Two-Additive Electrolyte for Fast-Charging NMC-Graphite Batteries
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Solution Overview
Problem
Existing rechargeable lithium-ion battery systems require more than two additives to achieve robust performance, which increases cost and complexity, while the synergistic interactions between additives and electrodes are not well understood, leading to suboptimal performance in applications requiring fast charging and discharging.
Innovation Solution
A two-additive electrolyte system comprising vinylene carbonate (VC) combined with 1,2,6-oxodithiane-2,2,6,6-tetraoxide (ODTO), or fluoroethylene carbonate (FEC) combined with ODTO, paired with lithium nickel manganese cobalt oxide (NMC) positive electrodes and graphite negative electrodes, enhances battery performance and reduces costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three or four electrolyte additives are used to achieve robust battery performance, then battery reliability and lifetime are improved, but manufacturing cost and system complexity increase
Solution Approach 1:
The patent extracts and eliminates unnecessary electrolyte additives from the system. By identifying that only two specific additives (VC and ODTO, or FEC and ODTO) are needed for robust performance, the invention removes excess additives (reducing from 3-4 to 2), thereby simplifying the electrolyte system while maintaining reliability and extending battery lifetime.
Solution Approach 2:
The patent optimizes the concentration parameters of the two electrolyte additives to achieve robust performance. By precisely controlling the amounts of VC/FEC and ODTO, the system attains optimal battery lifetime and reliability without requiring additional additives, thus reducing complexity while maintaining high performance.
2Duration of action of stationary object
If three or four electrolyte additives are used to improve battery performance, then battery lifetime is extended, but manufacturing cost increases
Solution Approach 1:
The patent removes unnecessary electrolyte additives from the formulation, reducing the number of components from 3-4 to just 2 (VC/FEC combined with ODTO). This extraction of excess additives directly lowers manufacturing costs while preserving the battery lifetime extension benefit through the optimized two-additive system.
Solution Approach 2:
The patent employs commonly available, cost-effective electrolyte additives (VC or FEC combined with ODTO) in optimized concentrations to achieve robust long-term performance. This approach replaces expensive proprietary additives with more economical alternatives that deliver comparable or superior battery lifetime at lower cost.
3Productivity
If conventional electrolyte systems are used, then manufacturing simplicity is maintained, but performance in fast charging and discharging applications is suboptimal
Solution Approach 1:
The patent modifies the electrolyte composition parameters by implementing a specific two-additive system (VC or FEC with ODTO) at optimized concentrations. This parameter optimization enables the battery to achieve both high charging/discharging rates and robust long-term reliability, resolving the trade-off between productivity and reliability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining two specific additives (VC/FEC with ODTO) that work synergistically. This composite approach enhances both fast charging capability and system robustness, achieving superior performance in demanding applications compared to conventional single-additive or multi-additive systems.
4Device complexity
If two electrolyte additives are used to reduce cost and simplify the system, then manufacturing cost and complexity are reduced, but battery performance and lifetime may be compromised
Solution Approach 1:
The patent optimizes the concentration parameters of the two electrolyte additives (VC/FEC and ODTO) to achieve robust battery performance. By precisely controlling the additive amounts, the system maintains high reliability and extended lifetime while keeping the electrolyte formulation simple with only two components.
Solution Approach 2:
The patent uses ODTO as a key intermediary additive that works synergistically with VC or FEC to enhance battery performance. This intermediary compound mediates between the simple two-additive formulation and the requirement for robust long-term performance, enabling the system to achieve high reliability without compromising on simplicity.
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 two-additive system improves battery lifetime and performance in energy storage applications, maintaining 95% capacity retention after multiple cycles and reducing cell impedance, thus supporting fast charging and discharging requirements.
Implementation Method 1
Electrolyte additives have been shown to be operative and increase the lifetime and performance of Li-ion-based batteries
Implementation Method 2
rechargeable lithium-ion battery systems
Implementation Method 3
the synergistic interactions between additives and electrodes are not well understood, leading to suboptimal performance
Data Source
AI summary
Improved battery systems with two-additive mixtures including in an electrolyte solvent that is a carbonate solvent, an organic solvent, a non-aqueous solvent, methyl acetate, or a combination of them. 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.