Volume 17, Issue 40 2102316
Research Article

Constructing a Reinforced and Gradient Solid Electrolyte Interphase on Si Nanoparticles by In-Situ Thiol-Ene Click Reaction for Long Cycling Lithium-Ion Batteries

Liang Zhao

Liang Zhao

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Danfeng Zhang

Danfeng Zhang

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Yongfeng Huang

Yongfeng Huang

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Kui Lin

Kui Lin

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Likun Chen

Likun Chen

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Wei Lv

Wei Lv

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

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Yan-Bing He

Corresponding Author

Yan-Bing He

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

E-mail: [email protected]; [email protected]

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Feiyu Kang

Corresponding Author

Feiyu Kang

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 P. R. China

E-mail: [email protected]; [email protected]

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First published: 07 September 2021
Citations: 22

Abstract

Constructing a stable solid electrolyte interphase (SEI) on high-specific-capacity silicon (Si) anode is one of the most effective methods to reduce the crack of SEI and improve the cycling performance of Si anode. Herein, the authors construct a reinforced and gradient SEI on Si nanoparticles by an in-situ thiol-ene click reaction. Mercaptopropyl trimethoxysilane (MPTMS) with thiol functional groups (SH) is first grafted on the Si nanoparticles through condensation reaction, which then in-situ covalently bonds with vinylene carbonate (VC) to form a reinforced and uniform SEI on Si nanoparticles. The modified SEI with sufficient elastic LixSiOy can homogenize the stress and strain during the lithiation of Si nanoparticles to reduce their expansion and prevent the SEI from cracking. The Si nanoparticles-graphite blending anode with the reinforced SEI exhibits excellent performance with an initial coulombic efficiency of ≈90%, a capacity of 1053.3 mA h g−1 after 500 cycles and a high capacity of 852.8 mA h g−1 even at a high current density of 3 A g−1. Moreover, the obtained anode shows superior cycling stability under both high loadings and lean electrolyte. The in-situ thiol-ene click reaction is a practical method to construct reinforced SEI on Si nanoparticles for next-generation high-energy-density lithium-ion batteries.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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