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首页> 外文期刊>Advanced Functional Materials >Germanium Nanograin Decoration on Carbon Shell: Boosting Lithium-Storage Properties of Silicon Nanoparticles
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Germanium Nanograin Decoration on Carbon Shell: Boosting Lithium-Storage Properties of Silicon Nanoparticles

机译：碳壳上的锗纳米颗粒装饰：增强硅纳米颗粒的锂存储性能。

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摘要

A novel heterostructured Si@C@Ge anode is developed via a two-step sol-gel method. A facile and straightforward Ge decoration significantly boosts the Li-storage performance of core-shell Si@C nanoparticles on both mechanics and kinetics. The Si@C@Ge anode shows unprecedented electrochemical performance in terms of accessible capacity, cycling stability, and rate capability when compared to those of a core-shell Si@C anode. Based on the experimental results and analysis of the mechanism, it is evident that high-conductivity Ge nanograins on the surface facilitates the Li diffusivity and electron transport and guarantees high ion accessibility. Moreover, it is the Ge nanograins that serve as buffering cushion to tolerate the mechanic strain distribution on the electrode during lithiation/ delithiation processes.
机译：通过两步溶胶-凝胶法开发了一种新型的异质结构Si @ C @ Ge阳极。简便而直接的Ge装饰大大提高了核壳Si @ C纳米粒子在力学和动力学方面的锂存储性能。与核壳型Si @ C阳极相比，Si @ C @ Ge阳极在可及容量，循环稳定性和倍率性能方面显示出前所未有的电化学性能。根据实验结果和机理分析，很明显，表面上的高导电性Ge纳米颗粒促进了Li的扩散性和电子传输，并保证了较高的离子可及性。此外，Ge纳米颗粒充当缓冲垫，可在锂化/脱锂过程中耐受电极上的机械应变分布。

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  • 来源
    《Advanced Functional Materials》 |2016年第43期|7800-7806|共7页
  • 作者

    Luo Wei; Shen Dengke; Zhang Renyuan; Zhang Binwei; Wang Yunxiao; Dou Shi Xue; Liu Hua Kun; Yang Jianping;

  • 作者单位

    Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China;

    Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60204 USA;

    Tongji Univ, Minist Educ, Key Lab Adv Civil Engn Mat, Sch Mat Sci & Engn, Shanghai 200092, Peoples R China;

    Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Innovation Campus Squires Way, Wollongong, NSW 2500, Australia;

    Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Innovation Campus Squires Way, Wollongong, NSW 2500, Australia;

    Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Innovation Campus Squires Way, Wollongong, NSW 2500, Australia;

    Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Innovation Campus Squires Way, Wollongong, NSW 2500, Australia;

    Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China|Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Innovation Campus Squires Way, Wollongong, NSW 2500, Australia;

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