石墨烯基水性导电油墨的制备及其在低温热管理中的应用  

Preparation of graphene-based water-based conductive ink and its application in low-temperature thermal management

作　　者：王友昌 张晓静[1,2] 朱宇薇 李筱璐 李宇航 沈志刚[1,2] WANG Youchang;ZHANG Xiaojing;ZHU Yuwei;LI Xiaolu;LI Yuhang;SHEN Zhigang(School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China;Beijing Key Laboratory for Powder Technology Research and Development,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]北京航空航天大学粉体技术研究开发北京市重点实验室,北京100191

出　　处：《中国粉体技术》2024年第6期15-26,共12页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:U23A20111。

摘　　要：【目的】为了制备环保型的石墨烯基水性导电油墨,印刷高性能柔性电阻加热器(flexible resistive heaters,FRHs),实现锂离子电池的低温热管理。【方法】采用球磨法制备石墨烯基水性导电油墨;采用扫描电子显微镜和透射电子显微镜表征石墨烯及印刷图案的形貌和结构;采用平板流变仪和四探针电阻仪表征炭黑含量对石墨烯基水性油墨流变性能和印刷图案导电性能的影响;探讨石墨烯基FRHs的响应速率、热稳定性和力学性能,以及其在锂离子电池低温热管理中的应用。【结果】油墨的静态黏度和黏度恢复率随着炭黑含量的增加而增大,印刷图案的电导率在炭黑质量分数为15%时达到最大,为20383 S/m;石墨烯基FRHs在8 V的低电压下30 s快速达到150℃,能够实现120次的重复开关循环,在72 h的持久运行后温度仅增加2.54%,并且在2000次的弯折后温度变化小于2.1%。在电压为6 V时将锂离子电池从-30℃预热至20℃,并在30 min内实现80%的充电容量。【结论】射流空化法产生的高剥离度、完好晶体结构和较大横向尺寸(1μm)的石墨烯与填充于其中的炭黑使油墨具有合适的流变性,并在印刷图案中构建致密的导电通道,赋予FRHs优异的性能。Objective Traditional metal heating films used for preheating lithium-ion batteries are often inflexible,dense,and susceptible to corrosion.In contrast,graphene-based flexible resistive heaters(FRHs),produced through screen printing,demonstrate great potential due to their outstanding conductivity,stability,and lightweight properties.However,replacing toxic,highboiling-point organic solvents with water remains a substantial challenge.To address this,this paper prepares an environmentally friendly graphene-based ink using a ternary mixed solvent composed of water,ethanol,and ethylene glycol.Methods High-quality graphene was initially prepared using the jet cavitation method,with its morphology and structure characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).A simple sand-milling method was then employed to produce graphene-based water-based ink with varying ratios of graphene and carbon black.A parallelplate rheometer and a four-probe resistivity meter were utilized to assess the rheological properties of the ink and the conductivity of the printed patterns.SEM was used to explore the mechanism by which carbon black influenced the conductivity of the printed patterns.Finally,graphene-based FRHs were fabricated through screen printing,and their electrothermal properties were tested.These FRHs were applied to low-temperature thermal management in lithium-ion batteries.Results and Discussion The size and quality of graphene had a significant impact on the rheological properties of the ink and the conductivity of the printed patterns.Graphene produced through jet cavitation method exhibited large lateral sizes(~1μm)and a high degree of exfoliation,as observed in TEM images.The symmetrical hexagonal patterns in electron diffraction images confirmed its excellent crystallinity.These characteristics contributed to its superior conductivity due to minimal obstruction to carrier mobility.However,the rigid connections between two-dimensional graphene sheets created numerous line con

关 键 词：石墨烯 水性油墨 丝网印刷 柔性电阻加热器 热管理 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ152[化学工程—电化学工业]