Nonaqueous Battery Electrolyte Coating Chemistry for Lower Formation Gas
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Solution Overview
Problem
Lithium batteries for electric automobiles and mobile devices experience excessive gas generation during initial conditioning, which is a critical defect reducing their capacity and reliability.
Innovation Solution
A nonaqueous electrolytic solution containing specific compounds represented by General Formulas (A), (α), and (β) is used, which interact with electrode materials to form a composite insulating coating film, reducing gas generation by suppressing side reactions during initial charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery capacity is increased to meet higher power demands, then the battery can provide more energy, but gas generation during initial conditioning increases significantly
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary substance that mediates between the electrode and electrolyte during initial conditioning. This compound forms a protective coating film that prevents direct harmful reactions between the electrolyte and electrode, thereby suppressing gas generation while allowing the battery to achieve high capacity
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by adding fluorinated cyclic carbonate compounds with specific molecular structures (containing F atoms and cyclic carbonate groups). This parameter change in electrolyte composition fundamentally alters the initial conditioning process, reducing gas generation while maintaining capacity enhancement
2Reliability
If conventional electrolyte additives are used to improve high-temperature cycle capacity retention, then cycle stability is improved, but gas generation during initial conditioning is not sufficiently suppressed
Solution Approach 1:
The patent employs a composite electrolyte system combining fluorinated cyclic carbonate compounds with conventional cyclic carbonate solvents and lithium salts. This composite material approach leverages the benefits of both traditional electrolyte components (for cycle stability) and the new fluorinated additive (for gas suppression), achieving dual improvement in reliability and harmful factor reduction
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 solution significantly reduces gas generation during initial conditioning of lithium batteries, enhancing their capacity and reliability by forming a protective coating on the electrodes.
Implementation Method 1
a nonaqueous electrolytic solution containing a compound represented by General Formula (A) and at least one of a compound represented by General Formula (α) and a compound represented by General Formula (β)... forming a protective coating on the electrodes
Implementation Method 2
compound represented by General Formula (A)... compound represented by General Formula (α)... compound represented by General Formula (β)... form a composite insulating coating film, reducing gas generation by suppressing side reactions during initial charging
Data Source
AI summary
A nonaqueous electrolytic solution for a nonaqueous electrolytic solution battery including a positive electrode and a negative electrode which are capable of absorbing and releasing metal ions, the nonaqueous electrolytic solution comprising an alkali metal salt, a nonaqueous solvent, a compound represented by General Formula (A), and at least one of a specific compound represented by General Formula (α) and a specific compound represented by General Formula (β).