A method for recycling valuable metals in waste lithium ion batteries based on a solvent circulation strategy

By employing a solvent recycling strategy for leaching and precipitation separation, the high reagent consumption and wastewater treatment issues in the recycling of decommissioned lithium-ion batteries using traditional hydrometallurgical processes have been resolved. This approach enables efficient and universally applicable recovery of valuable metals, resulting in both economic and environmental benefits.

CN120905518BActive Publication Date: 2026-07-21GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
Filing Date
2025-07-28
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Traditional hydrometallurgical processes for recycling retired lithium-ion batteries suffer from problems such as high reagent consumption, high cost, large wastewater treatment volume, poor applicability to cathode materials, and long processing time.

Method used

A solvent recycling strategy was adopted to leach waste lithium-ion battery cathode materials using an iodine-containing leaching agent. The oxidized iodine species were reduced by ferrous materials, thus realizing the recycling of the leaching solvent. Valuable metals were separated by precipitation through pH adjustment to obtain transition metal hydroxide precursors and lithium carbonate.

Benefits of technology

It achieves highly universal recycling of various lithium-ion battery types, reduces the amount of leaching solvent used, and reduces wastewater treatment volume, resulting in significant economic and environmental benefits.

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Abstract

The application relates to the technical field of lithium ion battery recycling, and discloses a method for recycling valuable metals in waste lithium ion batteries based on a solvent circulation strategy. The method comprises the following steps: S1, mixing waste lithium ion battery positive materials with iodine-containing leaching agents, and leaching to obtain a leaching solution; S2, reacting the leaching solution with ferrous materials, regenerating the iodine-containing leaching agents, and recycling the iodine-containing leaching agents to step S1 to repeatedly leach the waste lithium ion battery positive materials; S3, after multiple regeneration recycling and leaching, collecting a liquid phase part to obtain a valuable metal-rich leaching solution, removing iron ions through primary precipitation, collecting a liquid phase part to carry out secondary precipitation, carrying out solid-liquid separation, and obtaining transition metal hydroxide precursors and lithium-rich leaching solution; and S4, adding a sodium carbonate solution to the lithium-rich leaching solution, carrying out precipitation reaction, and obtaining lithium carbonate. The method has high universality for recycling retired lithium batteries and can almost cover all types of retired lithium batteries on the market.
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