FUNCTIONALIZED CHOLINE CHLORIDE IONIC LIQUID, PREPARATION METHOD THEREOF AND USE IN ELECTROCHEMICAL ENERGY STORAGE DEVICE

摘要

The present invention discloses a process for preparing a functionalized choline chloride ionic liquid as defined in formula (I), and thereof use in an electrochemical energy storage device, as an electrolyte solution or an additive for a lithium ion battery and a supercapacitor. The ionic liquid electrolyte material has better biocompatibility, flame retardance, high ionic conductivity, low viscosity, and wide electrochemical window.; wherein R¹ is selected from the group consisting of: (CH₂═CH—(CH₂)_n)—, CN(CH₂)_n—, or R²₃Si—; R² is selected from CH₃—(CH₂)_m—, n is an integer selected from 1 to 3, m is an integer selected from 0 to 2; or one of R² is (CH₃)₃Si—O—. Anion A in Formula I is selected from the group consisting of: Cl⁻, Br⁻, I⁻, BF₄⁻, NO₃⁻, SO₄²⁻, CF₃COO⁻, CF₃SO₃⁻, (CF₃SO₂)₂N⁻, PF₆⁻, BF₂C₂O₄⁻, or B(C₂O₄)₂⁻.