The Cover Feature illustrates the porous and complex nature of the Li‐ion battery electrode. During cell operation the active material grains suffer from volume changes, and as a consequence show surface area expansion/contraction. It is highly desirable to develop in‐situ techniques to track these changes. More information can be found in the Article by B. Hamankiewicz and co‐workers.

中文翻译：

---

封面功能：锂离子电池电极有效表面积变化的原位测定新技术（电池和超级电容器10/2020）

封面功能说明了锂离子电池电极的多孔性和复杂性。在电池运行过程中，活性材料颗粒会发生体积变化，结果显示出表面积膨胀/收缩。迫切需要开发现场技术来跟踪这些变化。有关更多信息，请参见B. Hamankiewicz及其同事的文章。