Cathode material for secondary batteries and manufacturing method thereof

Cathode material with stabilized oxygen redox via transition metal lattice bandgap engineering

This technology stabilizes the atomic bonding structure in layered cathode materials by adjusting the HOMO-LUMO energy bandgap of the transition metal lattice or by mitigating vibronic coupling through doping and process control.

In layered cathode oxides, the Pseudo Jahn-Teller effect causes structural instabilities such as displacement of central atoms, bond length imbalances, and lattice rotation, which lead to capacity loss and degradation during repeated charge and discharge cycles.

This technology offers broad application potential in the research and development of lithium secondary battery cathode materials by providing a second oxide, derived from a first oxide, that features an increased HOMO-LUMO bandgap or reduced vibronic coupling strength through elemental doping.

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Key Features:

• A cathode material comprising a second oxide generated by increasing the energy bandgap between the HOMO and LUMO orbitals of the first lattice that constitutes the transition metal layer of a first oxide.
• A configuration where d-orbital electrons in the transition metal layer lattice of the second oxide are adjusted to reside in the LUMO orbital.
• A configuration that adjusts the bandgap of the transition metal lattice or mitigates vibronic coupling within layered cathode materials.
• A cathode material that stabilizes oxygen redox reactions by ensuring lattice stability through doping and process control.

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