Solid Electrolyte Breaking Energy for Low-Resistance Batteries
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Solution Overview
Problem
Batteries face issues with increased resistance due to cracks and peel-off in the electrode and solid electrolyte layers caused by the expansion and contraction of electrode active materials during charge and discharge cycles, leading to disrupted ion and electron conduction paths.
Innovation Solution
A solid electrolyte with a breaking energy of 6.0*103 kJ/m^3 to 21.4*103 kJ/m^3 and a volume expansion rate of electrode active materials of 4 times or less, used in an electrode mixture, along with a production method involving pressing at temperatures below 135°C, to enhance adhesion and maintain conduction paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrode active material is used with high volume expansion rate during charge and discharge, then battery capacity can be improved, but cracks and peel-off occur in the electrode and solid electrolyte layers leading to increased battery resistance
Solution Approach 1:
The invention changes the physical parameter of the solid electrolyte by controlling its breaking energy to be within a specific range (6.0×10³ to 21.4×10³ kJ/m³). This parameter optimization allows the solid electrolyte to accommodate the volume expansion of high-capacity electrode materials without cracking, thus maintaining low battery resistance while enabling high capacity performance
Solution Approach 2:
The invention applies beforehand cushioning by selecting solid electrolyte materials with specifically controlled breaking energy values that can absorb and cushion the mechanical stress generated during electrode expansion and contraction. This pre-selected material property prevents crack formation before it occurs, maintaining reliable ion conduction paths throughout battery operation
2Reliability
If solid electrolyte with high breaking energy is used to prevent cracks, then battery resistance is suppressed, but the solid electrolyte becomes more brittle and difficult to process
Solution Approach 1:
The invention optimizes the breaking energy parameter of the solid electrolyte to fall within a specific range (6.0×10³ to 21.4×10³ kJ/m³). This controlled parameter range provides the ideal balance: high enough to prevent cracks and maintain low resistance, but not excessively high to cause processing difficulties. The specific parameter specification enables both reliable performance and manufacturability
3Duration of action of moving object
If electrode active material layer expands and contracts during charge and discharge, then battery functionality is achieved, but cracks are generated in the electrode and solid electrolyte layers
Solution Approach 1:
The invention applies beforehand cushioning by pre-selecting solid electrolyte materials with specifically controlled breaking energy values that can absorb and cushion the mechanical stress generated during electrode expansion and contraction. This pre-selected material property prevents crack formation before it occurs, maintaining reliable ion conduction paths throughout battery operation
Solution Approach 2:
The invention changes the physical parameter of the solid electrolyte by controlling its breaking energy to be within a specific range (6.0×10³ to 21.4×10³ kJ/m³). This parameter optimization allows the solid electrolyte to accommodate the volume expansion of high-capacity electrode materials without cracking, thus maintaining low battery resistance while enabling high capacity performance
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 effectively suppresses battery resistance by preventing cracks and peel-off, ensuring stable ion and electron conduction, thereby improving battery performance.
Implementation Method 1
a breaking energy of the solid electrolyte when formed into a pellet having a length in X axis direction of 5 mm, a length in Y axis direction of 20 mm, and a length in Z axis direction of 1 mm, at a filling rate of 100% is 6.0×10³ kJ/m³ or more
Data Source
AI summary
A main object of the present disclosure is to provide a solid electrolyte capable of suppressing the increase of battery resistance. The present disclosure achieves the object by providing a solid electrolyte, of which breaking energy when formed into a pellet having a length in X axis direction of 5 mm, a length in Y axis direction of 20 mm, and a length in Z axis direction of 1 mm, at a filling rate of 100% is 6.0*103 kJ/m3 or more and 21.4*103 kJ/m3 or less.