Doped Silver Cathode Resistivity Reduction
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Solution Overview
Problem
Traditional battery cathodes suffer from elevated impedance and internal resistance, which hinder battery performance and restrict capacity retention over charge cycles.
Innovation Solution
A cathode formed by doping silver materials with trivalent dopants such as gallium, indium, aluminum, or boron, at concentrations between 0.25 wt% to 10 wt%, to reduce resistivity and enhance cycle life, using powders with mean particle diameters of 20 μm or less and binders like PTFE or PVDF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cathode materials are used, then the battery can be manufactured with conventional processes, but the cathode exhibits elevated impedance and internal resistance that restrict battery performance
Solution Approach 1:
The patent applies parameter changes by doping the silver cathode material with trivalent dopants (such as Al³⁺, Ga³⁺, In³⁺) at controlled concentrations (0.25-10 wt%). This substitution of cations modifies the electronic and ionic transport properties of the cathode, reducing impedance and internal resistance while maintaining structural integrity during charge-discharge cycles
Solution Approach 2:
The patent creates a composite cathode material by combining silver (Ag) with trivalent dopant oxides or hydroxides. This composite structure leverages the high conductivity of silver while the dopant introduces beneficial defects and modifies the crystal lattice to reduce impedance and improve overall battery performance
2Duration of action of stationary object
If traditional cathode materials are used, then the manufacturing process remains simple, but the battery shows increased hindrance on performance as charge cycles progress
Solution Approach 1:
The doping concentration of trivalent dopants (0.25-10 wt%) is optimized to maintain structural stability over repeated charge-discharge cycles. The trivalent cations substitute for silver ions in the crystal lattice, creating a more robust structure that resists degradation and maintains performance retention after 100-400 cycles
Solution Approach 2:
The trivalent dopant acts as a structural cushioning agent that prevents lattice collapse and maintains cathode integrity during cycling. The dopant creates a more stable crystal structure that anticipates and prevents degradation mechanisms that would otherwise occur in undoped silver cathodes
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 doped silver cathodes exhibit improved resistivity, maintaining at least 80% capacity over 100 to 400 cycles, significantly enhancing battery performance and cycle life compared to undoped counterparts.
Implementation Method 1
a cathode formed by doping a cathode material with a dopant that imparts the cathode with one or more improved properties
Data Source
AI summary
The present invention provides novel cathodes having a reduced resistivity and other improved electrical properties. Furthermore, this invention also presents methods of manufacturing novel electrochemical cells and novel cathodes. These novel cathodes comprise a silver material that is doped with a trivalent species.