电解质
过电位
阳极
钝化
电池(电)
材料科学
化学工程
电化学
阴极
电极
无机化学
复合材料
化学
乙二胺
图层(电子)
物理化学
功率(物理)
工程类
物理
量子力学
作者
Shuaishuai Zhang,Xiaoqiang Liu,Yingying Feng,Dan Wang,Huixiang Yin,Zhenzhen Chi,Lin Li,Jie Liu,Shaoxiang Li,Junfei Huang,Ziyang Guo,Lei Wang
标识
DOI:10.1016/j.jpowsour.2021.230226
摘要
Rechargeable Li–CO 2 batteries have attracted extensive attentions since their excellent abilities of absorbing CO 2 and delivering super-high energy density. Recently, many effective catalysts have been developed to improve the performance of Li–CO 2 batteries, which nevertheless is still inhibited by problems derived from Li anodes and liquid electrolyte, such as Li dendrites and electrolyte leakage. In this work, we construct Li-ethylenediamine (LE) layer on Li (LE-Li) and use it to further react with tetraglyme in battery to obtain tetraglyme-based polymer electrolyte (TPE). The uniform LE layer coupled with in-situ formed TPE can not only restrain dendrite generation, Li-induced side reaction and corresponding passivation/pulverization, but also reduce interfacial impedance and enable battery work normally at bending condition. Therefore, the LE-Li electrode presents the more stable electrochemical property than the pure Li anode in symmetric battery. Additionally, the Li–CO 2 battery using LE-Li/TPE displays high discharge capacity of 22873 mAh g −1 and good rate capability under full discharge/charge condition. When operated at cut-off capacity, this cell can steadily run for 104 cycles with a small overpotential of <1.9 V, which is better than bare Li/liquid electrolyte-based Li–CO 2 battery. The LE-Li/TPE based Li–CO 2 flexible cell also shows superior performance even at different bending angles. • We constructed LE-Li by spontaneous reaction between Li metal and ethylenediamine. • LE-Li cross-linked with tetraglyme to build polymer electrolyte (TPE) in battery. • Synergy between LE-Li and TPE effectively improved performance of Li–CO 2 battery.
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