Research on application technology of 3D printing technology to manufacture flexible all-fiber LR1130 battery

　　Traditional bulky and rigid power systems cannot meet the flexibility and breathability requirements of wearable devices. Despite significant efforts in developing various 1D energy storage devices that are sufficiently flexible, challenges remain in terms of scalability, cost, and efficiency of manufacturing.

　　【Achievements Introduction】

　　Recently, Professor Zhao Jiupeng of Harbin Institute of Technology, Associate Professor Hu Liangbing of the University of Maryland, Kun (Kelvin) Fu (joint correspondence) and others reported the application of scalable, low-cost, and high-efficiency 3D printing technology to manufacture flexible all-fiber LR1130 battery (LIB). . High-viscosity polymer inks containing carbon nanotubes and lithium iron phosphate (LFP) or lithium titanium oxide (LTO) are used to print LFP fiber cathodes and LTO fiber anodes, respectively. The two fiber electrodes exhibit good flexibility and high electrochemical performance in the half-cell. Full-fiber LIBs can be assembled by combining printed LFP and LTO fibers with gel polymers as quasi-solid electrolytes. The all-fiber device exhibits a high specific capacity of ≈110 mAhg-1 at a current density of 50 mAg-1 and maintains good flexibility of the fiber electrode, which can be used in future wearable electronic devices. The relevant results were published on Advanced Functional Materials under the title "3D-PrintedAll-FiberLi-IonBatterytowardWearableEnergyStorage".

　　[Picture and text introduction]

　　Design concept and manufacturing process schematic diagram of 3D printed full-fiber flexible LIB

　　a) 3D printing production process

　　b) Application of fiber-shaped batteries in wearable applications

　　Rheological properties of LFP/CNT/PVDF, LTO/CNT/PVDF inks and traditional LFP slurry inks

　　a) Surface viscosity of LFP/CNT/PVDF and LTO/CNT/PVDF inks as a function of shear rate

　　b) Storage modulus, G′ and loss modulus G′ as functions of shear stress

　　c) Conventional LFP slurry surface viscosity as a function of shear rate

　　d) Storage modulus, G′ and loss modulus G′ as a function of shear stress for conventional LFP slurry

　　e) Storage and loss modulus of LFP/CNT/PVDF ink as a function of time

　　f) Storage and loss modulus of LTO/CNT/PVDF ink as a function of time

　　Morphological characteristics of fibrous LFP electrodes

　　a) Optical image of wet fiber during printing process

　　b) Optical image of wet fibers removed from coagulation bath

　　c) Optical image of dry fiber

　　d,e) Optical images of pristine and drawn fibers

　　f) Fiber optics image with weight bearing

　　g) SEM image of LFP fiber

　　h) Cross-sectional view of LFP fiber

　　i) SEM image of a yarn composed of three LFP fibers

　　j) SEM image of polymer layer coated on yarn fibers

　　k) Magnified SEM image of gel electrolyte coating

　　l) Magnified cross-sectional SEM image of polymer coating on fiber

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