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GeO_2 Encapsulated Ge Nanostructure with Enhanced Lithium-Storage Properties

机译：具有增强的锂存储特性的GeO_2封装的Ge纳米结构

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摘要

Germanium (Ge)-based nanostructures, especially those with germanium dioxide (GeO2), have drawn great interest for applications in lithium (Li)-ion batteries due to their ultrahigh theoretical Li+ storage capability (8.4 Li/Ge). However, GeO2 in conventional Ge(s)/GeO2(c) (where (c) means the core and (s) means the shell) composite anodes with Ge shell outside GeO2 undergoes an irreversible conversion reaction, which restricts the maximum capacity of such batteries to 1126 mAhg(-1) (the equivalent of storing 4.4 Li+). In this work, a porous GeO2(s)/Ge(c) nanostructure with GeO2 shell outside Ge cores are successfully fabricated utilizing the Kirkendall effect and used as a lithium-ion battery anode, giving a substantially improved capacity of 1333.5 mAhg(-1) at a current density of 0.1 Ag-1 after 30 cycles and a stable long-time cycle performance after 100 cycles at a current density of 0.5 A g(-1). The enhanced battery performance is attributed to the improved reversibility of GeO2 lithiation/delithiation processes catalyzed by Ge in the properly structured porous GeO2(s)/Ge(c) nanostructure.
机译：基于锗（Ge）的纳米结构，尤其是具有二氧化锗（GeO2）的纳米结构，由于其极高的理论Li +储存能力（8.4 Li / Ge），引起了锂（Li）离子电池应用的极大兴趣。然而，常规Ge（s）/ GeO2（c）中的GeO2（其中（c）表示核，（s）表示壳）在GeO2外部带有Ge壳层的复合阳极经历不可逆的转化反应，这限制了这种材料的最大容量。电池达到1126 mAhg（-1）（相当于存储4.4 Li +）。在这项工作中，利用柯肯德尔效应成功地制造了具有在Ge核外部的GeO2壳的多孔GeO2 / s / Ge（c）纳米结构，并用作锂离子电池阳极，从而显着提高了1333.5 mAhg（-1）的容量。 ）在30个循环后电流密度为0.1 Ag-1时，在0.5 A g（-1）电流密度下经过100个循环后具有稳定的长时间循环性能。电池性能的提高归因于在适当结构化的多孔GeO2 / Ge（c）纳米结构中Ge催化的GeO2锂化/去锂化过程的可逆性提高。

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  • 来源
    《Advanced Functional Materials》 |2019年第8期|1807946.1-1807946.7|共7页
  • 作者

    Yan Shancheng; Song Haizeng; Lin Shuren; Wu Han; Shi Yi; Yao Jie;

  • 作者单位

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA|Nanjing Univ Posts & Telecommun, Sch Geog & Biol Informat, Nanjing 210023, Jiangsu, Peoples R China|Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA|Nanjing Univ Posts & Telecommun, Sch Geog & Biol Informat, Nanjing 210023, Jiangsu, Peoples R China|Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA|Nanjing Univ Posts & Telecommun, Sch Geog & Biol Informat, Nanjing 210023, Jiangsu, Peoples R China|Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA|Nanjing Univ Posts & Telecommun, Sch Geog & Biol Informat, Nanjing 210023, Jiangsu, Peoples R China|Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA|Nanjing Univ Posts & Telecommun, Sch Geog & Biol Informat, Nanjing 210023, Jiangsu, Peoples R China|Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA|Nanjing Univ Posts & Telecommun, Sch Geog & Biol Informat, Nanjing 210023, Jiangsu, Peoples R China|Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

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  • 关键词

    Kirkendall effect; lithium ion batteries; nanostructures; porous GeO2(s)/Ge(c);

    机译：柯肯德尔效应;锂离子电池;纳米结构;多孔GeO2 / Ge（c）;

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