Anode material with improved lifespan and lithium secondary battery containing the same

Long-life anode material with gradual lithium replenishment via lithium compound refinement

This technology improves battery lifespan and capacity by refining lithium compound clusters that become irreversibly inactivated within the anode during repeated charge/discharge cycles. This process increases the contact area with reduced transition metals, allowing for the gradual replenishment of lithium ions within the cell.

Repeated charging and discharging of lithium-ion batteries typically leads to capacity loss and shortened lifespans due to lithium ion consumption caused by dendrite formation on the anode surface and the structural collapse of cathode materials.

This technology utilizes porous VF3 (vanadium trifluoride) nanoparticles (10–100 nm in size with 2–50 nm pores) as an anode material. When combined with a layered Li2NiO2 cathode and operated across a voltage range wider than the nominal range (4.2–4.3V charging, 3V discharging), it secures reversibility and replenishes internal lithium ions. This approach simplifies manufacturing processes and contributes to cost reduction in secondary battery anode production.

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Key Features:

• An anode comprising an anode material that includes porous transition metal compound nanoparticles of a defined chemical formula
• A cathode comprising a cathode material that includes a layered lithium transition metal oxide of a defined chemical formula
• A lithium secondary battery comprising a separator disposed between and separating the anode and the cathode
• A configuration in which the porous transition metal compound nanoparticles have pores ranging from 2 to 50 nanometers in size

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