A NiCo2O4 nanosheet-mesoporous carbon composite electrode for enhanced reversible lithium storage
| Autor: | Xin Xu, Jun Li, Shujiang Ding, Guoxin Gao, Shaodong Cheng, Mingyan Li, Baorui Wang, R. Vasant Kumar, Paul R. Coxon, Chunhui Xiao, Zhaoyang Fan, Guang Yang, Yingxin Xi, Kai Xi |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Non-blocking I/O Oxide Nanotechnology 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Cobaltite law.invention chemistry.chemical_compound Chemical engineering chemistry law Specific surface area General Materials Science Calcination 0210 nano-technology Mesoporous material Nanosheet |
| Zdroj: | Carbon. 99:633-641 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2015.12.035 |
| Popis: | As a member of the ternary metal oxide family, nickel cobaltite is considered as a promising electrode material. This is due to its high theoretical capacity, low diffusional resistance to protons, ease of electrolyte penetration, superior ionic/electronic conductivity and higher electrochemical activity compared to single metallic oxides such as NiO or Co3O4. However, NiCo2O4's relatively low electrical conductivity and its tendency to pulverize due to the volume changes experienced during the charge–discharge process remain a pressing issue to be solved. Here we demonstrate a simple co-precipitation and calcination routine to graft ultrathin NiCo2O4 nanosheets onto highly-ordered mesoporous carbon CMK-3 to form a new mesoporous-nanosheet structure which can accommodate stresses induced by volume changes and provide favourable conducting paths. The material exhibits a high specific surface area and excellent electrochemical performance, which can be ascribed to the ultrathin NiCo2O4 nanosheets and the interconnected conductive network of the mesoporous matrix. The nanosheets and the inner channels of CMK-3 are more beneficial to the diffusion of Li+ while the interconnected conductive network favours fast electron conduction. |
| Databáze: | OpenAIRE |
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