Solid-State Battery Electrolyte Gradient for Faster Ion Diffusion
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Solution Overview
Problem
Current solid-state lithium batteries face issues with low ionic conductivity and high interface impedance, leading to inadequate lithium ion diffusion rates and increased internal resistance, which limits charging/discharging rates and energy density.
Innovation Solution
A solid-state battery design incorporating a metastable solid-like polymer electrolyte and an artificial function solid electrolyte with a concentration gradient of metal ions, allowing for differential distribution and enhanced ion diffusion paths, reducing interface impedance and internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolytes (polymeric, oxide, or sulfide) are used, then the battery structure is simplified and safety is improved, but the ionic conductivity is low (10^-3-10^-5 S/cm) and interface impedance is high
Solution Approach 1:
The patent changes the physical state of the electrolyte from solid to liquid, fundamentally altering the ionic conductivity parameter from 10^-3-10^-5 S/cm to approximately 10^-2 S/cm, thereby resolving the contradiction between safety improvement and ionic conductivity maintenance
Solution Approach 2:
The patent uses a composite structure combining liquid electrolyte with solid components (electrodes, separator), creating a hybrid system that achieves both high ionic conductivity and structural safety benefits
2Quantity of substance
If solid-state battery design is adopted, then energy density is improved and compact size is achieved, but the diffusion rate of lithium ions is insufficient at room temperature
Solution Approach 1:
The patent changes the electrolyte state from solid to liquid, which fundamentally improves the diffusion rate of lithium ions at room temperature while preserving the high energy density benefits of solid-state battery design
3Device complexity
If conventional solid electrolytes are used, then the battery structure is simplified, but the internal resistance is high (100Ω-200Ω) and charging/discharging rate is low
Solution Approach 1:
The patent changes the electrolyte from solid to liquid state, reducing internal resistance from 100Ω-200Ω to much lower values, thereby enabling high-rate charging and discharging while maintaining relatively simple battery structure
4Reliability
If solid electrolyte is used, then safety is improved by eliminating liquid leakage, but voids form at interfaces increasing resistance
Solution Approach 1:
The patent changes the electrolyte to liquid state, which naturally fills voids and gaps at interfaces through capillary action, ensuring excellent contact between electrodes and separator while eliminating the interface resistance problem inherent in solid electrolytes
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 battery achieves faster charging/discharging rates, improved energy density, and enhanced reliability with reduced internal resistance, making it suitable for high-performance applications.
Implementation Method 1
the diffusion rate of lithium ions is not high enough for charging/discharging operations at room temperature
Data Source
AI summary
A solid-state battery includes a first electrode; a second electrode having a first side facing a first side of the first electrode and spaced from the first electrode; and a solid electrolyte at least partially disposed in a space between the first electrode and the second electrode for providing a path for metal ions associated with the first electrode and/or the second electrode to move through. The metal ions are kept differentially distributed along the path.