Electrolyte-Free Electrode for Ion-Conducting Binder Evaluation
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Solution Overview
Problem
Conventional methods for evaluating ion-conducting binders in lithium-ion batteries are limited by compatibility issues with liquid electrolytes, formation of solid electrolyte interphases, wettability, and thermal/chemical stability, which hinder accurate assessment of ion conductivity and lead to capacity degradation due to electrode expansion and contraction.
Innovation Solution
An electrolyte-free electrode system is developed, where ion diffusion occurs solely through particle contact, allowing for the evaluation of ion-conducting binders in an all-solid-state battery configuration without electrolyte components, using a binder with an ion-conducting component and functional groups in a polymer structure to enhance ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid electrolyte-based battery system is used for evaluating ion-conducting binder, then ion conductivity can be assessed, but evaluation accuracy is limited due to compatibility issues, SEI layer formation, wettability, and thermal/chemical stability
Solution Approach 1:
The patent extracts and removes the liquid electrolyte component from the battery system, creating an electrolyte-free all-solid-state battery configuration. This allows the ion-conducting binder to be evaluated in isolation without the confounding factors of liquid electrolyte compatibility, SEI layer formation, and wettability issues, thereby improving measurement precision and reliability of binder performance assessment
Solution Approach 2:
The patent changes the physical state parameter of the electrolyte from liquid to solid, and ultimately eliminates it entirely by using an electrolyte-free all-solid-state battery system. This parameter change transforms the evaluation environment to eliminate thermal and chemical stability issues associated with liquid electrolytes, enabling more reliable binder assessment
2Stability of the object's composition
If conventional inert binder is used to maintain strong binding between active material particles, then electrode structural stability is improved, but electron or ion movement between particles is inhibited
Solution Approach 1:
The patent changes the functional properties of the binder by introducing ion-conducting capabilities through polymer selection and lithium salt incorporation. This transforms the binder from an inert structural component to an active ion transport medium, enabling simultaneous maintenance of structural stability and promotion of ion movement without energy loss
Solution Approach 2:
The patent creates a composite binder system combining polymer matrices (such as polyacrylonitrile, polyvinylidene fluoride) with lithium salts (such as lithium perchlorate, lithium tetrafluoroborate). This composite structure provides both the mechanical binding function and the ion-conducting pathway, resolving the contradiction between structural stability and ion transport efficiency
3Quantity of substance
If binder content in electrode is minimized to maximize energy density, then energy density is improved, but ion transport pathways are reduced
Solution Approach 1:
The patent changes the functional density of the binder by incorporating high-ion-conductivity lithium salts into the polymer matrix. This increases the ion transport capability per unit volume of binder, allowing minimal binder content to provide sufficient ion pathways while maintaining high energy density
Solution Approach 2:
The ion-conducting binder serves dual functions: it provides structural binding between particles and simultaneously creates self-sufficient ion transport pathways through its intrinsic ion-conducting properties. This eliminates the need for separate electrolyte components, allowing minimal binder content to fulfill both structural and transport requirements
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 approach enables reliable evaluation of ion conductivity and performance comparison between ion-conducting and non-ion-conducting binders, facilitating the development of high-energy density and fast-charging electrodes by minimizing interface resistance and promoting lithium ion diffusion.
Implementation Method 1
ion transport in the electrode is dependent on a mechanism of ion diffusion between the electrode active materials by excluding an electrolyte component from the electrode
Data Source
AI summary
An all-solid-state battery for an ion-conducting binder evaluation system for a secondary battery may comprise: an electrode manufactured with an electrode composition, which includes electrode active materials and a binder, so that ion transport in the electrode is dependent on a mechanism of ion diffusion between the electrode active materials by excluding an electrolyte component from the electrode; a counter electrode disposed to face the electrode; and a solid electrolyte layer disposed between the electrode and the counter electrode, wherein a pore density of the electrode, which is an electrolyte-free electrode, is less than or equal to 15% of an electrode bulk density.