Solid-State Power Storage Interface Layer for Higher Capacity Density
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Solution Overview
Problem
There is a demand for improving the capacity density of power storage devices.
Innovation Solution
A power storage device comprising at least one first electrode, at least one second electrode, and a solid electrolyte layer with a composite layer containing a carbon material and a second solid electrolyte at the boundary between the electrodes and the solid electrolyte layer, manufactured through a laminate forming and firing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional solid electrolyte layer is used without composite layer, then the structure is simple, but the capacity density is low
Solution Approach 1:
The patent applies composite materials by creating a composite layer that integrates carbon material particles with solid electrolyte material. This composite layer is formed by co-firing the carbon material and solid electrolyte material together, resulting in a unified structure where the carbon material forms a conductive network within the solid electrolyte matrix. This composite structure increases the interface area between electrodes and electrolyte, thereby enhancing capacity density while maintaining structural integrity.
Solution Approach 2:
The patent applies local quality by placing the composite layer specifically at the boundary between the electrode and solid electrolyte layer, rather than uniformly throughout the entire device. This localized placement at the interface region maximizes the beneficial effects of increased surface area and improved conductivity where they are most needed for charge transfer, while keeping the overall device structure relatively simple and avoiding unnecessary complexity in regions where it is not required.
2Quantity of substance
If the interface area between electrode and solid electrolyte is increased, then capacity density improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by combining the formation of the composite layer with the sintering process of the solid electrolyte. The carbon material and solid electrolyte material are co-fired together in a single manufacturing step, allowing the composite layer to form integrally with the solid electrolyte structure. This merged process eliminates the need for separate steps to create high interface area structures, thereby achieving enhanced capacity density without proportionally increasing manufacturing complexity.
Solution Approach 2:
The patent applies parameter changes by utilizing the sintering temperature and atmospheric conditions to transform the physical and chemical properties of the carbon material and solid electrolyte material. During the firing process, these materials undergo phase changes and chemical reactions that result in the formation of a composite structure with optimized interface characteristics. This parameter-based approach allows control over the composite layer formation using existing manufacturing parameters, avoiding the need for entirely new manufacturing processes.
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 increases the interface area between the electrodes and the solid electrolyte layer, enhancing the capacity density of the power storage device.
Implementation Method 1
a solid electrolyte layer disposed between the first electrode and the second electrode and including a first solid electrolyte
Implementation Method 2
a composite layer including a carbon material and a second solid electrolyte, at at least one boundary selected from the group consisting of a first boundary between the first electrode and the solid electrolyte layer and a second boundary between the second electrode and the solid electrolyte layer
Implementation Method 3
a firing step of firing the first laminate to form a second laminate including the solid electrolyte layer and the composite layer
Data Source
AI summary
A power storage device disclosed herein includes at least one first electrode in layer form, at least one second electrode in layer form, and at least one solid electrolyte layer disposed between the first electrode and the second electrode and including a first solid electrolyte. The electric storage device further includes a composite layer including a carbon material and a second solid electrolyte, at least one boundary selected from the group consisting of a first boundary between the first electrode and the solid electrolyte layer and a second boundary between the second electrode and the solid electrolyte layer.