Li/CFx Battery Cathode Stabilization via Base Treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Li/CFx batteries used in implantable medical devices experience increased resistance due to degradation of the electrolyte solvent, leading to lower loaded voltage, which affects the performance and stability of the batteries over time.
Innovation Solution
Treating the CFx material with a base during the cathode formation process to neutralize acidic sites, thereby preventing degradation of the electrolyte solvent and maintaining battery resistance stability during storage and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Li/CFx batteries are stored for extended periods, then the battery resistance increases, but the loaded voltage decreases
Solution Approach 1:
The patent applies preliminary action by treating the CFx cathode material with a base solution during the formation process before storage. This pre-treatment neutralizes acidic sites on the CFx surface, preventing subsequent electrolyte degradation and resistance increase during storage, thereby maintaining both resistance stability and voltage levels over time.
2Reliability
If the electrolyte solvent degrades, then the battery resistance increases, but the performance deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by using a base treatment to neutralize acidic sites on the CFx cathode material before storage. This pre-neutralization prevents the acidic sites from catalyzing electrolyte solvent degradation, thereby protecting against resistance increase and performance deterioration simultaneously.
3Reliability
If the battery is stored at elevated temperatures, then the resistance increases faster, but the voltage drops more significantly
Solution Approach 1:
The base treatment during formation creates a stable surface chemistry on the CFx cathode that is resistant to temperature-accelerated degradation. This preliminary stabilization allows the battery to maintain both resistance and voltage levels even when stored at elevated temperatures, where untreated batteries would degrade more rapidly.
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 treatment process enhances the stability and performance of Li/CFx batteries by reducing resistance and maintaining voltage levels, ensuring reliable operation over multiple storage periods and elevated temperatures.
Implementation Method 1
treating the CFx material with a base during the formation of a CFx cathode
Data Source
AI summary
A method includes treating a CFx material with a base during the formation of a CFx cathode; and assembling the treated CFx material into a cathode electrode and assembling the cathode electrode with a lithium anode electrode and an electrolyte into a cell.