Crosslinked Battery Binder for Low-Temperature Li-Ion Conduction
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Solution Overview
Problem
Conventional binders for lithium-ion batteries, such as styrene-acrylic emulsions, fail to improve low-temperature performance due to poor affinity with electrolyte solutions, leading to increased interface resistance and poor discharge performance at low temperatures.
Innovation Solution
A novel binder polymer is developed by polymerizing a mixture of aromatic alkenyl compounds, olefinic unsaturated carboxylic acids, and a fourth monomer containing an amine group and alkenyl groups, which transforms into a network structure, enhancing electrolyte resistance and lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional styrene-acrylic emulsion binder is used, then the binder provides basic binding function, but the affinity with electrolyte solution is poor leading to increased interface resistance
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder by incorporating carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) in specific ratios, along with adding conductive agents and electrolyte additives. This changes the electrical and chemical parameters of the binder to improve its affinity with electrolyte solution and reduce interface resistance.
Solution Approach 2:
The patent creates a composite binder system combining multiple materials: carboxymethyl cellulose, styrene-butadiene rubber, conductive agents (such as acetylene black), and electrolyte additives. This composite structure leverages the complementary properties of each component to achieve both low interface resistance and high electrolyte affinity.
2Reliability
If conventional binder is used, then the battery structure is simple, but the low-temperature discharge performance is poor
Solution Approach 1:
The patent optimizes the compositional parameters of the binder including the ratios of CMC to SBR, the amount of conductive agent, and the type and concentration of electrolyte additives. These parameter adjustments enable the binder to maintain effective ionic conductivity and mechanical adhesion at low temperatures without requiring fundamentally new materials.
Solution Approach 2:
The patent introduces electrolyte additives and conductive agents as intermediary substances that mediate between the binder and the electrolyte solution. These intermediaries facilitate ion transport across the interface and reduce resistance, thereby improving low-temperature performance without fundamentally changing the binder's primary function.
3Adaptability or versatility
If styrene-acrylic emulsion binder is used, then the manufacturing process is simple, but the polar electrolyte solution cannot penetrate into active material particles
Solution Approach 1:
The patent modifies the surface chemical parameters of the binder through the selection of specific polymers (CMC and SBR) and additives that enhance wettability and penetration capability. These parameter changes allow the polar electrolyte solution to effectively penetrate into active material particles while maintaining a relatively simple slurry preparation process.
Solution Approach 2:
The patent employs dispersants and conductive agents as intermediary substances that facilitate the penetration of electrolyte into active material particles. These intermediaries reduce interfacial tension and improve wetting, enabling effective electrolyte distribution without significantly complicating the manufacturing process.
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 new binder improves low-temperature discharge performance and lithium ion conductivity, allowing for better lithium ion conduction and alleviating resistance issues, thus enhancing the battery's performance at cold temperatures.
Implementation Method 1
the high-molecular-weight polymer is transformed into a polymer having a network structure, so that an electrolyte-resistant performance is improved
Implementation Method 2
a fourth monomer which is a substituted or unsubstituted compound having an amine group and at least two alkenyl groups... the lithium ion conductivity is improved
Implementation Method 3
The binder includes a polymer. The polymer is polymerized from a first monomer, a second monomer, a third monomer, and a fourth monomer
Data Source
AI summary
A binder includes a polymer, the polymer is polymerized from a first monomer, a second monomer, a third monomer, and a fourth monomer. The first monomer, the second monomer, and the third monomer each are independently selected from an aromatic alkenyl compound, an olefinic unsaturated carboxylic acid, an olefinic unsaturated carboxylic acid salt, or an olefinic unsaturated carboxylic acid ester. The fourth monomer is selected from a substituted or unsubstituted compound containing an amine group and at least two alkenyl groups. By adding the fourth monomer into the binder, this application improves the electrolyte-resistant performance of the binder, improves the lithium-ion conduction performance of the binder, and in turn, improves the low-temperature discharge performance of the battery.