Aqueous Lithium-Ion Batteries Using O2 Self-Elimination Polyimides Electrodes

作者：Chen, Long^*; Li, Wangyu; Guo, Zhaowei; Wang, Yonggang; Wang, Congxiao; Che, Yong; Xia, Yongyao

来源：Journal of the Electrochemical Society, 2015, 162(10): A1972-A1977.

DOI：10.1149/2.0101510jes

• ANODE MATERIAL

Lithiated negative electrode materials (in discharge state) in aqueous solutions could be oxidized in the presence O-2 and H2O, resulting in their poor charge/discharge cycle life. In the present work, we reported that lithiated polyimide can be oxidized by O-2 in aqueous solution without much negative effect on its charge/discharge cyclability. The lithiated polyimide is converted to the almost identical polyimide structure by O-2 oxidation in the aqueous solution based on FTIR. spectra (O-2 self-elimination performance). We also confirmed the good charge/discharge voltage profile and capacity of polyimide as an anode material in aqueous solutions. A sealed polymide-AC/LiNO3/LiMn2O4 aqueous LIB exhibited excellent cycle life with a capacity retention above 95% after 1000 charge/discharge cycles on 2C rate (charge/discharge) at room temperature, even when the battery was overcharged once after the 50th cycle.

• 出版日期2015
• 单位复旦大学