Solid-State Battery Eliminating Positive Electrode Current Collecting Layer
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Solution Overview
Problem
The existing solid-state battery designs face issues with yield and quality deterioration, increased manufacturing costs due to multiple stacking times, and a decrease in theoretical capacity ratio and capacity characteristics when the positive electrode current collecting layer is eliminated, leading to frequent lithium dendrite precipitation and short circuits.
Innovation Solution
A solid-state battery design that eliminates the positive electrode current collecting layer by extending the positive electrode layer to the terminal and using a conductive carbon material in the positive electrode layer, with a positive electrode current collecting portion adjacent to the positive electrode layer to maintain electrical connectivity, thereby reducing stacking times and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the positive electrode current collecting layer is eliminated to reduce stacking times, then manufacturing cost is reduced and productivity is improved, but electron conductivity of the positive electrode layer decreases and theoretical capacity ratio is decreased
Solution Approach 1:
The patent merges the positive electrode layer and positive electrode current collecting layer into a single integrated structure. The positive electrode layer directly contacts the positive electrode terminal without an intermediate current collecting layer, thereby reducing the number of stacking operations while maintaining electron conductivity through the conductive carbon material network embedded in the positive electrode layer itself.
Solution Approach 2:
The positive electrode layer is designed to serve dual functions: as the active electrode material layer and as the current collecting layer. By incorporating conductive carbon material throughout the positive electrode layer, it gains electron conductivity functionality normally provided by a separate current collecting layer, eliminating the need for additional layers and stacking operations.
2Device complexity
If the positive electrode current collecting layer is eliminated to reduce manufacturing complexity, then device complexity is reduced and ease of manufacture is improved, but current concentration at the end portion of the negative electrode layer causes lithium dendrite precipitation and short circuits
Solution Approach 1:
The patent applies local quality by concentrating conductive carbon material at specific locations within the positive electrode layer, particularly near the end portions where current collection occurs. This localized enhancement of electron conductivity ensures uniform current distribution across the electrode interface, preventing current concentration that would lead to lithium dendrite formation and short circuits, while maintaining a simplified single-layer structure.
Solution Approach 2:
The conductive carbon material acts as an intermediary within the positive electrode layer, facilitating uniform electron distribution and current collection. It mediates between the positive electrode active material and the positive electrode terminal, ensuring balanced current flow that prevents localized current concentration and subsequent lithium dendrite precipitation at the negative electrode layer end portions.
3Productivity
If the positive electrode current collecting layer is eliminated to improve yield and quality, then manufacturing yield is improved and quality is improved, but the capacity that can be actually taken out is significantly lower than the theoretical capacity
Solution Approach 1:
The patent incorporates conductive carbon material into the positive electrode layer during the initial layer formation process, before electrode assembly and activation. This preliminary integration of conductive additives ensures optimal electron conductivity and active material utilization from the start, maximizing the theoretical capacity ratio that can be practically achieved while maintaining high manufacturing yield through reduced stacking operations.
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 improves yield and quality, reduces manufacturing costs, and maintains the theoretical capacity ratio and capacity characteristics by ensuring efficient electron conductivity and preventing lithium dendrite formation and short circuits.
Implementation Method 1
a positive electrode layer, the positive electrode layer containing a conductive carbon material
Implementation Method 2
a solid-state electrolyte layer interposed between the positive electrode layer and the negative electrode layer in a stacking direction
Data Source
AI summary
A solid-state battery that includes: a solid-state battery laminate including at least one battery constituent unit including: a positive electrode layer, the positive electrode layer containing a conductive carbon material; a positive electrode current collecting portion arranged at an end surface of the positive electrode layer; a negative electrode layer; and a solid-state electrolyte layer interposed between the positive electrode layer and the negative electrode layer in a stacking direction thereof; a positive electrode terminal electrically connected to the positive electrode current collecting portion; and a negative electrode terminal electrically connected to the negative electrode layer.