The Assembly of a High-Efficiency Tris-benzotriazolate-Based Metal–Organic Framework Solid-State Electrolyte
Zhangyi Xiong, Shitao Wu, Liang Gu, Mengyang Zhai, Yuke Pan, Yanhang Ma, Zhijie Chen
Abstract
High Resolution Image Download MS PowerPoint Slide Metal–organic frameworks (MOFs) with tunable ion transport pathways are considered promising solid-state electrolyte (SSE) candidates for developing lithium or sodium metal batteries. However, their low ionic conductivity and inferior stability with metal anodes limit practical applications. Herein we synthesized a high-stability tris-benzotriazolate-based MOF─Cu-TTBT─with ordered pore channels for SSE applications via a network-directed approach. Cu-TTBT, overcoming the synthetic challenge of tritopic benzotriazolate-based linkers, greatly advances the field of azolate-based MOFs. The resultant framework displays fast ion transport pathways with a high ionic conductivity of 1.83 × 10 –4 S cm –1 and 1.1 × 10 –4 S cm –1 at 298 K for Cu-TTBT-Li and Cu-TTBT-Na, respectively, among the highest in azolate-based MOFs. The Li|SSE|LiFePO 4 and Na|SSE|Na 3 V 2 (PO 4 ) 3 coin cells exhibit stable cycling performances over 200 cycles at 1.0 C and 298 K. This research advances the synthetic chemistry of azolate-based MOFs and paves the way for the development of robust frameworks with high-efficiency SSE performances.