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, China.
Nanoscale. 2018 Jul 13;10(27):13140-13148. doi: 10.1039/c8nr01835a.
To accommodate huge volume change and boost the inferior electrochemical reaction kinetics of manganous oxide anodes for lithium-ion batteries, a unique 3D porous CNT/graphene-MnO architecture has been synthesized, with MnO nanoparticles homogeneously decorated on 3D interconnected CNT/graphene (3DCG) conductive networks. This porous 3DCG matrix with its abundant open pores and large surface area can provide efficient channels for fast charge transport and allow full contact between the electrode and electrolyte, leading to improved electrochemical activity. The robust 3D architecture offers abundant stress buffer space to tolerate volume expansion and ensures robust structural stability during the electrochemical processes. The synergistic effect between components endows the 3DCG/MnO electrodes with excellent electrochemical performance, retaining a high specific capacity of 526.7 mA h g-1 at 2.0 A g-1 with 98% capacity retention over 1400 cycles. This work provides a promising route for the practical application of fast and durable lithium-ion batteries and suggests insights for rational structural designs with other transition metal oxides.
为了适应巨大的体积变化并提高锂离子电池中氧化锰阳极的较差的电化学反应动力学性能，我们合成了一种独特的 3D 多孔 CNT/石墨烯-MnO 结构，其中 MnO 纳米粒子均匀地装饰在 3D 相互连接的 CNT/石墨烯（3DCG）导电网络上。这种具有丰富开放孔和大表面积的多孔 3DCG 基体可为快速电荷传输提供有效的通道，并允许电极与电解质充分接触，从而提高电化学活性。坚固的 3D 结构提供了丰富的应力缓冲空间，以容纳体积膨胀，并确保在电化学过程中具有坚固的结构稳定性。各组分之间的协同效应赋予了 3DCG/MnO 电极优异的电化学性能，在 2.0 A g-1 时具有 526.7 mA h g-1 的高比容量，在 1400 次循环后保持 98%的容量。这项工作为实用的快速和耐用的锂离子电池提供了一条有前景的途径，并为其他过渡金属氧化物的合理结构设计提供了思路。
