Cathode Material for Lithium Secondary Batteries Containing Heterometal-Substituted Lithium-Manganese Oxide and Manufacturing Method Thereof

Li2MnO3 Cathode Material with Stabilized Lattice via Simultaneous Chromium-Vanadium Substitution and Co-precipitated Precursors

This technology improves electrochemical performance by substituting chromium (Cr) and vanadium (V) into the lithium-manganese oxide (Li2MnO3) structure at specific molar ratios to ensure lattice stability, and by manufacturing precursors through a co-precipitation method.

Conventional layered lithium-manganese oxides suffer from structural instability, leading to degraded cycle performance. Spinel structures also face limitations in capacity compared to lithium-cobalt-based materials.

This technology targets a composition of Li2[Mn1-(x+y)CrxVy]O3 (0<x<0.25, 0<y<0.25). It involves adjusting a chromium-vanadium metal salt solution from pH 9–13 to pH 2–6, mixing it with a manganese salt, and using a reducing agent to co-precipitate the precursor, followed by a two-stage calcination process for crystallization. Suitable for material companies developing high-capacity lithium-rich cathodes or cobalt-free EV batteries, the dual-element substitution stabilizes the lattice, providing a design basis for mitigating the cycle degradation typical of manganese-based materials.

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Key Features:

• A cathode active material containing a metal oxide represented by the chemical formula Li2[Mn1-(x+y)CrxVy]O3, where x and y are each greater than 0 and less than 0.25.
• Preparing a first metal salt solution containing chromium and vanadium compounds with a pH level between 9 and 13.
• Adjusting the pH of the first metal salt solution to between 2 and 6, then mixing it with a second metal salt solution containing manganese salt.
• Adding a reducing agent to the mixed solution to obtain [Mn1-(x+y)CrxVy]OH metal oxide precursor particles through co-precipitation.

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