Nonaqueous Electrolyte Additives for Lower Initial Battery Resistance

The patent modifies the chemical structure of the five-membered ring compound by introducing specific substituents (fluorine atoms at different positions, various alkyl groups, alkoxy groups, etc.) to change the parameters of the additive molecule. This structural modification allows the compound to maintain its film-forming capability for improving cycle characteristics while reducing its harmful effect of increasing initial resistance. The systematic variation of molecular parameters (formula (1) with different R1, R2, R3, R4 groups and formula (2) with different Y, Y', Z, Z' combinations) enables optimization of both beneficial and adverse properties.

The patent employs parameter changes by systematically modifying the molecular structure of the five-membered ring compound through various substituent groups (fluorine atoms, alkyl groups, alkoxy groups, etc.) as shown in formulas (1) and (2). These structural parameter modifications enable the compound to maintain its durability-improving function while minimizing its negative impact on initial output characteristics, thus resolving the contradiction between long-term reliability and initial power performance.

The patent applies parameter changes by modifying the molecular parameters of the five-membered ring compound through systematic substitution patterns (different positions of fluorine atoms, various alkyl and alkoxy groups at R1-R4 positions in formula (1), and different heteroatom combinations in formula (2)). These parameter modifications enable the additive to maintain its protective function for improving storage characteristics while reducing its harmful effect of increasing internal resistance, achieving a better balance between the two properties.