石墨烯使5V级电池的电流收集器成为可能
Xiaowei Shi1,2, Yan Zhang1, Huandi Zhang1
1State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi 710049, China.
Nano letters
|September 26, 2024
概括
石墨烯涂层可以防止高压离子电池中的腐蚀. 这种保护提高了电池性能,提高了先进的储能应用的速率能力和循环稳定性.
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:
- 在五伏级运行的高能量密度离子电池对先进的应用有前途.
- 这些电池中的 (Al) 电流收集器腐蚀限制了电化学性能.
- 了解Al腐蚀机制和制定保护策略对于5V级电池的开发至关重要.
研究的目的:
- 为了研究5V级离子电池中Al电流收集器腐蚀的机制.
- 开发基于石墨烯的保护策略,以提高Al电流收集器的耐腐蚀性.
- 评估石墨烯保护对5V级电池电化学性能的影响.
主要方法:
- 用石墨烯保护的Al电流采集器的实验制造.
- 在5V级电池环境中对受保护电流采集器进行电化学测试.
- 理论计算以阐明石墨烯的腐蚀抑制机制.
主要成果:
- 石墨烯起到物理屏障的作用,防止 LiPF6 基电解质与 Al 电流收集器之间的直接接触.
- 石墨烯有效地减少了涉及Al电流收集器和来自电解质的酸 (HF) 的副作用.
- 石墨烯增加了Al腐蚀反应潜力,显著阻碍了电化学腐蚀.
- 石墨烯保护的Al电流采集器表现出更好的电化学性能,特别是在速率能力和循环稳定性方面.
结论:
- 石墨烯保护是一种有效的策略,可以减轻5V级离子电池中的Al电流集电器腐蚀.
- 增强的耐腐蚀性导致更好的电池速率性能和长期循环稳定性.
- 这项工作为开发更耐用和高性能5V级电池提供了可行的途径.
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