Regeneration method and application of silicon-carbon negative electrode material of waste lithium ion battery

Through a series of chemical and physical treatment steps, the silicon carbon anode material of waste lithium-ion batteries is successfully converted into high-quality recycled materials, solving the stability and difficulty of recycling of materials during the circulation process, achieving efficient regeneration and recycling of materials, and promoting the sustainable development of the battery industry.

CN119706825AActive Publication Date: 2025-03-28ZHEJIANG XINSHIDAI ZHONGNENG RECYCLING TECH CO LTD
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Patent Information

Application Number
CN202411913338.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28
Estimated Expiration
2044-12-24

AI Technical Summary

Technical Problem

The silicon carbon anode material of waste lithium-ion batteries will expand in volume during the charge and discharge cycle, resulting in rupture and powderization, and it will be difficult to recycle and use, affecting the use of environment and resources.

Method used

By mixing the silicon-carbon negative electrode material of the used lithium-ion battery with alkaline substances, calcining under a non-oxidizing atmosphere, then washing and separating the graphite material and the silicon-containing solution, adjusting the pH to precipitate silicic acid, calcining to form sub-oxide, and forming a regenerated silicon-carbon negative electrode material through carbon coating treatment.

Benefits of technology

It has achieved efficient recycling and reuse of waste silicon-carbon anode materials, significantly improved the structural stability and electrochemical performance of the materials, reduced recycling costs, and promoted the sustainable development of the lithium-ion battery industry.

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Abstract

The invention discloses a waste lithium ion battery silicon-carbon negative electrode material regeneration method and application thereof, and the method comprises the following steps: S1, mixing a waste lithium ion battery silicon-carbon negative electrode material with an alkaline substance, and calcining in a non-oxidizing atmosphere to obtain a calcined mixture; s2, washing the calcined mixture to be neutral, and performing solid-liquid separation to obtain a graphite material and a silicon-containing solution; s3, adjusting the pH value of the silicon-containing solution to a level at which silicate is precipitated, reacting under heating, carrying out solid-liquid separation, and collecting silicic acid precipitate; s4, mixing the silicic acid precipitate with a silicon simple substance, grinding the mixture into micron-scale powder, calcining the micron-scale powder under a vacuum condition, and collecting generated silicon monoxide; and S5, carrying out carbon coating treatment on silicon monoxide and the graphite material prepared in the step S2 to obtain the regenerated silicon-carbon negative electrode material. According to the scheme, the waste silicon-carbon negative electrode material is successfully converted into a high-quality regenerated material, and the material can be directly applied to production and manufacturing of new batteries.
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