Solid-State Battery Side-Electrolyte Structure for Reference Measurement
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Solution Overview
Problem
Existing solid-state batteries face challenges in accurately measuring electrical characteristics due to difficulties in forming and arranging the solid electrolyte layer for three-electrode measurements, leading to potential breakage and short-circuiting issues with the reference electrode.
Innovation Solution
A battery design featuring a solid-state battery section with a first and second solid electrolyte layer, where the second solid electrolyte layer has a smaller reference electrode in contact with its second principal surface, reducing the likelihood of short-circuiting and enhancing mechanical strength through an outer package that covers the side surface and includes insulating resin for improved bondability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a three-electrode measurement structure is implemented in a solid-state battery, then electrical characteristics of electrodes can be measured, but the solid electrolyte layer formation and reference electrode arrangement become difficult and unreliable
Solution Approach 1:
The reference electrode is moved from the traditional planar arrangement to a protruding structure that extends into the electrolyte layer. This dimensional change allows the reference electrode to be positioned optimally for measurement while maintaining stable electrochemical contact, preventing breakage and short-circuiting issues
2Quantity of substance
If the solid electrolyte layer is thinned to achieve high energy density, then battery performance improves, but the reference electrode section becomes more prone to breakage and short-circuiting
Solution Approach 1:
A support structure is provided behind the reference electrode that protrudes into the solid electrolyte layer. This support structure acts as a cushioning element that prevents the thin electrolyte layer from breaking or causing short-circuits, while still allowing the battery to maintain high energy density through thin electrode and electrolyte layers
3Ease of operation
If the reference electrode is arranged with the same width as the electrode layers, then three-electrode measurement is possible, but breakage and short-circuiting are likely to occur
Solution Approach 1:
The support structure is localized specifically at the reference electrode section rather than throughout the entire battery. This localized reinforcement provides the necessary structural integrity where needed most (at the vulnerable reference electrode interface) without adding unnecessary weight or complexity elsewhere in the battery structure
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
This design allows for reliable measurement of electrical characteristics while preventing short-circuiting and improving the durability and mechanical strength of the battery, enabling stable potential measurement and extended battery life by controlling electrode performance.
Implementation Method 1
the solid electrolyte layer is required to be electrochemically bonded and contacted between a cell section and a reference electrode
Data Source
AI summary
A battery includes: a solid-state battery section having at least one power generating element including a first electrode layer, a second electrode layer, and a first solid electrolyte layer positioned between the first electrode layer and the second electrode layer; and a structure including a second solid electrolyte layer having a first principal surface in contact with the at least one power generating element on a side surface of the solid-state battery section and a second principal surface opposite to the first principal surface, and a reference electrode in contact with the second principal surface.