3D打印柔性可穿戴锂离子电池电极

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.