Two-Additive Li-Ion Electrolytes for Longer Battery Life
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Solution Overview
Problem
Existing lithium-ion battery systems require multiple electrolyte additives to achieve robust performance, which increases costs and complexity, while two-additive systems have not been effectively combined to meet the demands of grid and automobile applications.
Innovation Solution
The development of novel battery systems using two-operative electrolyte additives, such as vinylene carbonate (VC) combined with 1,3,2-dioxathiolane-2,2-dioxide (DTD), fluoro ethylene carbonate (FEC) combined with DTD, and prop-1-ene-1,3-sultone (PES) combined with DTD, along with specific positive and negative electrodes, to enhance performance and lifetime while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrolyte additives (three or four) are used to achieve robust battery performance, then reliability and lifetime are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and identifies the essential functional components from complex multi-additive systems, demonstrating that only two specific additives are necessary to achieve robust battery performance. This simplifies the electrolyte system by removing redundant additives while maintaining reliability and lifetime benefits.
Solution Approach 2:
The patent changes the concentration parameters of the two additive system to optimize performance, showing that specific concentration ranges (e.g., 0.1-5 wt% for first additive, 0.1-3 wt% for second additive) achieve the same reliability benefits as multi-additive systems without the added complexity.
2Reliability
If three or four electrolyte additives are used to improve battery performance, then reliability is improved, but manufacturing cost increases due to the expense and difficulty of including multiple additives
Solution Approach 1:
The patent extracts the essential performance-enhancing components from complex multi-additive formulations, identifying that only two specific additives are necessary to achieve robust battery performance. This reduction simplifies the manufacturing process by eliminating the need to handle, store, and precisely dose multiple expensive additives.
Solution Approach 2:
The patent employs commonly available electrolyte additives that can be easily sourced and manufactured, replacing expensive proprietary additives. This approach maintains battery performance while significantly reducing material costs and manufacturing complexity.
3Ease of manufacture
If two-additive electrolyte systems are used to reduce costs and complexity, then ease of manufacture is improved, but previously studied two-additive systems performed worse than three- and four-additive systems
Solution Approach 1:
The patent optimizes the concentration parameters of the two additives to achieve synergistic effects that match or exceed the performance of three- and four-additive systems. By carefully controlling the ratio and amounts of the two additives, the system achieves robust performance without the added complexity of additional components.
Solution Approach 2:
The patent creates a composite electrolyte system where two additives work synergistically together, producing effects that are greater than the sum of their individual contributions. This composite approach matches the performance benefits of multi-additive systems while maintaining the simplicity of a two-component formulation.
Data Source
AI summary
Improved battery systems have been developed for lithium-ion based batteries. The improved battery systems consist of two-additive mixtures in an electrolyte solvent that is a carbonate solvent, an organic solvent, a non-aqueous solvent, and/or methyl acetate. The positive electrode of the improved battery systems may be formed from lithium nickel manganese cobalt compounds, and the negative electrode of the improved battery system may be formed from natural or artificial graphite.