Solid-State Lithium Battery Buffer Layer for Low Interface Resistance
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Solution Overview
Problem
Conventional lithium batteries using metallic lithium as a negative electrode face issues with increased interface resistance between the electrolyte layer and the negative electrode material, leading to decreased conductivity, and the use of flammable electrolytic solutions poses risks of leakage and ignition.
Innovation Solution
A lithium battery design featuring a substrate with a positive electrode material layer, an electrolyte layer with recessed parts, a buffer layer filling these recesses, and a negative electrode layer, where the electrolyte and buffer layers are formed without vacuum deposition, reducing interface resistance and enhancing conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used to reduce electrolyte leakage and control ignitability, then safety is improved, but interface resistance between the electrolyte layer and negative electrode material increases, causing decreased conductivity
Solution Approach 1:
The invention introduces a buffer layer with specific properties (porosity, material composition) at the interface between the solid electrolyte layer and negative electrode, creating local quality variation. This buffer layer specifically addresses the interface resistance problem without changing the properties of the bulk solid electrolyte layer, thus maintaining safety while improving conductivity at the critical interface region.
Solution Approach 2:
The invention uses a composite structure consisting of the solid electrolyte layer combined with a buffer layer made of different materials (such as lithium phosphate, lithium silicate, or porous structures). This composite approach allows the system to exhibit both the safety properties of the solid electrolyte and the low interface resistance properties of the buffer layer material.
2Manufacturing precision
If vacuum deposition is used to form electrode layers, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention replaces the vacuum deposition process (a complex mechanical/physical vapor deposition system) with a simpler solution: forming electrode layers through conventional coating methods followed by drying and heating. This substitution eliminates the need for vacuum equipment while achieving sufficient layer formation for battery operation.
Solution Approach 2:
The invention changes the formation parameters of electrode layers from vacuum deposition conditions to atmospheric pressure coating conditions. By adjusting parameters such as coating thickness, drying temperature, and heating treatment, the invention achieves functional electrode layers without requiring complex vacuum deposition equipment.
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 allows for efficient manufacturing of lithium batteries with improved conductivity and reduced risk of electrolyte leakage, while avoiding costly vacuum deposition processes.
Implementation Method 1
a lithium secondary battery using metallic lithium in an electrode plate for a negative electrode is known... a lithium battery can be manufactured using a solid electrolyte membrane containing a Lithium Super Ionic Conductor (LISICON)
Implementation Method 2
the electrolyte layer has a recessed part that is recessed toward the substrate in a portion of the surface facing the negative electrode layer, and the buffer layer is formed in such a manner that the buffer layer fills the recessed part
Data Source
AI summary
The purpose of the present invention is to efficiently manufacture a lithium battery having improved conductivity. Provided is a lithium battery including a substrate; a positive electrode material layer formed on one surface of the substrate; an electrolyte layer formed on the surface of the positive electrode material layer opposite to the surface facing the substrate; a buffer layer formed on the surface of the electrolyte layer opposite to the surface facing the substrate; a negative electrode layer containing lithium, which is formed on the surface of the buffer layer opposite to the surface facing the substrate. The electrolyte layer has a recessed part that is recessed toward the substrate in a portion of the surface facing the negative electrode layer, and the buffer layer is formed such that the buffer layer fills the recessed part.