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Space-Confined Synthesis of Yolk–Shell Structured Co3O4/Nitrogen-Doped Carbon Nanocomposites with Hollow Mesoporous Carbon Nanocages as Advanced Functional Anodes for Lithium-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-10-19 , DOI: 10.1021/acsaem.0c02098 Xiaojun Lu 1 , Anran Liu 1 , Yuanjian Zhang 1 , Songqin Liu 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-10-19 , DOI: 10.1021/acsaem.0c02098 Xiaojun Lu 1 , Anran Liu 1 , Yuanjian Zhang 1 , Songqin Liu 1
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Despite the high theoretical capacity as the anode material of lithium-ion batteries (LIBs), Co3O4 is subjected to rapid capacity decline and poor rate performance owing to its severe volume expansion and poor electronic conductivity. Herein, a yolk–shell structured Co3O4 nanocomposite with double carbon shells (Co3O4@NC@CNC) was fabricated as an electrode material to improve the properties of LIBs. The Co3O4@NC@CNC was derived from ZIF-67 within carbon nanocages (CNC) by carbonization. The hollow CNC acted as nanoreactors, which could effectively control the growth of ZIF-67 within the CNC and reduce the particle size of Co3O4@nitrogen-doped carbon (Co3O4@NC) nanocomposite derived from ZIF-67. When assessed as an LIBs anode material, the optimized Co3O4@NC@CNC material exhibited outstanding properties with high capacity, superior cycling stability, and rate performance (960 mAh g–1 at 0.5 A g–1 and 772 mAh g–1 at 2 A g–1 after 100 cycles). The electrochemical properties were ascribed to the yolk–shell structure and the synergistic effect of the nanoscale Co3O4@NC and CNC, which improved the electronic conductivity, alleviated the volume expansion effect, shortened the diffusion distance of Li+, and accelerated Li+ transport kinetics. Moreover, the large specific surface and mesoporous structure were beneficial to the diffusion of electrolyte as well as capacitive contribution.
中文翻译：
空心介孔碳纳米笼作为锂离子电池高级功能阳极的卵黄壳结构Co 3 O 4 /氮掺杂碳纳米复合材料的空间受限合成
尽管作为锂离子电池（LIBs）负极材料的理论容量很高，但Co 3 O 4由于其严重的体积膨胀和差的电导率而遭受容量的快速下降和差的速率性能。在这里，卵黄壳结构的具有双碳壳的Co 3 O 4纳米复合材料（Co 3 O 4 @ NC @ CNC）被制成电极材料以改善LIBs的性能。Co 3 O 4 @ NC @ CNC是通过碳化从碳纳米笼（CNC）中的ZIF-67衍生而来的。中空CNC充当纳米反应器，可有效控制ZIF-67在CNC内的生长并减小Co的粒径衍生自ZIF-67的3 O 4氮掺杂碳（Co 3 O 4 @NC）纳米复合材料。当被评估为LIBs阳极材料时，优化的Co 3 O 4 @ NC @ CNC材料表现出出色的性能，具有高容量，出色的循环稳定性和速率性能（0.5 A g –1和772 mAh g –时为960 mAh g –1 1在2 A G -1 100次循环后）。电化学性质归因于卵黄壳结构和纳米级Co 3 O 4的协同作用@NC和CNC，提高了电导率，减轻了体积膨胀效应，缩短了Li +的扩散距离，并加快了Li +的传输动力学。而且，大的比表面积和中孔结构有利于电解质的扩散以及电容性贡献。
更新日期：2020-10-19
中文翻译：
空心介孔碳纳米笼作为锂离子电池高级功能阳极的卵黄壳结构Co 3 O 4 /氮掺杂碳纳米复合材料的空间受限合成
尽管作为锂离子电池（LIBs）负极材料的理论容量很高，但Co 3 O 4由于其严重的体积膨胀和差的电导率而遭受容量的快速下降和差的速率性能。在这里，卵黄壳结构的具有双碳壳的Co 3 O 4纳米复合材料（Co 3 O 4 @ NC @ CNC）被制成电极材料以改善LIBs的性能。Co 3 O 4 @ NC @ CNC是通过碳化从碳纳米笼（CNC）中的ZIF-67衍生而来的。中空CNC充当纳米反应器，可有效控制ZIF-67在CNC内的生长并减小Co的粒径衍生自ZIF-67的3 O 4氮掺杂碳（Co 3 O 4 @NC）纳米复合材料。当被评估为LIBs阳极材料时，优化的Co 3 O 4 @ NC @ CNC材料表现出出色的性能，具有高容量，出色的循环稳定性和速率性能（0.5 A g –1和772 mAh g –时为960 mAh g –1 1在2 A G -1 100次循环后）。电化学性质归因于卵黄壳结构和纳米级Co 3 O 4的协同作用@NC和CNC，提高了电导率，减轻了体积膨胀效应，缩短了Li +的扩散距离，并加快了Li +的传输动力学。而且，大的比表面积和中孔结构有利于电解质的扩散以及电容性贡献。
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