Positive electrode material
High performance positive electrode material
Cobalt hydroxide is generally used in the positive electrode as the conductive material, and as shown in the figure, it dissolves in an alkaline electrolyte and coats the surface of nickel hydroxide.
Cobalt hydroxide is oxidized on the first charge and changes to highly conductive cobalt oxyhydroxide, which plays a role in increasing the conductivity of the electrode.
Spherical nickel hydroxide
Oxidation of cobalt compounds in batteries
FDK's original technology
The features of our original active material are as follows.
- A special crystal structure that incorporates Na from chemical oxidation into the crystal structure
- High valence cobalt, that has excellent conductivity and durability
Cells using high conductivity cobalt compound coated nickel hydroxide have high performance such as a high capacity and high durability.
Results of valence analysis of surface Co compound layer by synchrotron radiation XAFS analysis
|Oxidization method||Co value coating on nickel hydroxide||Conductive|
|After electrode manufacturing||After cell charge and discharge||After cell charge and discharge|
|Co compound additive (Competitor)||Electrochemical oxidation||2.00||2.97||1x10-4/Ω・㎝|