使用化学应变分析探测水性离子电池中的MnO2循环稳定性
Shasha Chen1, Xiaoying Long1, Faysal Md1
1School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
ChemSusChem
|September 4, 2025
概括
机械降解限制水性离子电池 (AZIB). 我们发现控制电流密度可以抑制二氧化 (MnO2) 阴极的相变,减少应变并提高循环稳定性.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 阴极的机械降解限制了水性离子电池 (AZIB) 的循环寿命.
- 在循环过程中MnO2阴极的反应机制和机械演变是不清楚的.
- 了解这些过程对于开发稳定的AZIB至关重要.
研究的目的:
- 在充电-放电循环过程中全面调查 δ-MnO2 阴极的电化学相变和化学应变.
- 阐明机械降解的潜在机制.
- 确定增强电极循环稳定的策略.
主要方法:
- 使用一个定制的现场应变测试系统.
- 使用数字图像相关性进行精确的应变测量.
- 执行 δ-MnO2 阴极的电化学循环.
主要成果:
- 放电-充电机制涉及H+和Zn2+的初始插入,导致弹性变形.
- 在放电过程中发生到ZnMn2O4的相变.
- 充电导致不可逆转的塑性变形和体积膨胀,这是由于相位转换和ZnMn3O7的形成.
- 增加电流密度可以抑制相位转换并减少剩余应变.
结论:
- 这项研究揭示了d-MnO2阴极中的机械降解的详细机制.
- 其余应变和体积膨胀与循环过程中的相变化有关.
- 优化电流密度是提高AZIB循环稳定的可行策略.
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