All-solid-state Battery Connecting Conductor Layer Design
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Solution Overview
Problem
All-solid-state batteries face increased internal resistance due to electrical resistance at connected sections between collectors and terminals, and complex production steps, as well as potential copper sulfide formation issues with sulfur-containing solid electrolytes, which complicates replacement of defective layers and reduces production yield.
Innovation Solution
An all-solid-state battery design featuring a structural unit cell with a positive electrode collector layer, positive electrode active material layer, solid electrolyte layer, negative electrode active material layer, and negative electrode collector layer, where a connecting conductor layer with low electric resistivity is added on the surface of the collector layers, allowing for alternately layered stacks and easy separation of defective units, using materials like copper and aluminum for the connecting conductor and stainless steel or nickel for the negative electrode collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collectors are directly connected to terminals, then electrical connection is established, but internal resistance increases due to resistance at connected sections
Solution Approach 1:
A connecting conductor layer is introduced as an intermediary between the collectors and terminals. This connecting conductor layer has lower electrical resistance than the collectors, thereby reducing the internal resistance at the connection sections while maintaining reliable electrical connection.
2Reliability
If sulfur-containing solid electrolyte is used with copper collector, then good conductivity is achieved, but copper sulfide formation increases internal resistance
Solution Approach 1:
The connecting conductor layer acts as an intermediary that is positioned between the copper collector and the sulfur-containing solid electrolyte. This connecting conductor layer has lower resistance than the copper collector and prevents direct contact between copper and sulfur, thereby preventing copper sulfide formation while maintaining good conductivity.
3Strength
If entire layered stack is joined, then structural integrity is achieved, but defective layer portions cannot be replaced and yield decreases
Solution Approach 1:
The battery structure is segmented into separate functional components: collectors, connecting conductor layers, and solid electrolyte layers. This segmentation allows individual layers to be replaced independently without requiring replacement of the entire stack, thereby improving production yield while maintaining structural integrity through the connecting conductor layers.
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 design reduces internal resistance, increases charge-discharge capacity per volume, and simplifies production by enabling easy replacement of defective structural unit cells, improving yield and energy density while maintaining low electrical resistance.
Implementation Method 1
a connecting conductor layer which is layered on the surface of the positive electrode collector layer side and/or the negative electrode collector layer side of the structural unit cell
Data Source
AI summary
The present disclosure provides an all-solid-state battery with a novel structure. The all-solid-state battery of the disclosure is an all-solid-state battery having at least one structural unit cell comprising a positive electrode collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer and a negative electrode collector layer stacked in that order, wherein a connecting conductor layer is layered on the surface of the positive electrode collector layer side and/or the negative electrode collector layer side of the structural unit cell. The electric resistivity of the connecting conductor layer is lower than the electric resistivity of the positive electrode collector layer or negative electrode collector layer on which the connecting conductor is layered. The electric resistivity of the connecting conductor layer is 1×10−6 Ωm or lower.