了解富含的阴极复合材料中的碳添加剂/硫化物固体电解质接口,并优先考虑电气和离子导电网络之间的相应相互作用,以提高全固态电池速率能力
Kashif Saleem Saqib1, Tom James Embleton1, Jae Hong Choi1
1Department of Smart Green Technology Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48547, Republic of Korea.
ACS applied materials & interfaces
|August 20, 2024
概括
研究人员开发了一种全固态电池的新方法,使用碳纳米管和碳纳米纤维的组合. 这种方法提高了硫化物电解质的导电性和稳定性,提高了电池的性能和安全性.
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:
- 全固态电池与硫化物电解质和富含的阴极提供高能量密度和安全性.
- 活性材料的电导率差,需要导电添加剂,这些添加剂可以降解硫化物电解质.
- 硫化物电解质中的短碳添加剂的不稳定性可以增加散装电阻,阻碍性能.
研究的目的:
- 研究短长度碳添加剂对硫化物基阴极复合材料的稳定性和导电性的影响.
- 优化碳纳米管 (CNT) 和碳纳米纤维 (CNF) 的组合,以提高全固态电池的性能.
主要方法:
- 覆盖富含的LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极,其中CNT的重量百分比较低.
- 使用大方比CNF作为阴极复合材料中的主要导电添加剂.
- 电化学测试以评估初始库伦比效率,容量保留和离子电阻.
主要成果:
- 一种含有0.3%重量CNTs和4.7%重量CNFs的复合物在0.05C时达到83.55%的初始库伦比克效率.
- 在0.5C的50个周期中观察到90.1%的优异容量保留.
- 优化的复合材料表现出较低的离子电阻,表明离子传输得到改善.
结论:
- 在NCM811阴极上使用低重量百分比的CNT作为涂层是有效的.
- 将CNT涂层与CNF作为主要添加剂相结合,可以最大限度地减少硫化物电解质降解.
- 这一战略提供了一个可行的解决方案,以提高硫化物为基础的全固态电池的速率能力和稳定性.
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