Enhanced electrochemical properties of graphene-wrapped ZnMn2O4 nanorods for lithium-ion batteries
Enhanced electrochemical properties of graphene-wrapped ZnMn2O4 nanorods for lithium-ion batteries
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DOI：
10.1039/c3ta13511j
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发表时间：
2014
影响因子：
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通讯作者：
Zongmin Zheng;Yongliang Cheng;Xingbin Yan;Rutao Wang;Peng Zhang
中科院分区：
文献类型：
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作者：
Zongmin Zheng;Yongliang Cheng;Xingbin Yan;Rutao Wang;Peng Zhang
热还原氧化石墨烯（rGO）包裹的ZnMn 2 O 4纳米棒已成功地通过一个简单的自下而上的方法制造。表征结果表明，多孔ZnMn 2 O 4纳米棒均匀地被ZnO薄膜包裹。这种rGO-ZnMn 2 O 4复合材料的独特结构可以促进离子和电子的扩散，从而为高性能锂离子电池提供合适的负极材料特性。具体而言，导电rGO片可以作为一个有效的缓冲，以放松从Li+插入/提取的体积变化，并使ZnMn 2 O 4晶体的结构和界面稳定。因此，使用该复合材料实现了高且稳定的可逆容量（在100 mA g-1下，在50次循环中为707 mA h g-1）和优异的倍率性能（在2000 mA g-1下为440 mA h g-1）。
Thermally reduced graphene oxide (rGO)-wrapped ZnMn2O4 nanorods have been successfully fabricated via a facile bottom-up approach. Characterization results show that porous ZnMn2O4 nanorods are uniformly wrapped by ultrathin rGO sheets. The unique structure of this rGO–ZnMn2O4 composite could facilitate both ion and electron diffusion, thus providing suitable characteristics of an anode material for high performance lithium-ion batteries. Specifically, the conductive rGO sheets could act as an efficient buffer to relax the volume changes from Li+ insertion/extraction, and enable the structural and interfacial stabilization of ZnMn2O4 crystals. As a consequence, a high and stable reversible capacity (707 mA h g−1 at 100 mA g−1 over 50 cycles) and an excellent rate capability (440 mA h g−1 at 2000 mA g−1) are achieved with this composite material.