在高面积容量离子电池电极中的板特性
Venkatesh Kabra1, Rachel Carter2, Mengya Li3
1School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.
ACS applied materials & interfaces
|June 28, 2024
概括
在更厚的离子电池电极中的金属涂层从高电荷状态转移到高超电位模式. 了解这种转变对于防止电池退化和安全问题至关重要.
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
- 电池技术 电池技术
背景情况:
- 离子电池的安全性和寿命受到金属涂层的损害.
- 为了更高的能量密度,增加电极厚度使得理解板倾向变得复杂.
研究的目的:
- 为了研究更厚的离子电池电极中的涂层模式.
- 分析电极厚度和N/P比对板行为的影响.
- 在不进行广泛的老化测试的情况下,开发用于金倾向的预测方法.
主要方法:
- 结合实验性金易受影响的条件与中等尺度建模.
- 检查的电极配对容量为2.5至6 mAh/cm2,N/P比为0.9至1.8.
- 利用光学显微镜和电化学特征来识别涂层形态.
主要成果:
- 确定了从高电荷状态 (SOC) 板转向高超电位 (OP) 板的转变,电极厚度增加.
- 发现了两种涂层模式的不同形态.
- 发现电极厚度超过3mAh/cm2或75μm容易发生高OP涂层,限制负电极利用率.
结论:
- 预测和避免高SOC和高OP涂层条件的融合对于电池性能和安全至关重要.
- 较厚的电极 (>75微米) 容易受到高OP涂层的影响,从而抵消了负电极过大尺寸的好处.
- 实验热梯度和中等尺度模型为评估电极设计对性能和安全的影响提供了有价值的工具.
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