Electrode Composite Membrane Structure to Prevent Edge Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium secondary batteries face issues with electrolyte leakage and gas generation, leading to separation of the electrode and electrolyte membrane during the manufacturing process of solid-state batteries, resulting in short-circuits and reduced production yield.
Innovation Solution
An electrode composite membrane is designed with an electrode plate, a reinforcing material portion, an electrolyte membrane, and an adhesive portion, where the electrolyte membrane is in close contact with both the electrode and reinforcing material portions, and the reinforcing material surrounds the perimeter of the electrode portion, enhancing adhesion and preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electrode and electrolyte membrane are pressed together during manufacturing, then adhesion between them is improved, but separation occurs at the edge portion causing short-circuits
Solution Approach 1:
The patent applies preliminary action by pre-forming a protrusion on the electrode before assembly. This protrusion is designed to extend beyond the electrolyte membrane in the initial state, creating an overlapping structure that prevents edge separation during subsequent pressing operations. The protrusion is formed in advance through extrusion or molding processes, ensuring the electrode maintains proper positioning and adhesion throughout manufacturing.
Solution Approach 2:
The patent employs dimensionality change by transitioning from a planar electrode structure to a three-dimensional structure with a protrusion. The protrusion extends in the thickness direction beyond the electrolyte membrane, creating an overlapping region that provides mechanical interlocking. This dimensional change allows the electrode to maintain contact with the electrolyte membrane at the edges during pressing, preventing separation and short-circuits.
2Manufacturing precision
If the electrode is pressed during manufacturing, then contact between components is improved, but the electrode curls at the edges causing separation
Solution Approach 1:
The patent applies preliminary action by pre-forming a protrusion on the electrode before assembly. This protrusion is designed to extend beyond the electrolyte membrane in the initial state, creating an overlapping structure that prevents edge separation during subsequent pressing operations. The protrusion is formed in advance through extrusion or molding processes, ensuring the electrode maintains proper positioning and adhesion throughout manufacturing.
Solution Approach 2:
The patent applies preliminary anti-action by creating a protrusion structure that counteracts the curling tendency of the electrode during pressing. The protrusion extends beyond the electrolyte membrane and provides mechanical restraint that prevents edge curling. This preliminary structural feature opposes the harmful curling effect before it can occur during the pressing process, maintaining electrode shape stability.
3Object-generated harmful factors
If a solid-state battery is used, then electrolyte leakage and gas generation are eliminated, but manufacturing complexity increases due to pressurization requirements
Solution Approach 1:
The patent applies preliminary action by pre-forming a protrusion on the electrode before assembly. This protrusion is designed to extend beyond the electrolyte membrane in the initial state, creating an overlapping structure that prevents edge separation during subsequent pressing operations. The protrusion is formed in advance through extrusion or molding processes, ensuring the electrode maintains proper positioning and adhesion throughout manufacturing.
Solution Approach 2:
The patent employs local quality by creating a protrusion with different geometric properties at specific locations on the electrode. The protrusion has increased thickness or extended boundaries at the edges where it overlaps with the electrolyte membrane, providing localized reinforcement. This local structural modification enhances adhesion and prevents separation at critical edge regions without requiring complex modifications to the entire battery structure.
Data Source
AI summary
An electrode composite membrane and an electrochemical device including the same are provided. The electrode composite membrane includes: an electrode plate having an electrode portion and a reinforcing material portion; an electrolyte membrane disposed on one surface of the electrode plate; a support disposed on the other surface of the electrode plate; and an adhesive portion disposed at least at a part of a portion where the electrode plate and the support face each other, wherein the electrode portion includes a current collector and an active material layer disposed on at least one surface of the current collector, the electrolyte membrane is in close contact with the electrode portion and the reinforcing material portion with no spacing therebetween, while being in contact with at least a part of the active material layer, and the reinforcing material portion has a thickness equal to or smaller than a thickness of the electrode portion, is disposed in such a manner that it surrounds all or at least a part of a perimeter of a lateral side of the electrode portion and is in contact with the lateral side of the electrode portion with no spacing therebetween.