Plasticized PVDF Binder for Battery Electrode Ion Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current PVDF binders in electrode fabrication for batteries are not suitable for enhancing conductivity and ion diffusion, leading to impaired rate performance and cyclability, and existing plasticizers do not effectively address these issues.
Innovation Solution
An electrode slurry comprising 60 wt.% to 98 wt.% electrode active material, 0 wt.% to 20 wt.% conductive carbon, and 1 wt.% to 20 wt.% of a plasticized binder, where the plasticized binder includes polyvinylidene fluoride (PVDF) and a plasticizer such as tetraglyme, diglyme, or triglyme, is used, improving connectivity and electrochemical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PVDF binder is used in electrode fabrication, then the electrode structure is maintained, but the conductivity and ion diffusion are insufficient leading to impaired rate performance and cyclability
Solution Approach 1:
The patent applies parameter changes by modifying the PVDF binder through plasticization with carbon disulfide (CS2). This chemical treatment alters the physical and chemical parameters of the PVDF, enhancing its conductivity and ion diffusion properties. The plasticized PVDF maintains its binding function while acquiring improved electrochemical performance, directly resolving the contradiction between structural maintenance and enhanced conductivity/ion diffusion.
Solution Approach 2:
The patent creates a composite material system by combining PVDF with carbon disulfide to form plasticized PVDF. This composite approach integrates the structural stability of PVDF with the enhanced conductivity and ion diffusion properties introduced by CS2 plasticization, achieving both mechanical integrity and improved electrochemical performance simultaneously.
2Reliability
If existing plasticizers are used with PVDF binder, then some improvement is achieved, but the issues of conductivity and ion diffusion are not effectively addressed
Solution Approach 1:
The patent specifically selects carbon disulfide (CS2) as the plasticizer, which undergoes parameter changes through its interaction with PVDF. The CS2 plasticization process modifies the molecular structure and physical properties of PVDF, fundamentally changing its conductivity and ion diffusion characteristics. This specific parameter change approach effectively addresses the limitations of conventional PVDF and existing plasticizers.
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 use of a plasticized PVDF binder in the electrode slurry enhances the rate capability and cyclability of electrodes, providing improved electrochemical performance and facilitating a more efficient fabrication process.
Implementation Method 1
the plasticized binder includes polyvinylidene fluoride (PVDF) and a plasticizer such as tetraglyme, diglyme, or triglyme
Data Source
AI summary
The presently claimed invention relates to a plasticizer for polyvinylidene fluoride (PVDF), which is used as a binder for electrode fabrication.