作为离子和离子电池的可逆宿主材料的MoS,WS和MoWS片
Arijit Roy1, Sonjoy Dey1, Gurpreet Singh1
1Mechanical and Nuclear Engineering, Kansas State University, Manhattan, Kansas 66506-0100, United States.
ACS omega
|June 17, 2024
概括
过渡金属二甲基化物 (TMD) 对离子电池 (NIB) 和离子电池 (KIB) 显示出前景. 二硫化物 (MoS2) NIB优异,而二硫化物 (WS2) KIB表现不佳,合金的性能中等.
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:
- 过渡金属二化物 (TMD) 和它们的合金对于开发可持续的储能解决方案至关重要,因为它们具有独特的结构性质.
- 虽然离子 (Li-ion) 电池技术已经成熟,但使用TMD阳极的离子 (Na-ion) 和离子 (K-ion) 电池的研究仍在出现.
研究的目的:
- 研究二硫化物 (MoS2),二硫化物 (WS2) 和二硫化物 (MoWS2) 合金作为离子电池 (NIB) 和离子电池 (KIB) 的阳极的性能.
- 为了比较这些TMD材料在NIB和KIB中的电化学行为,循环稳定性和离子间歇机制.
主要方法:
- 进行循环稳定性测试,以评估电池在多个循环中的性能.
- 循环电压测量和电化学阻抗光谱被用来分析降解过程和电阻.
- 研究了Na-离子和K-离子的电化学间隙和去除过程,以了解离子运动.
主要成果:
- 在NIB中,二硫化物 (MoS2) 显示出异常的初始充电能力 (1056 mAh g-1) 和高库伦比效率.
- 二硫化物 (WS2) 在KIB中表现不佳,初始充电容量低 (130 mAh g-1) 和保留最小.
- 对于NIB和KIB,MoWS2合金表现出适度的充电能力和周期性效率.
- 在TMD/合金中较小的金属离子和组成元素与阻力降低和降解速度较慢相关.
- 与K离子相比,具有较大的几何尺寸的TMD片显示出更好的Na-离子间歇反应反应能力.
结论:
- 在NIB和KIB之间,TMD阳极的性能差异很大,MoS2在NIB中表现优越.
- 材料组成和离子大小在确定基于TMD的电池的稳定性和效率方面发挥着关键作用.
- 了解离子间歇机制是优化TMD材料的关键,用于下一代离子和离子电池.
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