Non-Aqueous Electrolyte for Thin Copper-Foil Secondary Batteries
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Solution Overview
Problem
Current secondary batteries face challenges in achieving low cost, high energy density, high power performance, and high safety performance simultaneously due to increased internal resistance and heat production when the copper foil collector is thinned, leading to poor power performance and safety hazards.
Innovation Solution
A secondary battery design incorporating a non-aqueous electrolyte with a specific compound, where the compound is present in a controlled amount relative to the thickness and compaction density of the electrode collectors, forming low-impedance interface films to reduce internal resistance and enhance lithium ion transport, while also improving the strength and processability of the electrode collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the copper 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 applies parameter changes by optimizing the thickness of the copper foil collector within a specific range (3-7 μm) and controlling the content of the oxalate compound in the non-aqueous electrolyte (A1/H1 ratio between 0.003-0.40). This systematic parameter optimization allows the thin collector to achieve both low cost and acceptable power performance by balancing thickness with electrolyte composition.
Solution Approach 2:
The patent introduces an oxalate compound as an intermediary substance in the non-aqueous electrolyte. This compound acts as a mediator that forms protective interface films on the electrode surfaces, compensating for the deficiencies caused by the thinned copper foil collector. The intermediary substance enables the thin collector to achieve low internal resistance and good power performance despite its reduced thickness.
2Quantity of substance
If the copper 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 oxalate compound in the non-aqueous electrolyte serves as a safety intermediary by forming stable interface films on the electrode surfaces. These films prevent direct contact between the electrolyte and electrode materials, reducing unwanted side reactions and heat generation. This intermediary layer ensures that even with a thinned copper foil collector, the battery maintains good safety performance.
Solution Approach 2:
The patent controls the A1/H1 ratio (oxalate compound content to collector thickness) within 0.003-0.40 to optimize the balance between energy density and safety. By precisely controlling this parameter ratio, the thin collector achieves high energy density while the electrolyte composition compensates to maintain safety by preventing excessive heat production.
3Power
If the non-aqueous electrolyte contains the oxalate compound at controlled amounts, then internal resistance decreases and power performance improves, but the device complexity increases
Solution Approach 1:
The patent simplifies the complexity issue by defining a clear parameter control rule: the A1/H1 ratio should be between 0.003-0.40. This single parameter control approach makes the electrolyte composition manageable despite the added oxalate compound. The systematic parameter specification transforms a potentially complex formulation into a controllable manufacturing parameter.
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 achieve low cost, high energy density, high power performance, and high safety performance by optimizing the content and structure of the non-aqueous electrolyte and electrode materials, thereby reducing internal resistance and heat production.
Implementation Method 1
forming low-impedance interface films to reduce internal resistance and enhance lithium ion transport
Data Source
AI summary
A secondary battery, a battery module, a battery pack and an electrical device containing the same are described. The secondary battery comprises a positive electrode plate, a negative electrode plate, and a non-aqueous electrolyte, wherein the non-aqueous electrolyte comprises a compound shown in Formula 1, based on the total mass of the non-aqueous electrolyte, the compound shown in Formula 1 is present in an amount of A1% by mass; the negative electrode collector has a thickness of H1 μm, the negative active material layer has a compaction density of P1 g/cm3, and the secondary battery satisfies: H1 is from 3 to 7, A1/H1 is from 0.003 to 0.40 and P1/A1 is from 1 to 90. The secondary battery with a thinned negative electrode collector has low cost, high energy density, high power performance and high safety performance at the same time.