Fabrication of Magnéli phase Ti4O7 nanorods as a functional sulfur material host for lithium-sulfur battery cathode

Yao, Shanshan; Guo, Ruiduo; Wu, Zongzhen; Liu, Mingquan; Qian, Xinye; Shen, Xiangqian; Li, Tianbao; Wang, Li; Wang, Yanhua; Qin, Shibiao

doi:10.1007/s10832-020-00206-7

Cited by 31 publications

(10 citation statements)

References 45 publications

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“…The cyclic voltammogram (CV) was also measured to explore the reversibility of the cells with NC and CF/NC. As shown in Figure 3(b), it can be seen that two reduction peaks at 2.31–2.33 V and 2.00–2.02 V corresponds to the formation of soluble lithium polysulfides (Li 2 S x , x=4‐8) and further conversion to insoluble lithium polysulfide (Li 2 S 2 /Li 2 S) [50,51] . Thus, one oxidation at 2.4 V in the oxidation process is attributed to the transformation from Li 2 S 2 /Li 2 S to S 8 during charging.…”

Section: Resultsmentioning

confidence: 94%

Nanoscale CuFe₂O₄ Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

et al. 2021

ChemElectroChem

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Lithium‐sulfur (Li−S) batteries have been considered one of the most promising energy storage systems, owing to the theoretical specific capacity (1675 mAh g−1) and energy density (2600 Wh g−1). However, it is challenging to solve the shuttling and low reduction kinetics of lithium polysulfides. Hence, the combination of electrospun and hydrothermal treatments acts as an effective strategy to synthesize copper ferrite nanoparticles decorated on nitrogen doped carbon nanofibers (CF/NC). The resultant material is employed as a positive current collector containing Li2S6 catholyte for Li−S batteries. The addition of CF nanoparticles plays a vital role in capturing polysulfides in both physical and chemical adsorption. Besides, promoted sulfur conversion kinetics are obtained due to the excellent catalytic effect, which enabled significantly improved sulfur utilization, high‐rate capability, and cycling stability. Under a 5.75 mg sulfur loading, the cell with CF/NC delivers an excellent cycling stability with 609 mAh g−1 after 300 cycles at 0.2 C. Even at 12.15 mg high sulfur loading, the high initial capacity of the cell is 9.4 mAh at 0.1 C.

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Section: Resultsmentioning

confidence: 94%

Nanoscale CuFe₂O₄ Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

et al. 2021

ChemElectroChem

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“…The results show that the CeO 2 nanorods increased the effective contact area between electrodes and electrolyte, which maximize the contribution of the active materials to capacitance 30 . Additionally, the one‐dimensional structure of oxide nanorods has been widely investigated in the field of energy storage such as lithium‐ion and lithium‐sulfur due to their unique electrochemical properties 31,32 . The nanorod morphology has a large surface volume ration, and is proved to be an effective one‐dimensional electron transport pathways and facile strain relaxation during lithium‐ion migration 33 .…”

Section: Introductionmentioning

confidence: 99%

“…30 Additionally, the onedimensional structure of oxide nanorods has been widely investigated in the field of energy storage such as lithiumion and lithium-sulfur due to their unique electrochemical properties. 31,32 The nanorod morphology has a large surface volume ration, and is proved to be an effective one-dimensional electron transport pathways and facile strain relaxation during lithium-ion migration. 33 However, the role of gadolinium oxide (Gd 2 O 3 ) nanorods in the capturing/catalyzing polysulfides is not very clear and needs to be clarified further in detail.…”

Section: Introductionmentioning

confidence: 99%

Gadolinium oxide nanorods decorated Ketjen black@sulfur composites as functional catalyzing polysulfides conversion in lithium/sulfur batteries

Wang

et al. 2022

Intl J of Energy Research

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Summary The development of lithium/sulfur batteries (LSBs) was hindered due to the shuttling of lithium polysulfides in electrolytes and sluggish electrochemical kinetics of polysulfides. To address these stumbling blocks, we designed gadolinium oxide (Gd2O3) nanorods decoration of ketjen black@sulfur (Gd2O3/KB@S) composite that adsorbs and provides sufficient sites with lithium polysulfides interaction. The Gd2O3 nanorods play a key role in the adsorption and catalysis performance of polysulfides, which further accelerate the redox kinetics. Consequently, the Gd2O3/LB@S cathode with sulfur loading of 3.1 mg cm−2 attained a high initial discharge capacity of 817.2 mAh g−1 at 0.5 C with a decaying rate of 0.097% per cycle over 500 cycles. Even with high sulfur loading of 5 mg cm−2, the Gd2O3/KB@S cathode also presents a capacity of 5.1 mAh at 0.2 C with retention of 73% over 160 cycles. The strategy proposed here would advance the development of continuous rare earth oxides in the field of rechargeable batteries.

