Although the experimental battery design has made great progress, there is still much room for improvement in the existing lithium-ion batteries. Scientists at Argonne National Laboratory have just developed a new cathode coating called PEDOT that allows lithium-ion batteries to operate more safely and for long periods of time. It is well known that a short plate of lithium-ion batteries produces excess oxygen during use and reacts with the electrolyte.
(from Argonne National Laboratory)
This phenomenon creates a film on the cathode surface, resulting in a reduction in energy transfer between the two, which in turn affects the performance of the entire battery.
To alleviate this problem, most lithium-ion batteries have a special coating on the cathode, but often bring another problem — slowing down the flow of lithium ions and reducing the efficiency of the batteries.
In addition, degradation can still occur when the battery is operating at higher temperatures or voltages because it cannot cover the entire surface.
Study illustration – 1: oCVD process and coating particle structure difference
The good news is that a 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 team chose a conductive polymer called PEDOT instead of a traditional cathode coating, and found that while protecting the cathode, PEDOT still allowed lithium ions and electrons to pass through.
And because PEDOT is applied from the gas using oxidizing chemical vapor deposition technology, it is able to cover every individual particle of the cathode, performing more comprehensively than conventional coatings.
Study Illustration – 2: Effect after PEDOT coating formation
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 battery component costs, it also extends device life and battery life.
“This is an incredible but exciting step forward that promises to dramatically improve the experience of using the devices we rely on,” said study author Khalil Amine.
Study Illustration – 3: PEDOT Cathodic Coating Close-up
Details of the study have been published in the recently published journaladvanced energy materials and nature, with the headline:
“Boosting Superior Lithium Storage Performance of Alloy-Based Anode Materials via Ultraconformal Sb Coating-Derived Rye-Solid-Solid Eby Interphase”
“Building ultra-ultra-ultra-harmony layers on both secondary and primary particles of the layered lithium transition metal oxide cathodes”