Cellulose Binder Innovation for Solid-State Battery Performance
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Summary
Problems
All-solid-state secondary batteries face issues with microgel formation due to strong hydrophobicity of cellulose polymers, leading to electrode defects and reduced electrical performance, especially when using traditional binder compositions without sufficient lithium ion transfer paths.
Innovation solutions
A cellulose derivative composition with multi-substituted monovalent metal ions, such as sodium and lithium, is used to suppress hydrophobicity and enhance solubility, providing a lithium ion transfer path through the binder, even in the absence of an electrolyte, thereby reducing microgel formation and improving conductive properties.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If traditional binder compositions are used, then manufacturing simplicity is maintained, but microgel formation occurs due to strong hydrophobicity of cellulose polymers, leading to electrode defects and reduced electrical performance
Why choose this principle:
The patent changes the chemical parameters of the cellulose polymer by introducing metal ion substituents (sodium, lithium, potassium, rubidium, or cesium) at positions 2, 3, and/or 6 of the glucose unit. This parameter change modifies the hydrophobicity of the cellulose, suppressing microgel formation while maintaining binder functionality. The metal ion substitution transforms the chemical properties to reduce harmful microgel aggregation.
Principle concept:
If traditional binder compositions are used, then manufacturing simplicity is maintained, but microgel formation occurs due to strong hydrophobicity of cellulose polymers, leading to electrode defects and reduced electrical performance
Why choose this principle:
The patent creates a composite binder material by combining cellulose polymer with multiple metal ion substituents. This composite structure integrates the mechanical binding properties of cellulose with the hydrophilic characteristics introduced by metal ions, achieving both defect reduction and electrical performance improvement without sacrificing manufacturing simplicity.
Application Domain
Data Source
AI summary:
A cellulose derivative composition with multi-substituted monovalent metal ions, such as sodium and lithium, is used to suppress hydrophobicity and enhance solubility, providing a lithium ion transfer path through the binder, even in the absence of an electrolyte, thereby reducing microgel formation and improving conductive properties.
Abstract
Provided is a cellulose derivative composition for an all-solid-state secondary battery binder including a compound represented by Formula 1 below according to the inventive concept. In Formula 1, R 1 , R 1 ′, R 2 , R 2 ′, R 3 , and R 3 ′ are each independently any one among a carboxymethyl group, a sulfur substituent, or a phosphorus substituent, in which a monovalent metal is substituted or hydrogen, wherein R 1 , R 2 , and R 3 is —CH 2 COOX, , SO 3 X, —PO 3 X or —PO 3 X 2 where X may be any one among sodium (Na), potassium (K), rubidium (Rb), or cesium (Cs). R 1 ′, R 2 ′, and R 3 ′ is —CH 2 COOY, —SO 3 Y, —PO 3 Y or —PO 3 Y 2 where Y may be lithium (Li).