Polyalkylene Oxide Binder for All-Solid-State Battery Ion Conductivity
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Solution Overview
Problem
All-solid-state lithium secondary batteries exhibit insufficient battery capacity and cycle characteristics due to inadequate ion conductivity in the solid electrolyte and active material layers, necessitating an improvement in battery performance.
Innovation Solution
A binder for all-solid-state secondary batteries is developed using a binder polymer obtained by polymerizing or copolymerizing a monomer composition containing a polyalkylene oxide-based monomer, which is used to form a solid electrolyte layer, enhancing the battery's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer solid electrolyte is used, then the battery can be assembled, but the battery exhibits insufficient ion conductivity and poor cycle characteristics
Solution Approach 1:
The patent uses a composite binder system consisting of polyacrylic acid and polyethylene glycol in specific weight ratios (0.1-10:1-100). This composite material combines the binding functionality of polyacrylic acid with the ion-conducting properties of polyethylene glycol, achieving both structural integrity and high ion conductivity in the solid electrolyte layer, thereby improving both reliability and cycle characteristics
2Object-affected harmful factors
If an inorganic solid electrolyte is used, then safety is improved, but battery capacity and cycle characteristics remain insufficient
Solution Approach 1:
The patent optimizes the molecular weight and weight ratio of polyethylene glycol in the binder system. By adjusting these parameters, the solid electrolyte layer achieves enhanced ion conductivity and battery capacity while maintaining the safety benefits of inorganic solid electrolyte materials, resolving the contradiction between safety and performance
3Ease of manufacture
If a conventional binder is used in the solid electrolyte layer, then the layer can be formed, but ion conductivity and energy density are insufficient
Solution Approach 1:
The polyethylene glycol component serves multiple functions: it acts as a binder to hold the solid electrolyte layer together, simultaneously provides ion conduction pathways, and enhances energy density. This multi-functional binder system eliminates the need for separate components, achieving both ease of manufacture and high performance
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 binder polymer improves the battery's performance by increasing ion conductivity and energy density, resulting in better battery characteristics and cycle retention.
Implementation Method 1
insufficient ion conductivity in a solid electrolyte layer
Implementation Method 2
a binder polymer obtained by polymerizing or copolymerizing a monomer composition containing a polyalkylene oxide-based monomer
Implementation Method 3
a binder polymer obtained by polymerizing or copolymerizing a monomer composition containing a polyalkylene oxide-based monomer
Data Source
AI summary
This binder for all-solid-state secondary batteries contains a binder polymer which is obtained by polymerizing or copolymerizing a monomer composition that contains a polyalkylene oxide-based monomer.