Boyang Liu, Shengda D. Pu, Christopher Doerrer, Dominic Spencer Jolly, Robert A. House, Dominic L. R. Melvin, Paul Adamson, Patrick S. Grant, Xiangwen Gao, Peter G. Bruce
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引用次数: 0
摘要
与锂离子技术相比,固态锂电池可以提供更高的能量密度和更高的安全性。然而,在固态复合阴极中,由于循环过程中阴极体积的反复变化,可能会发生机械退化,这可以通过施加一个显著的,但通常不切实际的单轴堆叠压力来部分减轻。在这里,我们比较了基于Li 4 Ti 5 O 12 (LTO)(可忽略体积变化)和Nb 2 O 5(+4%膨胀)的复合电极在不同堆叠压力下循环的行为。初始LTO容量和保留率不受压力的影响,但对于n2o5,当施加< 2mpa的堆积压力时,由于循环体积变化引起的颗粒间开裂和固-固接触损失,它们明显降低。这项工作证实了阴极机械稳定性和堆压对固态电池长期可循环性的重要性。这表明固态电池需要低体积变化的阴极材料或适当的缓冲层,特别是在低堆叠压力下。
The effect of volume change and stack pressure on solid‐state battery cathodes
Abstract Solid‐state lithium batteries may provide increased energy density and improved safety compared with Li‐ion technology. However, in a solid‐state composite cathode, mechanical degradation due to repeated cathode volume changes during cycling may occur, which may be partially mitigated by applying a significant, but often impractical, uniaxial stack pressure. Herein, we compare the behavior of composite electrodes based on Li 4 Ti 5 O 12 (LTO) (negligible volume change) and Nb 2 O 5 (+4% expansion) cycled at different stack pressures. The initial LTO capacity and retention are not affected by pressure but for Nb 2 O 5 , they are significantly lower when a stack pressure of <2 MPa is applied, due to inter‐particle cracking and solid‐solid contact loss because of cyclic volume changes. This work confirms the importance of cathode mechanical stability and the stack pressures for long‐term cyclability for solid‐state batteries. This suggests that low volume‐change cathode materials or a proper buffer layer are required for solid‐state batteries, especially at low stack pressures.
期刊介绍:
SusMat aims to publish interdisciplinary and balanced research on sustainable development in various areas including materials science, engineering, chemistry, physics, and ecology. The journal focuses on sustainable materials and their impact on energy and the environment. The topics covered include environment-friendly materials, green catalysis, clean energy, and waste treatment and management. The readership includes materials scientists, engineers, chemists, physicists, energy and environment researchers, and policy makers. The journal is indexed in CAS, Current Contents, DOAJ, Science Citation Index Expanded, and Web of Science. The journal highly values innovative multidisciplinary research with wide impact.