Solid-State Battery Insulating Frame for Uniform Electrolyte Pressing
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Solution Overview
Problem
Existing all-solid rechargeable batteries face challenges in achieving uniform pressing of the solid electrolyte layer, which can lead to electrical short circuits due to non-uniform lithium ion precipitation during charge and discharge.
Innovation Solution
Incorporating an insulating frame with a specific porosity and dimensions between the solid electrolyte layer and the positive electrode active material layer, which undergoes compression to ensure uniform pressing and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no insulating frame is used, then the device complexity is reduced, but the reliability deteriorates due to electrical short circuits from non-uniform lithium ion precipitation
Solution Approach 1:
An insulating frame is introduced as an intermediary component between the positive electrode active material layer and the solid electrolyte layer. This frame prevents direct contact between conductive elements, thereby preventing electrical short circuits while maintaining a relatively simple overall battery structure.
Solution Approach 2:
The battery structure is segmented into distinct functional zones by the insulating frame, which divides the contact interface between the positive electrode and solid electrolyte into insulated regions. This segmentation ensures uniform lithium ion precipitation by preventing uncontrolled electrical contact in specific areas.
2Reliability
If the insulating frame thickness is increased, then the electrical insulation performance is improved, but the manufacturing precision requirements worsen due to compression uniformity challenges
Solution Approach 1:
The insulating frame thickness is optimized to a specific range (5-20 μm) to balance electrical insulation performance with compressibility. This parameter optimization ensures that the frame provides sufficient insulation while remaining thin enough to be uniformly compressed during battery manufacturing, avoiding precision issues.
Solution Approach 2:
The insulating frame is designed with a porous structure having 50-80% porosity. This porosity allows the frame to be compressible and conformable during manufacturing, enabling uniform compression across the battery assembly while maintaining adequate electrical insulation thickness when uncompressed.
3Ease of operation
If the insulating frame porosity is increased, then the compression conformability is improved, but the mechanical strength deteriorates
Solution Approach 1:
The insulating frame utilizes a porous structure with 50-80% porosity, which provides excellent compression conformability allowing the frame to adapt to the battery's compression forces uniformly. The porous structure acts as a cushion that distributes stress while maintaining structural integrity.
Solution Approach 2:
The insulating frame is constructed as a composite material combining an insulating base material with a porous structure. This composite design provides both the mechanical strength needed to maintain structural integrity and the compression conformability required for uniform battery assembly.
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 use of an insulating frame enables uniform pressing of the solid electrolyte layer, suppressing electrical short circuits and maintaining high initial capacity and long lifespan of the battery.
Implementation Method 1
A thickness t1 of the insulating frame before compression may be about 5 μm to less than about 10 μm, and a thickness t2 of the insulating frame after the compression may be about 1 μm to less than about 5 μm
Data Source
AI summary
An all-solid rechargeable battery, including a negative electrode; a solid electrolyte layer stacked on the negative electrode; a positive electrode including a positive electrode active material layer on a positive electrode current collector and stacked on the solid electrolyte layer; an elastic layer provided on at least one side of the positive electrode or the negative electrode; and an insulating frame between the solid electrolyte layer and the positive electrode active material layer.