Positive electrode active material doped with iron, preparation method thereof, and lithium secondary battery

Lithium manganese oxide positive electrode active material with improved stability through iron doping

This technology is about the manufacturing method of iron-doped cathode active material.

Among the cathode materials used in lithium-ion batteries, LiMn2O4 (LMO) is a promising material because it is environmentally friendly and inexpensive, but has the disadvantage of having an unstable structure, causing manganese to dissolve into the electrolyte. To improve these problems, this technology proposes a method of doping iron into lithium manganese oxide.

The cathode active material according to this technology can improve structural stability and electrochemical properties by doping iron into lithium manganese oxide, and is environmentally friendly by using relatively inexpensive iron, while also having an economical advantage in manufacturing cost, which is expected to contribute to improving the competitiveness of the secondary battery industry.

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Key Features:

• The core principle is a lithium manganese metal oxide with the chemical formula LiFexMn2-xO4 satisfying 0 < x ≤ 0.4 in Chemical Formula 1 above.
• Preparation of a cathode active material precursor using a hydrothermal synthesis method.
• Heat treatment by adding an iron precursor and a lithium precursor to the cathode active material precursor.
• The iron precursor is added in a molar amount of more than 0% to 20% relative to the molar amount of manganese.

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This technology was developed through support from the National Research Foundation of Korea's functional interface structure research project for lithium cathode-based high-capacity energy storage.

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