Coagulant-Tuned Acrylic Binder for High-Temperature Solid-State Batteries
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Solution Overview
Problem
All-solid-state secondary batteries face capacity reduction issues under high-temperature conditions, necessitating a binder composition that enhances high-temperature storage characteristics.
Innovation Solution
A binder composition for all-solid-state secondary batteries comprising an acrylic polymer and a specific amount of a coagulant, within the range of 500 to 5,000 mass ppm, is used to form a solid electrolyte-containing layer, improving the battery's high-temperature storage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional binder composition containing acrylic polymer is used to form a solid electrolyte-containing layer, then the battery can be manufactured with standard materials, but the battery exhibits capacity reduction under high-temperature conditions
Solution Approach 1:
The patent applies parameter changes by modifying the binder composition parameters - specifically adding a coagulant at 5-50 mass% relative to the acrylic polymer content, and controlling the acrylic polymer content at 1-10 mass% relative to the solid electrolyte. These parameter adjustments transform the binder composition to achieve both manufacturability and high-temperature capacity stability.
Solution Approach 2:
The patent creates a composite binder system by combining acrylic polymer with a coagulant (such as metal salts like aluminum chloride, ferric chloride, or zinc chloride). This composite material approach enhances the binder's performance at high temperatures while maintaining its binding function, thereby improving capacity stability without sacrificing manufacturability.
2Ease of manufacture
If the acrylic polymer content in the binder composition is increased to improve binding, then the layer formation becomes easier, but the high-temperature storage characteristics deteriorate
Solution Approach 1:
The patent optimizes the acrylic polymer content parameter to a specific range (1-10 mass% relative to solid electrolyte) and introduces a coagulant parameter (5-50 mass% relative to acrylic polymer). This dual-parameter optimization allows sufficient binding for easy layer formation while preventing the capacity reduction that occurs with excessive polymer content at high temperatures.
Solution Approach 2:
The coagulant acts as an intermediary substance that mediates between the acrylic polymer and the solid electrolyte. It enables the binder composition to achieve adequate adhesion for easy layer formation while simultaneously preventing the harmful effects of excessive polymer content at high temperatures, thus resolving the contradiction between manufacturability and reliability.
3Reliability
If a coagulant is added to the binder composition to improve high-temperature characteristics, then the capacity stability improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent manages complexity by defining specific parameter ranges: coagulant at 5-50 mass% relative to acrylic polymer, and acrylic polymer at 1-10 mass% relative to solid electrolyte. These quantified parameters simplify the manufacturing process by providing clear formulation guidelines, making the enhanced composition as manageable as conventional formulations.
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 proposed binder composition effectively forms a solid electrolyte-containing layer that enhances the high-temperature storage characteristics of all-solid-state secondary batteries, maintaining capacity over extended periods at elevated temperatures.
Implementation Method 1
adding a coagulant to the water dispersion of an acrylic polymer to cause coagulation of the acrylic polymer
Data Source
AI summary
Provided is a binder composition for an all-solid-state secondary battery with which it is possible to form a solid electrolyte-containing layer that can cause an all-solid-state secondary battery to display excellent high-temperature storage characteristics. The binder composition for an all-solid-state secondary battery contains an acrylic polymer and not less than 500 mass ppm and not more than 5,000 mass ppm of a coagulant relative to the acrylic polymer.