基于COF的单一Li+固体电解质加速离子扩散并抑制准固态有机电池中的枝晶生长,Carbon Energy

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基于COF的单一Li+固体电解质加速离子扩散并抑制准固态有机电池中的枝晶生长
Carbon Energy ( IF 19.5 ) Pub Date : 2022-07-05 , DOI: 10.1002/cey2.248
Genfu Zhao ₁ , Zhiyuan Mei ₁ , Lingyan Duan ₁ , Qi An ₁ , Yongxin Yang ₁ , Conghui Zhang ₁ , Xiaoping Tan ₂ , Hong Guo ₁

Affiliation

固态电解质 (SSE) 是一种固体离子导体和电子绝缘材料，众所周知，它在将锂金属负极适配为固态电池中的高容量正极方面发挥着至关重要的作用。在各种SSEs中，单一锂离子导体在提高离子电导率、消除界面副反应和拓宽电化学窗口方面具有优势。由于有序的一维通道和精确的化学修饰特征，共价有机骨架 (COF) 是实现单一锂离子传导行为的最佳平台。在此，我们深入研究了三种类型的羧酸锂 COF（表示为 LiOOC-COF n , n = 1、2 和 3) 作为单个锂离子导电 SSE。受益于有序的定向离子通道，单锂离子导体 LiOOC-COF3在室温下表现出 1.36 × 10 ^-5 S cm ^{-1的优异离子电导率和 0.91 的高转移数。}_{此外，它在以有机小分子环己烷己酮（C 6} O ₆）为正极、锂金属为正极的准固态有机电池中表现出优异的电化学性能，具有长期循环、高容量输出和无枝晶等特点。作为阳极，能够有效避免有机电极被液态电解质溶解。

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COF-based single Li+ solid electrolyte accelerates the ion diffusion and restrains dendrite growth in quasi-solid-state organic batteries

A solid-state electrolyte (SSE), which is a solid ionic conductor and electron-insulating material, is known to play a crucial role in adapting a lithium metal anode to a high-capacity cathode in a solid-state battery. Among the various SSEs, the single Li-ion conductor has advantages in terms of enhancing the ion conductivity, eliminating interfacial side reactions, and broadening the electrochemical window. Covalent organic frameworks (COFs) are optimal platforms for achieving single Li-ion conduction behavior because of well-ordered one-dimensional channels and precise chemical modification features. Herein, we study in depth three types of Li-carboxylate COFs (denoted LiOOC-COFn, n = 1, 2, and 3) as single Li-ion conducting SSEs. Benefiting from well-ordered directional ion channels, the single Li-ion conductor LiOOC-COF3 shows an exceptional ion conductivity of 1.36 × 10⁻⁵ S cm⁻¹ at room temperature and a high transference number of 0.91. Moreover, it shows excellent electrochemical performance with long-term cycling, high-capacity output, and no dendrites in the quasi-solid-state organic battery, with the organic small molecule cyclohexanehexone (C₆O₆) as the cathode and the Li metal as the anode, and enables effectively avoiding dissolution of the organic electrode by the liquid electrolyte.

更新日期：2022-07-05

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