05
2024
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08
Direct Writing 3D Printing Equipment Prints Lithium Iron Phosphate Battery
Author:
Industry new knowledge
Recently, a team led by Shao, Huiping of Beijing University of Science and Technology, published a research entitled Preparation of lithium iron phosphate battery by 3D printing in Ceramics International,Lithium iron phosphate (LFP) porous electrode was prepared by 3D printing technology.
Original link: https://www.sciencedirect.com/science/article/abs/pii/S0272884224004164
Adventure Technology official website: http://www.adventuretech.cn/
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research content
In recent years, with the rapid development of portable electronic devices and implantable medical devices, the demand for miniaturized energy storage devices has been increasing. Lithium-ion batteries have become the leading technology in the field of energy storage batteries due to their excellent energy density and cycle stability.Lithium iron phosphate (LFP), as a kind of electrode material for lithium ion batteries, has attracted much attention because of its low cost, good stability and environmental protection.However, its low conductivity and slow diffusion rate limit its application in the energy battery industry.
Additive manufacturing (3D printing) creates 3D electrodes with precise pores through computer-aided design, has a high aspect ratio structure, shortens the ion diffusion distance, improves the battery energy density, and reduces material waste. In recent years, 3D printing has been successfully applied to a variety of battery manufacturing. Research has used graphene oxide, LFP positive electrode and Li-a Ti-o-a negative electrode material to manufacture a 3D printed interlaced lithium ion battery.
In this study, the LFP porous electrode was prepared by 3D printing, and its rheological properties and printability were studied by adjusting the LFP content in the slurry. The electrochemical performance of LFP porous electrode was tested, and its application prospect in lithium ion battery was evaluated.
Figure 1, schematic diagram of 3D printed LFP electrode.
Figure 2 shows the micromorphology and particle size distribution of the LFP powder in this study, with an average particle size of about 0.35 μm. The XRD pattern shows that LFP is pure, free of impurities, and does not undergo phase transition when combined with PVDF and AB.
2, Micromorphology (a), particle size distribution (B) and XRD pattern (c) of LFP powder and LFP electrode.
Figure 3, Rheological properties of slurries with different LFP contents. (A) The relationship between the apparent viscosity of 20-60 wt% LFP slurry and the shear rate. (B) G' and G "versus shear stress for 20-60 wt% LFP slurries. (c) Yield stress versus 20-60 wt% LFP slurry. (d) Storage modulus G' versus yield stress for 20-60 wt% LFP slurries.
Figure 4 shows that the printing paste with different LFP content can print the same shape of the electrode.
4, same shape electrodes with different LFP contents are printed. (a) 40 wt%,(B) 30 wt%, and (c) 20 wt%.
Figure 5, Microscopic images of 3D printed LFP electrodes, overall view (a), partial view (B), cross-sectional view (c), 60% -204 μm(d), 57% -245 μm(e) and 48% -134 μm(f) single hole and monofilament views, surface view and EDS mapping (g).
6, Electrochemical performance of printed LFP cells with different porosity and thickness. (a) Rate capability of printed LFP cells of different porosity and thickness. (B) Charge-discharge voltage curves of 60%-204 μm batteries at different rates. (C) Cycle performance of 60%-204 μm battery at 0.5 C and 2.8-4.2V. (D) Typical charge-discharge voltage curve of 60%-204 μm battery. (E) The cycle performance of the 60%-204 μm cell under a load of 15.9 mg cm-2 LFP. (F) Digital and SEM images of LFP electrodes removed from 60% to 204 μm cells after 200 cycles.
△ Figure 7,(a) CV curves of three printed LFP batteries between 2.6V and 4.4V, with a scan rate of 0.2 mV s − 1. (B) CV curves of 60%-204 μm cells at different scan rates. (C) The resistance of the 60%-204 μm battery in the fully discharged state at the 50th, 100 and 200 cycles. (D) Comparison of electrode load and weight energy density (Wh kg − 1) of printed LFP batteries with other reports.
research conclusion
In this study, LFP electrodes with different porosity and thickness were prepared by 3D printing technology.The results showed that the slurry apparent viscosity and yield stress increased as the LFP content increased from 20 wt% to 60 wt%. When the LFP content exceeds 40%, the paste has good shape-keeping and self-supporting properties, and the yield stress is lower at 40 wt%, and printing is easier. Electrochemical tests show that the LFP battery has a reversible discharge capacity of 121.7 mA h/g and an energy density of 350 W h/kg after 200 cycles at 0.5 C, showing high load, high energy density and good cycle stability. It is suitable for miniaturized energy storage devices of lithium ion batteries.
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