Polysiloxane Binder for Thermal Battery Electrodes
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Solution Overview
Problem
Current thermal battery designs suffer from low energy density, high cost, and inefficiencies due to excess material in pellet-based components, which result in reduced power output and increased weight and volume, largely unchanged since the 1960s.
Innovation Solution
The use of a processed polysiloxane resin binder for electrode and separator components, enabling the fabrication of thin, conformal layers that replace traditional pellet-based structures, allowing for improved power and energy density through automated casting technologies and robust bonding agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pellet-based components are used to ensure mechanical integrity, then structural strength is improved, but energy density and power output deteriorate due to excess material thickness
Solution Approach 1:
The patent changes the physical and chemical parameters of the binder material from traditional organic binders to inorganic polysiloxane-based binders that can withstand thermal battery operating temperatures (352-600°C). This parameter change enables the use of much thinner component layers (reducing excess material) while maintaining mechanical integrity at high temperatures, directly resolving the contradiction between strength and energy density
Solution Approach 2:
The patent employs composite materials consisting of active ingredients (cathode/anode materials) combined with inorganic binder materials (polysiloxane resins, glass ceramics, ceramic powders). This composite approach creates components that are both mechanically strong and chemically stable at high temperatures, allowing thin-layer construction without sacrificing structural integrity, thus improving energy density while maintaining strength
2Strength
If excess material is included in pellets to facilitate mechanical integrity, then structural strength is improved, but power output and Coulombic efficiency deteriorate
Solution Approach 1:
By changing the binder material parameters to high-temperature stable inorganic materials, the patent enables thin-layer components that reduce excess material. This reduces internal resistance and improves power output while maintaining mechanical integrity through the superior thermal stability of inorganic binders
Solution Approach 2:
The patent applies local quality by using inorganic binder materials specifically in regions where high-temperature stability is critical (at the component level within pellets), allowing optimized material distribution that reduces excess material while maintaining local mechanical integrity where needed most
3Ease of manufacture
If traditional pellet processing technology is used, then manufacturing simplicity is maintained, but productivity and energy density deteriorate due to inability to produce thin components
Solution Approach 1:
The patent changes the binder material parameters to enable new manufacturing approaches. The inorganic binder materials allow for slurry casting and other thin-film fabrication techniques, transitioning from traditional pellet pressing to methods that can produce thin, uniform layers with high productivity and improved energy density
4Strength
If thicker pellets are used to ensure mechanical integrity, then structural strength is improved, but weight and volume increase
Solution Approach 1:
By changing the binder material to high-temperature stable inorganic materials, the patent enables the use of much thinner component layers that maintain mechanical integrity at operating temperatures. This directly reduces the weight of battery components while maintaining structural strength, resolving the contradiction between strength and weight
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
This approach enhances power and energy density, reduces production costs, and improves structural integrity, enabling higher g-force tolerance and thermal stability while eliminating the need for excessive materials, thus overcoming the limitations of traditional pellet processing.
Implementation Method 1
The processed polysiloxane resin is formed by crosslinking at a relatively low temperature followed by partial oxidation at a higher temperature
Implementation Method 2
The processed polysiloxane resin is formed by crosslinking at a relatively low temperature followed by partial oxidation at a higher temperature
Implementation Method 3
The processed polysiloxane is thermally stable in non-oxidizing environments
Data Source
AI summary
A processed polysiloxane resin binder for use in electrochemical components and the method for fabricating components with the binder. The binder comprises processed polysiloxane resin that is partially oxidized and retains some of its methyl groups following partial oxidation. The binder is suitable for use in electrodes of various types, separators in electrochemical devices, primary lithium batteries, electrolytic capacitors, electrochemical capacitors, fuel cells and sensors.