Lithium Battery Electrolyte Additive for Stable Electrode Interphases
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Solution Overview
Problem
Lithium secondary batteries face degradation in capacity and lifespan due to side reactions between the electrolyte and electrodes, particularly at extreme temperatures, with existing additives failing to provide sufficient performance across a wide temperature range.
Innovation Solution
An electrolyte for lithium batteries comprising a lithium salt, a non-aqueous organic solvent, and an additive represented by specific chemical formulas, which forms stable interphase films on electrodes, enhancing ion conductivity and preventing by-product generation, thereby improving discharge capacity and lifespan at low and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an organic electrolyte solution is used to achieve high voltage operation and fast charging, then energy density and charging speed are improved, but side reactions with electrodes cause degradation in capacity and lifespan
Solution Approach 1:
The patent introduces a specific additive compound (Formula 1) as an intermediary substance between the organic electrolyte and electrode. This additive preferentially reacts with electrode surfaces to form stable protective films (SEI on anode, CEI on cathode), which act as intermediaries that prevent direct contact and harmful side reactions between the electrolyte and electrodes, thereby extending battery lifespan while maintaining high energy density
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating specific additives with defined molecular structures (Formula 1 with specific R groups and ratios). By changing the chemical parameters of the electrolyte system, the stability and reactivity characteristics are optimized to reduce degradation while preserving the high voltage and energy density properties
2Reliability
If conventional additives are used to improve capacity and lifespan characteristics, then performance is enhanced at moderate temperatures, but sufficient performance cannot be maintained across a wide temperature range from below zero to high temperature
Solution Approach 1:
The patent creates a composite electrolyte system by combining the base organic electrolyte with a specifically designed additive compound (Formula 1) that has composite functional properties. This additive integrates multiple protective functions within a single molecular structure, enabling the electrolyte to maintain stable performance across diverse temperature conditions from sub-zero to high temperature environments
Solution Approach 2:
The patent applies local quality modification by having the additive concentrate at electrode-electrolyte interfaces to form localized protective films with specific properties. These interfacial films have tailored chemical and physical characteristics that are optimized for stability across wide temperature ranges, while the bulk electrolyte maintains its high conductivity and voltage properties
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 with the additive significantly improves discharge capacity and lifespan characteristics at temperatures ranging from -10°C to 45°C by forming stable interphase films, reducing interfacial resistance and enhancing lithium ion conductivity.
Implementation Method 1
an additive including a compound represented by Formula (1)... forming stable interphase films on electrodes
Implementation Method 2
enhancing ion conductivity... enhancing lithium ion conductivity
Data Source
AI summary
An electrolyte for a lithium battery and a lithium battery including the same are provided. The electrolyte for a lithium battery may include: a lithium salt; a non-aqueous organic solvent; and an additive including a compound represented by Formula 1.