New method developed by the United States: Lithium-ion batteries can be printed in almost any shape!

Guide

Recently, researchers from Duke University and Texas State University have developed a new method for 3D printing lithium-ion batteries of almost any shape.

background

Lithium ion battery is a kind of rechargeable battery. It mainly relies on the movement of lithium ions between the positive and negative electrodes to work. In the process of charging and discharging, Li + intercalates and deintercalates between the two electrodes: when charging, Li + deintercalates from the positive electrode, intercalates into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

Electric vehicles and most electronic devices, such as mobile phones and laptops, are powered by lithium-ion batteries.

To date, manufacturers have to design their equipment based on commercially available lithium-ion batteries.

Innovation

However, technological innovation has changed this situation. Recently, researchers from Duke University and Texas State University have developed a new method for 3D printing lithium-ion batteries of almost any shape.

Their research results were published in the internationally renowned journal "ACS Applied Energy Materials" under the American Chemical Society.

technology

At present, most lithium-ion batteries on the market are cylindrical or cubic. Therefore, when a manufacturer designs a product, such as a mobile phone, a specific size and shape must be prepared for the battery, which wastes space and limits the design scheme.

Theoretically, 3D printing technology can produce the entire device in almost any shape, including batteries and electronic component structures. However, the polymers used in 3D printing, such as polylactic acid (PLA), are not ionic conductors, which has become a major obstacle to printing batteries. Christopher Reyes, Benjamin Wiley and colleagues have developed a process that can print lithium-ion batteries through a low-cost 3D printer.

The researchers improved the ion conductivity of polylactic acid by adding electrolyte solution. In addition, they doped graphene and multi-walled carbon nanotubes in the anode and cathode respectively.

value

In order to demonstrate the performance of the battery, the team 3D printed an LED bracelet with integrated lithium-ion battery. The bracelet battery can power a green LED light for 60 seconds.

future

According to researchers, the capacity of the first-generation 3D printed batteries is two orders of magnitude lower than that of commercial batteries. This capacity is so low that this 3D printed battery cannot be practically used. However, the researchers claim that they already have several ideas for increasing the capacity, such as replacing polylactic acid-based materials with 3D printed dough.

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