扩张石墨-VO2复合式阴极材料的制备和水性离子电池中的性能
Jiaye Li1,2, Jing Zhao1,2, Zebin Wang1,2
1Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Materials (Basel, Switzerland)
|June 27, 2024
概括
研究人员使用二氧化和扩展石墨开发了一种新的复合阴极材料,用于更安全,更具成本效益的水性离子电池. 这种材料显著提高了容量和循环稳定性,提供了一个有前途的储能解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池中的有机电解质构成安全风险,并且由于有限的资源而昂贵.
- 水性离子电池为储能提供了更安全,更经济,更环保的替代方案.
- 二氧化 (VO2) 显示出潜力,但在离子电池循环时遭受结构不稳定.
研究的目的:
- 探索制备一种新型复合阴极材料的可行性,以克服VO2的循环限制.
- 为了研究扩张石墨 (EG) /VO2复合材料在水性离子电池中的性能.
- 为了提高基于的阴极材料的容量,循环稳定性和速率能力.
主要方法:
- 采用简单的热水法来合成EG/VO2复合阴极材料.
- 用合成的EG/VO2复合物和纯VO2进行比较,组装了水性离子电池.
- 评估了电化学性能,包括放电能力,循环稳定性,库伦比效率和速率能力.
主要成果:
- 与纯VO2相比,EG/VO2复合阴极表现出优越的电化学性能.
- 在0.1 A g-1下实现了345 mAh g-1的高特异性放电容量,库伦比克效率接近100%.
- 复合材料表现出极好的循环稳定性,在100个循环后保持77%的容量,在2000个循环后保持108.9 mAh/g,在2 A/g时保持108.9 mAh/g.
结论:
- 扩张石墨的集成有效地减轻了VO2的结构脆弱性,大大提高了其在水性离子电池中的循环性能.
- EG/VO2复合物代表了高性能,安全和成本效益的储能应用的有前途的阴极材料.
- 该研究强调了复合材料设计的潜力,以克服下一代电池技术中的材料限制.
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