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“…Non stoichiometric titanium oxide (Ti n O 2n−1 ) series have excellent electrical conductivity because of oxygen vacancy in crystal. Magnéli phase Ti 4 O 7 possesses a single crystal conductivity of 1500 S/cm, chemical stability and corrosive resistance 24 . Based on these outstanding features especially conductivity, Ti 4 O 7 has been applied in some chemical power sources fields such as lead‐acid 25 , zinc‐air 26 and fuel batteries 27 .…”

Section: Introductionmentioning

confidence: 99%

“…Magnéli phase Ti 4 O 7 possesses a single crystal conductivity of 1500 S/cm, chemical stability and corrosive resistance. 24 Based on these outstanding features especially conductivity, Ti 4 O 7 has been applied in some chemical power sources fields such as lead-acid 25 , zinc-air 26 and fuel batteries. 27 Recently, L.F. Nazar and Yi Cui research groups have both utilized Ti 4 O 7 as carriers for loading sulfur in Li-S battery and even totally replaced carbon matrix in cathode.…”

Section: Introductionmentioning

confidence: 99%

Nanosized Ti ₄ O ₇ supported on carbon nanotubes composite modified separator for enhanced electrochemical properties of lithium sulfur battery

Xiao

Yao

et al. 2020

Int J Energy Res

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Summary The novel lithium sulfur (Li‐S) battery is widely concerned owing to its ultrahigh theoretical energy density of 2600 Wh/kg. However, its commercial application has been obstructed by the rapid decline of capacity and short cycle life, which is mainly because of the dissolution behavior of polysulfides into electrolyte solution and subsequently continual shuttling effect. Some strategies including carbon carriers for loading sulfur, modification of electrolyte and overall structure design of cell are brought forward to overcome the inherent defects of Li‐S battery. Modified separators with multifunctional layer are also investigated extensively and benefit from their simple preparation method and enhanced electrochemical properties. Herein, nanosized Ti4O7 supported on mildly oxidized carbon nanotubes (oCNTs‐Ti4O7) composite was synthetized and coated on the surface of separator to form modified layer, which is combined with the electrically conductive network structure of CNTs and effective adsorption of Ti4O7 nanoparticles. Compared with common separator, the modified separator with oCNTs‐Ti4O7 layer can significantly improve the utilization of active substances as an additional current collector and restrain the shuttling effect of polysulfides by combination of physical obstruction and chemical adsorption. The Li‐S battery has made great enhancements in electrochemical properties including cycle and rate performance. In particular, the cell using oCNTs‐Ti4O7 separator has released specific discharge capacities of 888 and 658 mAh/g at a current density of 0.5C for the 1st and 250th cycle with a capacity retention of 74.1%. In the rate performance test, a discharge capacity of 586 mAh/g is still remained even at a high current density of 2C. Meanwhile, the test results of diffusion behavior indicate that the modified layer would not affect the normal transmission of lithium ions.

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Fabrication of Magnéli phase Ti4O7 nanorods as a functional sulfur material host for lithium-sulfur battery cathode

Cited by 31 publications

References 45 publications

Nanoscale CuFe₂O₄ Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

Nanoscale CuFe₂O₄ Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

Gadolinium oxide nanorods decorated Ketjen black@sulfur composites as functional catalyzing polysulfides conversion in lithium/sulfur batteries

Nanosized Ti ₄ O ₇ supported on carbon nanotubes composite modified separator for enhanced electrochemical properties of lithium sulfur battery

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Fabrication of Magnéli phase Ti4O7 nanorods as a functional sulfur material host for lithium-sulfur battery cathode

Cited by 31 publications

References 45 publications

Nanoscale CuFe2O4 Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

Nanoscale CuFe2O4 Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

Gadolinium oxide nanorods decorated Ketjen black@sulfur composites as functional catalyzing polysulfides conversion in lithium/sulfur batteries

Nanosized Ti 4 O 7 supported on carbon nanotubes composite modified separator for enhanced electrochemical properties of lithium sulfur battery

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Nanoscale CuFe₂O₄ Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

Nanoscale CuFe₂O₄ Uniformly Decorated on Nitrogen‐Doped Carbon Nanofibers as Highly Efficient Catalysts for Polysulfide Conversion in Lithium‐Sulfur Batteries

Nanosized Ti ₄ O ₇ supported on carbon nanotubes composite modified separator for enhanced electrochemical properties of lithium sulfur battery