All Solid State Battery Layer Slippage Prevention
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Solution Overview
Problem
All solid state batteries with a solid electrolyte layer and anode layer area larger than the cathode layer area tend to experience slippage during roll-pressing, leading to potential short circuits due to inadequate adhesive force between the anode foil and the anode layer.
Innovation Solution
A method involving a first pressing step to enhance the adhesive force between the anode foil and the anode layer to 30 N/cm2 or more, followed by a second pressing step with a linear pressure of 1.0 t/cm or more to form a layered body with a solid electrolyte layer extending to all outer peripheral parts of the cathode layer, inhibiting slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of solid electrolyte layer and anode layer is made larger than the area of cathode layer to prevent short circuits, then safety and reliability are improved, but slippage of layers from anode foil occurs during roll-pressing
Solution Approach 1:
The patent applies a first pressing step with a linear pressure of 0.5 t/cm or more before the main roll-pressing operation. This preliminary pressing pre-bonds the anode layer to the anode foil, preventing slippage during subsequent handling and roll-pressing operations. The preliminary action ensures that even when the anode layer area exceeds the cathode layer area, the extended portions remain securely attached.
Solution Approach 2:
The patent controls the adhesive force between the anode layer and anode foil by adjusting the pressing conditions (linear pressure of 0.5 t/cm or more) and material properties. By optimizing these parameters, the patent achieves sufficient adhesion to prevent slippage while maintaining the larger anode layer area design that prevents short circuits between electrodes.
2Quantity of substance
If roll-pressing is applied to densify the layered body, then filling rate and energy density are improved, but adhesive force between anode foil and anode layer becomes insufficient causing slippage
Solution Approach 1:
The patent divides the pressing operation into two distinct stages: a first pressing step with moderate linear pressure (0.5 t/cm or more) to establish adequate adhesive force, and a second roll-pressing step to achieve the desired filling rate and density. This segmentation allows each pressing stage to optimize for its specific function without compromising the other.
Solution Approach 2:
The first pressing step serves as a preliminary action that pre-establishes the adhesive bond between the anode layer and anode foil before the main roll-pressing operation. This preliminary bonding prevents slippage during the subsequent high-pressure roll-pressing that is necessary to achieve the target filling rate of 80% or more for the anode layer.
3Stability of the object's composition
If adhesive force between anode foil and anode layer is increased to prevent slippage, then layer stability is improved, but manufacturing complexity increases due to additional pressing steps
Solution Approach 1:
The patent optimizes the pressing parameters (linear pressure of 0.5 t/cm or more in the first pressing step) to achieve sufficient adhesion with a single controlled pressing operation. By carefully selecting and controlling these parameters, the patent avoids the need for multiple complex pressing steps while still achieving the required adhesive force to prevent slippage during roll-pressing and handling.
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 method effectively prevents slippage of the solid electrolyte and anode layers from the anode foil, ensuring stable battery operation and preventing short circuits.
Implementation Method 1
adhesive force between the anode foil and the anode layer becomes 30 N/cm2 or more
Implementation Method 2
roll-pressing the third layered body with a linear pressure of 1.0 t/cm or more
Data Source
AI summary
A method for producing an all solid state battery in which an anode foil, an anode layer, a solid electrolyte layer, and a cathode layer are layered in this order, and an area of the solid electrolyte layer and the anode layer is larger than an area of the cathode layer is disclosed. The method includes a first pressing step of roll-pressing a first layered body so an adhesive force between the anode foil and the anode layer becomes 30 N/cm2 or more, to form a second layered body; a layered body forming step of forming a third layered body comprising the anode foil, the anode layer, the solid electrolyte layer, and the cathode layer, using the second layered body; and a second pressing step of roll-pressing the third layered body with a linear pressure of 1.0 t/cm or more to form a forth layered body.