Anode material for aqueous lithium secondary batteries and manufacturing method thereof

LiV3O8 Anode Material for Aqueous Batteries with Suppressed Vanadium Dissolution via AlF3 Fluoride Coating

This technology forms a metal fluoride (MeFx) coating layer, such as AlF3, on the surface of LiV3O8 anode active materials. This ensures structural stability in aqueous electrolytes, suppresses vanadium ion dissolution and side reactions, and improves ionic conductivity.

When using aqueous electrolytes, LiV3O8 anodes suffer from low electronic conductivity and irreversible structural changes during charge and discharge. Furthermore, the dissolution of vanadium ions into the electrolyte and the accumulation of side-reaction products lead to poor cycle performance and rapid capacity degradation.

This technology applies an AlF3 coating to the surface of LiV3O8 particles, maintaining a coating amount of 0.1–3 wt% through drying at 130–140°C and calcination in an argon atmosphere at 300–500°C to block direct contact with the electrolyte. Applicable to non-flammable aqueous batteries for home and industrial storage and safety-critical wearable power sources, it expands options for low-cost, long-lasting aqueous battery anode design without organic electrolytes.

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Key Features:

• Mixing the LiV3O8 anode active material with a metal fluoride (MeFx) precursor solution to obtain a mixed solution
• Drying the mixed solution at 130 to 140°C for 30 minutes to 2 hours to obtain a dried product
• Calcining the dried product in an argon atmosphere at 300 to 500°C for 1 to 3 hours
• AlF3 coating layer formed on the particle surface at 0.1 to 3 wt% relative to the LiV3O8 particles

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