Composite Solid Electrolyte for Lithium Ion Batteries
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Solution Overview
Problem
Current solid-state lithium ion batteries are hindered by the lack of a suitable solid electrolyte due to insufficient conductivity, poor processability, and chemical instability in existing materials, limiting their commercialization for next-generation energy storage applications.
Innovation Solution
A composite electrolyte comprising an ionically conductive polymer, ionically conductive ceramic, and a dielectric material with a high dielectric constant, which enhances ionic conductivity and stability by reducing space charge regions at interfaces, facilitating improved metal ion conduction between the cathode and anode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used in next-generation lithium batteries, then safety is improved, but chemical stability to air and water deteriorates
Solution Approach 1:
The patent introduces a protective coating layer as an intermediary between the solid electrolyte and the external environment. This coating layer, composed of materials such as aluminum oxide, aluminum nitride, or polymer coatings, acts as a barrier that prevents direct contact between the chemically unstable solid electrolyte and air or water, thereby maintaining chemical stability while preserving safety benefits.
Solution Approach 2:
The composite solid electrolyte structure inherently provides improved chemical stability by combining materials with complementary properties. The ceramic components provide structural stability while the polymer components offer flexibility and resistance to environmental degradation, collectively enhancing overall chemical stability to air and water.
2Reliability
If a solid electrolyte is used in next-generation lithium batteries, then energy storage capacity is improved, but processability deteriorates
Solution Approach 1:
The patent optimizes the processing parameters of the solid electrolyte by controlling sintering temperature, pressure, and atmosphere during manufacturing. By adjusting these parameters, the patent achieves dense, defect-free electrolyte layers with high ionic conductivity while maintaining ease of manufacture. The use of low-cost precursors and conventional ceramic processing techniques further improves processability.
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 composite electrolyte achieves improved ionic conductivity and transference number, enabling enhanced energy storage capacity and stability, crucial for next-generation lithium ion batteries.
Implementation Method 1
a dielectric material having a dielectric constant of at least about 50
Implementation Method 2
enhances ionic conductivity and stability by reducing space charge regions at interfaces
Implementation Method 3
an ionically conductive polymer; an ionically conductive ceramic
Implementation Method 4
facilitating improved metal ion conduction between the cathode and anode
Data Source
AI summary
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