All-Solid Battery Electrode Openings for Capacity and Resistance
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Solution Overview
Problem
The existing all-solid secondary battery laminated structure struggles to achieve high discharge capacity per unit volume while maintaining low internal resistance, due to issues with current collector usage and solid electrolyte layer thickness, leading to short-circuiting and reduced output current.
Innovation Solution
The battery design incorporates first and second electrode layers with solid electrolyte layers in between, featuring openings that allow electron transfer between the electrode layers, eliminating the need for current collectors and enabling thicker electrode layers and thinner solid electrolyte layers, thereby enhancing discharge capacity and reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current collector layers are formed in each electrode layer, then structural integrity and electron collection are improved, but discharge capacity per unit volume decreases due to the volume occupied by non-active current collector materials
Solution Approach 1:
The patent removes the current collector layer from the electrode structure, extracting the non-active material that occupied volume without contributing to discharge capacity. The electrode layers are designed to function without separate current collectors, thereby increasing the proportion of active material and improving discharge capacity per unit volume.
Solution Approach 2:
The electrode layers are designed to perform multiple functions simultaneously: they provide both the structural framework and the electron collection function previously separated into distinct current collector layers. This multi-functionality eliminates the need for separate current collectors while maintaining structural integrity and electrical conductivity.
2Quantity of substance
If current collector layers are removed to increase discharge capacity per unit volume, then active material volume increases, but internal resistance increases and output current decreases due to longer electron travel paths
Solution Approach 1:
The patent introduces openings that penetrate through the electrode layers in the thickness direction, creating a three-dimensional electron transport pathway. This dimensional change allows electrons to travel shorter distances through the electrode thickness while maintaining high discharge capacity, thereby reducing internal resistance and improving output current.
Solution Approach 2:
The electrode layers are segmented by introducing openings that divide the continuous structure into regions. This segmentation creates multiple electron transport pathways and reduces the average electron travel distance, thereby maintaining low internal resistance while maximizing the volume of active material.
3Quantity of substance
If solid electrolyte layers are made thin to increase discharge capacity per unit volume, then electrode layer thickness can be increased, but the solid electrolyte green sheet layer tears during removal from support films
Solution Approach 1:
The patent introduces openings in the electrode layers before lamination, which provides structural support points that prevent the thin solid electrolyte green sheet from tearing during the removal process. This preliminary structural preparation enables manufacturing stability while maintaining thin electrolyte layer thickness.
Solution Approach 2:
The electrode layers have different structural properties in different regions: regions with openings provide localized structural support to the thin solid electrolyte layers, while other regions maintain continuous electrode material. This local quality variation enables both thin electrolyte layers and manufacturing stability.
4Quantity of substance
If electrode layers are made thick to increase discharge capacity per unit volume, then active material volume increases, but positive and negative electrodes short-circuit on the end surface of the green sheet group
Solution Approach 1:
The patent introduces openings that penetrate through the electrode layers in the thickness direction, creating a three-dimensional structure that prevents end-surface short-circuiting. This dimensional change allows thick electrode layers to be maintained while ensuring proper isolation between positive and negative electrodes through the opening structures.
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
This configuration results in a battery with significantly improved discharge capacity per unit volume and suppressed internal resistance, allowing for efficient electron transfer and increased output current without the need for current collectors.
Implementation Method 1
the second electrode layers present on both sides of the first electrode layer are in contact with each other on the inside of the first opening
Data Source
AI summary
An all-solid secondary battery has first electrode layers, and second electrode layers laminated on both sides of the first electrode layer with solid electrolyte layers placed in between, wherein at least one first opening is provided which penetrates the first electrode layer and the solid electrolyte layers adjacent to the first electrode layer, and the second electrode layers present on both sides of the first electrode layer are in contact with each other on the inside of the first opening.