Solid polymer electrolytes (SPEs) offer enhanced Li+ conductivity when plasticized with high-dielectric solvents like DMF. However, DMF degradation at the anode causes poor cycle life. This paper introduces a composite polymer electrolyte using a Hofmann-DMF coordination complex. DMF is tethered to Hofmann frameworks, creating a locally DMF-rich interface for Li+ conduction. This achieves 6.5 × 10−4 S cm−1 ionic conductivity at room temperature and stable cycling for over 6000 h in Li || Li symmetric cells and 1000 cycles at 1 C in Li || SPAN full cells.

Yanfei Zhu, Zhoujie Lao, Mengtian Zhang, Tingzheng Hou, Xiao Xiao, Zhihong Piao, Gongxun Lu, Zhiyuan Han, Runhua Gao, Lu Nie, Xinru Wu, Yanze Song, Chaoyuan Ji, Jian Wang, Guangmin Zhou