在基于的阳极中调节扩散偏好,以提高快速和均的化
Jiapeng Zhang1,2, Jiangchuan Li1, Ziteng Song1
1State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
ACS nano
|August 19, 2025
概括
研究人员开发了一种策略,通过调整沿谷物边界的离子扩散来改进阳极. 这种方法提高了阳极的性能,使得稳定的循环和增加容量,即使在低温下.
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:
- (Si) 阳极遭受缓慢的化动力学和显著的体积膨胀,导致性能降低.
- 现有的基于Si的阳极面临着化延迟和结构不稳定的挑战.
- 商业光伏废料 (Sipv) 是一个潜在的,但未得到充分利用的阳极材料.
研究的目的:
- 提出和验证一个Li+-diffusion-preference调策略,用于的同质化.
- 为了提高阳极的电化学性能和结构稳定性.
- 用回收的光伏废料作为阳极材料.
主要方法:
- 开发了一种策略,以引导Li+扩散,优先沿着Si粒子的粒度边界 (GBs).
- 通过计算模拟和实验测试验证了战略.
- 制造并经过测试的Sipv/石墨 (Sipv/g) 复合阳极.
主要成果:
- 通过沿着GBs的偏好的Li+扩散,在Si粒子中实现了快速和均的化.
- 由于同位素化和谷物增强效应,证明Sipv的结构稳定性得到增强.
- 与商业阳极相比,Sipv/g阳极在1000个循环后保持了93.8%的容量,并在-20°C时增加了136.2%的容量.
结论:
- +-扩散-偏好调策略有效地克服了阳极中的化延迟.
- 使用具有增强结构完整性的Sipv可提高电化学性能和稳定性.
- 这种方法为改进下一代电池的基阳极提供了一种可行的方法.
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