Solid-State Battery Protective Layer for Moisture-Resistant Electrolytes
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Solution Overview
Problem
All-solid-state batteries face safety concerns due to the reaction of sulfide or oxide materials used as solid electrolytes with moisture, leading to degradation of electrolyte materials and reduced product reliability, especially in sintered chip batteries without an outer package.
Innovation Solution
An all-solid-state battery design incorporating a protective layer on its external surface, excluding the electrode areas, to enhance moisture resistance and prevent penetration, which includes a solid electrolyte layer alternately stacked with anode and cathode layers, and external electrodes with conductive resin layers, and a protective layer formed using materials like Al2O3 or SiO2 to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte materials (sulfide or oxide) are used in all-solid-state batteries, then battery safety is improved by eliminating flammable organic liquid electrolytes, but the electrolyte materials react with atmospheric moisture causing degradation and reduced product reliability
Solution Approach 1:
A protective layer is introduced as an intermediary barrier between the solid electrolyte material and atmospheric moisture. This protective layer prevents direct contact and reaction between the electrolyte and moisture, eliminating the harmful effect while preserving the safety benefits of solid electrolytes.
Solution Approach 2:
A thin film protective layer is applied to the solid electrolyte material to create a moisture barrier. This thin film structure effectively blocks atmospheric moisture from penetrating to the electrolyte material, preventing degradation reactions while maintaining the overall battery structure.
2Ease of operation
If plating of external electrodes is used to enable mounting on substrate, then ease of operation is improved, but penetration of plating solution causes degeneration of electrolyte material and deterioration of characteristics
Solution Approach 1:
The protective layer serves as an intermediary barrier during the plating process, allowing plating solution to access the external electrode for mounting while preventing penetration into the solid electrolyte material. This enables ease of operation through plating-based mounting while protecting the electrolyte from degradation.
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 protective layer effectively blocks moisture, preventing degradation and enhancing the battery's reliability by sealing fine pores and cracks, thus improving the battery's moisture resistance and structural integrity.
Implementation Method 1
A protective layer is disposed on an external surface of the body and on the first electrode layer and the second electrode layer
Data Source
AI summary
An all-solid-state battery includes a body including a solid electrolyte layer, and an anode layer and a cathode layer alternately stacked with the solid electrolyte layer interposed therebetween. A first external electrode is disposed on one side of the body and includes a first electrode layer and a first conductive resin layer disposed on the first electrode layer, and a second external electrode is disposed on another side of the body and includes a second electrode layer and a second conductive resin layer disposed on the second electrode layer. A protective layer is disposed on an entirety of an external surface of the body free of the first and second electrode layers and on the first and second electrode layers, and at least one opening is included in a region of the protective layer disposed on at least one of the first electrode layer and the second electrode layer.