Cross-Linkable Binder Resin Balancing Elution Resistance and Swelling
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Solution Overview
Problem
The polymer binder used in solid electrolytes is not suitable for batteries with electrolytic solutions, leading to potential elution into the electrolytic solution.
Innovation Solution
A cross-linkable resin composition containing specific copolymer units with reactive groups, allowing for a binder resin and polymer thin film that exhibits low elution and high swelling properties in electrolytic solutions, enhancing adhesion and binding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymer binder containing three-dimensional cross-linked aliphatic polycarbonate is used, then the binder provides good adhesion and binding properties, but the binder may elute into the electrolytic solution when used in batteries with electrolytic solutions
Solution Approach 1:
The invention changes the chemical structure parameters of the polycarbonate by introducing specific reactive groups (carboxyl, hydroxyl, or amino groups) at controlled ratios (0.3-20.0 mol%). This allows the polymer to crosslink in situ within the battery, transforming from a non-crosslinked structure that elutes to a crosslinked structure that resists elution while maintaining adhesion properties
Solution Approach 2:
The reactive groups are pre-introduced into the polymer chain during synthesis, preparing the binder for subsequent crosslinking reactions. This preliminary preparation enables the binder to automatically crosslink when exposed to the battery environment, preventing elution before it becomes a problem
2Reliability
If the polymer binder is cross-linked to prevent elution, then elution resistance improves, but the swelling properties in electrolytic solution may be reduced
Solution Approach 1:
The invention carefully controls the ratio of reactive groups (0.3-20.0 mol%) to achieve optimal crosslinking density. This controlled parameter adjustment ensures sufficient crosslinking for elution resistance while maintaining enough chain mobility and free volume for electrolyte penetration and swelling
Solution Approach 2:
The crosslinking occurs locally at specific sites where reactive groups are positioned along the polymer chain. This localized crosslinking creates a network structure that prevents elution while leaving other regions of the polymer accessible to electrolyte swelling
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 solution provides a resin composition with low elution and high swelling properties, improving adhesion to metal foils and inorganic materials, and inhibiting dendrite generation in batteries.
Implementation Method 1
A resin composition containing a copolymer, the copolymer including a constituent unit represented by a formula (1) below and 0.3 mol % or more and 20.0 mol % or less of a constituent unit represented by a formula (2) below
Implementation Method 2
a degree of swelling of the copolymer to a mixed solvent of ethylene carbonate and dimethyl carbonate in a volume ratio of 1:1 is 100% or more
Data Source
AI summary
A resin composition containing a copolymer, the copolymer including a constituent unit represented by a formula (1) below and 0.3 mol % or more and 20.0 mol % or less of a constituent unit represented by a formula (2) below,where, in the formulae (1) and (2): R1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; L1 and L2 are each independently a single bond or an alkylene group having 1 to 3 carbon atoms; and X1 is a reactive group selected from groups represented by a structural formula (2-1) and a structural formula (2-2) below.