PBI Separator Preparation Through Particle Size and Solubility Control
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Solution Overview
Problem
The low solubility of polybenzimidazole precursors in amide-based organic solvents hinders the efficiency of polybenzimidazole solution preparation and separator manufacturing, limiting the commercialization of polybenzimidazole-based separators due to reduced preparation and process efficiencies.
Innovation Solution
Improving the solubility of polybenzimidazole precursors by reducing their average particle size to 300 μm or smaller and dissolving them under elevated temperature (140° C. or higher) and pressure (0.1 MPa or higher) conditions in amide-based organic solvents, such as dimethylacetamide, to achieve a maximum solubility of 8 to 20% by weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polybenzimidazole precursor is dissolved in amide-based organic solvent under conventional conditions, then the separator can be manufactured, but the solubility is very low reducing preparation efficiency
Solution Approach 1:
The patent applies parameter changes by modifying the particle size of the polybenzimidazole precursor to 300 μm or smaller, which significantly improves solubility in amide-based organic solvents. This size reduction allows for better dissolution kinetics and higher concentration solutions, directly resolving the contradiction between solubility and preparation efficiency.
Solution Approach 2:
The patent implements preliminary action by pre-processing the polybenzimidazole precursor through size reduction to 300 μm or smaller before dissolution. This preliminary size control enables subsequent efficient dissolution under conventional solvent conditions, eliminating the need for extreme conditions and improving overall preparation efficiency.
2Ease of operation
If polybenzimidazole precursor with larger particle size is used, then the handling is easier, but the solubility and dissolution rate are reduced
Solution Approach 1:
The patent optimizes the particle size parameter to 300 μm or smaller, which represents the optimal balance point where the precursor maintains sufficient mechanical strength for handling while achieving significantly improved solubility and dissolution rate in amide-based organic solvents.
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 enhances the preparation efficiency of polybenzimidazole solutions and separators, resulting in improved ion exchange characteristics and stable secondary battery performance, even under harsh conditions.
Implementation Method 1
dissolving the PBI precursor in an amide-based organic solvent under a temperature condition of 140° C. or higher and/or a pressure condition of 0.1 MPa or higher
Data Source
AI summary
Disclosed is a method for preparing a polybenzimidazole solution, the method including: preparing a polybenzimidazole (PBI) precursor having an average particle size of 300 μm or smaller; and dissolving the PBI precursor in an amide-based organic solvent under a temperature condition of 140° C. or higher and/or a pressure condition of 0.1 MPa or higher.