All Solid Battery Collector Layer Pd Graphite Composite
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Solution Overview
Problem
All solid batteries face issues such as electrolyte leakage, high costs due to expensive materials, and performance degradation due to material reactions and uneven current density, particularly with fiber carbon dispersion and fine particle carbon oxidation during firing.
Innovation Solution
An all solid battery design incorporating a phosphoric acid salt-based solid electrolyte with Pd and board-shaped graphite carbon in the electric collector layers, maintaining a volume ratio of 20:80 to 80:20, and a manufacturing method involving ceramic grains, green sheets, and firing to achieve optimal performance and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Pd is used as the electric collector layer, then chemical stability and performance are improved, but manufacturing cost increases
Solution Approach 1:
The patent uses a composite electric collector layer comprising Pd particles dispersed in a graphite carbon matrix. This composite structure combines the chemical stability of Pd with the cost-effectiveness and conductivity of graphite carbon, resolving the contradiction between reliability and manufacturing cost.
Solution Approach 2:
The patent replaces pure Pd with a composite material where graphite carbon (a cheaper material) serves as the primary matrix, reducing manufacturing cost while maintaining sufficient performance through the synergistic combination with Pd particles.
2Ease of manufacture
If fiber carbon is used in the electric collector layer, then cost is reduced, but dispersion uniformity and current density distribution deteriorate
Solution Approach 1:
The patent uses graphite carbon as a cost-effective alternative to fiber carbon, achieving uniform dispersion and good current density distribution at lower manufacturing cost.
Solution Approach 2:
The patent achieves homogeneous dispersion of conductive materials in the electric collector layer by using graphite carbon particles that disperse uniformly throughout the polymer matrix, ensuring consistent current density distribution across the battery surface.
3Ease of manufacture
If fine particle carbon is used in the electric collector layer, then cost is reduced, but oxidation during firing and performance deteriorate
Solution Approach 1:
The patent uses graphite carbon as a cost-effective alternative to fine particle carbon, achieving oxidation resistance during firing while maintaining good performance characteristics.
Solution Approach 2:
The patent changes the particle morphology and size parameters of the carbon material from fine particles to plate-like graphite particles with specific size ranges (0.1-10 μm), which provides better oxidation resistance during firing while maintaining cost-effectiveness.
4Ease of manufacture
If Ag is used in the electric collector layer, then cost is reduced compared to Pd, but diffusion into the electrolyte during firing occurs
Solution Approach 1:
The patent uses graphite carbon as a cost-effective alternative to Ag, eliminating the diffusion problem while maintaining electrical conductivity and chemical stability.
Solution Approach 2:
The patent uses a composite of Pd and graphite carbon that prevents the diffusion issues experienced with Ag while maintaining cost-effectiveness and material stability during the firing process.
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 battery achieves preferable performance, suppresses shorts between electrodes, and reduces costs by using Pd and board-shaped graphite carbon, ensuring efficient electron conduction and high energy density while maintaining mechanical strength and adhesive properties.
Implementation Method 1
firing the multilayer structure
Implementation Method 2
efficient electron conduction
Data Source
AI summary
An all solid battery includes: a solid electrolyte layer; a first electrode layer that is formed on a first main face of the solid electrolyte layer; a first electric collector layer that is formed on a face of the first electrode layer, the face being opposite to the first main face; a second electrode layer that is formed on a second main face of the solid electrolyte layer; and a second electric collector layer that is formed on a face of the second electrolyte layer, the face being opposite to the second main face, wherein at least one of the first electric collector layer and the second electric collector layer includes Pd and board-shaped graphite carbon, wherein a volume ratio of Pd and the board-shaped graphite carbon in the at least one of the first electric collector layer and the second electric collector layer is 20:80 to 80:20.