Surface-Treated Lithium Battery Anodes for Uniform Binder Distribution
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Solution Overview
Problem
The non-uniform distribution of the binder in the negative electrode active material layer of rechargeable lithium batteries leads to high ion resistance (Rion), deteriorating the rate capability and other properties of the battery.
Innovation Solution
A negative electrode design with a core material capable of intercalating and deintercalating lithium ions, coated with a surface treatment layer containing a compound represented by Chemical Formula 1, ensures uniform distribution of the binder, reducing ion resistance and improving rate capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the negative electrode is manufactured by coating a negative electrode slurry including a solvent, a negative electrode active material, and a binder on a negative electrode current collector and subsequently drying and compressing the negative electrode, then the negative electrode can be manufactured with the required structure, but the binder migrates during the drying process resulting in non-uniform distribution of the binder in the negative electrode active material layer
Solution Approach 1:
The patent changes the physical-chemical parameters of the slurry system by selecting specific solvent types (water, alcohol, or mixed solvents) and controlling their composition ratios, along with adjusting drying conditions, to prevent binder migration and achieve uniform binder distribution in the negative electrode active material layer while maintaining ease of manufacture
Solution Approach 2:
The patent aims to achieve homogeneous distribution of the binder throughout the negative electrode active material layer by optimizing the slurry composition and drying parameters, ensuring uniform properties across the entire electrode structure
2Ease of manufacture
If the binder is non-uniformly distributed in the negative electrode active material layer, then the manufacturing process is simpler, but the ion resistance increases and the rate capability deteriorates
Solution Approach 1:
The patent optimizes parameters including solvent type (water, alcohol, or mixed), solvent composition ratios, and drying conditions to achieve uniform binder distribution that reduces ion resistance and improves rate capability, while keeping the manufacturing process straightforward
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 uniform distribution of the binder in the negative electrode active material layer reduces ion resistance, enhancing the rate capability and overall performance of the rechargeable lithium battery.
Implementation Method 1
a core including a material capable of reversibly intercalating and deintercalating lithium ions
Implementation Method 2
a surface treatment layer located on a surface of the core and including a compound represented by Chemical Formula 1: wherein in Chemical Formula 1, each of R1 to R6 independently represents a hydrogen atom, a deuterium atom, a fluorine atom, or a C1 to C20 alkyl group
Data Source
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AI summary
Disclosed are a negative electrode for a rechargeable lithium battery, a method of manufacturing negative electrode, and a rechargeable lithium battery including the negative electrode. The negative electrode includes a negative electrode current collector, and a negative electrode active material layer located on the negative electrode current collector and including a negative electrode active material and a binder. The negative electrode active material includes a core including a material capable of reversibly intercalating and deintercalating lithium ions; a surface treatment layer located on a surface of the core and including a compound.