Cathode Active Material

Cathode active material inducing reversible phase transition with crystal water-containing manganese oxide

This technology incorporates crystal water into a manganese-based metal oxide cathode active material to induce a reversible phase transition between a thermodynamically stable phase (2D layered) and a metastable phase (3D structure) during charge and discharge. Furthermore, it enhances structural stability by placing metal dopants with high oxygen affinity (such as Al or Cu) between unit layers, thereby improving charge-discharge reversibility and cycle life.

Conventional layered cathode active materials suffer from manganese dissolution and irreversible structural changes (such as spinel transformation) during high-voltage charging, making it difficult to fully utilize their theoretical capacity and leading to a rapid decline in cycle life.

By forming chemical bonds between crystal water and manganese to create a 3D metastable phase, this technology implements a reversible phase transition mechanism that restores the original 2D layered structure during charge and discharge, ensuring the stable performance required for lithium secondary battery cathode materials.

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Key Features:

• A cathode active material comprising crystal water and a manganese-based metal oxide, featuring a first crystal phase with a 2D structure and a second crystal phase with a 3D structure.
• The first crystal phase consists of a manganese-based metal oxide composed of unit cells where manganese and oxygen are bonded.
• A configuration that incorporates crystal water into the manganese-based metal oxide to induce a reversible phase transition between a thermodynamically stable phase and a metastable phase.
• A cathode active material that includes crystal water to ensure structural stability and reversibility during charge and discharge.

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