Solid-State Battery Electrode PTC Resistor Layer Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PTC resistor layers in solid-state batteries with insulating inorganic substances exhibit high electronic resistance at normal temperatures due to decreased adhesion between the PTC resistor layer and the electrode active material layer, which is detrimental to battery performance.
Innovation Solution
A method for producing a PTC resistor layer with a specific composition and structure, involving a first coating layer with a higher content of insulating inorganic substance and a second coating layer with a lower content, applied between the current collector and the electrode active material layer, to maintain low electronic resistance at normal temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PTC resistor layer containing insulating inorganic substance is formed with high content to improve PTC resistor function under pressure, then the PTC resistor function is enhanced, but electronic resistance at normal temperature increases
Solution Approach 1:
The PTC resistor layer is divided into two distinct coating layers: a first coating layer with high insulating inorganic substance content (50-80 volume %) for pressure resistance, and a second coating layer with low insulating inorganic substance content (0-20 volume %) for low normal temperature resistance. This segmentation allows each layer to optimize its function without compromising the other.
Solution Approach 2:
Different regions of the PTC resistor layer have different compositions tailored to their specific functions. The first coating layer (near current collector) has high insulating content for structural stability under pressure, while the second coating layer (near active material) has low insulating content for maintaining electron conductivity at normal temperature.
2Stability of the object's composition
If insulating inorganic substance content is increased to maintain layer structure under pressure, then structural stability is improved, but adhesion between PTC resistor layer and electrode active material layer decreases
Solution Approach 1:
The PTC resistor layer is segmented into two coating layers with different insulating inorganic substance contents. The first layer provides structural stability under pressure, while the second layer with lower insulating content ensures good adhesion to the electrode active material layer.
Solution Approach 2:
The PTC resistor layer is formed as a composite structure with two coating layers having different material compositions. The first layer uses high insulating inorganic substance content for pressure resistance, while the second layer uses low insulating inorganic substance content for adhesion, creating a composite material system that achieves both 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
The method effectively reduces electronic resistance at normal temperatures and maintains the PTC resistor function even under pressure, enhancing the battery's performance and safety by preventing overheating and short circuits.
Implementation Method 1
forming a first coating layer by applying a first slurry containing an electroconductive material, an insulating inorganic substance and a polymer to a first surface of the current collector and drying the applied first slurry, forming a second coating layer by applying a second slurry containing an electroconductive material and a polymer to a surface of the first coating layer and drying the applied second slurry
Implementation Method 2
the electrode comprising a positive temperature coefficient (PTC) resistor layer which has electron conductivity at normal temperature and which shows a rapid increase in electronic resistance value when the temperature of the battery is increased by the misuse
Data Source
AI summary
Provided is a method for producing an electrode for solid-state batteries which comprises a PTC resistor layer containing an insulating inorganic substance and in which electronic resistance is low. The production method is a method for producing an electrode for solid-state batteries, wherein the method is a method for producing an electrode for use in a solid-state battery comprising a cathode, an anode and an electrolyte layer disposed between the cathode and the anode; wherein the electrode is at least one of the cathode and the anode, and the electrode comprises a current collector, an electrode active material layer and a PTC resistor layer disposed between the current collector and the electrode active material layer.