Qian Xukun, Wang Hao, Wang Ruirui, Zhang Lilei, Li Mingming, Zhou Yong-Ning, Wu Renbing
School of Engineering, Lishui University, Lishui 323000, PR China.
Department of Materials Science, Fudan University, Shanghai 200433, PR China.
J Colloid Interface Sci. 2021 Apr;587:192-201. doi: 10.1016/j.jcis.2020.11.077. Epub 2020 Nov 26.
Transition metal nitrides are of great interest as potential anodes for lithium-ion batteries (LIBs) owing to their high theoretical capacity. However, poor cycling stability and rate performance greatly hinder their practical applications. To better alleviate these problems, a unique 3D hierarchical nanocomposite constructed by dual carbon-coated CoN nano-grains wrapped with carbon and reduced graphene oxide (CoN@C@rGO) was synthesized through one-step simultaneous nitridation and carbonization of zeolitic imidazolate frameworks@GO precursor. The 3D hierarchical CoN@C@rGO composite can combine the good conductivity and mechanical strength of rGO and a high theoretical capacity of CoN. When explored as anode material for LIBs, CoN@C@rGO exhibits a high reversible capacity of ~860 mAh g at a current density of 1.0 A g after 500 cycles and excellent high-rate capability (665 and 573 mAh g at current densities of 3.2 and 6.4 A g, respectively). The excellent electrochemical performance of CoN@C@rGO can be ascribed to its hierarchically porous structure and the synergistic effect between CoN nano-grains and rGO.
过渡金属氮化物因其高理论容量而作为锂离子电池（LIBs）的潜在阳极备受关注。然而，较差的循环稳定性和倍率性能极大地阻碍了它们的实际应用。为了更好地缓解这些问题，通过对沸石咪唑酯骨架@氧化石墨烯（ZIF-8@GO）前驱体进行一步同时氮化和碳化，合成了一种独特的三维分级纳米复合材料，该材料由碳和还原氧化石墨烯包裹的双碳包覆CoN纳米颗粒构成（CoN@C@rGO）。三维分级CoN@C@rGO复合材料可以结合rGO良好的导电性和机械强度以及CoN的高理论容量。当作为LIBs的阳极材料进行测试时，CoN@C@rGO在500次循环后，在1.0 A g的电流密度下表现出约860 mAh g的高可逆容量，以及优异的高倍率性能（在3.2和6.4 A g的电流密度下分别为665和573 mAh g）。CoN@C@rGO优异的电化学性能可归因于其分级多孔结构以及CoN纳米颗粒与rGO之间的协同效应。
