Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, People's Republic of China. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
Nanotechnology. 2019 May 3;30(18):184003. doi: 10.1088/1361-6528/aafec3. Epub 2019 Jan 15.
Transition metal oxides (TMOs) are widely accepted as one of the alternatives for the graphite anode in lithium-ion batteries (LIBs) owing to the high specific capacity and facile synthesis of nanoscale materials facilitating fast ionic transfer. However, the lower electronic conductivity always impedes the application of TMOs. Herein, we report a graphene oxide wrapped layer-structured CuVO(OH) · 2HO nanocomposite (CVO/GO) synthesized via an in situ co-precipitation method. It is corroborated that the introduction of GO not only provides more active sites for lithium-ion storage, but also improves the charge transfer rate of the electrode, issuing an enhanced electrochemical performance. As expected, the CVO/GO nanocomposite exhibits an ultrahigh specific capacity of 870 mA h g at 0.1 A g compared with CVO nanoparticles. Even at a high current density of 5 A g, a specific capacity of 158 mA h g could be achieved for the CVO/GO nanocomposite.
过渡金属氧化物（TMOs）由于具有高比容量和易于合成纳米材料的特点，有利于快速离子转移，被广泛认为是锂离子电池（LIBs）中石墨阳极的替代品之一。然而，较低的电子电导率总是阻碍了 TMOs 的应用。在此，我们通过原位共沉淀法报告了一种氧化石墨烯包裹的层状 CuVO(OH)·2HO 纳米复合材料（CVO/GO）的合成。研究证实，GO 的引入不仅为锂离子存储提供了更多的活性位点，而且提高了电极的电荷转移速率，从而提高了电化学性能。不出所料，与 CVO 纳米颗粒相比，CVO/GO 纳米复合材料在 0.1 A g 的电流密度下表现出超高的比容量 870 mA h g。即使在 5 A g 的高电流密度下，CVO/GO 纳米复合材料也可实现 158 mA h g 的比容量。
