The acupuncture effect of carbon nanotubes induced by the volume expansion of silicon-based anodes

He, Ziying; Zhang, Chenxi; Zhu, Yukang; Wei, Fei

doi:10.1039/d4ee00710g

Cited by 4 publications

(3 citation statements)

References 47 publications

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“…(Figure 1g, Table S2). 26 Combined with the above electrochemical analysis, it can be concluded that the addition of SWCNT can not only promote the reaction kinetics of the SiO-based electrode but also stabilize the interface and achieve long cycling life.…”

Section: Resultsmentioning

confidence: 80%

“…Thanks to the outstanding mechanical and conductive properties, carbon nanotubes (including single-walled and multiwalled carbon nanotubes, SWCNT and MWCNT) are demonstrated as one type of near-perfect additive for further enhancing the application of Si-based anode materials. − For example, Wei et al revealed that SWCNT could maintain the complete conductive/structural networks even under tensile stresses up to 6.2 GPa for SiO@C . Recently, they further found that the longer and slender SW/MW-CNTs additives exhibited a limited acupuncture effect caused by SiO x volume-change-induced compressive stress during the cycling process.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, they further found that the longer and slender SW/MW-CNTs additives exhibited a limited acupuncture effect caused by SiO x volume-change-induced compressive stress during the cycling process. That is, the integrity of the solid electrolyte interface (SEI) film and carbon coating layer on the SiO x , as well as the interfacial Li + diffusion rate, could be well kept . Besides, Sang-Hoon Park designed a segregated SWCNT networks with high conductivity for thick Si-based electrodes, displaying very high areal capacities of 45 mAh cm –2 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Beyond Mechanical Protection: The Electron-Shielding Effect of SWCNT for the Stabilized SiO Interface

Fang,

Kong,

et al. 2024

ACS Appl. Mater. Interfaces

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The single-walled carbon nanotube (SWCNT) commonly serves as a conductive additive for SiO-based anode materials due to the excellent conductivity and mechanical properties. However, the potential action mechanisms for the SWCNT beyond conductivity and mechanical features have rarely been studied. Herein, an interfacial electron-shielding effect and preferential adsorption to the electrolyte components for the SWCNT are revealed through a series of advanced characterizations and density functional theory (DFT) simulations. It can be determined that SWCNT networks could restrict the transmission of the electron from SiO interface to electrolyte with the reduced decomposition, because of the typical axial conductivity of the SWCNT. Moreover, the SWCNT shows stronger adsorption energy for LiPF 6 and ethylene carbonate (EC) molecules, rather than nonselectivity of traditional carbon additives, facilitating the generation of inorganic-rich and denser solid electrolyte interface (SEI) film. As a result, benefiting from the electron-shielding effect, preferential adsorption, and mechanical protection, the SWCNT endows the SiO@C anode with a higher average Coulombic efficiency (CE) value of 99.4% over 100 cycles and a long cycling stability.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Beyond Mechanical Protection: The Electron-Shielding Effect of SWCNT for the Stabilized SiO Interface

Fang,

Kong,

et al. 2024

ACS Appl. Mater. Interfaces

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Advances in Carbon Nanotubes and Carbon Coatings as Conductive Networks in Silicon‐based Anodes

He,

Zhang,

Zhu

et al. 2024

Adv Funct Materials

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Silicon‐based anode has high theoretical capacity but suffers from poor electrical conductivity, large volume expansion, and unstable solid electrolyte interphase (SEI). Adding carbon nanotubes (CNTs) and carbon coatings are both very effective methods for addressing the above issues. The intrinsic sp2 covalent structure endows CNTs with excellent electrical conductivity, mechanical strength, and chemical stability, which makes them suitable for various energy storage applications, such as in lithium‐ion batteries (LIBs). Apart from the conductive network, CNTs can serve as current collectors, mechanical probes, and mechanical frameworks, and they have potential in the construction of next‐generation battery architectures. Carbon coatings are mixed ionic‐electronic conductors with good chemical stability that provide mechanical support and mitigate the volume expansion of Si‐based materials. This review outlines the advances in CNTs and carbon coatings as conductive networks in Si‐based anodes, as well as insights into their future development. It provides an in‐depth analysis of the percolation and mechanical mechanism of conductive networks, highlights the importance of flexible long‐range conductivity, and decouples the relationships between stress, interface stability, and electron/ion transfer.

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A like-bulletproof glass structure flexibility-rigidity coating layer strategy for high-performance Li ion batteries Si anodes

Wang,

Hao,

Yang

et al. 2024

International Journal of Hydrogen Energy

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The acupuncture effect of carbon nanotubes induced by the volume expansion of silicon-based anodes

Abstract: The cyclic instability of Si-based anodes can be effectively alleviated by adding carbon nanotube (CNT) networks. However, the ion diffusion and electrochemical performance vary greatly depending on the type of...

Cited by 4 publications

References 47 publications

Beyond Mechanical Protection: The Electron-Shielding Effect of SWCNT for the Stabilized SiO Interface

Beyond Mechanical Protection: The Electron-Shielding Effect of SWCNT for the Stabilized SiO Interface

Advances in Carbon Nanotubes and Carbon Coatings as Conductive Networks in Silicon‐based Anodes

A like-bulletproof glass structure flexibility-rigidity coating layer strategy for high-performance Li ion batteries Si anodes

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