Donor–acceptor-linked covalent organic framework (COF)-based electrolyte can not only fulfill highly-selective Li⁺ conduction, but also offer a crucial opportunity to understand the role of electronic density in quasi-solid-state Li metal batteries.

Donor–acceptor-linked COF electrolyte results in Li⁺ transference number 0.83, high ionic conductivity 6.7 × 10^–4 S cm⁻¹ and excellent cyclic ability in Li metal batteries.

In situ characterizations, density functional theory calculation and time-of-flight secondary ion mass spectrometry are adopted to expound the mechanism of the rapid migration of Li⁺ in the “donor–acceptor” electrolyte system.

基于供体-受体连接的共价有机骨架（COF）的电解质不仅可以实现高选择性的Li ⁺传导，而且还为了解电子密度在准固态锂金属电池中的作用提供了重要的机会。

给体-受体连接的COF电解质导致Li ⁺迁移数为0.83，离子电导率高达6.7 × 10 ^–4 S cm ^-1 ，并且在锂金属电池中具有优异的循环能力。

采用原位表征、密度泛函理论计算和飞行时间二次离子质谱技术，阐述了Li ⁺在“供体-受体”电解质体系中快速迁移的机理。