Implantable Battery Cathode with High Fluorine CFx
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Solution Overview
Problem
Implantable medical device batteries face challenges in achieving high efficiency, stability, and reduced manufacturing costs, with existing technologies experiencing capacity loss and increased resistance during long-term discharge.
Innovation Solution
A battery cell design utilizing a cathode composed of silver vanadium oxide (SVO) and fluorinated carbon (CFx) with a high fluorine content, where the fluorine percentage is greater than or equal to 61 weight percent, along with a specific carbon precursor and fluorination process to minimize impurities and enhance electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cathode materials are used in implantable medical device batteries, then manufacturing costs are reduced, but capacity loss and increased resistance occur during long-term discharge
Solution Approach 1:
The cathode is constructed as a composite material combining silver vanadium oxide (SVO) with fluorinated carbon (CFx) where fluorine comprises at least 61 weight percent. This composite structure provides both high electrochemical performance with minimal capacity loss and acceptable manufacturing cost, resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The invention changes the chemical composition parameters of the cathode by incorporating fluorinated carbon with high fluorine content (≥61 wt%). This parameter change results in a cathode that maintains stable resistance and capacity over long-term discharge at body temperature, achieving improved reliability without excessive manufacturing cost.
2Loss of energy
If battery efficiency is increased through advanced materials, then capacity loss is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The fluorinated carbon composite cathode combines SVO active material with CFx conductive additive in a simplified manufacturing process. The composite structure minimizes capacity loss through enhanced electrochemical stability while avoiding complex multi-step synthesis procedures, thus resolving the contradiction between energy loss reduction and manufacturing complexity.
3Reliability
If fluorine content in CFx is increased to improve electrochemical performance, then resistance stability improves, but manufacturing cost increases
Solution Approach 1:
The invention optimizes the fluorine content parameter to be at least 61 weight percent, which provides sufficient resistance stability during long-term discharge while maintaining acceptable manufacturing cost. This specific parameter threshold resolves the contradiction by identifying the minimum effective fluorine content needed for performance.
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 cell exhibits excellent chemical and thermal stability, low and stable resistance during long-term discharge, and high capacity per unit volume, with reduced manufacturing costs and minimal capacity loss over three years or more at body temperature.
Implementation Method 1
The electrolyte is a medium that facilitates ionic transport and forms a conductive pathway between the anode and cathode
Implementation Method 2
forms a conductive pathway between the anode and cathode
Implementation Method 3
The cathode is comprised of silver vanadium oxide (SVO) and fluorinated carbon (CFx)... exhibits low and stable battery cell resistance during long term discharge
Data Source
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AI summary
A battery cell in an implantable medical device is presented. The battery cell includes an anode, a cathode, an insulator therebetween, and an electrolyte. The cathode includes silver vanadium oxide and fluorinated carbon (CFx). The CFx includes fluorine at greater than or equal to 61 percentage (%) by weight.