Glass-Ceramic Solid Electrolyte for Low-Expansion Microchip Batteries
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Solution Overview
Problem
All-solid-state batteries face challenges with low ionic conductivity and high interfacial resistance due to the use of liquid electrolytes, and oxide-based solid electrolytes in microchip form are prone to thermal expansion and breakage during manufacturing.
Innovation Solution
Development of a solid electrolyte system comprising Li, Si, B, Zr, and P, with specific mole fractions, forming a glass or glass ceramic structure that enhances ionic conductivity, reduces interfacial resistance, and suppresses thermal expansion, and further inclusion of additional components like Li, Al, or Cl to improve conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide-based solid electrolyte is used in microchip-type all-solid-state battery, then ecofriendliness and product performance are improved, but thermal expansion and breakage occur during co-firing process
Solution Approach 1:
The patent modifies the chemical composition parameters of the oxide-based solid electrolyte by incorporating specific ratios of Li, Si, B, Zr, and P elements. This compositional parameter change optimizes the material properties to reduce thermal expansion coefficient and enhance mechanical strength, allowing the electrolyte to withstand the co-firing process without breakage while maintaining ecofriendliness and performance
Solution Approach 2:
The patent creates a composite oxide-based solid electrolyte material by combining multiple metal oxides (Li, Si, B, Zr, P) in specific proportions. This composite structure synergistically improves both the thermal stability (reducing thermal expansion) and mechanical strength, enabling the material to maintain integrity during high-temperature co-firing while preserving its ecofriendly characteristics and electrochemical performance
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 solid electrolyte system achieves high ionic conductivity, low interfacial resistance, and strong strength, enabling the manufacturing of multi-layered microchip-type all-solid-state batteries with improved performance and durability.
Implementation Method 1
the solid electrolyte has lower ionic conductivity than the liquid electrolyte and thus has a problem of interfacial resistance to ion movements between electrodes and electrolytes
Implementation Method 2
the oxide-based solid electrolyte, which is generally-known, has an amorphous glass structure and thus may be thermally expanded or easily broken during a co-firing process for manufacturing the microchip-type all-solid-state battery
Data Source
AI summary
The present disclosure relates to a solid electrolyte and an all-solid-state battery including the same. Specifically, provided are an oxide of a specific component system as a solid electrolyte (first solid electrolyte) and a solid electrolyte (second solid electrolyte) further including an oxide or salt of another component system as a second component while including the oxide of the specific component system as a first component.