通过引入天然氨基酸基团来设计高容量、长寿命钠离子电池用有机分子电极  

Organic electrodes with multi-role natural amino acid groups for sodiumion batteries with high-capacity and long-life

作　　者：张世从 赵晓琳 李涛 刘建军 黄富强 林天全 Shicong Zhang;Xiaolin Zhao;Tao Li;Jianjun Liu;Fuqiang Huang;Tianquan Lin(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of High-performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics Chinese Academy of Sciences,Shanghai 200050,China;State Key Laboratory of Rare Earth Materials Chemistry and Applications,Peking University,Beijing 100871,China;Zhangjiang Institute for Advanced Study(ZIAS),Shanghai Jiao Tong University,Shanghai 201210,China)

机构地区：[1]School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]State Key Laboratory of High-performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics Chinese Academy of Sciences,Shanghai 200050,China [3]State Key Laboratory of Rare Earth Materials Chemistry and Applications,Peking University,Beijing 100871,China [4]Zhangjiang Institute for Advanced Study(ZIAS),Shanghai Jiao Tong University,Shanghai 201210,China

出　　处：《Science China Materials》2023年第10期3817-3826,共10页中国科学（材料科学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2019YFA0210600);the National Natural Science Foundation of China(51922103 and BC0500463)。

摘　　要：有机电极具有结构可设计性强、容量大、可容纳大离子等优点.然而,在钠离子电池中,有机电极材料的容量仍然很低,且其在有机电解质中的高溶解度导致其寿命较短.如何通过化合物设计来提高其性能一直是研究人员关注的问题.本研究通过简单方法将氨基酸接枝到有机化合物上,提高了其容量和循环稳定性.首先,氨基酸之间的氢键使其形成更稳定的层状结构;氨基酸基团在有机电极材料和羧甲基纤维素粘合剂之间形成分子间相互作用,降低界面阻力,显著提高循环稳定性,使得钠离子电池循环次数超过2000次.其次,实验和计算结果表明,氨基酸基团提供了Na^(+)转运途径和额外的可逆存储位点,从而提高了比容量(~300 mA h g^(-1)).本策略可以启发未来钠离子电池的有机分子设计.Organic electrodes possess numerous advantages of structure designability,high capacity,and accommodating large cations.However,the capacity of organic electrode materials in sodium-ion batteries remains low,and their solubility in organic electrolytes leads to a shortened lifespan.Researchers are thus concerned about enhancing their performance through compound design.In this study,we successfully improved both the capacity and cycling stability by simply grafting amino acids onto organic compounds(PMCDI).Firstly,the introduction of amino acids facilitated the formation of a more stable layered structure of PMCDI through hydrogen bonding.Additionally,the amino acid groups promoted intermolecular interactions between the organic electrode material and the carboxymethyl cellulose binder,thereby reducing interfacial resistance and significantly enhancing the cycling stability for over 2000 cycles.Secondly,both experimental and computational results revealed that the non-conjugated carboxylic acid group provided Na+transport pathways and an additional reversible storage site,leading to an improvement in specific capacity(~300 mA h g^(-1)).The strategy employed in this work sheds light on the design of organic molecules for future sodium-ion batteries.

关 键 词：organic electrode amino acid groups sodium-ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TB322[一般工业技术—材料科学与工程]