Oxygen vacancies engineering in hollow and porous MnCo2O4 nanoflowers-coated separators for advanced Li-S batteries

Wu, Liping; Hu, Yuxin; Chen, Zihe; Cai, Chuyue; Cai, Chen; Mei, Tao; Lin, Liangyou; Wang, Xianbao

doi:10.1016/j.electacta.2022.141185

Cited by 6 publications

(4 citation statements)

References 45 publications

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“…Wang et al synthesized a hollow spinel-type MnCo 2 O 4 nanoflower with excellent electrochemical performance. 22 The compound ZnCo 2 O 4 is a typical ternary spinel oxide with a structurally stable framework and diverse physical properties. In the realm of lithium-ion battery materials, it demonstrates exceptional electrochemical characteristics such as reversible capacity, good cycling stability, and environmental benignity.…”

Section: Introductionmentioning

confidence: 99%

“…The Co-based spinel bimetallic structures (such as MCo 2 O 4 ) have been widely studied and utilized due to their high electrocatalytic activity and structural stability. Wang et al synthesized a hollow spinel-type MnCo 2 O 4 nanoflower with excellent electrochemical performance . The compound ZnCo 2 O 4 is a typical ternary spinel oxide with a structurally stable framework and diverse physical properties.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen-Defect-Rich B-ZnCo₂O_4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

Huang,

Qiao,

Wang

et al. 2024

ACS Appl. Nano Mater.

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High specific capacity and long cycle life are the key to high-performance lithium−sulfur (Li−S) batteries, but they are hard to achieve simultaneously due to the notorious polysulfide shuttle effect. Transition metal oxide nanocatalysts are expected to help address the above issue, but their low conductivity and cumbersome synthesis process limit their application. Here, we propose a defect engineering strategy to induce electron rearrangement by heteroatom doping. Boron-doped spinel-type oxide (B-ZnCo 2 O 4-x ) is synthesized by a two-step hydrothermal method for separator modification. The boron-produced oxygen vacancy (O V ) increases unsaturated sites by changing the electron cloud density, and therefore, the B-ZnCo 2 O 4-x nanocatalyst can reduce the reaction energy barrier and accelerate the nucleation and activation rate of Li 2 S. Meanwhile, the unique pore defects effectively increase the Li + flux and ensure battery performance at a high rate and high sulfur loading. The battery equipped with a B-ZnCo 2 O 4-x -modified separator delivered an initial specific capacity of 1108 mAh g −1 at 0.2 C and a capacity retention rate of 80.4% at 0.5 C after 200 cycles. In particular, at a high sulfur loading of 10.0 mg cm −2 , the battery yielded a first-cycle capacity of 1321.9 mAh g −1 . This work demonstrates that boron-doping-enabled defect engineering is an effective strategy to improve the catalytic activity of transition metal oxides for application in Li−S batteries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxygen-Defect-Rich B-ZnCo₂O_4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

Huang,

Qiao,

Wang

et al. 2024

ACS Appl. Nano Mater.

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“…Introducing vacancies into materials is a common defect engineering strategy. , Several studies have been carried out on the catalytic role of anion vacancies. , However, the formation energy of cation vacancy is relatively high, leading to less relevant studies . Ruetschi and Giovanoli first reported the relationship between cation vacancies and charge storage properties in MnO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, currently, research on cation vacancies is mostly based on monomer compounds. Previous investigations have testified that the alloying of transition metals can enable them to have smaller energy band gaps and also maintain higher activity and structural stability on their surfaces. , Meanwhile, compared with monomeric compounds, the synergies between bimetals can yield unique physicochemical properties; consequently, not only do the bimetallic cation vacancies greatly improve the degree of defects but they also improve the catalytic activity of the composite through synergistic catalysis . In addition, when bimetallic cation vacancy compounds are used as hosts in sulfur cathodes alone, they tend to aggregate during the electrochemical reactions, which severely reduces their catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

(Fe_0.5Ni_0.5)_0.96S with Bimetallic Cation Vacancy Defect as an Efficient Catalyst for Regulating the Reaction Kinetics of Li₂S

Guo,

Kuang,

Zhang

et al. 2023

ACS Appl. Energy Mater.

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Cation‐Vacancy Engineering Modulated Perovskite Oxide for Boosting Electrocatalytic Conversion of Polysulfides

Bai,

Wang,

Wang

et al. 2024

Adv Funct Materials

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Lithium‐sulfur batteries face challenges like polysulfide shuttle and slow conversion kinetics, hindering their practical applications in renewable energy storage and electric vehicles. Herein, a solution to solve this issue is reported by using a cation vacancy engineering strategy with rational synthesis of La‐deficient LaCoO3 (LCO‐VLa). The introduction of cation vacancies in LCO‐VLa modifies the geometric structure of coordinating atoms, exposing Co‐rich surface with more catalytically active surfaces. Meanwhile, the d‐band center of LCO‐VLa shifts toward the Fermi level, enhancing polysulfide adsorption. Furthermore, multivalent cobalt ions (Co3+/Co4+) induced by charge compensation enhance the electrical conductivity of LCO‐VLa, accelerating electron transfer processes and improving catalytic performance. Theoretical calculations and experimental characterizations demonstrate that La‐deficient LCO‐VLa effectively suppresses the polysulfide shuttle, reduces the energy barrier for polysulfide conversion, and accelerates redox reaction kinetics. LCO‐VLa‐based batteries demonstrate exceptional rate performance and cycling stability, retaining 70% capacity after nearly 500 cycles at 1.0 C, with a minimal decay rate of 0.055% per cycle. These findings highlight the significance of cation vacancy engineering for exploring precise structure‐activity relationships during polysulfides conversion, facilitating the rational design of catalysts at the atomic level for lithium‐sulfur batteries.

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Oxygen vacancies engineering in hollow and porous MnCo2O4 nanoflowers-coated separators for advanced Li-S batteries

Cited by 6 publications

References 45 publications

Oxygen-Defect-Rich B-ZnCo₂O_4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

Oxygen-Defect-Rich B-ZnCo₂O_4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

(Fe_0.5Ni_0.5)_0.96S with Bimetallic Cation Vacancy Defect as an Efficient Catalyst for Regulating the Reaction Kinetics of Li₂S

Cation‐Vacancy Engineering Modulated Perovskite Oxide for Boosting Electrocatalytic Conversion of Polysulfides

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Oxygen vacancies engineering in hollow and porous MnCo2O4 nanoflowers-coated separators for advanced Li-S batteries

Cited by 6 publications

References 45 publications

Oxygen-Defect-Rich B-ZnCo2O4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

Oxygen-Defect-Rich B-ZnCo2O4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

(Fe0.5Ni0.5)0.96S with Bimetallic Cation Vacancy Defect as an Efficient Catalyst for Regulating the Reaction Kinetics of Li2S

Cation‐Vacancy Engineering Modulated Perovskite Oxide for Boosting Electrocatalytic Conversion of Polysulfides

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Oxygen-Defect-Rich B-ZnCo₂O_4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

Oxygen-Defect-Rich B-ZnCo₂O_4-x Nanocatalyst for Efficient Conversion Kinetics of Lithium–Sulfur Batteries

(Fe_0.5Ni_0.5)_0.96S with Bimetallic Cation Vacancy Defect as an Efficient Catalyst for Regulating the Reaction Kinetics of Li₂S