Solid-state batteries (SSBs) are promising next-generation energy storage devices, but Li dendrite formation hinders their development. This paper introduces a flexible electron-blocking interfacial shield (EBS) to protect garnet electrolytes. The EBS, formed *in situ*, enhances lithiophilicity, stabilizes Li volume changes, and blocks electron penetration, as confirmed by density functional theory (DFT) calculations. The resulting cells exhibit improved critical current density (1.2 mA cm⁻²) and stable cycling (over 400 h at 1 mA cm⁻²). This strategy effectively suppresses Li dendrites and offers new insights into SSB interface design.

Hanyu Huo, Jian Gao, Ning Zhao, Dongxing Zhang, Nathaniel Graham Holmes, Xiaona Li, Yipeng Sun, Jiamin Fu, Ruying Li, Xiangxin Guo, Xueliang Sun