Solid-State Secondary Battery Interface with Electrolytic Mixing Layer
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Solution Overview
Problem
Lithium secondary batteries with liquid phase electrolytes face challenges such as electrolyte leakage, fires, and explosions due to high voltage, and ceramic-based solid electrolytes suffer from poor ion conductivity and charge/discharge efficiency due to interface issues between the electrolyte and electrodes.
Innovation Solution
A secondary battery design incorporating a solid electrolyte layer with a positive electrode and negative electrode, where the electrodes include a mixture of active materials and a liquid phase or gel phase electrolyte at the interface with the solid electrolyte, enhancing contact and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a liquid phase electrolyte is used in the lithium secondary battery, then the discharge capacity and energy density may be advantageously high, but there may be problems such as relatively high risks of electrolyte leakage, fires, and explosions
Solution Approach 1:
The patent uses a solid electrolyte layer as an intermediary between the liquid phase electrolyte and the electrodes. The liquid phase electrolyte is contained within a porous structure and covered by the solid electrolyte layer, which acts as a mediator to prevent direct contact and potential leakage while maintaining the electrochemical functionality of the liquid electrolyte system.
Solution Approach 2:
The patent employs a porous structure to contain the liquid phase electrolyte. The porous material allows the liquid electrolyte to be held within its structure, providing high discharge capacity and energy density while preventing free流动 and leakage of the electrolyte, thus reducing fire and explosion risks.
2Reliability
If a ceramic-based solid electrolyte is used, then high stability may be achieved, but ion conductivity may be lowered or charge/discharge efficiency may be lowered due to poor interface contact between electrolyte and electrode
Solution Approach 1:
The patent creates a composite structure combining liquid phase electrolyte, porous material, and solid electrolyte layer. This composite approach allows the system to benefit from the high stability of ceramic-based solid electrolytes while incorporating liquid phase electrolyte to maintain high ion conductivity and charge/discharge efficiency through the porous structure that ensures good interface contact.
Solution Approach 2:
The porous structure serves as an interface enhancement layer between the solid electrolyte and electrodes. The porous material increases the surface area and improves contact between the solid electrolyte layer and the liquid phase electrolyte, thereby maintaining high ion conductivity and charge/discharge efficiency while using stable ceramic-based solid electrolyte.
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
Improves interface contact between electrodes and electrolytes, increases ion conductivity, and enhances charge and discharge efficiency, reducing the risk of electrolyte leakage and explosions.
Implementation Method 1
the first electrolytic mixing portion is a mixture of a positive electrode active material and a liquid phase and/or gel phase electrolyte
Implementation Method 2
a body including a solid electrolyte layer, and a positive electrode and a negative electrode disposed with the solid electrolyte layer interposed therebetween
Data Source
AI summary
A secondary battery includes a body including a solid electrolyte layer, and a positive electrode and a negative electrode disposed with the solid electrolyte layer interposed therebetween; and first and second external electrodes respectively disposed on one surface and the other surface of the body, opposite to the one surface, and respectively connected to the positive electrode and the negative electrode, wherein the positive electrode comprises a positive electrode active material layer and a first electrolytic mixing portion disposed at an interface of the positive electrode in contact with the solid electrolyte layer. The first electrolytic mixing portion is a mixture of a positive electrode active material and a liquid phase and/or gel phase electrolyte.