Lithium Battery Electrolyte Stabilizing PF5
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Solution Overview
Problem
Lithium batteries face instability and reduced performance due to the chemical instability of lithium hexafluorophosphate (LiPF6) when exposed to moisture or acidic impurities, leading to the generation of HF, which corrodes the solid electrolyte interface and decreases battery lifetime.
Innovation Solution
An electrolyte comprising a compound represented by Formula 1, a nonaqueous organic solvent, and a lithium salt is used to suppress the generation of HF and stabilize PF5, forming a stable solid electrolyte interface on the anode surface, thereby improving battery stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flame-resistant electrolyte is used to improve safety, then stability is improved, but power output and lifetime are reduced
Solution Approach 1:
The patent modifies the chemical structure of the flame-resistant electrolyte by introducing specific functional groups and molecular configurations that alter its electrochemical properties. This allows the electrolyte to maintain flame resistance while improving ionic conductivity and reducing internal resistance, thereby restoring power output and lifetime performance.
Solution Approach 2:
The patent creates a composite electrolyte system combining flame-resistant components with high-conductivity additives and stabilizing agents. This composite structure enables the electrolyte to simultaneously achieve safety (flame resistance) and performance (power output and lifetime) by leveraging the complementary properties of different materials.
2Reliability
If flame-resistant electrolyte is used to improve safety, then stability is improved, but lifetime is reduced
Solution Approach 1:
The patent introduces intermediary substances that act as protective mediators between the flame-resistant electrolyte and the battery components. These intermediaries prevent harmful chemical reactions and degradation processes, allowing the electrolyte to maintain its safety properties while protecting the battery from damage that would reduce lifetime.
Solution Approach 2:
The patent adjusts key parameters of the flame-resistant electrolyte including viscosity, ionic conductivity, and decomposition temperature through molecular structure modification. These parameter changes enable the electrolyte to maintain stability and safety while improving compatibility with battery components, thereby extending battery lifetime.
3Power
If LiPF6 is used as lithium salt, then conductivity is improved, but chemical stability deteriorates when exposed to moisture
Solution Approach 1:
The patent introduces moisture-scavenging intermediaries and protective additives that form protective layers around the LiPF6 molecules. These intermediaries prevent direct contact between LiPF6 and moisture, maintaining the high conductivity of LiPF6 while protecting it from hydrolysis and chemical degradation.
Solution Approach 2:
The patent creates an inert chemical environment within the electrolyte system using moisture barriers and stabilizing additives that prevent water from interacting with LiPF6. This inert environment allows LiPF6 to maintain its superior conductivity properties without suffering from moisture-induced chemical instability.
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 enhances the lifetime and high-rate characteristics of lithium batteries by preventing SEI damage and maintaining discharge voltage retention, while reducing resistance and improving capacity retention rates.
Implementation Method 1
An electrolyte comprising a compound represented by Formula 1, a nonaqueous organic solvent, and a lithium salt is used to suppress the generation of HF and stabilize PF5, forming a stable solid electrolyte interface on the anode surface
Implementation Method 2
forming a stable solid electrolyte interface on the anode surface
Data Source
AI summary
An electrolyte for a lithium battery, the electrolyte including a compound represented by Formula 1; a nonaqueous organic solvent; and a lithium salt.wherein, in Formula 1, X, Ya, Z, R1, and R2 are as defined.