Ionic Liquid LLZ Ion Conductor for High-Conductivity Press Molding
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Solution Overview
Problem
LLZ ion conductive powders exhibit low lithium ion conductivity in molded products due to high electric resistance between particles, and high-temperature firing to improve conductivity leads to warpage, deformation, and reduced conductivity.
Innovation Solution
Incorporating an ionic liquid with lithium ion conductivity and an average thickness of 5 nm or more into an ion conductor, along with an LLZ ion conductive powder, to enhance lithium ion conductivity without high-temperature firing, and optimizing porosity and binder usage for improved moldability and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature firing is applied to improve lithium ion conductivity, then conductivity increases, but warpage and deformation occur making large-size battery production difficult
Solution Approach 1:
The invention changes the processing parameters from high-temperature firing to low-temperature press molding, achieving high lithium ion conductivity (1.0×10^-5 S/cm or more at 25°C) without the shape distortion caused by high-temperature treatment
Solution Approach 2:
The invention uses a composite structure combining ion conductive powder particles with an ionic liquid layer (average thickness 5 nm or more) to achieve high conductivity at low temperature, avoiding the need for high-temperature firing that causes warpage
2Reliability
If high-temperature firing is applied to improve lithium ion conductivity, then conductivity increases, but reaction with electrode active material forms high resistance layer reducing conductivity
Solution Approach 1:
The ionic liquid acts as an intermediary layer between the ion conductive powder and electrode active material, preventing direct harmful reactions while maintaining high lithium ion conductivity without requiring high-temperature firing
3Ease of manufacture
If press molding is used to form compact, then moldability improves, but particle point contact causes high electric resistance and low conductivity
Solution Approach 1:
The ionic liquid serves as a mediator between particles in the press-molded compact, filling the gaps between point-contact particles and providing continuous ionic conduction paths, thereby achieving high conductivity (1.0×10^-5 S/cm or more at 25°C) while maintaining excellent moldability
Solution Approach 2:
The invention utilizes a porous compact structure with porosity of 30% or less, where the ionic liquid fills the pore spaces between particles, transforming the harmful point-contact structure into a continuous conductive network
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 ion conductor achieves high lithium ion conductivity of 1.0×10−5 S/cm or more at 25°C as a compact formed by press molding, without the drawbacks of high-temperature firing, and with improved moldability and handling properties.
Implementation Method 1
an ionic liquid having lithium ion conductivity, wherein the ionic liquid has an average thickness of 5 nm or more
Data Source
AI summary
An ion conductor exhibiting high lithium ion conductivity in the form of a molded product without firing is provided. The ion conductor contains an ion conductive powder having lithium ion conductivity and an ionic liquid having lithium ion conductivity. The ionic liquid has an average thickness of 5 nm or more.