Fluorinated Ether Electrolyte for Lithium Battery High Voltage 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 the development of a novel compound with improved characteristics.
Innovation Solution
An electrolyte for lithium secondary batteries incorporating an organic fluorinated ether compound with a specific structure (R1—O—CF2—CHF—R2), where R1 is a C3-C10 alkyl or cycloalkyl group and R2 is fluorine or a C1-C10 alkyl/cycloalkyl group, along with a lithium salt and organic solvent, to enhance stability and capacity.
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 parameters of conventional fluorinated ether compounds by introducing specific substituents (R1 and R2 groups) at defined positions in the molecular formula R1-O-CF2-CHF-R2. This structural parameter change enables the compound to maintain high oxidation voltage while simultaneously improving low-temperature resistance, thus resolving the technical contradiction between high voltage stability and low-temperature adaptability
Solution Approach 2:
The patent creates a composite electrolyte system by combining the novel fluorinated ether compound (Formula 1) with conventional electrolyte components including lithium salts and other organic solvents. This composite approach allows the battery to benefit from both the high oxidation voltage and flame retardancy of fluorinated ethers and the improved low-temperature performance of the new compound structure
2Object-affected harmful factors
If conventional organic fluorinated ether compounds are used, then flame retardancy is improved, but lifetime and capacity performance are limited
Solution Approach 1:
The patent changes the chemical structure parameters of fluorinated ether compounds by defining specific substituents R1 (C1-C10 alkyl or C3-C10 cycloalkyl) and R2 (fluorine, C1-C10 alkyl, C3-C10 cycloalkyl, or their fluorinated variants) at positions in the molecular formula R1-O-CF2-CHF-R2. These parameter changes enhance both flame retardancy and battery lifetime by improving the compound's stability and its ability to form protective interfaces
3Stability of the object's composition
If conventional organic fluorinated ether compounds are used, then high voltage stability is achieved, but decomposition occurs at high voltages
Solution Approach 1:
The patent modifies the molecular parameters of fluorinated ether compounds by introducing specific R1 and R2 substituent groups in the formula R1-O-CF2-CHF-R2. These parameter changes enhance the compound's electrochemical stability window and reduce decomposition at high voltages while maintaining high voltage stability, thereby resolving the contradiction between voltage stability and decomposition resistance
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 improves the battery's lifetime, capacity, and reduces low-temperature resistance, achieving better performance compared to conventional compounds by forming a stable solid electrolyte interface and suppressing decomposition at high voltages.
Implementation Method 1
forming a stable solid electrolyte interface
Implementation Method 2
suppressing decomposition at high voltages
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:R1—O—CF2—CHF—R2 Formula 1wherein, in Formula 1, R1 is a C3-C10 alkyl group or a C3-C10 cycloalkyl group, and R2 is fluorine, a C1-C10 alkyl group, a C3-C10 cycloalkyl group, a C1-C10 fluorinated alkyl group, or a C3-C10 fluorinated cycloalkyl group.