Non-aqueous Electrolyte Additives for Battery Resistance Reduction
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Solution Overview
Problem
There is a need to further improve the resistance characteristics of lithium secondary batteries, specifically reducing initial and post-storage battery resistance to enhance their performance and storage life.
Innovation Solution
A non-aqueous electrolyte solution is developed that includes a cyclic sulfate compound and an aromatic or carbamate compound as additives, which form a passivation film on the negative electrode surface, reducing solvent decomposition and increasing battery resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional additives (cyclic sulfate alone) are used in the non-aqueous electrolyte solution, then some resistance improvement is achieved, but initial and post-storage battery resistance remains insufficiently reduced
Solution Approach 1:
The patent combines cyclic sulfate (additive A) with at least one compound from the group consisting of aromatic compounds having halogen atoms or alkyl groups and carbamate compounds (additive B) to create a synergistic effect that reduces both initial and post-storage battery resistance more effectively than either additive alone
Solution Approach 2:
The patent uses a composite additive system where cyclic sulfate and aromatic/carbamate compounds work together to form a composite passivation film on the negative electrode surface, combining the protective properties of different chemical compounds to achieve superior resistance characteristics
2Reliability
If battery resistance is reduced through additive incorporation, then resistance characteristics improve, but battery performance under normal operating conditions may be affected
Solution Approach 1:
The patent applies additives selectively to modify the local properties at the negative electrode surface where passivation film formation occurs, while maintaining the bulk electrolyte composition and properties suitable for normal battery operation
Solution Approach 2:
The patent optimizes the concentration ranges of additives A and B (0.001-10 mass% and 0.001-20 mass% respectively) to achieve the desired resistance characteristics while maintaining normal operating performance, demonstrating parameter optimization to balance competing requirements
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 significantly reduces initial and post-storage battery resistance, improving the battery's resistance characteristics and extending its service life without degrading its performance under normal operating conditions.
Implementation Method 1
adding a specific compound to a non-aqueous electrolyte solution for a battery can significantly improve battery resistance characteristics
Implementation Method 2
form a passivation film on the negative electrode surface, reducing solvent decomposition
Implementation Method 3
reducing solvent decomposition and increasing battery resistance
Data Source
Figure 1
AI summary
Anon-aqueous electrolyte solution for a battery includes: an additive A which is a compound represented by formula (I); and an additive B which is at least one selected from the group consisting of an aromatic compound having at least one of a halogen atom or an alkyl group and a carbamate, and which is a compound other than carbonates or a cyclic sulfates. In formula (I), R1 represents a group represented by formula (II) or a group represented by formula (III) and R2 represents H, a C1-6 alkyl group, a group represented by formula (II), or a group represented by formula (III); or R1 and R2 represent groups which combine to form a benzene ring or cyclohexyl ring. In formula (II), R3 represents a halogen atom, a C1-6 alkyl group, a C1-6 alkyl halide group, a C1-6 alkoxy group, or a group represented by formula (IV).