南开大学师唯团队报道了多孔配位链氢键框架中锂离子的高效传输。相关研究成果于2023年4月25日发表在《美国化学会杂志》。

Li⁺在固体中的快速选择性传输对锂金属电池高性能固态电解质（SSEs）的开发起着关键作用。具有可调Li⁺传输路径的多孔化合物是有前途的SSE，但很难同时实现Li⁺传输动力学、电化学稳定性窗口和界面相容性方面的综合性能。

该文中，研究人员报道了一种基于多孔配位链的氢键框架（NKU-1000），该框架包含用于Li⁺传输的阵列电负性位点，表现出1.13×10^–3 S cm^–1的优异Li⁺电导率、0.87的高Li⁺转移数和5.0 V的宽电化学窗口。基于NKU-1000的SSE组装固态电池在500次循环后显示出94.4%的高放电容量，并且可以在宽温度范围内工作而不会形成锂枝晶，这源于促进均匀高速率Li⁺通量的线性跳跃位点和可以缓冲Li⁺传输过程中结构变化的柔性结构。

附：英文原文

Title: High-Efficiency Lithium-Ion Transport in a Porous Coordination Chain-Based Hydrogen-Bonded Framework

Author: Zongsu Han, Runhao Zhang, Jialong Jiang, Zhonghang Chen, Youxuan Ni, Weiwei Xie, Jun Xu, Zhen Zhou, Jun Chen, Peng Cheng, Wei Shi

Issue&Volume: April 25, 2023

Abstract: Fast and selective Li+ transport in solid plays a key role for the development of high-performance solid-state electrolytes (SSEs) of lithium metal batteries. Porous compounds with tunable Li+ transport pathways are promising SSEs, but the comprehensive performances in terms of Li+ transport kinetics, electrochemical stability window, and interfacial compatibility are difficult to be achieved simultaneously. Herein, we report a porous coordination chain-based hydrogen-bonded framework (NKU-1000) containing arrayed electronegative sites for Li+ transport, exhibiting a superior Li+ conductivity of 1.13 × 10–3 S cm–1, a high Li+ transfer number of 0.87, and a wide electrochemical window of 5.0 V. The assembled solid-state battery with NKU-1000-based SSE shows a high discharge capacity with 94.4% retention after 500 cycles and can work over a wide temperature range without formation of lithium dendrites, which derives from the linear hopping sites that promote a uniformly high-rate Li+ flux and the flexible structure that can buffer the structural variation during Li+ transport.

DOI: 10.1021/jacs.3c00647

Source: https://pubs.acs.org/doi/10.1021/jacs.3c00647