All-Solid-State Battery Electrodes for Low-Pressure Roll-Pressing
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in formability and elongation of electrode plates, which can lead to fractures and detachment during the manufacturing process, affecting their structural integrity and performance.
Innovation Solution
Incorporation of a lubricant additive, such as compounds with specific repeating units represented by Chemical Formulas 1 and 2, into the positive and/or solid electrolyte layers to enhance the formability and elongation of electrode plates, allowing for low-pressure roll-pressing fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrode plate manufacturing is used without lubricant additive, then manufacturing process is simpler, but formability and elongation are poor causing fractures and detachment
Solution Approach 1:
A lubricant additive comprising a specific compound (with repeating units of Chemical Formula 1 or 2) is introduced as an intermediary substance between electrode plates during the stacking process. This additive improves formability and elongation by reducing friction and enhancing adhesion, allowing low-pressure roll-pressing without causing fractures or detachment, while maintaining relatively simple manufacturing procedures.
2Strength
If high pressure is applied during roll-pressing to ensure good contact, then electrode layer adhesion is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The lubricant additive changes the friction and adhesion parameters of the electrode plate surface, enabling effective contact and adhesion at lower pressing pressures. This parameter modification allows achieving good electrode layer adhesion without requiring high-pressure roll-pressing, thereby simplifying the manufacturing process and reducing equipment requirements.
3Ease of operation
If lubricant additive is added to improve formability, then electrode plate fluidity and adhesion improve, but internal resistance may increase
Solution Approach 1:
The lubricant additive is designed with specific molecular characteristics (repeating units of Chemical Formula 1 or 2) that optimize the balance between fluidity and electrical conductivity. By controlling the chemical structure and properties of the additive, the patent achieves improved electrode plate formability and adhesion while minimizing the impact on internal resistance, thus maintaining battery reliability.
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 lubricant additive improves the fluidity and adhesion of electrode layers, preventing fractures and detachment, enabling efficient manufacturing of high-energy density and safe all-solid-state batteries with reduced internal resistance.
Implementation Method 1
a lubricant additive for increasing formability and elongation of an electrode plate
Implementation Method 2
The lubricant additive improves the fluidity and adhesion of electrode layers, preventing fractures and detachment
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Disclosed are all-solid-state batteries and fabrication methods thereof. The all-solid-state battery includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer between the positive electrode layer and the negative electrode layer. At least one of the positive electrode layer and the solid electrolyte layer includes a lubricant additive. The lubricant additive includes one of a first compound that includes a repeating unit, a second compound that includes a repeating unit, and a combination of the first compound and the second compound.