PEDOT is applied using Argonne's oxidative chemical vapor deposition technique, which uses gas to ensure the coating is applied to every particle of the cathode, forming a robust skin. The new coating, made with a conducting polymer called poly(3,4-ethylenedioxythiophene) (PEDOT), marks a breakthrough in lithium-ion battery technology since it fully and completely protects each particle of the cathode-inside and out-from reactivity with the electrolyte. High temperatures increase the speed of these reactions, compromising the electro-chemical performance of the battery itself. A cathode charged at high voltage generates oxygen, oxidizing the electrolyte, creating an unwanted film on the cathode and causing energy loss. The cathodes researchers were studying are metal oxides made of nickel, manganese and cobalt. Lithium batteries, used to power everything from electric cars to cell phones and computers, have been using a cathode coating technology for more than 15 years.īut it is not without limitations: It is only a partial coating, one that covers just a small part of the outside of the cathode particle and does not protect the cathode when operating at a high voltage or at high temperature. The initial experiment was conducted in Hong Kong: HKUST had the ideal set-up and was able to carry out the work under the laboratory's specifications. "This could significantly improve our experience with the devices we've come to rely on." "This is an incredibly exciting advancement," said Khalil Amine, Argonne distinguished fellow and head of the Technology Development group in the Electrochemical Energy Storage department within Argonne's Chemical Sciences and Engineering division. It was funded by the DOE's Office of Renewable Energy and Energy Efficiency, Vehicle Technologies Office. ![]() The idea, three years in the making, was developed at Argonne in collaboration with HKUST.
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