材料科学
溶剂化
钝化
氢键
氢
催化作用
反应性(心理学)
电池(电)
阴极
氧气
化学工程
物理化学
纳米技术
有机化学
化学
离子
热力学
分子
功率(物理)
图层(电子)
替代医学
病理
工程类
物理
医学
作者
Qi Xiong,Chao‐Le Li,Ziwei Li,Yulong Liang,Jianchen Li,Jun-Min Yan,Gang Huang,Xinbo Zhang
标识
DOI:10.1002/adma.202110416
摘要
Surface discharge mechanism induced cathode passivation is a critical challenge that blocks the full liberation of the ultrahigh theoretical energy density in aprotic Li-O2 batteries. Herein, a facile and universal concept of hydrogen-bond-assisted solvation is proposed to trigger the solution discharge process for averting the shortcomings associated with surface discharge. 2,5-Di-tert-butylhydroquinone (DBHQ), an antioxidant with hydroxyl groups, is introduced as an exemplary soluble catalyst to promote solution discharge by hydrogen-bond-assisted solvation of O2- and Li2 O2 (OH···O). Thus, a Li-O2 battery with 50 × 10-3 m DBHQ delivers an extraordinary discharge capacity of 18 945 mAh g-1 (i.e., 9.47 mAh cm-2 ), even surpassing the capacity endowed by the state-of-the-art reduction mediator of 2,5-di-tert-butyl-1,4-benzoquinone. Besides, an ultrahigh Li2 O2 yield of 97.1% is also achieved due to the depressed reactivity of the reduced oxygen-containing species (O2- , LiO2 , and Li2 O2 ) by the solvating and antioxidative abilities of DBHQ. Consequently, the Li-O2 battery with DBHQ exhibits excellent cycling lifetime and rate capability. Furthermore, the generalizability of this approach of hydrogen-bond-assisted solution discharge is verified by other soluble catalysts that contain OH or NH groups, with implications that could bring Li-O2 batteries one step closer to being a viable technology.
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