Doped Silver Cathode for Battery Impedance Reduction
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Solution Overview
Problem
Traditional battery cathodes suffer from elevated impedance and internal resistance, which hinder battery performance and lead to decreased performance over charge cycles.
Innovation Solution
A cathode formed by doping silver material with high valence dopants such as Nb, Mn, Re, V, Ta, W, Mo, or Cr, at concentrations between 0.01 mol% to 10 mol%, combined with a binder like PTFE or PVDF, to reduce impedance and enhance cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cathode materials are used, then the battery can operate, but the impedance and internal resistance are elevated, restricting battery performance
Solution Approach 1:
The patent applies parameter changes by doping silver cathode material with high-valence metal ions (such as Nb5+, Mo6+, W6+, Ta5+, V5+) at controlled concentrations (0.01-10 mol%). This substitution changes the electronic structure and electrical parameters of the cathode material, reducing impedance and internal resistance while maintaining structural stability during charge-discharge cycles.
Solution Approach 2:
The patent creates composite cathode materials by combining silver-based compounds (Ag, AgO, Ag2O, Ag2O3) with high-valence dopant oxides (Nb2O5, MoO3, WO3, Ta2O5, V2O5). This composite structure leverages the high conductivity of silver and the stabilizing effect of the high-valence dopants, achieving reduced impedance and improved cycle life.
2Duration of action of stationary object
If traditional cathode materials are used, then the battery can be manufactured, but performance decreases over charge cycles due to impedance
Solution Approach 1:
The doping process changes the electrochemical parameters of the cathode material, including electronic conductivity, ionic conductivity, and structural stability. The high-valence dopants create oxygen vacancies and enhance electron-hole recombination, improving charge transfer kinetics and maintaining performance consistency over 50+ charge cycles.
Solution Approach 2:
The high-valence dopants act as structural buffers that preemptively stabilize the cathode material against degradation during cycling. The dopants create a more robust crystal structure that resists phase transitions and maintains electrical conductivity throughout the battery's operational life, cushioning against performance decay.
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 cathode achieves improved battery performance by maintaining at least 60% of its rated capacity over 50 charge cycles, with reduced resistivity and increased cycle life, effectively addressing the limitations of traditional cathodes.
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 high valence early transition metal species.