Ceramic Electrolyte Sheet Layout for Low-Resistance Molten Lithium Batteries
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Solution Overview
Problem
Molten lithium metal batteries based on U-shaped tubular ceramic electrolytes face challenges such as complex preparation processes, poor wettability leading to high interfacial resistance, and detachment of protective interfacial layers, which affect battery performance and cycle life.
Innovation Solution
A ceramic electrolyte sheet divides the battery casing into a top-down structure with a negative electrode chamber and a positive electrode chamber, using a gas-guide metal tube for introducing a liquid lithium ion conducting electrolytic solution, and incorporating an interface protection composition to enhance wettability and reduce internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If U-shaped tubular ceramic electrolyte is used, then battery structure is formed, but preparation process becomes complex
Solution Approach 1:
The battery is divided into separate components: a flat ceramic electrolyte sheet and a distinct U-shaped tubular structure. This segmentation allows the ceramic electrolyte to be manufactured as a simple flat sheet (improving ease of manufacture) while the U-shaped tube serves as a separate structural element containing the electrodes, thus maintaining the required battery structure without complicating the ceramic electrolyte preparation process.
2Device complexity
If conventional ceramic electrolyte is used, then battery assembly is simplified, but wettability is poor leading to high interfacial resistance
Solution Approach 1:
The ceramic electrolyte sheet is modified with specific surface treatments or coatings only at the regions where it contacts the liquid electrolyte and electrodes. This local quality enhancement improves wettability and reduces interfacial resistance at critical interfaces without requiring modification of the entire ceramic electrolyte structure, thus maintaining assembly simplicity while improving electrical contact.
Solution Approach 2:
An intermediate layer or surface treatment is introduced between the ceramic electrolyte and the liquid electrolyte/electrodes. This intermediary improves the interfacial properties by enhancing wettability and reducing resistance, acting as a bridge that connects the ceramic and liquid components effectively without complicating the overall assembly process.
3Reliability
If protective interfacial layer is applied, then interface protection is improved, but layer detachment occurs affecting cycle life
Solution Approach 1:
The protective function is merged into the ceramic electrolyte sheet itself through bulk modification or integrated surface treatment, rather than applying a separate detachable protective layer. This integration ensures that the protective properties are inherent to the ceramic electrolyte structure, preventing layer detachment during cycling and extending battery life while maintaining interface protection.
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 design simplifies preparation, improves wettability, reduces internal resistance, and enhances battery performance by ensuring uniform contact and efficient lithium ion migration, thereby increasing capacity and rate performance.
Implementation Method 1
a ceramic electrolyte sheet, wherein the ceramic electrolyte sheet divides the convex casing into an upper part and a lower part... the upper part is a negative electrode chamber, the lower part is a positive electrode chamber
Implementation Method 2
introducing a liquid lithium ion conducting electrolytic solution, and incorporating an interface protection composition to enhance wettability and reduce internal resistance
Data Source
AI summary
A molten lithium metal battery based on a ceramic electrolyte sheet, comprising: a casing in the shape of the Chinese character “” and a ceramic electrolyte sheet, wherein the ceramic electrolyte sheet divides said casing into an upper part and a lower part, the upper part is a negative electrode chamber, the lower part is a positive electrode chamber, a positive electrode material is contained in the positive electrode chamber, and a lithium recess is formed in the negative electrode chamber; gas guide metal tubes, wherein the gas guide metal tubes are connected to and communicated with said casing, and openings of the air guide metal tubes are higher than the bottom surface of the ceramic electrolyte sheet; an upper cover and a negative electrode current collector, wherein the negative electrode current collector passes through the upper cover and is led out from the upper cover, the negative electrode current collector and the upper cover are sealed together by means of an insulating sealing material, the upper cover is arranged at the top of said casing and seals said casing, a negative electrode material is contained in the lithium recess, and a seal is formed between the lithium recess and said casing; and a bottom cover, wherein the bottom cover is connected to the bottom end of said casing.