Solid-State Battery Electrode Layer Sintering to Prevent Peeling
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Solution Overview
Problem
Secondary batteries for electric vehicles face challenges in achieving high energy density due to the peeling off of positive electrode layers from solid electrolyte layers when increasing the amount or thickness of electrode active material, leading to lost ion conduction interfaces.
Innovation Solution
A manufacturing method involving the application of pressure during the firing of an electrode material layer containing a specific particle-sized amorphous oxide powder on a solid electrolyte layer, forming a dense positive electrode layer with enhanced adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of electrode active material is increased or the thickness of the electrode layer is increased to achieve high energy density, then the capacity of the battery is improved, but the positive electrode layer peels off from the solid electrolyte layer causing loss of ion conduction interface
Solution Approach 1:
The invention changes the particle size parameter of the electrode active material to a specific range (0.63 μm to 3 μm) to optimize both capacity and adhesion. This parameter optimization prevents peeling while enabling high energy density, resolving the contradiction between increasing material quantity and maintaining layer reliability.
Solution Approach 2:
The invention applies a binder to the solid electrolyte layer surface before forming the electrode active material layer. This preliminary action creates a preparatory layer that enhances adhesion, preventing peeling even when large amounts of active material are used to achieve high capacity.
2Length of stationary object
If the thickness of the electrode layer is increased to achieve high energy density, then the capacity of the battery is improved, but the positive electrode layer peels off from the solid electrolyte layer
Solution Approach 1:
The invention optimizes the particle size parameter of the electrode active material (0.63 μm to 3 μm) to enable thicker electrode layers without peeling. This parameter change allows increased layer thickness for high energy density while maintaining reliable adhesion to the solid electrolyte.
Solution Approach 2:
The binder application creates a preparatory layer on the solid electrolyte surface before depositing the electrode active material. This preliminary action ensures strong adhesion even when the electrode layer is made thicker to increase capacity and 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 method enables high-capacity charge and discharge performance by preventing the positive electrode layer from peeling off, thus maintaining ion conduction and increasing energy density.
Implementation Method 1
a firing step of firing the electrode material layer while applying pressure to the electrode material layer
Implementation Method 2
the interface for ion conduction is lost and, thus, the battery does not work
Data Source
AI summary
Provided is a member for a power storage device that, even when the amount of electrode active material supported is increased, enables charge and discharge and thus achieves a high capacity. A member 6 for a power storage device includes: a solid electrolyte layer 1; and an electrode layer 2 provided on the solid electrolyte layer 1 and made of a sintered body of an electrode material layer 2A containing an electrode active material precursor powder having an average particle diameter of not less than 0.01 μm and less than 0.7 μm.