| 微波原位制备作为锂离子电池电极材料的石墨烯/TiO2 纳米复合物 |
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| 引用本文： | 杨良伟,陈昊然,金鑫,刘伟,于新民,刘俊鹏,宋环君,李晓东,于艺,王鹏,张宝鹏.微波原位制备作为锂离子电池电极材料的石墨烯/TiO2 纳米复合物[J].稀有金属材料与工程,2022,51(3):821-826. |
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| 作者姓名： | 杨良伟 陈昊然 金鑫 刘伟 于新民 刘俊鹏 宋环君 李晓东 于艺 王鹏 张宝鹏 |
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| 作者单位： | 航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074,航天特种材料及工艺技术研究所，北京 100074 |
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| 基金项目： | Beijing Municipal Science & Technology Commission (Z171100005317001) |
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| 摘 要： | 通过改造的家用微波炉，实现了原位高效制备石墨烯/TiO2纳米复合物。结果表明：微波辅助法能够在商用锐钛矿型TiO2纳米颗粒表面均匀制备石墨烯纳米片，通过SiO2/Si的剧烈电晕放电，其制备时间仅需数分钟（最短3 min）。石墨烯纳米片的尺寸大约为50 nm且缺陷很少。TiO2晶体结构仍为锐钛矿型，主要归功于极短的制备周期和较低的反应温度（600~700 ℃）。石墨烯具有优异的电导率，可以提升锂离子扩散速率、提高电子传输速率并降低接触电阻。在1 C（170 mA·g-1）条件下石墨烯/TiO2纳米复合物的电池放电比容量提高了2倍。与商业化锐钛矿型TiO2纳米颗粒相比，在1 C到5 C的不同充放电倍率下，石墨烯/TiO2纳米复合物的比容量差距显著扩大。
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| 关 键 词： | 石墨烯/TiO2纳米复合物 微波辅助 电晕放电 原位制备 锂离子电池 |
| 收稿时间： | 2021/1/21 0:00:00 |
| 修稿时间： | 2021/3/4 0:00:00 |
In-situ Synthesis of Graphene/TiO2 Nanocomposites via Microwave as Anode Materials for Li-ion Batteries |
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| Yang Liangwei,Chen Haoran,Jin Xin,Liu Wei,Yu Xinmin,Liu Junpeng,Song Huanjun,Li Xiaodong,Yu Yi,Wang Peng and Zhang Baopeng.In-situ Synthesis of Graphene/TiO2 Nanocomposites via Microwave as Anode Materials for Li-ion Batteries[J].Rare Metal Materials and Engineering,2022,51(3):821-826. |
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| Authors: | Yang Liangwei Chen Haoran Jin Xin Liu Wei Yu Xinmin Liu Junpeng Song Huanjun Li Xiaodong Yu Yi Wang Peng and Zhang Baopeng |
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| Affiliation: | Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China,Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China |
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| Abstract: | Through the modified household microwave oven system, the graphene-based nanocomposites were in-situ and efficiently synthesized. Results show that the graphene nanosheets can be uniformly generated on the surface of the commercial anatase TiO2 nanoparticles by microwave-assisted method in a few minutes (the minimum duration is 3 min) through the acute corona discharge of SiO2/Si. The size of graphene nanosheet is about 50 nm, and few defects can be observed. The crystal structure of anatase TiO2 remains due to the short production period and low synthesis temperature (600~700 °C). The excellent electrical conductivity of graphene can improve the Li ion diffusion and the electron transport, and decrease the contact resistance at the interface of electrode/electrolyte. The as-prepared graphene/TiO2 nanocomposite electrode shows a two-fold increase of capacity with good cycling stability under the condition of 1 C (170 mA·g-1), compared with the traditional TiO2 nanoparticles. The specific capacity gap of graphene/TiO2 nanocomposite is substantially widened under different charge-discharge rates (1~5 C), compared with that of the commercial anatase TiO2 nanoparticles. |
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| Keywords: | graphene/TiO2 nanocomposites microwave-assisted corona discharge in-situ synthesis Li-ion batteries |
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