Li Yong, Ye Daixin, Shi Bin, Liu Wen, Guo Rui, Pei Haijuan, Xie Jingying
State Key Laboratory of Space Power-Sources Technology, Shanghai Institute of Space Power Sources, Shanghai, 200245, China.
Department of Chemistry and Molecular Biology, University of Gothenburg, S-41296, Gothenburg, Sweden.
Phys Chem Chem Phys. 2017 Mar 15;19(11):7498-7505. doi: 10.1039/c6cp07784f.
To solve the barriers of poor rate capability and inferior cycling stability for the MnO anode in lithium ion batteries, we present a highly flexible membrane anode employing two-dimensional (2D) reduced graphene oxide sheets (rGO) and a three-dimensional (3D) MnO-reduced graphene oxide-carbon nanotube nanocomposite (MGC) by a vacuum filtration and thermal annealing approach. All the components in the 2D/3D thin film anode have a synergistic effect on the improved performance. The initial discharge specific capacity of the electrode with the MnO content of 56 wt% was 1656.8 mA h g and remains 1172.5 mA h g after 100 cycles at a density of 100 mA g. On enhancing the density to 200 mA g, the membrane-electrode still exhibits a large reversible discharging capacity of ∼948.9 mA h g after 300 cycles. Moreover, the flexible Li-ion battery with a large area also shows excellent electrochemical performance in different bending positions, which provides the potential for wearable energy storage devices.
为了解决锂离子电池中MnO负极倍率性能差和循环稳定性不佳的问题，我们通过真空过滤和热退火方法，制备了一种采用二维（2D）还原氧化石墨烯片（rGO）和三维（3D）MnO-还原氧化石墨烯-碳纳米管纳米复合材料（MGC）的高柔韧性薄膜负极。二维/三维薄膜负极中的所有组分对性能提升具有协同作用。MnO含量为56 wt%的电极初始放电比容量为1656.8 mA h g，在100 mA g的电流密度下循环100次后仍保持1172.5 mA h g。当电流密度提高到200 mA g时，薄膜电极在300次循环后仍表现出约948.9 mA h g的大可逆放电容量。此外，大面积的柔性锂离子电池在不同弯曲位置也展现出优异的电化学性能，这为可穿戴储能设备提供了潜力。
