Low-temperature and high-voltage planar micro-supercapacitors based on anti-freezing hybrid gel electrolyte  

作　　者：Manning Chen Xiaoyu Shi Xiaolei Wang Hanqing Liu Sen Wang Caixia Meng Yu Liu Liangzhu Zhang Yuanyuan Zhu Zhong-Shuai Wu 

机构地区：[1]College of Chemistry and Environment,Shenyang University of Technology,Shenyang 110870,Liaoning,China [2]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

出　　处：《Journal of Energy Chemistry》2022年第9期195-202,I0006,共9页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(22125903,51872283,22109160,22005297);the Dalian Innovation Support Plan for High Level Talents(2019RT09);the The Joint Fund of the Yulin University and the Dalian National Laboratory For Clean Energy(DNL),CAS,DNL Cooperation Fund,CAS(DNL201912,DNL201915,DNL202016,DNL202019),DICP(DICP ZZBS201802,DICP I2020032);The Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002,YLU-DNL Fund 2021009);the China Postdoctoral Science Foundation(2021M693126,2020M680995,2021M703145,2021M693127);the International Postdoctoral Exchange Fellowship Program(Talent-Introduction Program)(YJ20210311);the Plan for promoting innovative talents of Education Department of Liaoning Province(LCR2018015);the Shenyang Youth Science and Technology Project(RC200444);the Natural Science Foundation of Liaoning Province(2021-MS-234)。

摘　　要：Micro-supercapacitors(MSCs)are considered as highly competitive power sources for miniaturized electronics.However,narrow voltage window and poor anti-freezing properties of MSCs in conventional aqueous electrolytes lead to low energy density and limited environmental adaption.Herein,we report the construction of low-temperature and high-energy-density MSCs based on anti-freezing hybrid gel electrolytes(HGE)through introducing ethylene glycol(EG)additives into aqueous LiCl electrolyte.Since EG partially destroys hydrogen bond network among water molecules,the HGE exhibits maximum electrochemical stability window of 2.7 V and superior anti-freezing features with a glass transition temperature of-62.8℃.Further,the optimized MSCs using activated carbon microelectrodes possess impressive volumetric capacitance of 28.9 F cm^(-3)and energy density of 10.3 mWh cm^(-3)in the voltage of 1.6 V,2.6 times higher than MSCs tested in 1.2 V.Importantly,the MSCs display 68.3%capacitance retention even at-30℃ compared to the value at 25℃,and ultra-long cyclability with 85.7%of initial capacitance after 15,000 times,indicating extraordinary low-temperature performance.Besides,our devices offer favorable flexibility and modular integration.Therefore,this work provides a general strategy of realizing flexible,safe and anti-freezing microscale power sources,holding great potential towards subzero-temperature microelectronic applications.

关 键 词：Hybrid gel electrolyte Micro-supercapacitors Low temperature High voltage Graphene 

分 类 号：TQ427.26[化学工程] TM53[电气工程—电器]