Electrolyte Composition for Fast-Charging and High-Temperature Cycling
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Solution Overview
Problem
Current electrochemical apparatuses face challenges in achieving excellent fast charging performance and high-temperature interval cycle performance, as they tend to degrade due to heat generation and lithium precipitation, leading to reduced battery capacity and safety issues.
Innovation Solution
The formulation of an electrolyte composition that includes a carboxylate compound and fluoroethylene carbonate, with specific percentage ratios and the addition of a nitrile compound, which stabilizes the electrode structures and improves ion transmission rates, while also forming protective films to prevent gas generation and lithium precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast charging is implemented with high current density, then charging speed is improved, but heat generation increases and cycling stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing a carboxylate compound with specific molecular structure (formula I) and controlling its weight percentage (5-60%), along with FEC content (2-12%). This parameter optimization enables the electrolyte to maintain stable performance at high current densities while reducing heat generation, thus improving both charging speed and cycling stability simultaneously
Solution Approach 2:
The patent creates a composite electrolyte system by combining the carboxylate compound (with specific R11 and R12 groups) and fluoroethylene carbonate (FEC) in defined ratios. This composite formulation synergistically improves fast charging performance and high-temperature interval cycle performance, resolving the contradiction between charging speed and cycling stability
2Productivity
If high-temperature storage and charge-discharge cycles occur, then battery capacity degrades, but operational requirements remain
Solution Approach 1:
The patent optimizes the weight percentage of the carboxylate compound (5-60%) and FEC (2-12%) in the electrolyte formulation. This parameter control enables the electrolyte to maintain stable electrochemical performance during high-temperature interval cycles, preventing capacity degradation while meeting operational requirements
Solution Approach 2:
The carboxylate compound acts as a sacrificial additive that forms protective films on electrode surfaces during initial cycles. These films prevent further degradation reactions, allowing the battery to maintain capacity during high-temperature storage and cycling operations
3Productivity
If electrolyte composition is optimized for fast charging, then charging performance improves, but high-temperature stability may worsen
Solution Approach 1:
The patent formulates a composite electrolyte containing both carboxylate compound and FEC in specific proportions (2≤w1/w2≤20). This composite structure enables the electrolyte to simultaneously achieve fast charging performance through improved ion conductivity and high-temperature stability through enhanced thermal resistance of the protective films
Solution Approach 2:
The carboxylate compound with specific R11 and R12 groups provides localized protection at the electrode-electrolyte interface, forming stable protective films that prevent degradation reactions. This local action at the interface enables fast charging bulk performance while maintaining high-temperature stability at the critical reaction sites
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
This approach enhances both fast charging and high-temperature interval cycle performance of electrochemical apparatuses, maintaining battery capacity and safety by optimizing the electrolyte composition and electrode design.
Implementation Method 1
forming protective films to prevent gas generation and lithium precipitation
Implementation Method 2
improves ion transmission rates
Implementation Method 3
stabilizes the electrode structures
Data Source
AI summary
An electrochemical apparatus includes an electrolyte, where the electrolyte includes a carboxylate compound and fluoroethylene carbonate (FEC). Based on a total weight of the electrolyte, percentages of the carboxylate compound and FEC are w1 and w2 respectively, where 5%≤w1≤60%, 2%≤w2≤12%, and 2≤w1/w2≤20. The electrochemical apparatus delivers excellent fast charging performance and high-temperature interval cycle performance.