Fluorinated Ether Electrolyte for Lithium Battery Stability
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Solution Overview
Problem
Conventional organic fluorinated ether compounds used in lithium secondary batteries have limitations in performance, particularly in terms of high voltage stability and low-temperature resistance, necessitating a novel compound with improved characteristics.
Innovation Solution
An electrolyte for lithium secondary batteries incorporating an organic fluorinated ether compound with a specific structure, represented by Formula 1 (CH3—CH2—O—CF2—CHF—R1), where R1 is a C1-C10 alkyl or fluorinated alkyl group, and a lithium salt, along with an organic solvent, to enhance stability and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic fluorinated ether compounds are used as electrolyte solvents, then high oxidation voltage and flame retardancy are achieved, but low-temperature resistance and overall performance remain insufficient
Solution Approach 1:
The patent modifies the molecular structure of organic fluorinated ether compounds by changing parameters such as the type of R1 group (alkyl, cycloalkyl, fluorinated alkyl, or fluorinated cycloalkyl), the number of fluorine atoms (3-7), and the carbon chain length (C1-C10). These parameter changes optimize both high-temperature stability and low-temperature resistance simultaneously
Solution Approach 2:
The electrolyte uses a composite formulation combining the novel organic fluorinated ether compound (Formula 1) with lithium salts (such as LiPF6, LiBF4, LiClO4) and other organic solvents. This composite approach synergistically improves high oxidation voltage, flame retardancy, and low-temperature resistance beyond what single compounds can achieve
2Productivity
If existing electrolyte compositions are used, then basic battery operation is maintained, but lifetime and capacity retention are limited
Solution Approach 1:
The organic fluorinated ether compound of Formula 1 forms a stable solid electrolyte interface (SEI) film on the electrode surfaces during initial cycles. This preliminary action creates a protective layer that prevents subsequent decomposition reactions, thereby extending battery lifetime while maintaining capacity
Solution Approach 2:
By optimizing the concentration of the organic fluorinated ether compound (5-70 wt% based on total electrolyte weight) and lithium salt concentration (0.6-2.0 mol/L), the patent achieves optimal balance between battery capacity and lifetime, overcoming limitations of conventional electrolyte compositions
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 battery's lifetime, capacity, and reduces low-temperature resistance, forming a stable solid electrolyte interface and preventing decomposition, thereby enhancing overall battery performance.
Implementation Method 1
forming a stable solid electrolyte interface and preventing decomposition
Implementation Method 2
an electrolyte for a lithium secondary battery includes: a lithium salt; an organic solvent
Data Source
AI summary
An electrolyte for a lithium secondary battery, the electrolyte including: a lithium salt, an organic solvent, and an organic fluorinated ether compound represented by Formula 1:CH3—CH2—O—CF2—CHF—R1 Formula 1wherein, in Formula 1, R1 is a C1-C10 alkyl group, a C3-C10 cycloalkyl group, a C1-C10 fluorinated alkyl group, or a C3-C10 fluorinated cycloalkyl group.