Hybrid Cathode Battery for Implantable Devices
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Solution Overview
Problem
Current battery designs for implantable medical devices, such as ICDs, face challenges in achieving high energy density and high discharge rate capability while also serving as an end-of-life indicator, with existing cathode materials like silver vanadium oxide and sub-fluorinated carbon fluoride having limitations in manufacturing complexity and discharge rate capability.
Innovation Solution
A hybrid electrode configuration is introduced, featuring a stacked arrangement of cathodes with sub-fluorinated carbon fluoride and silver vanadium oxide as cathode active materials, alternated with anodes and separators, which enhances energy density, discharge rate capability, and provides an end-of-life indicator by maintaining a consistent discharge voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sub-fluorinated carbon fluoride (CFx) is used as cathode active material, then energy density is improved, but discharge rate capability deteriorates
Solution Approach 1:
The cathode is divided into multiple discrete layers with alternating materials (CFx layers and SVO layers) rather than using a single homogeneous material. This segmentation allows each layer type to contribute its specific advantages: CFx layers provide high energy density while SVO layers provide high discharge rate capability, and the alternating structure enables both functions to operate simultaneously during battery discharge.
2Speed
If silver vanadium oxide (SVO) is used as cathode active material, then discharge rate capability and EOL indicator are improved, but energy density deteriorates
Solution Approach 1:
The cathode is divided into multiple discrete layers with alternating materials (CFx layers and SVO layers) rather than using a single homogeneous material. This segmentation allows each layer type to contribute its specific advantages: CFx layers provide high energy density while SVO layers provide high discharge rate capability, and the alternating structure enables both functions to operate simultaneously during battery discharge.
3Speed
If three-layer cathode design with two current collectors is used, then discharge rate capability is improved, but manufacturing complexity increases
Solution Approach 1:
The cathode is divided into multiple discrete layers with alternating materials (CFx layers and SVO layers) rather than using a single homogeneous material. This segmentation allows each layer type to contribute its specific advantages: CFx layers provide high energy density while SVO layers provide high discharge rate capability, and the alternating structure enables both functions to operate simultaneously during battery discharge.
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 hybrid battery configuration achieves higher energy density and discharge rate capability, allowing for precise tailoring of usable battery capacity and providing an effective end-of-life indicator, thus addressing the limitations of existing designs.
Implementation Method 1
Electrochemical cells or batteries are used as the power source in many applications
Implementation Method 2
some form of electrolyte 108 in contact with anode 104 and cathode 102
Data Source
AI summary
Batteries having hybrid electrode configurations are disclosed herein. In one embodiment, a battery comprises an electrode assembly. The electrode assembly comprises a first cathode including a first cathode active material, a second cathode including a second cathode active material different from the first cathode active material, a first anode disposed between the first cathode and the second cathode, a first separator interposed between the first cathode and the first anode, and a second separator interposed between the second cathode and the first anode.