Non-Aqueous Battery Electrolyte Additives for Fast-Charge Cycle Stability
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Solution Overview
Problem
Lithium secondary batteries lack sufficient quick charging performance and experience rapid performance decline with repeated quick charging, failing to meet the increasing demands for high energy density, durability, and quick charging capabilities, especially in harsh conditions.
Innovation Solution
A non-aqueous electrolyte solution for lithium secondary batteries is developed, comprising a lithium salt, organic solvent, and a specific compound represented by Formula 1 as a first additive, along with optional second additives like vinyl ethylene carbonate and fluoroethylene carbonate, optimized in concentration to enhance quick charging and output properties while reducing gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electrolyte solutions are used to enable quick charging, then charging speed is improved, but battery performance deteriorates rapidly with repeated quick charging
Solution Approach 1:
The patent introduces a novel compound with specific molecular structure (Formula 1 containing C≡C bond and heteroatom) to change the chemical parameters of the electrolyte system. This compound modifies the SEI film composition and properties, enabling fast charging rates while maintaining battery performance stability over repeated cycles, achieving both high charging speed and reliable performance retention
Solution Approach 2:
The patent creates a composite electrolyte system by combining the new compound (Formula 1) with conventional additives (Formula 2) and multiple solvents (cyclic carbonates, chain carbonates, carboxylic acid esters). This composite approach synergistically improves quick charging performance while preventing performance degradation through repeated fast charging cycles
2Productivity
If electrolyte composition is optimized for quick charging, then charging performance is improved, but gas production increases
Solution Approach 1:
The patent optimizes the concentration ratio parameters of the new compound (0.01-10 wt%, preferably 0.1-5 wt%) relative to total additives, and adjusts solvent composition ratios. These parameter optimizations enable effective gas suppression during quick charging by controlling SEI film formation and stability, preventing electrolyte decomposition that leads to gas generation while maintaining high charging rates
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 improves quick charging performance and maintains battery performance even after repeated quick charging, while also enhancing low-temperature discharge output, achieving a quick charge capacity retention rate of 85% or more and superior gas reduction effects.
Implementation Method 1
the compound having both a carbon-carbon triple bond and a heteroatom as shown in Formula 1 can contribute to forming a stable solid electrolyte interphase (SEI) film on an electrode surface
Implementation Method 2
the compound having both a carbon-carbon triple bond and a heteroatom as shown in Formula 1 can contribute to forming a stable solid electrolyte interphase (SEI) film on an electrode surface and can facilitate electron transfer due to the carbon-carbon triple bond
Implementation Method 3
the compound having both a carbon-carbon triple bond and a heteroatom as shown in Formula 1 can contribute to forming a stable solid electrolyte interphase (SEI) film on an electrode surface and can facilitate electron transfer due to the carbon-carbon triple bond, thereby having a synergistic effect in improving quick charging performance, output, and cycle stability of a battery
Data Source
AI summary
One embodiment of the present invention provides a non-aqueous electrolyte solution for a lithium secondary battery, including a lithium salt, an organic solvent and a compound represented by Formula 1 as a first additive, wherein, R1 and R2 are described herein.