School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an 710021, People's Republic of China.
Nanotechnology. 2019 Aug 2;30(31):315602. doi: 10.1088/1361-6528/ab19e0. Epub 2019 Apr 16.
Two-dimensional (2D) materials have been widely studied and used as anode materials for lithium ion batteries (LIBs) because of their high specific surface area and intrinsic mechanical flexibility which could offer numerous active sites and protect effect for LIBs. However, 2D nanosheets are easy to stack and partially lose surface area for Li-ion storage thus greatly affecting their electrochemical performance. Here, we develop a simple strategy to obtain a nanosheets-based one-dimensional structure hybrid by in situ reduction from MoO nanorods to MoO nanosheets and nanoparticles which are anchored on a 1D reduced graphene oxide skeleton (MoO-rGO). It was demonstrated that the primary MoO nanosheets and nanoparticles are uniformly dispersed on the reduced graphene oxide nanosheets, which are further assembled into a 1D loosened nanostructure. The loosened nanosheets offer more accessible surface area and facilitate transport of electrons and Li-ions. Moreover, MoO nanoparticles effectively avoid agglomeration from nanosheets. Results show that MoO-rGO hybrid demonstrates an enhanced cyclic life, high stability and prominent rate performance when evaluated as anode material for LIBs. The first discharge capacity can reach 1256.4 mAh g and provide a highly reversible capacity of 1003.7 mA h g after 100 cycles at 0.1 A g, which makes MoO-rGO a promising candidate for LIBs. The excellent performance can be attributed to the unique 1D loosened structure consists of MoO and conducting rGO nanosheets, which facilitates fast transfer of Li-ion and electron, and the reduced graphene oxide nanosheets acting as a skeleton provide a continuous conductive network and simultaneously strengthen the structural stability.
二维（2D）材料因其高比表面积和固有机械柔韧性而被广泛研究并用作锂离子电池（LIB）的阳极材料，这可为 LIB 提供众多的活性位点和保护作用。然而，2D 纳米片易于堆叠，部分失去了用于 Li 离子存储的表面积，从而极大地影响了它们的电化学性能。在这里，我们开发了一种简单的策略，通过从 MoO 纳米棒原位还原为 MoO 纳米片和纳米颗粒，并将其锚定在一维还原氧化石墨烯骨架（MoO-rGO）上来获得基于纳米片的一维结构混合体。结果表明，主要的 MoO 纳米片和纳米颗粒均匀分散在还原氧化石墨烯纳米片上，进一步组装成一维疏松的纳米结构。疏松的纳米片提供了更多的可及表面积，并有利于电子和 Li 离子的传输。此外，MoO 纳米颗粒有效地避免了纳米片的团聚。结果表明，作为 LIB 阳极材料，MoO-rGO 混合体表现出增强的循环寿命、高稳定性和突出的倍率性能。在 0.1 A g 下 100 次循环后，首次放电容量可达到 1256.4 mAh g，提供了高达 1003.7 mA h g 的高可逆容量，这使得 MoO-rGO 成为 LIB 的有前途的候选材料。优异的性能可归因于由 MoO 和导电 rGO 纳米片组成的独特的 1D 疏松结构，这有利于 Li 离子和电子的快速转移，而还原氧化石墨烯纳米片作为骨架提供了连续的导电网络，同时增强了结构稳定性。
