摘要
以大豆蛋白(SPI)、丙烯酰胺(AAm)、ZnCl_(2)、LiCl为原料,制备得到一种具备抗冻性能的大豆蛋白-聚丙烯酰胺复合盐(SPI-PAAm/ZnCl_(2)-LiCl)抗冻凝胶电解质,并将其应用到混合电容器中,考察器件在低温下的电化学性能。研究结果表明:ZnCl_(2)和LiCl的加入,破坏了凝胶电解质中水分子间氢键,并赋予凝胶电解质优异的低温离子电导率和较好的低温力学性能。当ZnCl_(2)与LiCl物质的量比为5∶12时,此条件下的抗冻凝胶电解质性能最优。在-70℃下,抗冻凝胶电解质经历100次应变为100%的循环拉伸测试仍保持结构完整,应力保持率>65%,塑性变形率<25%,能量损耗系数<0.35。基于此抗冻凝胶电解质的混合电容器在低温下仍具备良好的电化学性能,在-80℃下可以正常工作,低温环境下能量密度集中在50~200 Wh/kg,功率密度集中在1000~30000 W/kg,即便在-70℃下,混合电容器的功率密度接近1000 W/kg,能量密度>10 Wh/kg。同时,在-70℃下循环充放电5000次,电容保持率>94%,表现出优异的循环性能。
A soy protein-polyacrylamide composite salt(SPI-PAAm/ZnCl_2-LiCl) anti-freezing gel electrolyte with antifreeze performance was prepared using soybean protein(SPI),acrylamide(AAm),ZnCl_(2) and LiCl as raw materials,and it was applied to hybrid capacitors for the investigation of the electrochemical performance of hybrid capacitor at low temperature.The results of research showed that the addition of ZnCl_(2) and LiCl broke the hydrogen bonds among the water molecules in the gel electrolyte,and endowed the gel electrolyte with excellent low temperature ionic conductivity and good low temperature mechanical properties.When the molar ratio of ZnCl_(2) to LiCl was 5 ∶12,the performance of antifreeze gel electrolyte was the best.At-70 ℃,the anti-freezing gel electrolyte could maintain structural integrity after 100 tensile cycles under 100% strain,the stress retention rate was more than 65%,the plastic deformation rate was less than 25% and the energy loss coefficient was less than 0.35.The hybrid capacitor based on this anti-freezing gel electrolyte exhibited good electrochemical performance at low temperature,and could work normally at-80 ℃.At low temperature,the energy density was concentrated in the range of 50-200 Wh/kg,and the power density was concentrated in the range of 1 000-30 000 W/kg.Even at-70 ℃,the power density of the hybrid capacitor was nearly 1 000 W/kg and the energy density was more than 10 Wh/kg.Meanwhile,the capacitance retention rate of the hybrid capacitor was more than 94% after 5 000 cyclic charge and discharge at-70 ℃,indicating the excellent cycling performance.
作者
杨福生
李雨羲
王定坤
詹洵
南静娅
王春鹏
YANG Fusheng;LI Yuxi;WANG Dingkun;ZHAN Xun;NAN Jingya;WANG Chunpeng(Institute of Chemical Industry of Forest Products,CAF、Key Lab.of Biomass Energy and Material,Jiangsu Province、Key Lab.of Chemical Engineering of Forest Products,National Forestry and Grassland Administration、National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass,Nanjing 210042,China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2024年第1期51-57,共7页
Chemistry and Industry of Forest Products
基金
中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2020GA001)。
关键词
凝胶电解质
抗冻性能
充放电性能
循环性能
gel electrolyte
anti-freezing performance
charge-discharge performance
cycling performance
