Solid Electrolyte Layer with Heat-Resistant Resin Against Dendrites
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Solution Overview
Problem
Existing all-solid-state secondary batteries face issues with short circuits caused by dendrite formation, particularly in high-temperature environments where conventional resins used in the battery layers soften or melt, allowing dendrites to penetrate and cause electrical contact between electrodes.
Innovation Solution
Incorporating a heat-resistant resin with ion conductivity between the solid electrolyte and negative electrode layers, ensuring a glass-transition temperature of at least 200°C, to prevent dendrite growth and maintain electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional resin is used in the solid electrolyte-containing layer, then the manufacturing cost and processing ease are improved, but the resin softens or melts at high temperatures allowing dendrite penetration and short circuits
Solution Approach 1:
The patent employs a composite structure consisting of a solid electrolyte layer and a heat-resistant resin layer. The solid electrolyte provides ion conductivity while the heat-resistant resin layer (with glass-transition temperature of not less than 200°C) provides structural stability at high temperatures and prevents dendrite penetration. This composite approach combines the advantages of both materials to achieve both ease of manufacture and reliable short circuit prevention.
2Reliability
If the glass-transition temperature of the resin is increased to prevent dendrite growth, then the short circuit prevention capability is improved, but the manufacturing complexity and material selection constraints increase
Solution Approach 1:
The patent specifies a parameter threshold for the heat-resistant resin: a glass-transition temperature of not less than 200°C. This parameter change ensures the resin maintains its physical properties and structural integrity at high temperatures, preventing dendrite penetration. By setting this specific temperature threshold, the patent simplifies material selection criteria while ensuring reliable dendrite prevention without excessive complexity.
3Stability of the object's composition
If a heat-resistant resin with high glass-transition temperature is used, then the structural integrity at high temperatures is maintained, but the ion conductivity may be reduced compared to conventional resins
Solution Approach 1:
The patent divides the solid electrolyte-containing layer into two distinct functional layers: a solid electrolyte layer that provides primary ion conductivity and a heat-resistant resin layer that provides structural stability and dendrite prevention. This segmentation allows each layer to be optimized for its specific function - the solid electrolyte for ion transport and the heat-resistant resin for thermal stability - thereby maintaining overall ion conductivity while ensuring structural integrity at high temperatures.
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 heat-resistant resin layer effectively prevents short circuits by maintaining structural integrity under high temperatures, reducing dendrite formation and ensuring stable battery operation.
Implementation Method 1
the heat-resistant resin having ion conductivity has a glass-transition temperature of not less than 200°C
Implementation Method 2
a heat-resistant resin having ion conductivity
Data Source
Figure 1~2
AI summary
Provided is a solid electrolyte-containing layer capable of preventing a short circuit caused by the formation of a dendrite. A solid electrolyte-containing layer (50a) in accordance with an aspect of the present invention includes: an inorganic solid electrolyte; and a heat-resistant resin having ion conductivity.