Cross-Linked Chains of Metal–Organic Framework Afford Continuous Ion Transport in Solid Batteries

• Published in: ACS energy letters Vol. 6; no. 7; pp. 2434 - 2441
• Main Authors: Zeng, Qinghan, Wang, Jia, Li, Xin, Ouyang, Yuan, He, Wenchao, Li, Dixiong, Guo, Sijia, Xiao, Yingbo, Deng, Haoyan, Gong, Wei, Zhang, Qi, Huang, Shaoming
• Format: Journal Article
• Language: English
• Published: American Chemical Society 09.07.2021
• ISSN: 2380-8195; 2380-8195
• DOI: 10.1021/acsenergylett.1c00583

Metal–organic frameworks (MOFs) have attracted intensive study as solid electrolytes (SEs) in recent years. However, MOF particles work separately in SEs and numerous interfaces hinder a high-efficiency ion transport, which lowers the performance of solid-state batteries (SSBs). Herein, continuous ion-conductive paths were constructed by cross-linked MOF chains. Chains of a newly developed MOF (Zr-BPDC-2SO3H) were grown on bacterial cellulose (BC) nanofibers to provide a continuous ion transport network. The cross-linked MOF chains exhibit a high ionic conductivity of 7.88 × 10–4 S cm–1 at 25 °C, single-ion transport ability (t Li +=0.88), a wide electrochemical window up to 5.10 V, excellent interface compatibility, and the capability for suppressing lithium dendrites. Most importantly, the SSB fabricated with the cross-linked MOF chains shows more than 100% improved specific capacity in comparison to an SSB without this design and stable cycling performance at 3 C. This work provides a splendid strategy for developing high-performance SEs with porous ion conductors.