Method for manufacturing lithium nickel manganese composite oxide for lithium secondary batteries

Method for producing lithium nickel manganese oxide by incorporating nickel through quenching of spinel-layered composites

This technology improves electrochemical activity by heat-treating a composite of a spinel structure (LiNi0.5Mn1.5O4) and a layered structure (Li2MnO3) at high temperatures followed by quenching, which induces nickel—now less soluble in the spinel phase—to incorporate into the layered structure.

Conventional methods for producing spinel-layered composites often rely on natural cooling, which can leave residual rock-salt phases or cause structural and compositional instability, leading to reduced electrochemical activity and lower energy density.

By applying a process that involves heat-treating the spinel-layered composite at 700–900°C followed by rapid cooling (quenching) outside the furnace, this technology can be applied to improve the stability and cycle life of secondary batteries.

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Key Features:

• Step of preparing a composite of spinel-structured lithium nickel manganese oxide and layered-structured lithium manganese oxide
• Step of pulverizing the prepared spinel-layered composite to reduce particle size
• Step of heating the pulverized composite to a temperature between 700 and 900°C, followed by cooling via a quenching process
• Configuration that induces nickel, which has reduced solubility in the spinel phase, to incorporate into the layered structure

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