Method for Manufacturing Cathode Active Material

Method for Manufacturing Cathode Materials Inducing Reversible Phase Transition in Layered Lithium Manganese Oxide Containing Crystal Water

This technology involves the production of a two-dimensional layered lithium manganese oxide containing crystal water (H2O). By inducing a reversible phase transition between a thermodynamically stable phase (layered) and a metastable phase (spinel-like structure) during lithium-ion insertion/extraction during charge/discharge cycles, it achieves both structural stability and high capacity.

Conventional layered cathode active materials have faced challenges such as difficulty in reaching theoretical capacity and reduced cycle life due to irreversible structural changes that occur during alkali ion extraction.

By synthesizing sodium manganese oxide and performing ion exchange in a lithium precursor aqueous solution to produce lithium manganese oxide containing crystal water (Li_xMnO_2·yH_2O, 0.23≤x≤1, 0.01≤y≤0.5), this technology enhances both the performance and commercial viability of lithium secondary battery cathode materials.

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Key Features:

• Synthesizing sodium manganese oxide using a manganese precursor to form the cathode active material
• Reacting the sodium manganese oxide with a lithium precursor to synthesize lithium manganese oxide
• Forming a layered structure containing crystal water through sodium-lithium ion exchange in a lithium precursor aqueous solution
• Configuration that induces a reversible phase transition between a thermodynamically stable phase and a metastable phase using two-dimensional layered lithium manganese oxide containing crystal water

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