Wang Junyong, Deng Qinglin, Li Mengjiao, Wu Cong, Jiang Kai, Hu Zhigao, Chu Junhao
Key Laboratory of Polar Materials and Devices (MOE) and Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China.
Nanotechnology. 2018 Aug 3;29(31):315403. doi: 10.1088/1361-6528/aac44c. Epub 2018 May 14.
To overcome inferior rate capability and cycle stability of MnO-based anode materials for lithium-ion batteries (LIBs), we reported a novel 3D porous MnO@GS/CNT composite, consisting of MnO nanoparticles homogeneously distributed on the conductive interconnected framework based on 2D graphene sheets (GS) and 1D carbon nanotubes (CNTs). The distinctive architecture offers highly interpenetrated network along with efficient porous channels for fast electron transfer and ionic diffusion as well as abundant stress buffer space to accommodate the volume expansion of the MnO nanoparticles. The MnO@GS/CNT anode exhibits an ultrahigh capacity of 1115 mAh g at 0.2 A g after 150 cycles and outstanding rate capacity of 306 mAh g at 10.0 A g. Moreover, a stable capacity of 405 mAh g after 3200 cycles can still be achieved, even at a large current density of 5.0 A g. When coupled with LiMnO (LMO) cathode, the LMO [Formula: see text] MnO@GS/CNT full cell characterizes an excellent cycling stability and rate capability, indicating the promising application of MnO@GS/CNT anode in the next-generation LIBs.
为克服锂离子电池（LIBs）中MnO基负极材料较差的倍率性能和循环稳定性，我们报道了一种新型的3D多孔MnO@GS/CNT复合材料，它由均匀分布在基于二维石墨烯片（GS）和一维碳纳米管（CNT）的导电互连框架上的MnO纳米颗粒组成。这种独特的结构提供了高度互穿的网络以及高效的多孔通道，用于快速电子转移和离子扩散，还有丰富的应力缓冲空间来适应MnO纳米颗粒的体积膨胀。MnO@GS/CNT负极在150次循环后，在0.2 A g电流密度下展现出1115 mAh g的超高容量，在10.0 A g电流密度下具有306 mAh g的出色倍率性能。此外，即使在5.0 A g的大电流密度下，经过3200次循环后仍可实现405 mAh g的稳定容量。当与LiMnO（LMO）正极耦合时，LMO||MnO@GS/CNT全电池表现出优异的循环稳定性和倍率性能，表明MnO@GS/CNT负极在下一代LIBs中具有广阔的应用前景。
