Electronic Chemicals

The electrolytes of chemical power supply include aqueous electrolyte and non-aqueous electrolyte. In addition to the factors of electrode material, the advantages and disadvantages of lithium-ion battery are closely related to the properties of electrolyte. Due to the good temperature stability of electrolyte and wide electrochemical window, the working voltage of lithium-ion battery (usually about 4V) is more than twice that of battery using aqueous electrolyte (generally no more than 2V), Therefore, lithium-ion batteries have the properties of high voltage and high specific energy. At the same time, lithium-ion batteries also have the important deficiency of dry non-aqueous electrolyte. The conductivity of nonaqueous electrolyte is less than one tenth of that of aqueous electrolyte, which limits the high rate charge discharge performance of lithium-ion battery; The high technical content and price of electrolyte lead to the high cost of lithium-ion battery; The high tenderness of organic liquid electrolyte has become an insurmountable safety hazard of liquid lithium-ion battery. Therefore, in order to overcome its shortcomings on the basis of ensuring the advantages of lithium-ion battery, the electrolyte system of lithium-ion battery must have some special properties.

Chromium trioxide (chemical formula: CrO3), usually dark red, orthorhombic crystal, soluble in water, alcohol, sulfuric acid and ether, but insoluble in acetone (acetone will explode violently when encountering chromium trioxide, which is dangerous!), Deliquescent easily. Dissolve in water to form chromic acid. It has strong oxidizability. Chromium trioxide, sulfuric acid and acetone are used to oxidize alcohols to carboxylic acids or ketones (Jones oxidation reaction). Chromium trioxide can be precipitated by the reaction of sodium dichromate and concentrated sulfuric acid, so it has long been called chromic acid. It decomposes above 197 ° C and gradually loses oxygen. The intermediate product is black chromium dioxide and the final product is chromium trioxide. It can form adducts with many organic compounds (such as pyridine) with the general formula CrO3 · 2L.

2-bromo-1,10-phenanthroline is used in organic synthesis.

Benzo [1,2-b: 4,5-b] dithiophene-4,8-dione is used as a synthetic material intermediate and pharmaceutical intermediate. It can be used in laboratory research and development process and chemical and pharmaceutical synthesis process.