Wang Rui, Wu Songping, Lv Yichao, Lin Zhiqun
School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510641, China.
Langmuir. 2014 Jul 15;30(27):8215-20. doi: 10.1021/la501830r. Epub 2014 Jun 30.
Zn2GeO4 nanorod/graphene composites (ZGCs) were yielded by a two-step hydrothermal processing. Crystalline and amorphous regions were found to coexist in a single Zn2GeO4 nanorod. The surface of the Zn2GeO4 nanorod was compactly covered and anchored by graphene sheets. The ZGCs were then utilized as anodes for lithium ion batteries (LIBs). Intriguingly, partially crystalline ZGC containing 10.2 wt % graphene possessed excellent electrochemical performance, namely, high reversible capacity (1020 mA h g(-1) in the first cycle), favorable cyclic performance (768 mA h g(-1) after 50 cycles), and commendable rate capability (780 mA h g(-1) at the current density of 0.8A g(-1)). The amorphous region in partially crystalline Zn2GeO4 nanorods and the elastic graphene sheets provided the accommodation of volume change during the charge and discharge processes. These advantageous attributes make ZGCs the potential anode materials for LIBs.
通过两步水热法制备了Zn2GeO4纳米棒/石墨烯复合材料（ZGCs）。发现单晶Zn2GeO4纳米棒中同时存在结晶区和非晶区。Zn2GeO4纳米棒的表面被石墨烯片紧密覆盖并锚定。然后将ZGCs用作锂离子电池（LIBs）的阳极。有趣的是，含有10.2 wt%石墨烯的部分结晶ZGC具有优异的电化学性能，即高可逆容量（首次循环中为1020 mA h g(-1)）、良好的循环性能（50次循环后为768 mA h g(-1)）和值得称赞的倍率性能（在0.8A g(-1)的电流密度下为780 mA h g(-1)）。部分结晶的Zn2GeO4纳米棒中的非晶区和弹性石墨烯片为充放电过程中的体积变化提供了容纳空间。这些有利特性使ZGCs成为LIBs潜在的阳极材料。
