Nitrogen-Doped Graphene-Buffered Mn2O3 Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium-Ion Batteries
Nitrogen-Doped Graphene-Buffered Mn2O3 Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium-Ion Batteries
复制标题
用于快速充电和高放电容量锂离子电池的氮掺杂石墨烯缓冲Mn2O3纳米复合阳极
DOI：
10.1002/smll.201903311
复制
发表时间：
2019-11-14
期刊：
影响因子：
13.3
通讯作者：
Wang, Qiang
中科院分区：
文献类型：
--
作者：
Yuan, Shuang;Chen, Weibin;Wang, Qiang
Mn2O3具有理论容量大、放电电位低的优点，是一种很有前途的锂离子电池负极材料。然而，低电导率和容量衰落限制了其实际应用。本文首次采用简单有效的水热策略在中性水溶液中合成了具有一维纳米线结构的Mn2O3，然后将Mn2O3纳米颗粒和氮掺杂的还原氧化石墨烯（N-rGO）与Mn2O3纳米线（Mn2O3- gncs）复合，以提高其体积利用率和电导率。作为锂离子电池的负极材料，Mn2O3-GNCs具有较高的可逆容量（1350 mAh g(-1)）、稳定的循环稳定性和良好的倍率性能。令人惊讶的是，Mn2O3-GNC电极也表现出快速充电的能力；即使在200次循环后（充电：10 A g(-1)）；放电：0.5 A g(-1))，其放电容量也可以保持在约500 mAh g（-1）。此外，Mn2O3-GNCs还具有相当的全电池性能和超级电容器性能。优异的电化学性能可归因于N-rGO网络结构和一维纳米线结构，可以确保离子和电子的快速传输。
Mn2O3 is a promising anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity and low discharge potential. However, low electronic conductivity and capacity fading limits its practical application. In this work, Mn2O3 with 1D nanowire geometry is synthesized in neutral aqueous solutions by a facile and effective hydrothermal strategy for the first time, and then Mn2O3 nanoparticle and nitrogen-doped reduced graphene oxide (N-rGO) are composited with Mn2O3 nanowires (Mn2O3-GNCs) to enhance its volume utilization and conductivity. When used as an anode material for LIBs, the Mn2O3-GNCs exhibit high reversible capacity (1350 mAh g(-1)), stable cycling stability, and good rate capability. Surprisingly, the Mn2O3-GNC electrodes can also show fast charging capability; even after 200 cycles (charge: 10 A g(-1); discharge: 0.5 A g(-1)), its discharge capacity can also keep at approximate to 500 mAh g(-1). In addition, the Mn2O3-GNCs also have considerable full cell and supercapacitor performance. The excellent electrochemical performances can be ascribed to the N-rGO network structure and 1D nanowire structure, which can ensure fast ion and electron transportation.