Sb particles embedded in N-doped carbon spheres wrapped by graphene for superior K+−Storing performances

Qian, Kun; Mu, Zongyong; Wang, Xin; Zhang, Yaqi; Zhu, Mingzhang; Zhang, Chao-Zhi; Li, Jingfa

doi:10.1016/j.ceramint.2022.09.311

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…16 The subsequent anodic scan shows a strong peak at 0.76 V and a weak peak at 1.25 V, indicating the depotassiation process from K 3 Sb to amorphous K x Sb and then to Sb. 35 The anodic/ cathodic peaks overlap well in the subsequent cycles, suggesting the excellent electrochemical reversibility. 15,28 This demonstrates that stable Sb−N covalent bonds of Sb@CTF-NC inherited from the Sb 2 S 3 @CTF precursor can alleviate the pressure of Sb expansion, resulting quickly in kinetic equilibrium.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

“…There are two distinct potassiation peaks at 0.47 and 0.11 V after the second potential sweep; the former is ascribed to the reaction between metallic Sb and K + ions to form K x Sb (0 < x < 3) while the latter can be ascribed to the conversion of K x Sb into K 3 Sb . The subsequent anodic scan shows a strong peak at 0.76 V and a weak peak at 1.25 V, indicating the depotassiation process from K 3 Sb to amorphous K x Sb and then to Sb . The anodic/cathodic peaks overlap well in the subsequent cycles, suggesting the excellent electrochemical reversibility. , This demonstrates that stable Sb–N covalent bonds of Sb@CTF-NC inherited from the Sb 2 S 3 @CTF precursor can alleviate the pressure of Sb expansion, resulting quickly in kinetic equilibrium.…”

Section: Resultsmentioning

confidence: 97%

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Analogous Chelation to Boost Utilization of Sb in Sb Nanoparticles and N-doped Carbon Composites for Enhancing Potassium Storage

Zhang,

Xue,

Otitoju

et al. 2024

ACS Appl. Mater. Interfaces

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Antimony (Sb) is an attractive anode material for potassium-ion batteries (PIBs), but it suffers from aggregation during the charging−discharging process, thus causing embedded active sites and collapsed structure. The analogous chelation refers to the reaction in which the central nanoparticle is linked to the matrix through multiple coordination bonds to form a stable composite. This strategy can inhibit aggregation and maintain the nanosized structure of Sb, thus activating the utilization of Sb active sites and structural stability. Given the special position of nitrogen (N) in the periodic table of elements and the strong bond energy of Sb−N, the N element can serve as an intermediate to connect Sb nanoparticles and an intrinsic N-doped carbon network via strong Sb−N−C/Sb−N�C covalent bonds using analogous chelation. Herein, a hybrid material of Sb@CTF-NC is fabricated via analogous chelation. The Sb atoms exposed on the surface of Sb nanoparticles are used to chelate with the N-doped carbon for high-performance PIBs. The mechanism underwent ex situ characterizations. The calculation of density functional theory reveals that the increase of adsorption energy and reduction of the K + diffusion barrier accelerate the electrochemical reaction kinetics.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Analogous Chelation to Boost Utilization of Sb in Sb Nanoparticles and N-doped Carbon Composites for Enhancing Potassium Storage

Zhang,

Xue,

Otitoju

et al. 2024

ACS Appl. Mater. Interfaces

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“…16,[359][360][361][362][363][364] These elements can form K-M binary intermetallic compounds after alloying or dealloying reactions with potassium. 16,361,[365][366][367] This alloying reaction has very high theoretical capacity, but during the reaction process, the electrode material expands significantly in size and becomes pulverized, leading to severe capacity degradation and poor cyclability. [368][369][370] Organic compounds used for the anode electrode operate under the same potassium storage mechanism as the cathode electrode, except that the voltage is relatively lower.…”

Section: Anode Materialsmentioning

confidence: 99%

Recent advances in rational design for high-performance potassium-ion batteries

Xu,

Du,

Chen

et al. 2024

Chem. Soc. Rev.

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“…Unfortunately, during the sodiation/desodiation process, the volume of Bi and Sb significantly varies. This leads to severe pulverization and capacity decline, posing major challenges to Bi and Sb [ 18 , 19 ]. In recent years, bimetallic alloys have received much attention as a feasible strategy.…”

Section: Introductionmentioning

confidence: 99%

Bismuth-Antimony Alloy Nanoparticles Embedded in 3D Hierarchical Porous Carbon Skeleton Film for Superior Sodium Storage

Wang,

Lin,

et al. 2023

Molecules

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A composite film that features bismuth–antimony alloy nanoparticles uniformly embedded in a 3D hierarchical porous carbon skeleton is synthesized by the polyacrylonitrile-spreading method. The dissolved polystyrene is used as a soft template. The average diameter of the bismuth–antimony alloy nanoparticles is ~34.5 nm. The content of the Bi-Sb alloy has an impact on the electrochemical performance of the composite film. When the content of the bismuth–antimony alloy is 45.27%, the reversible capacity and cycling stability of the composite film are the best. Importantly, the composite film outperforms the bismuth–antimony alloy nanoparticles embedded in dense carbon film and the cube carbon nanobox in terms of specific capacity, cycling stability, and rate capability. The composite film can provide a discharge capacity of 322 mAh g−1 after 500 cycles at 0.5 A g−1, 292 mAh g−1 after 500 cycles at 1 A g−1, and 185 mAh g−1 after 2000 cycles at 10 A g−1. The carbon film prepared by the spreading method presents a unique integrated composite structure that significantly improves the structural stability and electronic conductivity of Bi-Sb alloy nanoparticles. The 3D hierarchical porous carbon skeleton structure further enhances electrolyte accessibility, promotes Na+ transport, increases reaction kinetics, and buffers internal stress.

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Sb particles embedded in N-doped carbon spheres wrapped by graphene for superior K+−Storing performances

Cited by 8 publications

References 43 publications

Analogous Chelation to Boost Utilization of Sb in Sb Nanoparticles and N-doped Carbon Composites for Enhancing Potassium Storage

Analogous Chelation to Boost Utilization of Sb in Sb Nanoparticles and N-doped Carbon Composites for Enhancing Potassium Storage

Recent advances in rational design for high-performance potassium-ion batteries

Bismuth-Antimony Alloy Nanoparticles Embedded in 3D Hierarchical Porous Carbon Skeleton Film for Superior Sodium Storage

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