Lithium Battery Electrolyte Additive for Stable SEI and Li Salt Solubility

The patent changes the molecular weight parameter from low-molecular to high-molecular compounds, which prevents vaporization during synthesis while maintaining ease of manufacture. This parameter change resolves the contradiction by eliminating the vaporization issue that causes yield loss.

The patent uses composite structures with specific functional groups (boron or phosphorus-containing groups combined with other electroactive groups) to create compounds that maintain synthetic feasibility while preventing vaporization. The composite nature of these compounds provides both ease of manufacture and high synthesis yield.

The patent changes the chemical composition parameters by introducing specific boron or phosphorus-containing functional groups with defined molecular structures. These parameter changes enhance oxidation stability while maintaining manufacturing ease through well-established synthesis routes for these functional groups.

The patent employs readily available starting materials and conventional synthesis methods for creating the high-molecular compounds, making the manufacturing process economically viable and technically straightforward despite the enhanced molecular complexity required for oxidation stability.

The patent changes the molecular weight and structural parameters of the electrolyte additives, creating high-molecular compounds that form more stable protective films on electrodes. This maintains low internal resistance for high capacity while improving safety through enhanced thermal and chemical stability of the compound structure.

The high-molecular boron or phosphorus-containing compounds act as intermediary substances that form stable interfacial films between electrodes and electrolyte. These films mediate the interaction, allowing efficient ion transport (maintaining capacity) while preventing harmful reactions (improving safety).