过电位
电解质
锂(药物)
化学
氧气
氢
无机化学
化学工程
材料科学
电化学
物理化学
电极
有机化学
医学
工程类
内分泌学
作者
Zongqiang Sun,Xiaodong Lin,Chutao Wang,Ajuan Hu,Qing Hou,Yanyan Tan,Wenjie Dou,Ruming Yuan,Mingsen Zheng,Quanfeng Dong
标识
DOI:10.1002/anie.202207570
摘要
Glymes are the most widely used electrolyte solvents in lithium-oxygen batteries (LOBs) due to their relatively high stability. However, their associated LOBs have long been plagued by large charge overpotential, which is closely related to the sluggish two-electron Li2 O2 oxidation mechanism. Here, we report a new electrolyte solvent-1,1,3,3-tetramethylurea (TMU) for LOBs with high performance and an alternative mechanism, where a kinetically favorable one-electron Li2 O2 oxidation pathway can happen in the urea electrolyte system, thus leading to a much lower charge overpotential (≈0.51 V) compared to the tetraglyme-based LOBs (≈1.27 V). Besides, TMU also exhibits good stability since it does not contain any α-hydrogen atoms that are vulnerable to be attacked by superoxide species, thus suppressing the hydrogen abstraction side reactions. Consequently, the TMU-based LOBs can stably work for more than 135 cycles, which is four times that of the tetraglyme-based LOBs (≈28 cycles).
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