Rapid Thermal Processing for Solid-State Battery Separators
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Solution Overview
Problem
Existing methods for fabricating solid-state electrolytes in lithium metal batteries are inefficient and lack the ability to produce high-quality separators that can conduct lithium ions effectively while maintaining stability with lithium metal.
Innovation Solution
Employing rapid thermal processing (RTP) methods that involve sintering materials at high temperatures (900°C to 2000°C) for short durations (5 seconds to 30 minutes) using heating elements within a batch process, with proximity control to produce separators such as LATP, LAGP, or LLZO, utilizing silicon carbide, molybdenum, or carbon heating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional sintering methods are used to fabricate solid-state electrolytes, then the material can be processed, but the production efficiency is low and high-quality separators cannot be produced effectively
Solution Approach 1:
The patent applies rapid thermal processing by dramatically changing the temperature-time parameters of the sintering process. Instead of conventional slow sintering, the method uses high temperatures (900-2000°C) for very short durations (5 seconds to 30 minutes), which transforms the processing efficiency while maintaining or improving separator quality through controlled rapid heating and cooling cycles
Solution Approach 2:
The rapid thermal processing method employs periodic heating and cooling cycles to achieve effective sintering. The material undergoes repeated thermal cycles with controlled ramp rates, holding times at peak temperature, and cooling phases, which enables high-quality separator production through cumulative microstructural refinement without requiring prolonged processing
2Speed
If heating elements are placed close to the material for rapid heating, then processing speed increases, but the risk of contact and damage increases
Solution Approach 1:
The patent introduces an intermediary susceptor layer between the heating element and the material being processed. This susceptor acts as a mediator that absorbs electromagnetic energy and converts it to heat, which is then transferred to the material through controlled contact or proximity, enabling rapid heating while preventing direct damaging contact between the heating element and the delicate separator material
Solution Approach 2:
The patent replaces conventional direct-contact mechanical heating systems with electromagnetic induction heating. By using electromagnetic fields to induce currents in a susceptor, heat is generated volumetrically within the material rather than being conducted from a contact surface, enabling rapid and uniform heating without mechanical contact damage
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
Facilitates the production of high-quality solid-state electrolytes that enhance lithium ion conductivity and stability with lithium metal, improving the performance of solid-state lithium metal batteries.
Implementation Method 1
the heating elements may comprise different forms of silicon carbide, molybdenum or carbon
Implementation Method 2
sintering material at high temperatures for short periods of time using heating elements within a batch process
Data Source
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AI summary
Methods and apparatus for fabricating separators for solid-state lithium metal batteries employ rapid thermal processing. Aspects include high temperature sintering. Temperatures, durations of heat application, and proximity of heating elements to materials undergoing sintering combine to provide separators with desirable physical characteristics, including porosity, in a batch process.