CAS:135206-84-7，2,2-DIFLUOROETHYL P-TOLUENESULFONATE

The invention relates to the technical field of batteries, in particular to an electrolyte containing an anti-overcharge additive and a lithium ion battery. The electrolyte comprises a lithium salt, an organic solvent and an anti-overcharge additive, the structural formula of the anti-overcharge additive is as shown in formula 1, in the formula, R1 is fluorine-containing alkyl with 1-5 carbon atoms, and R2 is hydrogen or alkyl with 1-5 carbon atoms. By adopting the anti-overcharge additive, the property of a negative electrode interface SEI film is optimized, and the lithium ion transmission resistance is increased, so that the anti-overcharge function is realized, and the mixed lithium salt of lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate is combined, so that the stability of the electrolyte is enhanced, and the safety performance of the lithium ion battery is improved; and ethylene sulfate is adopted as an SEI film-forming protective agent to assist in forming a smooth and uniform SEI film, and meanwhile, the SEI film can be decomposed when charged at high temperature, so that the overcharge performance is optimized.

The embodiment of the present invention provides an electrolyte, a secondary battery and an electrical device, wherein in the electrolyte provided in the embodiment of the present invention, the sulfonate additive with formula (I.) structure has good film-forming stability, can effectively reduce the contact between the cathode material and the electrolyte, and reduce the oxidative decomposition of the electrolyte gas production; The anhydride additives with formula (II.) structure can preferentially react with the trace water and hydrofluoric acid in the electrolyte, inhibit the hydrolysis of sodium salt, reduce the influence of its products on the positive and negative electrode materials, thereby improving the cycling and storage performance of the battery, thus improving the electrolyte of the sodium-ion battery is easy to redox on the surface of the positive and negative electrodes to generate complex gases, resulting in the decomposition of sodium salts, affecting the cycle and storage performance of the battery.

A rapid and efficient protocol to afford the title compound 2-[ 18F]-fluoro-2,2-difluoroethyl tosylate ([18F]7b) is described. Starting from [18F]fluoride ion, labelling reagent 7b was obtained in good yields and a high specific radioactivity. Compound ([ 18F]7b) was then used to synthesise a prospective radiotracer for PET-imaging in dementia.