在金属电池中,树的生长和死的形成以及使用保护层的缓解:一个阶段性实地研究
Bharat Raj Pant1, Yao Ren1, Ye Cao1
1Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, Texas 76019, United States.
ACS applied materials & interfaces
|October 10, 2024
概括
金属电池看起来很有前途,但由于树的生长和死亡的形成而受到影响. 一个新的相场模型模拟了这一过程,揭示了保护层对于稳定的电池循环和防止死至关重要.
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
- 计算建模 计算建模
背景情况:
- 金属电池 (LMB) 具有较高的特定容量,但面临着树生长和死形成的挑战,阻碍了实际应用.
- 现有的研究主要集中在实验研究和树突生长的理论模型上,对死形成和完整循环过程的理论研究有限.
研究的目的:
- 开发和使用相场模型来模拟LMB中的电和剥离过程.
- 在电池循环过程中,研究裸体和受保护阳极中死形成的机制.
- 了解保护层及其完整性对金属阳极稳定性的影响.
主要方法:
- 开发一个相场模型来模拟电和剥离.
- 在剥离模型中引入一个步骤函数,以准确捕捉死动态.
- 模拟带有和没有保护层的阳极行为,包括保护层断裂的场景.
主要成果:
- 模拟证实,在充电和放电期间,裸体阳极的树生长和脱离,形成死.
- 随后的循环显示,由于表面粗度增加,树的增长和死的增加.
- 基径较小的树突更容易脱离,产生更多的死.
- 保护的阳极表现出稳定的循环,没有树或死亡的形成.
- 破裂的保护层导致优先成长为裂,加速死的形成.
结论:
- 阶段场模型为在LMB循环过程中死形成的机制提供了基本的见解.
- 保护层对于防止树的生长和LMB中死的形成至关重要.
- 保护层的完整性至关重要;骨折可能会加剧死问题.
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