Anchoring Mo2C nanoparticles on vertical graphene nanosheets as a highly efficient catalytic interlayer for Li-S batteries

Mo, Yangcheng; Lin, Jing‐Yu; Li, Shuchan; Yu, Jie

doi:10.1016/j.cej.2021.134306

Cited by 37 publications

(17 citation statements)

References 61 publications

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“…A separator is a key component that serves the dual purpose of preventing internal short circuits while enabling lithium ions to pass through the battery. In addition, the modified separator could effectively hinder the shuttle effect while maintaining the load of active materials. ,, Various materials, such as carbon materials via heteroatom doping, − transition metal sulfides (MoS 2 , VS 4 ), nitrides (MoN, WN 0.67 ), metal carbides (Mo 2 C), and oxides, , have been developed to functionalize the separator of the cathode-facing side. Recently, scientists have found some correlations between adsorption and catalysis in Li–S batteries.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Adsorption-Electrocatalysis of Mo–MoB Heterostructures for Lithium–Sulfur Batteries

Guo

Zhao

Miao

et al. 2022

ACS Appl. Energy Mater.

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Because of the high theoretical capacity of lithium–sulfur (Li–S) batteries and the relatively low cost of sulfur, these batteries have been regarded as one of the most promising types of energy storage systems. The severe shuttle effect of the polysulfide deteriorates the cycle stability, and the inferior conductivity of the sulfur and polysulfide also lead to sluggish electrochemical kinetics. Herein, we use a facile molten salt method to synthesize the heterostructure Mo–MoB, which is coated on a commercial PP separator for the Li–S batteries. Experimental analysis and theoretical calculation results show that the heterostructure Mo–MoB can serve as a physical barrier and chemical absorbent to hinder the shuttle effect, as well as be a bidirectional catalyst to simultaneously accelerate the conversion of polysulfides into Li2S and decomposition of Li2S with the synergistically catalytic effect of Mo and MoB. Consequently, the cell with the heterostructure Mo–MoB-modified separator demonstrates superior cycle performance (capacity fading rate of ∼0.07% per cycle during 300 cycles at 0.5 C) as well as increased rate capability (670 mAh g–1 at 2 C). This work indicates that heterostructure metal borides could be adsorption-catalysis material to functionalize the separator, which can be a new strategy to design the high-performance Li–S batteries.

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Section: Introductionmentioning

confidence: 99%

Synergistic Adsorption-Electrocatalysis of Mo–MoB Heterostructures for Lithium–Sulfur Batteries

Guo

Zhao

Miao

et al. 2022

ACS Appl. Energy Mater.

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Section: Tmcs In Li–s Batteriesmentioning

confidence: 99%

“…Molybdenum carbide (Mo 2 C) possessed a strong affinity for polysulfides, which allowed for effective suppression of shuttle effects and a stable anchoring transformation of the polysulfides. Mo et al 158 reported a powerful electrocatalyst (CG-CFG@ Mo 2 C) for Li−S batteries. The structure of the stacked graphene backbone greatly enhanced charge transfers and fully exposed active materials.…”

Section: Tmcs In Li−s Batteriesmentioning

confidence: 99%

Understanding the Catalytic Kinetics of Polysulfide Redox Reactions on Transition Metal Compounds in Li–S Batteries

Wang

et al. 2022

ACS Nano

189

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Because of their high energy density, low cost, and environmental friendliness, lithium−sulfur (Li−S) batteries are one of the potential candidates for the next-generation energy-storage devices. However, they have been troubled by sluggish reaction kinetics for the insoluble Li 2 S product and capacity degradation because of the severe shuttle effect of polysulfides. These problems have been overcome by introducing transition metal compounds (TMCs) as catalysts into the interlayer of modified separator or sulfur host. This review first introduces the mechanism of sulfur redox reactions. The methods for studying TMC catalysts in Li−S batteries are provided. Then, the recent advances of TMCs (such as metal oxides, metal sulfides, metal selenides, metal nitrides, metal phosphides, metal carbides, metal borides, and heterostructures) as catalysts and some helpful design and modulation strategies in Li−S batteries are highlighted and summarized. At last, future opportunities toward TMC catalysts in Li−S batteries are presented.

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“…The average capacity decay is 0.098% per cycle when discharging at 0.5C after 400 cycles at a sulfur loading of 1.8 mg cm −2 . 33…”

Section: Introductionmentioning

confidence: 99%

“…Mo et al introduced Mo 2 C nanoparticles to the CG-CFG substrate by heating the slurry containing the Mo element. 33 Similarly, the abundant conductive pathways for charge transfer of the CFG substrate and the high electrocatalysis of Mo 2 C nanoparticles synergistically improve the battery performance. LSBs with the carbon/Fe/Fe 3 C interlayer have a high initial specific discharge capacity of 1632 mA h g −1 and a low capacity decay of 0.098% per cycle at 0.5C after 400 cycles at a sulfur loading of 1.8 mg cm −2 .…”

Section: Introductionmentioning

confidence: 99%

Advanced cathodic free-standing interlayers for lithium–sulfur batteries: understanding, fabrication, and modification

Zhou

et al. 2022

Phys. Chem. Chem. Phys.

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Anchoring Mo2C nanoparticles on vertical graphene nanosheets as a highly efficient catalytic interlayer for Li-S batteries

Cited by 37 publications

References 61 publications

Synergistic Adsorption-Electrocatalysis of Mo–MoB Heterostructures for Lithium–Sulfur Batteries

Synergistic Adsorption-Electrocatalysis of Mo–MoB Heterostructures for Lithium–Sulfur Batteries

Understanding the Catalytic Kinetics of Polysulfide Redox Reactions on Transition Metal Compounds in Li–S Batteries

Advanced cathodic free-standing interlayers for lithium–sulfur batteries: understanding, fabrication, and modification

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