Battery Binder Resin Composition for Ion-Conductive Adhesion
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Solution Overview
Problem
Conventional binders for batteries, such as polyvinylidene fluoride and carboxymethylcellulose, increase ion conductivity but compromise bonding properties when used in excess, leading to decreased ion conductivity and capacity deterioration in battery layers.
Innovation Solution
A resin composition incorporating a compound with phosphorus and sulfur disulfide bonds, combined with a thermoplastic resin, is used as a binder to maintain bonding properties while preserving ion conductivity, even at higher binder concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binders (PVDF, CMC) are increased in amount to improve bonding properties, then bonding strength is improved, but ion conductivity decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by incorporating compounds with disulfide bonds (S-S) containing phosphorus and sulfur elements. This compositional parameter change enables the binder to maintain both adequate bonding strength and high ion conductivity, resolving the trade-off between bonding properties and ion conductivity that plagues conventional binders like PVDF and CMC.
Solution Approach 2:
The invention creates a composite binder system combining conventional binder materials with specially designed compounds containing disulfide bonds, phosphorus, and sulfur elements. This composite approach leverages the bonding capabilities of traditional binders while introducing new functional groups that provide ion conductivity pathways, thus achieving both strong bonding and maintained ion conductivity.
2Stability of the object's composition
If binder amount is increased to ensure layer integrity, then bonding properties are improved, but battery capacity deteriorates
Solution Approach 1:
By changing the chemical parameters of the binder to include disulfide bond-containing compounds with specific phosphorus and sulfur content, the invention achieves effective layer integrity at lower binder concentrations. The disulfide bonds provide strong intermolecular interactions for structural stability while the sulfur-containing groups facilitate ion transport, preventing capacity deterioration.
Solution Approach 2:
The invention extracts and utilizes the essential functional groups (disulfide bonds, phosphorus-sulfur compounds) needed for both bonding and ion conductivity, separating these functions from the bulk binder material. This allows the binder to perform multiple functions with minimal amount, preventing the capacity loss that occurs when excessive conventional binder is used.
3Ease of manufacture
If conventional binder materials are used to form battery layers, then ease of manufacture is improved, but ion conductivity and performance are compromised
Solution Approach 1:
The invention modifies the chemical parameters of the binder by incorporating compounds with disulfide bonds and phosphorus-sulfur moieties into conventional binder systems. This parameter adjustment maintains compatibility with existing manufacturing processes while dramatically improving ion conductivity, thus achieving better performance without sacrificing ease of manufacture.
Solution Approach 2:
The disulfide bond-containing phosphorus-sulfur compounds act as intermediary substances that bridge the gap between conventional binder materials and the requirement for high ion conductivity. These intermediary compounds integrate into the binder matrix and provide ion conduction pathways without disrupting the ease of manufacturing associated with conventional binder processing.
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 resin composition effectively enhances the bonding strength and ion conductivity of battery layers, preventing capacity deterioration and expanding the operating temperature range of batteries.
Implementation Method 1
a resin composition including a compound containing phosphorus and sulfur as constituent elements and having a disulfide bond
Implementation Method 2
the compound is obtained by oxidizing a raw material compound comprising phosphorus and sulfur as constituent elements with an oxidizing agent
Data Source
AI summary
A resin composition containing a compound including phosphorus and sulfur as constituent elements and having a disulfide bond, and a thermoplastic resin.