Non-aqueous Electrolyte Additives for Lithium Battery Cycle Life
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining cycle-life characteristics and reducing resistance increase rates, particularly at room temperature, due to limitations in existing non-aqueous electrolytes.
Innovation Solution
A non-aqueous electrolyte composition for lithium secondary batteries, including a non-aqueous organic solvent, lithium salt, and specific additives represented by Chemical Formulae 1 to 6, which improve ion mobility and film stability, thereby enhancing cycle-life characteristics and reducing resistance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-aqueous electrolytes are used, then the battery can operate, but the cycle-life characteristics deteriorate and resistance increase rate increases at room temperature
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing specific additives (compounds of formulas 1-4 and formulas 5-6) with controlled amounts (0.1-10 wt% each) to improve cycle-life characteristics and reduce resistance increase rate at room temperature
Solution Approach 2:
The patent creates a composite electrolyte system by combining multiple components: non-aqueous organic solvent, lithium salt, first additive (formulas 1-4), and second additive (formulas 5-6) in specific weight ratios (first additive to second additive: 10:1 to 0.08:1), achieving synergistic effects that improve battery reliability
2Object-generated harmful factors
If conventional electrolytes are used, then the battery structure remains simple, but gas generation increases and output maintenance rate deteriorates
Solution Approach 1:
The patent modifies the electrolyte composition by adding specific compounds (formulas 1-4 and 5-6) in controlled concentrations to suppress gas generation and improve output maintenance rate during storage and operation
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 proposed electrolyte composition significantly improves room temperature cycle-life characteristics and reduces resistance increase rates, maintaining output and reducing gas generation in lithium secondary batteries.
Implementation Method 1
an organic solvent in which a lithium salt is dissolved has been used
Implementation Method 2
a first additive including at least one of compounds represented by Chemical Formulae 1 to 4; and a second additive including a compound represented by Chemical Formula 5 or 6
Data Source
AI summary
The present invention relates to a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising same. The non-aqueous electrolyte comprises: a non-aqueous organic solvent; a lithium salt; a first additive containing at least one compound among compounds represented by chemical formulas 1 to 4; and a second additive containing at least one compound among compounds represented by chemical formula 5 or 6.