Anode active material for lithium secondary batteries using lithium-titanium oxide and method for manufacturing the same

Monoclinic titanate anode material with reversible charge-discharge achieved through precise Li/Ti ratio adjustment

This technology implements a single-phase metal oxide, Li2-xTi1+xO3 (0 < x < 0.1), by precisely adjusting the Li/Ti ratio stoichiometrically. It overcomes the limitations of Li2TiO3, which previously hindered lithium-ion insertion and extraction, to achieve reversible charge-discharge reactions and a stable voltage plateau.

Conventional Li2TiO3-based anode active materials suffered from poor reversible lithium-ion insertion and extraction. This resulted in technical limitations, including the absence of a voltage plateau in charge-discharge curves and low discharge capacity.

This technology involves synthesizing Li2-xTi1+xO3 (ideally 0 < x ≤ 0.033) by mixing lithium and titanium sources and heat-treating them in an oxidizing atmosphere at 600–900°C to control the ratio of lithium to titanium within the crystal. Suitable for anodes in low-temperature, high-safety industrial batteries or smart grid auxiliary power sources where stable operating voltage is critical, it maintains a monoclinic structure while providing a distinct voltage plateau, significantly simplifying cell voltage management.

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Key Features:

• Anode active material containing a metal oxide that satisfies the formula Li2-xTi1+xO3 where 0 < x < 0.1
• Metal oxide particles with a monoclinic crystal structure and an average particle size of 0.1 to 1.5㎛
• Step of preparing a mixture by combining a lithium source, such as lithium carbonate, with a titanium source, such as titanium dioxide
• Heat treatment step of heating the mixture in an oxidizing atmosphere at 600 to 900°C for 3 to 7 hours to produce a metal oxide capable of lithium-ion insertion and extraction

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