Non-Aqueous Electrolyte for Thin-Collector Secondary Batteries
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Solution Overview
Problem
Current secondary batteries face challenges in achieving low cost, high energy density, high power performance, good processing performance, and high safety performance due to the limitations of thinning the aluminum foil collector, which increases internal resistance, heat production, and deteriorates the positive electrode plate's strength and processing performance.
Innovation Solution
A secondary battery design incorporating a thinned positive electrode collector with a specific non-aqueous electrolyte composition, including a compound with fluorine atoms, lithium salts, and cyclic carbonate, which controls the content and thickness of the collector and active material layer to optimize elongation, compaction density, and interface film formation, reducing internal resistance and enhancing lithium ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the aluminum foil collector is thinned to reduce cost and improve energy density, then the cost decreases and energy density increases, but the internal resistance increases and power performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the non-aqueous electrolyte by introducing a specific cyclic carboxylate compound ( Formula 1) with controlled content ratio (5-50 mass%), thereby modifying the electrolyte's chemical properties to reduce internal resistance and improve power performance while maintaining the thinned collector structure
Solution Approach 2:
The patent creates a composite electrolyte system by combining the cyclic carboxylate compound (Formula 1) with conventional electrolyte components (cyclic carbonate, chain carbonate, lithium salt), forming a multi-component composite that synergistically improves both energy density and power performance
2Quantity of substance
If the aluminum foil collector is thinned to reduce cost and improve energy density, then the cost decreases and energy density increases, but heat production increases and safety performance deteriorates
Solution Approach 1:
The patent modifies the electrolyte's thermal properties by adding the cyclic carboxylate compound (Formula 1), which changes the chemical composition parameters to reduce heat generation during battery operation, thereby improving safety performance while maintaining high energy density
3Quantity of substance
If the aluminum foil collector is thinned to improve energy density, then the energy density increases, but the processing performance deteriorates and strip breakage occurs
Solution Approach 1:
The patent changes the chemical composition of the electrolyte by introducing the cyclic carboxylate compound (Formula 1), which modifies the interfacial properties between the collector and electrolyte, thereby improving the processing performance and reducing strip breakage during manufacturing while maintaining the thinned collector structure
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 enables secondary batteries to simultaneously achieve low cost, high energy density, high power performance, good processing performance, and high safety performance by controlling the electrolyte composition and collector properties, thereby addressing the issues of internal resistance and heat production.
Implementation Method 1
the non-aqueous electrolyte comprises a compound shown in Formula 1... the positive electrode collector has an elongation at break of Q %, the positive active material layer has a compaction density of P g/cm3, and the secondary battery satisfies: A1/H is from 0.0015 to 0.20, Q+A1 is from 1 to 4 and P/A1 is from 2 to 340
Data Source
AI summary
A secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The non-aqueous electrolyte includes a compound shown in Formula 1. Based on a total mass of the non-aqueous electrolyte, the compound shown in Formula 1 is present in an amount of A1% by mass. The positive electrode collector has a thickness of H μm. The positive active material layer has an elongation at break of Q %. the positive active material layer has a compaction density of P g/cm3. The secondary battery satisfies: H is from 4 to 14, A1/H is from 0.0015 to 0.20, Q+/A1 is from 1 to 4, and P/A1 is from 2 to 340.