Porous Insulating Layer Composition for Battery Electrode Swelling
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Solution Overview
Problem
The thickness increase of the active material layer in non-aqueous electrolyte rechargeable battery electrodes due to solvent penetration during the coating of a porous insulating layer composition, leading to residual stress and deformation, which can hinder the battery's assembly into an external case and affect its performance.
Innovation Solution
A composition for forming a porous insulating layer on the active material layer using an organic solvent with a specific Hansen solubility parameter distance greater than or equal to 8.0 (MPa) 1/2 from the active material layer binder, combined with insulating inorganic particles, to suppress layer thickness increase and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If material slurry for porous insulating layer is coated on active material layer, then insulating layer is formed to prevent internal short circuit, but solvent penetrates into active material layer causing thickness increase
Solution Approach 1:
The patent changes the chemical parameter of the solvent by selecting organic solvents with specific Hansen solubility parameters that do not interact with the active material layer binder, preventing solvent penetration and subsequent thickness increase while still forming the insulating layer
Solution Approach 2:
The patent introduces a binder as an intermediary substance in the material slurry that mediates between the organic solvent and the active material layer binder, preventing direct interaction and penetration while allowing the insulating layer to form properly
2Quantity of substance
If compression pressure is increased to achieve high energy density, then electrode density is improved, but residual stress and deformation increase making integration difficult
Solution Approach 1:
The patent applies beforehand cushioning by pre-selecting organic solvents with specific Hansen solubility parameters that prevent penetration and stress disruption, cushioning against the residual stress problems that would otherwise occur during high-pressure compression to achieve high energy density
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 prevents swelling and residual deformation of the active material layer, ensuring the electrode maintains its designed thickness and stability, even under high energy density and cycling conditions.
Implementation Method 1
a distance between Hansen solubility parameters of the active material layer binder and the organic solvent is greater than or equal to 8.0 (MPa) 1/2
Data Source
Figure 1
AI summary
Disclosed are a composition for forming a porous insulating layer for suppressing a layer thickness increase of an active material layer of an electrode, a method for manufacturing an electrode for a non-aqueous electrolyte rechargeable battery, and an electrode for a non-aqueous electrolyte rechargeable battery manufactured according to the method and a non-aqueous electrolyte rechargeable battery. The composition for forming the porous insulating layer according to the present disclosure is a composition for forming a porous insulating layer on an active material layer disposed on a main surface of a current collector, wherein the active material layer include at least active material capable of electrochemically intercalating and deintercalating lithium ions and active material layer binder, the composition for forming the porous insulating layer includes a solvent including an organic solvent and an insulating inorganic particle, and a distance between Hansen solubility parameters of the active material layer binder and the organic solvent is greater than or equal to 8.0 (MPa)1/2.