Photosintered Oxide Solid Electrolyte Sheet Without Substrate Deformation
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Solution Overview
Problem
Conventional lithium secondary batteries face issues with substrate deformation, material loss, and difficulty in achieving high energy density due to long-term high-temperature sintering processes, which affect the durability and ionic conductivity of solid electrolytes.
Innovation Solution
The development of an oxide-based thin film sintered body using photosintering, which allows for rapid sintering of oxide particles with controlled interparticle contact and porosity, preventing substrate deformation and achieving high ionic conductivity without the need for additional processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long-term high-temperature sintering is used to manufacture solid electrolyte, then sintering completeness is improved, but substrate deformation and material loss occur
Solution Approach 1:
The patent changes the sintering parameters from conventional high-temperature (900-1100°C) long-term processing to low-temperature (300-800°C) short-term processing using pulsed light irradiation. This parameter change enables complete sintering without substrate deformation or material loss by delivering concentrated energy in short pulses rather than prolonged thermal exposure.
Solution Approach 2:
The patent employs periodic pulsed light irradiation instead of continuous heating. The pulsed action allows rapid temperature cycling that promotes sintering while preventing excessive thermal accumulation that causes substrate deformation and material loss. The periodic on-off cycles enable controlled energy input for complete sintering without harmful side effects.
2Reliability
If conventional sintering is used to manufacture solid electrolyte sheet, then sintering completeness is improved, but manufacturing time is excessive
Solution Approach 1:
The patent uses periodic pulsed light irradiation to achieve sintering in minutes rather than hours. The pulsed energy delivery creates rapid thermal cycles that promote quick sintering while maintaining completeness. This periodic action reduces manufacturing time dramatically compared to conventional continuous heating methods.
Solution Approach 2:
The patent rushes through the sintering process by delivering concentrated light energy in short pulses, skipping the lengthy gradual heating phase of conventional sintering. This allows the material to reach sintering completion quickly without requiring prolonged exposure, thus reducing manufacturing time while maintaining sintering quality.
3Manufacturing precision
If additional processing is applied to thin and enlarge solid electrolyte sheet, then area and thickness control is improved, but process complexity increases
Solution Approach 1:
The patent performs preliminary action by controlling the green sheet dimensions and density before sintering, so that the final sintered product achieves the desired thickness and area without additional processing. The green sheet is prepared with precise dimensional control, and the low-temperature sintering preserves these dimensions, eliminating the need for post-sintering thinning or enlargement operations.
Solution Approach 2:
The patent makes the sintering process itself multi-functional by achieving both densification and dimensional control in a single step. The pulsed light sintering simultaneously completes the sintering reaction and maintains the green sheet's thickness and area, combining what would traditionally require separate processing steps into one universal operation.
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 approach results in an oxide-based solid electrolyte sheet with improved durability, ionic conductivity, and energy density, enabling the manufacture of all-solid lithium secondary batteries with enhanced safety and performance.
Implementation Method 1
oxide particles having an energy band gap of 0.1 to 15 eV and absorbing light energy in a wavelength range of 10 to 1200 nm
Data Source
Figure 1
Figure 2A~2C
Figure 3~5
AI summary
Oxide-based thin film sintered bodies, oxide-based solid electrolyte sheets, and all-solid lithium secondary batteries are disclosed. In some implementations, an oxide-based thin film sintered body includes oxide particles, the oxide-based thin film sintered body having a surface roughness Ra ranging from 0.1 to 3 µm, wherein Ra is an arithmetical mean height of a surface, wherein the oxide particles absorb light energy in a wavelength range from 10 to 1200 nm and have an energy band gap ranging from 0.1 to 15 eV.