Accordion Frameworks Enable Free-Standing,High Si Content Anode for Li-ion Batteries

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外文摘要：Implementing high-performance silicon(Si)anode in actual processing and application is highly desirable for next-generation,high-energy Li-ion batteries.However,high content of inactive matrix(including conductive agent and binder)is often indispensable in order to ensure local conductivity and suppress pulverization tendency of Si particles,which thus cause great capacity loss based on the mass of whole electrode.Here,we designed an accordion-structured,high-performance electrode with high Si content up to 95％.Si nanoparticles were well anchored into the interlayer spacings of accordion-like graphene arrays,and free-standing electrode was prepared via a simple filtration process without any binder.Conductive accordion framework ensures strong confinement effect of Si nanoparticles and also provides direct,non-tortuous channels for fast electrochemical reaction kinetics.As a consequence,the accordion Si electrodes exhibit ultrahigh,electrode-based capacities up to 3149 mAh g-1(under Si content of 91％),as well as long-term stability.Also,the accordion electrode can bear extreme condition of over-lithiation and maintains stable in full-cell test.This design provides a significant stride in high Si content toward realistic,high-performance electrodes.

外文关键词：

accordionanodefree-standinghigh Si contenthigh-performance

作者：

Zedong Zhao、Lei Dong、Qin Huang、Tianqi Wu、Fugang Zhao、Yixuan Guo、Bo Hu、Yuanhang Ge、Jiajia Zhang、Keyu Xie、Hongbin Lu

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作者单位：

State Key Laboratory of Molecular Engineering of Polymers,Collaborative Innovation Center of Polymers & Polymer Composites,Department of Macromolecular Science,Fudan University,Shanghai 200438,China

State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China

State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene NPU),Xi'an 710072,China

Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province,Department of Chemistry,Zhejiang Sci-Tech University,Hangzhou 310018,China

Yiwu Research Institute of Fudan University,Yiwu 322000,China

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基金：

Shaanxi Yanchang Petroleum CO.,LtdYiwu Research Institute of Fudan University国家自然科学基金Shanghai International Collaboration Research Project

项目编号：

18529215572207504819520713900

出版年：

2023

DOI：

10.1002/eem2.12400

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(5)

参考文献量56