2的诱导相位转换调节 极提高储存可逆性
Guannan Zu1, Manchen Zhang2, Hexiong Liu2
1Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an Key Laboratory of Clean Energy, School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China.
ACS applied materials & interfaces
|December 11, 2024
概括
二硫化 (WS2) 阳极在金属离子电池面临的挑战,如硫转运和纳米粒子增长. 引入无形氧化 (Al2O3) 控制微观结构,增强循环稳定性和寿命.
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:
- 硫化 (WS2) 是金属离子电池 (AMIB) 的一个有前途的阳极材料,因为它的层次结构和高容量.
- 关键的挑战包括硫的穿效应和 (W) 纳米颗粒的不受控制的增长,限制离子适应和电池寿命.
- 在封闭电池中对微观结构演变的现场控制仍然很困难.
研究的目的:
- 研究离子电池中WS2阳极的相位转换路径.
- 制定策略,以减轻微观结构退化和增强循环可逆性.
- 优化基于WS2的阳极,以提高AMIB的性能.
主要方法:
- 研究了薄膜和粉末型WS2阳极的相位转换机制.
- 将无形氧化 (Al2O3) 引入WS2以调节微观结构.
- 在电池循环期间进行微观结构演变的现场分析.
- 评估电池性能,包括循环稳定性和容量保留.
主要成果:
- 具有强大的W-Li2S结合的可逆转换机制减轻了穿效应.
- 超过~10 nm的W/WS2氧化还原对颗粒大小会导致由于W沉而导致严重的容量衰减.
- 无形Al2O3的引入使得在现场控制,保持W/WS2粒子大小在3-5nm.
- 在750-1400个周期内实现了衰变抑制,提高了转换效率和容量保留.
结论:
- 通过无形Al2O3进行现场微结构控制对于WS2阳极的高可逆性至关重要.
- 这种方法有效地抑制了产能衰减,并延长了AMIB的寿命.
- 这些发现为优化Mo组硫化物/化物/化物用于下一代AMIB提供了洞察力.
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