Cathode Coating (IN-09-061)
Cathode Coating Enables Faster Battery Charging, Discharging
Charge and discharge capacity of pristine, 250°C dry air and 250°C He/5%H2 heated Li1.12Mn0.55Ni0.145Co0.1O2, showing better performance for the material heated with reducing gas
A team of scientists at Argonne National Laboratory has developed a special coating for the cathodes used in lithium batteries. With the coating, batteries charge and discharge more quickly, without a loss in performance.Description
Under the direction of inventors Khalil Amine, Ilias Belhourak, and Ali Abouimrane, a group of Argonne researchers formulated coatings by using two discrete processes. In the first, an electro-active material is heated and exposed to a reducing gas to form a surface-treatment layer on the electro-active material. The reducing gas consists of hydrogen, carbon monoxide, carbon dioxide, and an alkane, alkyne, or alkene. The process also includes introducing an inert gas with the reducing gas. The surface-treated, electro-active material may be used in a variety of applications, such as in rechargeable lithium batteries.
The second process involves mixing an electro-active material and a reducing agent to form a surface treatment layer on the electro-active material and then removing the reducing agent. Removal includes vacuuming, filtering, or heating. The reducing agent is hydrazine, NaH, NaBH4, LiH, LiAlH4, CaH2, oxalic acid, formic acid, diisobutylaluminium hydride, zinc amalgam, diborane, sulfites dithiothreitol, or Sn/HCl, Fe/HCl. The partially reduced electro-active material can be used in a variety of applications, such as rechargeable lithium batteries, primary lithium batteries, or secondary lithium batteries.Benefits
- Increased electrical conductivity of cathode materials
- Faster charging and discharging without performance loss
Coatings for electrodes used in batteries for such purposes as
- Electric and plug-in hybrid electric vehicles
- Portable electronic devices
- Medical devices
- Space, aeronautical, and defense-related devices
|Title and Abstract||
A process for forming a surface-treatment layer on an electroactive material includes heating the electroactive material and exposing the electroactive material to a reducing gas to form a surface-treatment layer on the electroactive material, where the surface-treatment layer is a layer of partial reduction of the electroactive material.
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