Chemical Strain Analysis of the VO2 Cathode for Zn-Ion Batteries at Different Temperatures,The Journal of Physical Chemistry C

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Chemical Strain Analysis of the VO2 Cathode for Zn-Ion Batteries at Different Temperatures
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2024-04-01 , DOI: 10.1021/acs.jpcc.4c00233
Yuchuan Sun ₁ , Xiuling Shi ₁ , Xiaoying Long ₁ , Yibo Weng ₁ , Yao Gao ₂ , Yan Huang ₁ , Kaikai Li ₁

Affiliation

Periodic volume changes in the cathode due to Zn²⁺ insertion and extraction significantly impact the cycling life of aqueous Zn-ion batteries. However, accurately measuring these volume changes remains a significant challenge for understanding the cycling stability of the cathode. In this study, we employed an operando digital image correlation (DIC) technique to measure the chemical strain in the VO₂ cathode during cycling at different current densities and working temperatures. Our findings revealed that the magnitude of the chemical strain is independent of current density and decreases with increasing temperature from 20 to 40 °C, despite higher capacity at 40 °C than at 20 °C. By combining electrochemical–mechanical coupling modeling, we calculated the partial molar volume of Zn²⁺ in the VO₂ cathode at different temperatures and found that 40 °C has a significantly smaller partial molar volume, resulting in less volume change. These results provide valuable insights for designing high-performance cathode materials in zinc-ion batteries.

中文翻译：

不同温度下锌离子电池VO2正极的化学应变分析

由于 Zn ²⁺插入和脱出而导致的阴极体积的周期性变化显着影响水系锌离子电池的循环寿命。然而，准确测量这些体积变化对于了解阴极的循环稳定性仍然是一个重大挑战。在本研究中，我们采用操作数字图像相关 (DIC) 技术来测量 VO ₂阴极在不同电流密度和工作温度下循环期间的化学应变。我们的研究结果表明，化学应变的大小与电流密度无关，并且随着温度从 20°C 升高到 40°C 而减小，尽管 40°C 时的容量高于 20°C 时的容量。通过结合电化学-机械耦合模型，我们计算了不同温度下VO _2阴极中Zn²⁺的偏摩尔体积，发现40℃时Zn 2+ 的偏摩尔体积明显较小，导致体积变化较小。这些结果为设计锌离子电池中的高性能正极材料提供了宝贵的见解。

更新日期：2024-04-01

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