Although experimental battery design schemes have made great progress, existing lithium-ion batteries still have a lot of room for improvement. Scientists at the Argonne National Laboratory have just developed a new cathode coating called PEDOT, which is characterized by allowing lithium-ion batteries to operate more safely and for longer. As we all know, a short board of lithium ion batteries is that the cathode will generate excessive oxygen during use and react with the electrolyte.
(From: Argonne National Laboratory)
This phenomenon will form a film on the surface of the cathode, resulting in a reduction in energy transfer between the two, which in turn affects the performance of the entire battery.
In order to alleviate this problem, most lithium-ion batteries will be covered with a special coating on the cathode, but often it will bring another problem-slow down the speed of lithium ions into and out, reducing the efficiency of the battery.
In addition, since it cannot cover the entire surface, degradation may still occur when the battery is operated at a higher temperature or voltage.
Research map-1: Difference between oCVD process and coating particle structure
The good news is that the new PEDOT coating developed by Argonne National Laboratory can cover every particle of the cathode in a lithium-ion battery to improve its service life.
The research team chose a conductive polymer called PEDOT to replace the traditional cathode coating. It was found that while protecting the cathode, PEDOT still allows the passage of lithium ions and electrons.
And because PEDOT is applied from the gas using oxidation chemical vapor deposition technology, it can cover each individual particle of the cathode, which is more comprehensive than the conventional coating.
Research map-2: The effect after the formation of PEDOT coating
It is reported that the new coating can increase the operating voltage of existing lithium-ion batteries from 4.2V to 4.6V. While reducing the cost of battery components, it can also effectively extend battery life and battery life.
Research author Khalil Amine said: "This is an incredible but exciting progress that is expected to greatly improve the experience of using the devices we rely on."
Research map-3: PEDOT cathode coating feature
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