Battery Electrode Sheet Recovery Without Pickling or Aluminum Contamination
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Solution Overview
Problem
Current battery recycling processes for positive electrode sheets involve pickling, which leads to safety hazards, increased impurity content, and higher costs due to the incorporation of aluminum fragments and powder, making subsequent impurity removal difficult.
Innovation Solution
A recycling process that omits pickling, using shearing, drying, cold treatment, rolling, and sieving to separate positive electrode materials from aluminum foil, followed by roasting to produce a high-purity positive electrode powder, reducing aluminum content and improving separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pickling pretreatment is carried out to separate positive electrode material from aluminum foil, then separation efficiency is improved, but aluminum fragments and powder are incorporated into the positive electrode particles, increasing impurity content and difficulty of subsequent impurity removal
Solution Approach 1:
The patent changes the physical parameters of the aluminum foil by controlling the degree of crushing and sieving. By optimizing the mesh size and crushing intensity, the process separates aluminum foil into different size fractions, allowing coarse aluminum particles to be removed while preventing fine aluminum powder from contaminating the positive electrode material.
Solution Approach 2:
The patent segments the aluminum foil into different size categories through multi-stage crushing and sieving processes. Coarse aluminum particles are separated and removed, while the fine aluminum powder is prevented from mixing with the positive electrode material through controlled processing parameters and separation techniques.
2Productivity
If pickling is performed to dissolve aluminum on waste positive electrode sheet, then separation of positive electrode material and aluminum foil is strengthened, but flammable and explosive hydrogen is generated, creating safety hazards
Solution Approach 1:
The patent replaces the chemical pickling process with a mechanical separation system consisting of crushing, sieving, and physical separation equipment. This mechanical approach achieves aluminum foil separation without chemical reactions that generate hydrogen gas, thereby eliminating the associated safety hazards while maintaining recycling efficiency.
3Productivity
If acid treatment is applied to waste positive electrode sheet, then aluminum foil separation is improved, but the aluminum foil becomes thinner and more brittle, increasing voids and fine particles that cannot be intercepted by sieving
Solution Approach 1:
The patent optimizes the physical processing parameters including crushing intensity, sieving mesh size, and processing sequence. By carefully controlling these parameters, the process achieves effective aluminum foil separation while maintaining the structural integrity of the positive electrode material particles and preventing excessive generation of fine aluminum powder that would be difficult to separate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces aluminum content in the positive electrode material, enhances separation efficiency, and lowers costs by avoiding the incorporation of aluminum fragments and powder, while minimizing the use of solvents and reducing the risk of hydrogen generation.
Implementation Method 1
drying
Implementation Method 2
cold treating
Implementation Method 3
roasting the first positive electrode material and the second positive electrode material to obtain a positive electrode powder
Data Source
AI summary
Disclosed in the present invention is a recovery process for a waste battery electrode sheet, the method comprising the following steps: subjecting a waste battery electrode sheet to shearing, drying and cold treatment, and then rolling and screening same to obtain a first positive electrode material and a first waste electrode sheet; subjecting the first waste electrode sheet to shearing, drying and cold treatment, and then rolling and screening same to obtain a second positive electrode material and a second waste electrode sheet; and roasting the first positive electrode material and the second positive electrode material to obtain a positive electrode powder. In the present invention, the aluminum content in the positive electrode material is reduced by means of step-by-step shearing, and the adhesion performance of a waste positive electrode plate binder is then reduced by means of vacuum freeze-drying and spraying with a quick-cooling agent. The aluminum foil of the positive electrode material does not easily break when being broken after vacuum freeze-drying, and the morphology and output of the aluminum foil after primary shearing and secondary shearing are basically unchanged.