Solid Battery Electrolyte Segmentation for Sintering and Conductivity
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Solution Overview
Problem
Current solid batteries have insufficient battery characteristics, such as battery capacity and charge/discharge reaction efficiency, due to issues with side reactions and irreversible capacity caused by inadequate sintering and ion conductivity in the electrolyte layers.
Innovation Solution
The configuration of the solid battery includes a first solid electrolyte layer and a second solid electrolyte layer with specific thermal properties and ion conductivity, where the glass transition temperature of the second solid electrolyte is lower than the crystallization temperature of the first solid electrolyte, and the ion conductivity of the second solid electrolyte is lower than the first, ensuring proper sinterability and reducing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single solid electrolyte layer is used in the solid battery, then the structure is simple, but side reactions occur and irreversible capacity increases due to inadequate sintering and ion conductivity
Solution Approach 1:
The solid electrolyte layer is divided into two distinct layers: a first solid electrolyte layer with high ion conductivity for efficient ion transport, and a second solid electrolyte layer with lower ion conductivity but appropriate glass transition and crystallization temperatures for effective sintering. This segmentation allows each layer to perform its specific function optimally, resolving the contradiction between structural simplicity and battery reliability.
Solution Approach 2:
The patent employs a composite electrolyte structure combining two different solid electrolyte materials with complementary properties. The first solid electrolyte provides high ion conductivity, while the second solid electrolyte provides suitable sintering characteristics. This composite approach enables both effective sintering and high ion conductivity simultaneously, improving battery characteristics without excessive complexity.
2Ease of manufacture
If the glass transition temperature of the second solid electrolyte is lowered to improve sinterability, then sintering becomes easier, but ion conductivity may decrease
Solution Approach 1:
Different regions of the electrolyte system are assigned different material properties: the first solid electrolyte layer uses material with high ion conductivity for the active ion transport region, while the second solid electrolyte layer uses material with lower glass transition temperature for the sintering interface region. This local differentiation of material properties allows optimized sintering without compromising overall ion conductivity.
Solution Approach 2:
The electrolyte system is segmented into two functional layers with distinct temperature characteristics. The second solid electrolyte layer with lower glass transition temperature serves as a sintering-friendly interface layer, while the first solid electrolyte layer maintains high ion conductivity for battery operation. This segmentation resolves the trade-off between sinterability and ion conductivity.
3Stability of the object's composition
If the crystallization temperature of the second solid electrolyte is set equal to or higher than the glass transition temperature of the first solid electrolyte, then thermal stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The second solid electrolyte layer is designed with a crystallization temperature that provides a thermal buffer zone above the glass transition temperature of the first solid electrolyte layer. This temperature cushioning prevents unintended crystallization of the first layer during sintering and operation, maintaining thermal stability without requiring extremely precise temperature control.
Solution Approach 2:
The composite electrolyte structure utilizes materials with staggered thermal transition temperatures. The second solid electrolyte's crystallization temperature is deliberately set above the first solid electrolyte's glass transition temperature, creating a stable thermal hierarchy that simplifies manufacturing temperature control while ensuring thermal stability.
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
This configuration enhances battery characteristics by minimizing side reactions, maintaining battery capacity, and improving charge/discharge efficiency, leading to improved overall performance.
Implementation Method 1
the second solid electrolyte layer having an ion conductivity lower than an ion conductivity of the first solid electrolyte layer
Implementation Method 2
inadequate sintering and ion conductivity in the electrolyte layers
Implementation Method 3
the glass transition temperature of the second solid electrolyte is lower than a crystallization temperature of the first solid electrolyte
Implementation Method 4
the crystallization temperature of the second solid electrolyte is equal to or higher than a glass transition temperature of the first solid electrolyte
Data Source
AI summary
A solid battery that includes a positive electrode terminal, a negative electrode terminal spaced apart from the positive electrode terminal, a positive electrode layer electrically connected to the positive electrode terminal, a negative electrode layer electrically connected to the negative electrode terminal, a first solid electrolyte layer between the positive electrode layer and the negative electrode layer and containing a first solid electrolyte, and a second solid electrolyte layer between the positive electrode layer and the negative electrode terminal or between the negative electrode layer and the positive electrode terminal, and containing a second solid electrolyte having a glass transition temperature lower than a crystallization temperature of the first solid electrolyte and having a crystallization temperature equal to or higher than a glass transition temperature of the first solid electrolyte, and the second solid electrolyte layer having an ion conductivity lower than that of the first solid electrolyte layer.