Electrolyte composition and lithium battery including the same
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Solution Overview
Problem
Commercial lithium batteries lack flame retardant additives, leading to reduced cycle characteristics and unstable electrochemical properties due to side reactions at the electrode interface.
Innovation Solution
An electrolyte composition comprising a solvent, electrolyte salt, a phosphorus compound as the first additive, and a carbonate or sulfur compound as the second additive, which are included in specific weight percentages to enhance flame retardancy and electrochemical stability in lithium batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flame retardant additives are not used in commercial lithium batteries, then the battery structure remains simple and manufacturing is easier, but side reactions occur at the electrode interface leading to reduced cycle characteristics and unstable electrochemical properties
Solution Approach 1:
The patent employs a composite electrolyte system combining multiple additives (first additive from phosphor/nitrogen/sulfur/lithium compounds and second additive from carbonate/sulfur/lithium compounds) working synergistically. This composite approach provides both flame retardancy and electrochemical stability, resolving the contradiction between reliability improvement and complexity increase by selecting additives that serve multiple functions simultaneously.
Solution Approach 2:
The patent optimizes the concentration parameters of additives within specific ranges (first additive: 0.5-30 wt%, second additive: 0.5-30 wt%) to achieve the desired balance between flame retardant properties and electrochemical performance. By carefully controlling these compositional parameters, the system maintains reliability while managing complexity through quantitative optimization rather than qualitative complexity.
2Stability of the object's composition
If flame retardant additives are not used in commercial lithium batteries, then the electrolyte composition remains simple, but thermal stability is reduced and side reactions are not suppressed
Solution Approach 1:
The first and second additives act as intermediary substances between the electrolyte and electrode surfaces. These additives form protective interface layers that suppress side reactions and enhance thermal stability without requiring fundamental changes to the overall electrolyte composition. The intermediaries mediate the interaction between electrolyte components and electrodes, providing stability while maintaining composition simplicity.
3Reliability
If flame retardant additives are incorporated into the electrolyte, then flame retardant properties and electrochemical stability are improved, but the electrolyte composition becomes more complex
Solution Approach 1:
The selected additives serve multiple functions simultaneously: the first additive provides flame retardancy while the second additive enhances electrochemical stability and suppresses side reactions. This multi-functionality approach allows the electrolyte composition to achieve multiple performance improvements without proportionally increasing complexity, as each additive component performs several critical functions.
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 composition improves the flame retardant properties and electrochemical performance of lithium batteries, including charge and discharge efficiency and capacity retention, while maintaining thermal stability and reducing side reactions at high voltages.
Implementation Method 1
the first additive may include at least one among a phosphor (P) compound, a nitrogen (N) compound, a sulfur (S) compound, and a lithium (Li) compound... the electrolyte composition having improved flame retardant properties
Implementation Method 2
the second additive may include at least one among a carbonate compound, a sulfur (S) compound, and a lithium (Li) compound... stable electrochemical properties
Data Source
AI summary
An electrolyte composition of the inventive concept may include a solvent, an electrolyte salt, a first additive, and a second additive. The first additive may include at least one among a phosphor (P) compound, a nitrogen (N) compound, a sulfur (S) compound, and a lithium (Li) compound, or combinations thereof, and the second additive may include at least one among a carbonate compound, a sulfur (S) compound, and a lithium (Li) compound, or combinations thereof.