LiCl改性离子液体提升铝离子电池性能的研究  

Performance improvement of aluminum ion batteries by LiCl modified ionic liquid

作　　者：邱金辉 史继诚 QIU Jinhui;SHI Jicheng(School of Transportation Engineering,Dalian Jiaotong University,Dalian Liaoning 116028,China;School of Materials Science and Engineering,Dalian Jiaotong University,Dalian Liaoning 116028,China)

机构地区：[1]大连交通大学交通工程学院,辽宁大连116028 [2]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《电源技术》2025年第3期590-595,共6页Chinese Journal of Power Sources

摘　　要：在铝离子电池中,AlCl_(3)/Et_(3)NHCl(三乙基氯化铵)离子液体的主要电迁移离子是Et_(3)NH^(+)、AlCl_(4)-、Al_(2)Cl_(7)-,在不增加额外阴离子的前提下,利用LiCl对离子液体改性,研究了改性对离子液体性质和铝离子电池性能的作用。AlCl_(3)和LiCl摩尔比为5∶1时,改性后AlCl_(3)/LiCl/Et_(3)NHCl离子液体的电导率较AlCl_(3)和Et_(3)NHCl摩尔比1.4∶1提高了43.7%。AlCl_(3)/LiCl/Et_(3)NHCl作为电解液,商品V_(2)O(5)作为正极活性材料,电流密度为31.2 mA/g,电池放电比容量为98.1 mAh/g;在电流密度62.5 mA/g下,经过175次循环后,库仑效率维持在95%以上。离子液体改性后,铝离子电池负极铝箔表面SEI膜电阻显著增大,铝离子电化学反应的传荷电阻明显降低,铝离子电池的比容量和循环稳定性极大提高。In aluminum ion batteries,the primary electromigration ions present in the AlCl_(3)/Et_(3)NHCl(triethylammonium chloride)ionic liquid are Et_(3)NH^(+)、AlCl_(4)- and Al_(2)Cl_(7)-.This study utilized LiCl to modify the ionic liquid without the introduction of additional anions,investigating the impact of this modification on both the properties of the ionic liquid and the performance of aluminum ion batteries.Notably,when the molar ratio of AlCl_(3) to LiCl is set at 5∶1,the conductivity of the modified AlCl_(3)/LiCl/Et_(3)NHCl ionic liquid increases by 43.7%compared to the AlCl_(3)/Et_(3)NHCl ratio of 1.4∶1.Using AlCl_(3)/LiCl/Et_(3)NHCl as the electrolyte and V_(2)O_(5) as the positive active material,a specific current of 31.2 mA/g is achieved,resulting in a battery discharge specific capacity of 98.1 mAh/g.After 175 cycles at a current density of 62.5 mA/g,the Coulomb efficiency consistently remained above 95%.Following the modification with ionic liquids,the solid electrolyte interphase(SEI)film resistance on the surface of the negative aluminum foil in the aluminum ion batteries increase significantly,while the charge transfer resistance associated with aluminum ion electrochemical reactions decrease markedly.Consequently,both the specific capacity and cycling stability of the aluminum ion batteries are significantly enhanced.

关 键 词：铝离子电池 AlCl_(3)/Et_(3)NHCl离子液体 LiCl改性 V_(2)O_(5) 

分 类 号：TM912[电气工程—电力电子与电力传动]