performance In Li-s Cellsmentioning

confidence: 53%

Polysulfide Binding to Several Nanoscale Magnéli Phases Synthesized in Carbon for Long‐Life Lithium–Sulfur Battery Cathodes

et al. 2018

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In Li-S batteries, it is important to ensure efficient reversible conversion of sulfur to lithium polysulfide (LiPS). Shuttling effects caused by LiPS dissolution can lead to reduced performance and cycle life. Although carbon materials rely on physical trapping of polysulfides, polar oxide surfaces can chemically bind LiPS to improve the stability of sulfur cathodes. We show a simple synthetic method that allows high sulfur loading into mesoporous carbon preloaded with spatially localized nanoparticles of several Magnéli-phase titanium oxide (Ti O ). This material simultaneously suppresses polysulfide shuttling phenomena by chemically binding Li polysulfides onto several Magnéli-phase surfaces in a single cathode and ensures physical confinement of sulfur and LiPS. The synergy between chemical immobilization of significant quantities of LiPS at the surface of several Ti O phases and physical entrapment results in coulombically efficient high-rate cathodes with long cycle life and high capacity. These cathodes function efficiently at low electrolyte-to-sulfur ratios to provide high gravimetric and volumetric capacities in comparison with their highly porous carbon counterparts. Assembled coin cells have an initial discharge capacity of 1100 mAh g at 0.1C and maintain a reversible capacity of 520 mAh g at 0.2C for more than 500 cycles. Even at 1C, the cell loses only 0.06 % per cycle for 1000 cycles with a coulombic efficiency close to 99 %.

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“…Based on the TiO 2 , sulfiphilic Ti 4 O 7 was also considered as a promising sulfur host in Li–S batteries . Ti 4 O 7 , with 2D shear‐plane slabs of Ti–O octahedral structures has the advantage of high electronic conductivity.…”

Section: Metal Oxides As Sulfur Hosts For Li–s Batteriesmentioning

confidence: 99%

Novel Non‐Carbon Sulfur Hosts Based on Strong Chemisorption for Lithium–Sulfur Batteries

Zhu

Wang

Miao

et al. 2018

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Lithium-sulfur (Li-S) batteries are considered as promising candidates for energy storage systems owing to their high theoretical capacity and high energy density. The application of Li-S batteries is hindered by several obstacles, however, including the shuttle effect, poor electrical conductivity, and the severe volume expansion of sulfur. The traditional method is to integrate sulfur with carbon materials. But the interaction between polysulfide intermediates and carbon is only weak physical adsorption, which easily leads to the escape of species from the framework (shuttle effect) of the material causing capacity loss. Recently, however, there has been a trend for the introduction of novel non-carbon materials as sulfur hosts based on the strong chemisorption. This review highlights recent research progress on novel non-carbon sulfur hosts based on strong chemisorption, in Li-S batteries. In comparison with carbon-based sulfur hosts, most non-carbon sulfur hosts have been demonstrated to be polar host materials that could efficiently adsorb polysulfide via strong chemisorption, mitigating their dissolution. The intrinsic mechanism associated with the role of non-carbon-based host materials in improving the performance of Li-S batteries is discussed.

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Synthesis, characterization, and electrochemical performance of spherical nanostructure of Magnéli phase Ti4O7

Cited by 41 publications

References 28 publications

Freestanding graphitic carbon nitride‐based carbon nanotubes hybrid membrane as electrode for lithium/polysulfides batteries

Freestanding graphitic carbon nitride‐based carbon nanotubes hybrid membrane as electrode for lithium/polysulfides batteries

Polysulfide Binding to Several Nanoscale Magnéli Phases Synthesized in Carbon for Long‐Life Lithium–Sulfur Battery Cathodes

Novel Non‐Carbon Sulfur Hosts Based on Strong Chemisorption for Lithium–Sulfur Batteries

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