Lithium Battery Cathode Composite for Implantable Devices
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Solution Overview
Problem
Implantable medical devices require batteries with high power and capacity density while maintaining a small volume to ensure effective therapy delivery and prolonged device longevity, but existing solutions struggle to balance these factors effectively.
Innovation Solution
The development of an implantable medical device battery with a lithium anode, a metal oxide cathode, and a separator, where the cathode material includes a mixture of silver vanadium oxide and carbon monofluoride, and a slurry coating method is used to achieve a high therapeutic power and capacity density, with a total volume of no greater than 6.0 cubic centimeters and a therapeutic power of at least 0.11 Watt per joule of therapeutic energy delivered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery volume is reduced to ensure small implantable device size, then the device can be more minimally invasive and patient-friendly, but the power capacity and energy storage are reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the battery by using a lithium anode instead of traditional zinc or silver oxide, and employs a specific cathode material composition (silver vanadium oxide and carbon monofluoride mixture) to achieve higher energy density per unit volume, thereby maintaining high power capacity in a reduced volume
Solution Approach 2:
The cathode uses a composite material consisting of silver vanadium oxide and carbon monofluoride in specific proportions, combining the high voltage characteristics of silver vanadium oxide with the high capacity contributions from carbon monofluoride to achieve superior energy density in a compact form factor
2Volume of moving object
If the battery volume is reduced, then the device size is minimized, but the therapeutic power delivery capability is reduced
Solution Approach 1:
The patent optimizes the cathode material composition with silver vanadium oxide providing high voltage (approximately 3.0V vs lithium) and carbon monofluoride contributing high capacity, creating a chemical parameter combination that delivers high therapeutic power density in a small volume battery
Solution Approach 2:
The slurry coating method creates a uniform thin layer of cathode material on the current collector, ensuring optimal local distribution of active materials and conductive agents throughout the battery structure, which maximizes power delivery efficiency per unit volume
3Volume of moving object
If the cathode thickness is reduced to decrease battery volume, then the device becomes more compact, but the capacity density and power output are reduced
Solution Approach 1:
The patent achieves high capacity density in a thin cathode by optimizing the slurry composition and coating parameters, creating a uniform thin layer with optimal material distribution that maximizes the active material content per unit volume while maintaining electrical conductivity and ion transport pathways
Solution Approach 2:
The cathode is constructed as a thin film through slurry coating, allowing the active materials to be distributed in a compact thin layer format that reduces overall battery volume while maintaining high capacity density through optimized material composition and uniform coating
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 achieves a therapeutic power of at least 0.11 Watt for every joule of therapeutic energy delivered over its useful life, with a therapeutic capacity density of at least 0.08 ampere hours per cubic centimeter, supporting extended device operation and improved patient outcomes.
Implementation Method 1
a battery of relatively small volume but of relatively high power (reported as therapeutic power) and relatively high capacity (reported as capacity density)... an anode comprising lithium; a cathode having a total uniform thickness of less than 0.014 inch; a separator between the anode and the cathode; and an electrolyte contacting the anode, the cathode, and the separator
Implementation Method 2
a slurry coating method is used to achieve a high therapeutic power and capacity density
Data Source
AI summary
Implantable medical devices, implantable medical device systems that include such implantable medical devices, and implantable medical device batteries, as well as methods of making. Such devices can include a battery of relatively small volume but of relatively high power (reported as therapeutic power) and relatively high capacity (reported as capacity density).