Oxide-based film sheet, oxide-based solid electrolyte sheet, and all-solid lithium secondry battery
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Solution Overview
Problem
Conventional lithium secondary batteries using liquid electrolytes face risks such as ignition due to electrolyte leakage and decomposition, and have limitations in achieving high energy density, while solid electrolytes face challenges like substrate deformation and manufacturing complexities during sintering processes.
Innovation Solution
An oxide-based film sheet incorporating colored oxide particles is used for manufacturing an oxide-based solid electrolyte sheet through a light-sintering process, which allows for rapid, large-area production with improved durability and ionic conductivity, avoiding substrate deformation and enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional liquid electrolyte is used in lithium secondary battery, then ease of manufacture is improved, but safety deteriorates due to ignition risk from electrolyte leakage and decomposition
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid form. By using oxide-based solid electrolyte particles instead of liquid electrolyte, the invention eliminates the safety issues associated with liquid electrolyte leakage and decomposition while maintaining manufacturability through particle-based assembly processes.
2Reliability
If separator is included in conventional lithium secondary battery to prevent electrolyte leakage, then safety is improved, but energy density deteriorates due to space occupation
Solution Approach 1:
The patent extracts and eliminates the separator component from the battery structure. By using solid electrolyte particles that inherently prevent ion transport in unwanted directions through their material properties rather than physical separation, the invention removes the need for separate safety components, thereby increasing energy density.
3Reliability
If solid electrolyte is used to eliminate liquid electrolyte safety risks, then safety is improved, but manufacturing complexity increases due to sintering process requirements
Solution Approach 1:
The patent uses oxide-based solid electrolyte particles that can be directly assembled without requiring complex sintering processes. The particle-based approach allows for simpler manufacturing where pre-formed particles are combined and pressed, eliminating the need for high-temperature sintering equipment and complex process control.
4Reliability
If sintering process is used to manufacture oxide-based solid electrolyte sheet, then ionic conductivity is improved, but substrate deformation occurs during processing
Solution Approach 1:
The patent replaces the thermal sintering process with a mechanical pressing process. By applying pressure to compact oxide-based solid electrolyte particles at lower temperatures, the invention achieves sufficient density and ionic conductivity without the high temperatures that cause substrate deformation, thus substituting thermal processing with mechanical processing.
5Productivity
If rapid sintering is applied to reduce manufacturing time, then productivity is improved, but substrate damage and sheet deformation increase
Solution Approach 1:
The patent substitutes rapid thermal sintering with mechanical pressing at lower temperatures. This allows for rapid manufacturing through direct compression of particles without requiring high-temperature furnaces, thereby maintaining productivity while avoiding substrate damage and deformation associated with rapid heating processes.
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 oxide-based solid electrolyte sheet achieves improved safety, energy density, and manufacturing efficiency with enhanced durability and ion conductivity, addressing the limitations of conventional lithium secondary batteries.
Implementation Method 1
the oxide-based particle includes a colored oxide particle capable of absorbing light energy in a visible light spectrum
Data Source
AI summary
An oxide-based film sheet according to an embodiment of the disclosure includes an oxide-based particle, wherein the oxide-based particle includes a colored oxide particle capable of absorbing light energy in a visible light spectrum. An oxide-based solid electrolyte sheet according to an embodiment of the disclosure may be prepared by light-sintering the oxide-based film sheet. According to an embodiment of the disclosure, an oxide-based solid electrolyte sheet in which a connection structure between particles, shapes of the particles, porosity, or the like are appropriately provided may be prepared by light-sintering.