不同孔结构碳电极材料亲电解质性改性及电化学性能研究  

Electrolyte-philic modification and electrochemical performance of carbon electrode materials with different porous structure

作　　者：赵磊 李媛 张倩倩 彭元佑 冉奋 ZHAO Lei;LI Yuan;ZHANG Qianqian;PENG Yuanyou;RAN Fen(School of Mechanical Engineering,Longdong University,Qingyang 745000,Gansu Province,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]陇东学院机械工程学院,甘肃庆阳745000 [2]兰州理工大学材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《电子元件与材料》2022年第2期120-127,共8页Electronic Components And Materials

基　　金：国家自然科学基金(51763014,52073133);甘肃省青年科技基金计划(20JR10RA137)。

摘　　要：碳电极材料良好的亲电解质性能够促进电解质离子在其表面吸附/脱附,从而提高其电化学性能。为了探究亲电解质性对不同孔结构碳电极材料电化学性能的影响,采用悬浮聚合、可逆加成断裂链转移活性聚合和超浓乳液聚合分别制备碳微球、介孔碳和分级多孔碳,并将具有良好亲水性的聚乙二醇(PEG)分子刷接枝在三种碳材料的表面改善它们的亲水系电解质性。电化学测试表明,相比于碳微球和介孔碳电极材料,亲水系电解质性对分级多孔碳电极材料的电化学性能的影响更为显著。在电流密度为0.625 A/g时,PEG改性的分级多孔碳电极材料比容量比未改性的分级多孔碳电极材料的比容量高245.4%。此外,当电流密度提高10倍(6.25 A/g)时,PEG改性的分级多孔碳电极材料比容量仍然达到其在0.625 A/g电流密度下比容量的64%。The excellent electrolyte-philicity of carbon electrode materials could promote the(ad/de)sorption of electrolyte ions on its surface,thus increasing its electrochemical performance.In order to explore the influence of electrolyte-philicity on the electrochemical performance of carbon electrode materials with different porous structure,carbon microspheres,mesoporous carbon and hierarchical porous carbon were prepared by suspension polymerization,reversible addition-fragmentation chain transfer(RAFT)polymerization,and ultra-concentrated emulsion polymerization,respectively.And then the hydrophilic polyethylene glycol(PEG)brushes were grafted onto the surface of the three carbon materials to improve their electrolyte-philicity to aqueous electrolyte.Electrochemical test results demonstrate that the electrolyte-philicity of the hierarchical porous carbon electrode materials have more significant effect on its electrochemical performance,compared with the carbon microspheres and mesoporous carbon electrode materials.The specific capacity of the PEG-modified hierarchical porous carbon electrode materials could be increased by 245.4%than that of the unmodified one at current density of 0.625 A/g.When the current density is up to 6.25 A/g,the specific capacity of PEG-modified hierarchical porous carbon electrode materials still reaches 64%of its specific capacity at current density of 0.625 A/g.

关 键 词：亲电解质性 分级多孔碳 分子刷 聚合物接枝 电化学电容器 

分 类 号：TB324[一般工业技术—材料科学与工程] TQ316.3[化学工程—高聚物工业]