High-Nickel Slurry Storage with pH Rise Suppression
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Solution Overview
Problem
The pH value of aqueous slurries containing high nickel materials tends to rise over time, leading to alkalization and deterioration of physical properties, which can corrode current collectors and hinder coating processes in lithium ion secondary battery production, while existing methods face environmental and cost challenges due to the use of organic solvents.
Innovation Solution
A slurry storage device equipped with a pH value rise suppressing unit, utilizing pressurized gas, dry air, or decompression to inhibit moisture ingress and neutralize alkalinity, maintaining stable slurry properties for extended storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If aqueous slurry containing high nickel material is stored for extended periods, then storage duration is improved, but pH value rises causing alkalization and deterioration of physical properties
Solution Approach 1:
The patent applies preliminary anti-action by adding a pH adjusting agent to the aqueous slurry before storage to counteract the anticipated pH rise. The agent is selected to have neutralizing capability against alkalization, and the slurry is adjusted to a specific pH range (6.5-7.5) in advance to prevent deterioration during storage periods exceeding 24 hours.
Solution Approach 2:
The patent implements parameter changes by controlling the pH value within a specific range (6.5-7.5) and adjusting it to a target value (7.0±0.5) before storage. This parameter control prevents alkalization and maintains slurry stability during extended storage, directly addressing the pH rise issue.
2Ease of manufacture
If organic solvents are used in slurry production, then slurry preparation is improved, but environmental load and treatment costs increase
Solution Approach 1:
The patent replaces organic solvents with water as the dispersion medium, fundamentally changing the chemical composition parameter. This substitution eliminates the environmental pollution and health hazards associated with organic solvents while maintaining slurry preparation effectiveness through proper pH control and the use of appropriate binders and dispersants in aqueous systems.
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
The solution effectively suppresses pH value increases, ensuring stable storage of high nickel slurry for prolonged periods, facilitating handling and reducing environmental impact and production costs in lithium ion battery manufacturing.
Implementation Method 1
a pH value rise suppressing unit that suppresses a rise in a pH value of the aqueous slurry containing the high nickel material
Data Source
AI summary
A slurry storage device that stores an aqueous slurry containing a high nickel material prepared by a dispersion device which mixes a powder and a solvent, the device includes a holding unit that holds the aqueous slurry, and a pH value rise suppressing unit that suppresses a rise in a pH value of the aqueous slurry.