Thin-Film Solid-State Battery Electrolyte for Leakage-Free Capacity
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Solution Overview
Problem
Conventional lithium-ion secondary batteries using liquid electrolytes face issues such as limited operable temperature range, decomposition reactions, and the risk of liquid leakage and ignition, while solid electrolyte batteries are costly due to the use of noble metals.
Innovation Solution
A thin-film-type all-solid-state secondary battery using a mixed material of SiOX (0<X<2) and an organic complex of lithium as a solid electrolyte, formed by co-evaporation, which eliminates liquid electrolytes and reduces the risk of leakage, and incorporates a sputtering method for electrode material deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid electrolyte is used in lithium-ion secondary battery, then high capacity can be achieved, but safety deteriorates due to liquid leakage and ignition risk
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid, eliminating the safety issues associated with liquid electrolytes (leakage and ignition) while maintaining lithium ion conductivity through the solid electrolyte layer
Solution Approach 2:
The patent uses a composite structure combining organic complex of lithium with inorganic materials (SiOX, Al2O3, SiO2) to create a solid electrolyte that provides both safety and ionic conductivity, merging the benefits of organic and inorganic materials
2Reliability
If solid electrolyte is used to eliminate liquid leakage, then safety is improved, but manufacturing cost increases due to use of noble metals
Solution Approach 1:
The patent replaces expensive noble metals with cheaper materials such as organic complexes of lithium combined with abundant inorganic materials like SiOX, Al2O3, and SiO2, significantly reducing manufacturing costs while maintaining solid electrolyte functionality
Solution Approach 2:
The patent changes the material composition parameters of the solid electrolyte from noble metal-based to organic-inorganic composite-based, achieving cost reduction while preserving the safety benefits of solid electrolytes
3Quantity of substance
If high-capacity secondary battery is used, then energy storage is improved, but device weight increases
Solution Approach 1:
The patent uses thin-film technology to create a compact battery structure where the solid electrolyte layer and electrode layers are deposited as thin films, achieving high energy density in a lightweight and space-efficient configuration
Solution Approach 2:
The patent employs composite materials including silicon-based negative electrodes and organic-inorganic solid electrolytes that provide high lithium ion capacity while maintaining low weight, achieving high energy storage without significant weight increase
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 solution provides a safer, higher-capacity battery suitable for portable devices with improved heat resistance and flexibility, enabling multilayer stacking and increased capacity without the risks associated with liquid electrolytes.
Implementation Method 1
a mixed material obtained by co-evaporation of SiOX (0<X<2) and an organic complex of lithium
Implementation Method 2
incorporates a sputtering method for electrode material deposition
Data Source
AI summary
An all-solid-state secondary battery having a higher level of safety than a conventional lithium-ion secondary battery using an electrolyte solution, specifically, a thin-film-type solid-state secondary battery, and a manufacturing method thereof are provided. As a solid electrolyte, a mixed material obtained by co-evaporation of SiO and an organic complex of lithium is used. That is, a solid electrolyte layer formed using a mixed material of an inorganic material and an organic material is used in a solid-state secondary battery. The ratio of oxygen to silicon in the solid electrolyte layer is higher than 1 and lower than 2.