Silver Nanocomposite Cathode for Rechargeable Battery Capacity Retention
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Solution Overview
Problem
Traditional rechargeable battery cathodes suffer from reduced charge capacity, inefficiency, and increased impedance over charge cycles, leading to decreased battery performance and lifespan.
Innovation Solution
A novel cathode material is developed by combining silver with a stabilizing agent having a mean particle diameter of less than 250 nm, which enhances Coulombic efficiency and maintains charge capacity over multiple charge cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cathode materials are used, then the battery can be manufactured with conventional materials and processes, but the cathode loses charge capacity over charge cycles and exhibits Coulombic inefficiency and elevated impedance
Solution Approach 1:
The patent applies composite materials by combining silver with semiconductor particles (such as TiO2, ZnO, SiO2, or ZrO2) to form a cathode material that exhibits improved charge capacity retention and Coulombic efficiency. The composite structure allows the silver to provide high capacity while the semiconductor particles stabilize the electrode during charge cycles, preventing the capacity loss and impedance increase seen in traditional cathode materials.
2Reliability
If traditional cathode materials are used, then the manufacturing process is simple and conventional, but the Coulombic efficiency is low and impedance is elevated
Solution Approach 1:
The invention uses composite materials comprising silver and semiconductor particles to achieve high Coulombic efficiency (>98%) while managing the increased complexity of cathode composition. The semiconductor particles (TiO2, ZnO, SiO2, ZrO2) are integrated with silver to form a stable composite structure that maintains low impedance and high efficiency throughout charge cycles.
Solution Approach 2:
The patent applies parameter changes by controlling the particle size of semiconductor materials to nanoscale dimensions (250 nm or less, preferably 100 nm or less). This size reduction increases the surface area and reactivity of the semiconductor particles, enhancing their ability to stabilize the silver cathode and improve Coulombic efficiency while managing the complexity of the composite structure.
3Productivity
If traditional cathode materials are used, then the initial manufacturing cost is lower, but the battery performance degrades over charge cycles
Solution Approach 1:
The patent employs composite materials of silver with nanoscale semiconductor particles (TiO2, ZnO, SiO2, ZrO2) to create a cathode that maintains high battery performance over extended periods. The semiconductor components stabilize the electrode structure during charge cycles, preventing performance degradation and extending the operational lifespan of the battery.
Solution Approach 2:
The invention utilizes parameter changes by reducing semiconductor particle sizes to 250 nm or less (preferably 100 nm or less), which increases surface area and enhances the stabilizing effect during charge cycles. This nanoscale modification allows the cathode to maintain high productivity and performance over thousands of charge cycles, significantly extending battery shelf life.
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 cathode material achieves a Coulombic efficiency of greater than 98% and retains a substantial charge capacity for over 70 charge cycles, improving battery performance and lifespan.
Implementation Method 1
a stabilizing agent having a mean particle diameter of less than 250 nm
Implementation Method 2
the cathode is typically an electronically conducting host into which positive ions are inserted reversibly from the electrolyte as a guest species and are charge-compensated by electrons from the external circuit
Data Source
AI summary
The present invention provides cathodes, methods of making cathodes, and electrochemical cells (e.g., batteries) that employ these cathodes having improved properties over traditional cathodes, methods, or electrochemical cells.