提出了一种利用挤出式3D打印技术制备纺织物结构的自支撑柔性锂离子电池电极的新方法。并采用高浓度的聚偏氟乙烯（PVDF）作黏度调节剂，碳纳米管（CNT）作导电剂，磷酸铁锂和钛酸锂作电极活性材料，配制了具有可打印性的"墨水"，其表观黏度接近10⁵ Pa·s，并且表现出明显的剪切变稀；同时此"墨水"的存储模量平台值也高达10⁵ Pa，其优异的流变学性质对于打印和固化过程十分有利。电化学测试结果表明，2种打印电极具有稳定且十分匹配的充放电比容量，因此由二者组装的软包袋装全电池也具有高达约108 mAh/g的放电比容量（50 mA/g），弯曲后，在同样的电流密度下其放电比容量保持在约111 mAh/g。

This paper provides a novel method to fabricate flexible free-standing electrodes with textile structure for lithium-ion batteries by applying extrusion-based three-dimensional (3D) printing technology.Using high concentration of polyvinylidene fluoride (PVDF) as viscosity modifier,carbon nanotube (CNT) as conducting agent,and lithium iron phosphate (LFP) and lithium titanium oxide (LTO) as active ingredients of cathode and anode respectively,the printable "inks" with obvious shear-thinning behavior are prepared.The apparent viscosity of the prepared "inks" can exceed 10⁵ Pa·s and its storage modulus plateau value is as high as 10⁵ Pa.Such excellent rheological properties are beneficial to the printing and solidification processes.It is demonstrated via the electrochemical test that both two kinds of printed electrodes exhibit stable and much matching charge and discharge specific capacities under the same current density of 50 mA·g^-1.To explore the feasibility of printed electrodes,a pouch cell with as-printed LFP and LTO electrodes as cathode and anode respectively is assembled.It is verified that this pouch cell before deformation delivers a discharge specific capacity of approximately 108 mAh·g^-1 under a current density of 50 mA·g^-1,and gives a tiny raise in discharge specific capacities to around 111 mAh·g^-1 for bend pouch cell under the same current density.

王一博(1985-),女,博士研究生,研究方向为3D打印锂离子电极,11b325010@hit.edu.cn