▎ 摘　　要

NOVELTY - Preparing piperidine ion liquid electrolyte comprises (i) obtaining 4,4-difluoropiperidine hydrochloride through alkylation and quaternization reactions and anion exchange and purification to obtain a fluoropiperidine ionic liquid with adjustable anions and cations; (ii) mixing fluoropiperidine ionic liquid with the solute lithium salt to form an ionic liquid electrolyte; and (iii) adding certain amount of additive/organic solvent to the above mixture to obtain a piperidine-based ionic liquid electrolyte. USE - The electrolyte is useful in lithium battery. ADVANTAGE - The method enables to prepare piperidine ionic liquid electrolyte, which has high capacity retention rate, and provides lithium battery with excellent flame retardance and high temperature resistance, and high voltage, which can be safely applied to large-scale power grid energy storage system. The lithium battery is easy to cause fire and explosion at high temperature, high voltage and other extreme conditions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for Use of electrolyte in lithium battery.