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| Effect of carbonization conditions on the electrochemical performance of ZnO@C anode material for zinc-based battery |
| Received:March 10, 2018 Revised:March 12, 2018 |
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| DOI： |
| KeyWord:carbon-coated ZnO; carbonization temperature; carbonization time; zinc-based battery; secondary battery |
| Author | Institution |
| ZHANG Zhi-jian |
中南大学 冶金与环境学院 |
| TIAN Zhong-liang |
中南大学 冶金与环境学院 |
| YANG Chao |
中南大学 冶金与环境学院 |
| ZHAO Heng-qin |
中国地质科学院 郑州矿产综合利用研究所 |
| LAI Yan-qing |
中南大学 冶金与环境学院 |
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| Abstract: |
| Carbon-coated ZnO anode materials were synthesized by in-situ polymerization followed with a carbonization process using resorcinol-formaldehyde resin as carbon source. The experimental result shows that the thickness of the carbon layer on the surface of nanosized ZnO particles is uniform and the structure is complete. The degree of graphitization of the carbon layer increases with the extending of carbonization time. And the lattice defects increase with the rise of carbonization temperature. The effects of carbonization time and temperature on electrochemical performances of carbon-coated ZnO were investigated, and the optimized carbonization condition obtained is that carbonizing precursor at 700 °C for 8 h. When the carbonization time extends from 6 h to 10 h, the charge transfer resistance of the materials decreases and the initial discharge capacity increases from 400 mAh g-1 to 530 mAh g-1. However, the cycling performance of sample prepared with 8h is best. When carbonization temperature increases from 600 ℃ to 800 ℃, the sample prepared at 700 ℃ shows least charge transfer resistance and best cycle performance with a capacity retention rate 97.8% after 85 charge-discharge cycle. |
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