Lithium Battery Electrolyte Composition for Uniform Fast-Charging SEI
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving uniform power and capacity during repeated charging and discharging, as well as maintaining stability at high temperatures and during rapid charging.
Innovation Solution
An electrolyte solution for lithium secondary batteries is developed, comprising an additive with a specific compound structure, an organic solvent, and a lithium salt. This solution forms a uniform solid electrolyte interphase (SEI) with high ion conductivity, enhancing rapid charging, lifespan, and high-temperature storage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then the battery can operate, but the chemical stability is insufficient leading to poor lifespan and high-temperature storage properties
Solution Approach 1:
The patent introduces a novel additive with specific molecular structure (Formula 1) containing M+ cation and R1-R4 groups, changing the chemical composition parameters of the electrolyte solution to achieve superior chemical stability and lifespan without compromising other performance aspects
Solution Approach 2:
The electrolyte solution combines multiple components including the novel additive (Formula 1), conventional additives (VC, FEC, GBL), and standard solvents (EC, EMC, DMC) to create a composite electrolyte system that leverages the synergistic effects of different materials for enhanced stability and performance
2Productivity
If conventional electrolyte solutions are used, then the battery can charge, but rapid charging performance is insufficient
Solution Approach 1:
The novel additive (Formula 1) modifies the electrolyte's physical and chemical parameters to enable faster ion transport kinetics while maintaining stability, allowing rapid charging at high currents without compromising battery reliability or causing dendrite formation
Solution Approach 2:
The additive acts as an intermediary substance that mediates between the lithium ions and the electrode surfaces, facilitating smoother ion transport during rapid charging and reducing resistance without causing harmful side reactions
3Quantity of substance
If conventional electrolyte solutions are used, then the battery can store energy, but high-temperature storage properties deteriorate
Solution Approach 1:
The novel additive (Formula 1) with its specific molecular structure and composition parameters enhances the thermal stability of the electrolyte solution, allowing the battery to maintain energy storage capacity and chemical stability at elevated temperatures where conventional electrolytes would decompose or degrade
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 electrolyte solution significantly improves the rapid charging performance, lifespan, and high-temperature storage properties of lithium secondary batteries by forming a stable SEI with high ion conductivity.
Implementation Method 1
The electrolyte solution for a lithium secondary battery according to example embodiments may form a uniform solid electrolyte interphase (SEI) having a high ion conductivity on an electrode surface
Implementation Method 2
an electrolyte solution for a lithium secondary battery having improved chemical stability... having a structure represented by Chemical Formula 1, an organic solvent and a lithium salt
Data Source
AI summary
An electrolyte solution for a lithium secondary battery and a lithium secondary battery including the electrolyte solution are provided. The electrolyte solution includes an additive containing a compound having a specific structure, an organic solvent and a lithium salt. Accordingly, the lithium secondary battery including the electrolyte solution has improved rapid charging performance, life-span properties, and high-temperature storage properties.