石墨烯锂离子电容器的制备及其性能研究

Preparation and Capacitive Performance of MnO2@MoO3 Core-shell Nanomaterial

本实验制备了B、N共掺杂的3D石墨烯,并将其作为锂离子电容器的容量型阴极材料和电池型阳极材料。通过合理的设计,所制备的B、N共掺杂3D石墨烯(BN-3DG)作为锂离子电容器的阴极材料和阳极材料,其电化学性能均得到了明显的提升。构建了一个4.5 V BNG//BNG锂离子电容器件。当器件具有220 W h·kg^-1高能量密度的同时,也具有22.5 kW·kg^-1的高功率密度,以及良好的循环稳定性。

Because the charge storage capacity and electrode kinetics does not match between the positive and negative electrodes,high energy density at high power density is still a challenge for the current Li-ion capacitors(LICs).In this work,B and N co-doped 3D graphene was prepared by a simple method and used as capacitive cathode and battery anode for LICs.The co-doping of B and N plays an important role in adjusting the porosity,functional groups and electrical conductivity of 3D graphene.The prepared B and N co-doped 3D graphene was used as the cathode and anode for LICs,and its electrochemical properties have been significantly improved by reasonable design.This greatly reduces the mismatch between the two electrodes.A 4.5 V BNG//BNG LICs device was constructed with excellent energy density and power capabilities compared to other reported LICs configurations.In particular,the as-fabricated BNG//BNG LICs device can deliver a large energy density of 220 W h·kg^-1 and a high power density of 22.5 kW·kg^-1,as well as good cycle stability.