摘要
【目的】电控离子交换(ESIX)作为一种新型的离子选择性分离和回收的技术,可以用于从盐湖中提取锂资源。其中,集流体与电活性复合膜之间的界面结合行为对复合膜的电控提锂性能具有重要的影响。【方法】以LiMn2O_(4)为电活性锂离子交换材料,并分别以钛板和石墨板为集流体制备了钛基和碳基复合膜电极。通过附着力测试探讨了集流体与复合膜的界面结合行为,并采用循环伏安、交流阻抗、恒流充放电测试分析了不同复合膜电极的电化学性能。【结果】结果表明:石墨板与复合膜之间的粘附强度(1.33N/cm)约为钛板(0.71N/cm)的2倍,且碳基复合膜电极表现出更优异的电化学性能。在10次连续的ESIX过程中,碳基复合膜电极具有更好的提锂性能。这是由于石墨板与复合膜之间具有更充分的粘结性,使两者之间显现出更杰出的界面导电性,从而增强了复合膜电极的电活性和循环稳定性。此外,钛板在多次氧化还原后表面生成的氧化膜会产生较大界面电阻,从而降低了钛板的导电性。
【Purposes】Electrochemically switched ion exchange(ESIX)is a novel technology for selective ion separation and recovery,which can be utilized for lithium extraction from salt lakes.In particular,the interfacial bonding behavior between the current collector and the electroactive composite film has an important influence on the electrochemical performance of the composite film.【Methods】Titanium and carbon-based composite film electrodes were prepared by using titanium plate and graphite plate as current collectors,respectively,with LiMn2O_(4) as electroactive Li-ion exchange material.The interfacial bonding behavior between the current collector and the composite film was discussed by adhesion test,and the electrochemical performance of different composite film electrodes were analyzed by cyclic voltammetry,AC impedance,and galvanostatic charge-discharge tests.【Findings】The results show that the adhesion strength between graphite plate and composite film(1.33 N/cm)is about twice that between titanium plate and composite film(0.71 N/cm),and the carbon-based composite film electrode exhibits better electrochemical performance.In addition,the carbon-based composite film electrode has better lithium extraction performance during 10 consecutive ESIX processes.The above results are attributed to the more sufficient adhesion between the graphite plate and the composite film,which leads to better interfacial conductivity,thereby enhancing the electroactivity and cycle stability of the composite film electrode.However,the oxide film formed on the surface of the titanium plate after multiple redox will produce a large interface resistance,thus weakening the conductivity of the titanium plate.
作者
张金凤
孙海东
张荣子
李娟
马彦军
张正
张志华
杜晓
郝晓刚
ZHANG Jinfeng;SUN Haidong;ZHANG Rongzi;LI Juan;MA Yanjun;ZHANG Zheng;ZHANG Zhihua;DU Xiao;HAO Xiaogang(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China;Academic Sinica,Qinghai Salt Lake Industry Group Company Limited,Geermu 816000,China)
出处
《太原理工大学学报》
CAS
北大核心
2024年第3期522-529,共8页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(U21A20303,22078217,U20A20141)。
关键词
集流体
钛板
石墨板
锰酸锂
电控离子交换
current collector
titanium plate
graphite plate
LiMn2O_(4)
electrochemically switched ion exchange
