Defect-Engineered VS2 Electrocatalysts for Lithium-Sulfur Batteries

Li He; Xiaoya Zhang; Di Yang; Jiayu Li; Meiling Wang; Siyu Liu; Jingyi Qiu; Teng Ma; Junjie Ba; Yizhan Wang; Yingjin Wei

doi:10.1021/acs.nanolett.3c01838

Defect-Engineered VS₂ Electrocatalysts for Lithium-Sulfur Batteries

Li He, Xiaoya Zhang, Di Yang, Jiayu Li, Meiling Wang, Siyu Liu, Jingyi Qiu, Teng Ma, Junjie Ba, Yizhan Wang, Yingjin Wei

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Defective two-dimensional transition metal dichalcogenides can be effective electrocatalysts for Li-S batteries, but the relationship between defect types and battery performance is unclear. In this work, we designed S vacancy-type S_V-VS₂ and V self-intercalated-type V_I-VS₂ and measured their catalytic activities in Li-S batteries. Compared with self-intercalating V atoms, S vacancies accelerated Li⁺ diffusion and S_V-VS₂ as a Li⁺ “reservoir” promoted the sulfur conversion kinetics significantly. In addition, the presence of sulfur vacancies promoted the lithiation behavior of S_V-VS₂ during discharge, leading to an enhancement of the catalytic ability of S_V-VS₂. However, this lithiation phenomenon weakened the catalytic activity of V_I-VS₂. Overall, S_V-VS₂ had better adsorption and catalytic activity. Li-S batteries with S_V-VS₂-coated separators delivered high rate performance and excellent cycling stability, with a capacity decay rate of 0.043% over 880 cycles at 1.0 C. This work provides an effective strategy for designing efficient Li-S battery electrocatalysts using defect engineering.

Original language	English
Pages (from-to)	7411-7418
Number of pages	8
Journal	Nano Letters
Volume	23
Issue number	16
DOIs	https://doi.org/10.1021/acs.nanolett.3c01838
State	Published - 23 Aug 2023
Externally published	Yes

Keywords

defects
electrocatalyst
lithium−sulfur battery
shuttling effect
vanadium dichalcogenide

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acs.nanolett.3c01838

Cite this

@article{89cb4e2ada694a4f950bdef460e1fa6e,

title = "Defect-Engineered VS2 Electrocatalysts for Lithium-Sulfur Batteries",

abstract = "Defective two-dimensional transition metal dichalcogenides can be effective electrocatalysts for Li-S batteries, but the relationship between defect types and battery performance is unclear. In this work, we designed S vacancy-type SV-VS2 and V self-intercalated-type VI-VS2 and measured their catalytic activities in Li-S batteries. Compared with self-intercalating V atoms, S vacancies accelerated Li+ diffusion and SV-VS2 as a Li+ “reservoir” promoted the sulfur conversion kinetics significantly. In addition, the presence of sulfur vacancies promoted the lithiation behavior of SV-VS2 during discharge, leading to an enhancement of the catalytic ability of SV-VS2. However, this lithiation phenomenon weakened the catalytic activity of VI-VS2. Overall, SV-VS2 had better adsorption and catalytic activity. Li-S batteries with SV-VS2-coated separators delivered high rate performance and excellent cycling stability, with a capacity decay rate of 0.043% over 880 cycles at 1.0 C. This work provides an effective strategy for designing efficient Li-S battery electrocatalysts using defect engineering.",

keywords = "defects, electrocatalyst, lithium−sulfur battery, shuttling effect, vanadium dichalcogenide",

author = "Li He and Xiaoya Zhang and Di Yang and Jiayu Li and Meiling Wang and Siyu Liu and Jingyi Qiu and Teng Ma and Junjie Ba and Yizhan Wang and Yingjin Wei",

note = "Publisher Copyright: {\textcopyright} 2023 American Chemical Society.",

year = "2023",

month = aug,

day = "23",

doi = "10.1021/acs.nanolett.3c01838",

language = "English",

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journal = "Nano Letters",

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T1 - Defect-Engineered VS2 Electrocatalysts for Lithium-Sulfur Batteries

AU - He, Li

AU - Zhang, Xiaoya

AU - Yang, Di

AU - Li, Jiayu

AU - Wang, Meiling

AU - Liu, Siyu

AU - Qiu, Jingyi

AU - Ma, Teng

AU - Ba, Junjie

AU - Wang, Yizhan

AU - Wei, Yingjin

PY - 2023/8/23

Y1 - 2023/8/23

N2 - Defective two-dimensional transition metal dichalcogenides can be effective electrocatalysts for Li-S batteries, but the relationship between defect types and battery performance is unclear. In this work, we designed S vacancy-type SV-VS2 and V self-intercalated-type VI-VS2 and measured their catalytic activities in Li-S batteries. Compared with self-intercalating V atoms, S vacancies accelerated Li+ diffusion and SV-VS2 as a Li+ “reservoir” promoted the sulfur conversion kinetics significantly. In addition, the presence of sulfur vacancies promoted the lithiation behavior of SV-VS2 during discharge, leading to an enhancement of the catalytic ability of SV-VS2. However, this lithiation phenomenon weakened the catalytic activity of VI-VS2. Overall, SV-VS2 had better adsorption and catalytic activity. Li-S batteries with SV-VS2-coated separators delivered high rate performance and excellent cycling stability, with a capacity decay rate of 0.043% over 880 cycles at 1.0 C. This work provides an effective strategy for designing efficient Li-S battery electrocatalysts using defect engineering.

AB - Defective two-dimensional transition metal dichalcogenides can be effective electrocatalysts for Li-S batteries, but the relationship between defect types and battery performance is unclear. In this work, we designed S vacancy-type SV-VS2 and V self-intercalated-type VI-VS2 and measured their catalytic activities in Li-S batteries. Compared with self-intercalating V atoms, S vacancies accelerated Li+ diffusion and SV-VS2 as a Li+ “reservoir” promoted the sulfur conversion kinetics significantly. In addition, the presence of sulfur vacancies promoted the lithiation behavior of SV-VS2 during discharge, leading to an enhancement of the catalytic ability of SV-VS2. However, this lithiation phenomenon weakened the catalytic activity of VI-VS2. Overall, SV-VS2 had better adsorption and catalytic activity. Li-S batteries with SV-VS2-coated separators delivered high rate performance and excellent cycling stability, with a capacity decay rate of 0.043% over 880 cycles at 1.0 C. This work provides an effective strategy for designing efficient Li-S battery electrocatalysts using defect engineering.

KW - defects

KW - electrocatalyst

KW - lithium−sulfur battery

KW - shuttling effect

KW - vanadium dichalcogenide

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