A universal synthetic route to carbon nanotube/transition metal oxide nano-composites for lithium ion batteries and electrochemical capacitors

作者：Zhou, Han; Zhang, Lusi; Zhang, Dongyang; Chen, Shuangqiang; Coxon, Paul R.; He, Xiong; Coto, Mike; Kim, Hyun-Kyung; Xi, Kai^*; Ding, Shujiang^*

来源：Scientific Reports, 2016, 6(1): 37752.

DOI：10.1038/srep37752

• HOLLOW SPHERES
• FRICTION CHARACTERISTICS
• ULTRATHIN NANOSHEETS
• GRAPHENE
• NANOTUBES
• NANOPARTICLES
• CATALYST
• ZNCO2O4
• ELECTROCATALYST
• SUPERCAPACITORS

We report a simple synthetic approach to coaxially grow transition metal oxide (TMO) nanostructures on carbon nanotubes (CNT) with ready control of phase and morphology. A thin (similar to 4 nm) sulfonatedpolystyrene (SPS) pre-coating is essential for the deposition of transition metal based materials. This layer has abundant sulfonic groups (-SO3-) that can effectively attract Ni2+, Co2+, Zn2+ ions through electrostatic interaction and induce them via hydrolysis, dehydration and recrystallization to form coaxial (NiO, Co3O4, NiCoO2 and ZnCo2O4) shells and a nanosheet-like morphology around CNT. These structures possess a large active surface and enhanced structural robustness when used as electrode materials for lithium-ion batteries (LIBs) and electrochemical capacitors (ECs). As electrodes for LIBs, the ZnCo2O4@ CNT material shows extremely stable cycling performance with a discharge capacity of 1068 mAh g(-1) after 100 cycles at a current density of 400 mAg(-1). For EC applications, the NiCoO2@ CNT exhibits a high capacitance of 1360 Fg(-1) at current densities of 10 Ag-1 after 3000 cycles and an overall capacitance loss of only 1.4%. These results demonstrate the potential of such hybrid materials meeting the crucial requirements of cycling stability and high rate capability for energy conversion and storage devices.

• 出版日期2016-11-25
• 单位西安交通大学