Sintered Electricity Storage Structure for Reflow-Stable High Output
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Solution Overview
Problem
Existing electricity storage devices with solid electrolytes suffer from low ionic conductivity and high interfacial resistance, leading to decreased output due to thermal decomposition and structural changes of organic substances during reflow mounting.
Innovation Solution
An electricity storage device is designed with a structure containing an electrolytic solution and a sintered body of internal electrodes, separator layers, and end surface electrodes, eliminating organic substances to reduce thermal decomposition and structural changes, while maintaining high ion conductivity and low interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used in the electricity storage device, then the device can avoid thermal decomposition of organic substances during reflow mounting, but the ionic conductivity decreases and interfacial resistance increases
Solution Approach 1:
The patent introduces a porous coating layer as an intermediary between the solid electrolyte and the electrode. This coating layer is impregnated with electrolyte solution, creating a transition zone that maintains the thermal stability of the solid electrolyte while providing the high ionic conductivity and low interfacial resistance characteristics of liquid electrolytes at the electrode interface.
Solution Approach 2:
The patent creates a composite structure combining solid electrolyte material with electrolyte solution within a porous coating matrix. This composite approach allows the device to benefit from both the thermal stability of solid electrolytes and the high ionic conductivity of liquid electrolytes, resolving the contradiction between reliability and power output.
2Reliability
If an organic substance is contained in the separator or active material, then the electricity storage device can achieve desired characteristics, but thermal decomposition or structural change occurs during reflow mounting
Solution Approach 1:
The porous coating layer acts as a protective intermediary that contains the necessary organic electrolyte components while shielding them from direct thermal exposure during reflow mounting. The coating structure allows the organic substance to maintain its functional characteristics without undergoing decomposition or structural change.
Solution Approach 2:
The patent creates a protected environment within the porous coating layer where the electrolyte solution and organic substances are shielded from the harsh thermal conditions of reflow mounting. This inert-like protection allows the organic components to maintain their structural integrity and functional properties.
3Power
If an electrolytic solution is used instead of solid electrolyte, then ion conductivity and output are improved, but thermal decomposition of organic substances occurs during reflow mounting
Solution Approach 1:
The patent divides the electrolyte system into two distinct segments: a solid electrolyte bulk material providing thermal stability, and a porous coating layer containing electrolyte solution providing high ionic conductivity. This segmentation allows each component to fulfill its optimal function without suffering from the drawbacks of the other during reflow mounting.
Solution Approach 2:
The patent applies different electrolyte configurations to different regions of the device. The bulk solid electrolyte provides thermal stability where heat resistance is critical, while the porous coating layer with liquid electrolyte provides high ionic conductivity at the electrode interfaces where electrical performance is critical. This local quality differentiation resolves the contradiction between power and reliability.
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 solution enables higher output and desired characteristics by preventing thermal decomposition and structural changes during reflow mounting, enhancing ion conductivity and reducing interfacial resistance compared to devices with solid electrolytes.
Implementation Method 1
the first internal electrode, the second internal electrode, the separator layer, the first end surface electrode, and the second end surface electrode are integrally sintered to form a sintered body
Implementation Method 2
an electrolytic solution... the ion conductivity is high and the interfacial resistance of the electrode is low
Data Source
AI summary
An electricity storage device includes an internal element that has a first main surface, a second main surface, a first side surface, a second side surface, a first end surface, and a second end surface, and that further includes a first internal electrode drawn out to the first end surface, a second internal electrode drawn out to the second end surface, a separator layer disposed between the first and second internal electrodes, and an electrolytic solution. Moreover, a first end surface electrode is disposed on the first end surface; and a second end surface electrode is disposed on the second end surface. The first internal electrode, the second internal electrode, the separator layer, the first end surface electrode, and the second end surface electrode are integrally sintered to form a sintered body.