Composite polymer electrolyte reinforced by graphitic carbon nitride nanosheets for room-temperature all-solid-state lithium batteries  

作　　者：Qingyue Han Suqing Wang Wenhan Kong Bing Ji Haihui Wang 

机构地区：[1]School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China [2]Beijing Key Laboratory for Membrane Materials and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第2期257-263,共7页中国化学工程学报（英文版）

基　　金：the National Natural Science Foundation of China (22178120);Guangdong Natural Science Funds for Distinguished Young Scholar (2017A030306022);Guangzhou Technology Project (202002030164)。

摘　　要：By virtue of the flexibility and safety, polyethylene oxide(PEO) based electrolytes are regarded as an appealing candidate for all-solid-state lithium batteries. However, their application is limited by the poor ionic conductivity at room temperature, narrow electrochemical stability window and uncontrolled growth of lithium dendrite. To alleviate these problems, we introduce the ultrathin graphitic carbon nitride nanosheets(GCN) as advanced nanofillers into PEO based electrolytes(GCN-CPE). Benefiting from the high surface area and abundant surface N-active sites of GCN, the GCN-CPE displays decreased crystallinity and enhanced ionic conductivity. Meanwhile, Fourier transform infrared and chronoamperometry studies indicate that GCN can facilitate Li+migration in the composite electrolyte. Additionally, the GCN-CPE displays an extended electrochemical window compared with PEO based electrolytes. As a result, Li symmetric battery assembled with GCN-CPE shows a stable Li plating/stripping cycling performance, and the all-solid-state Li/LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622) batteries using GCN-CPE exhibit satisfactory cyclability and rate capability in a voltage range of 3-4.2 V at 30 ℃.

关 键 词：Electrolytes POLYMERS Graphitic carbon nitride nanosheets Composites Room temperature All-solid-state battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]