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Method for preparing lithium hexafluoroantimonate by potassium hydroxide system

A technology of lithium hexafluoroantimonate and potassium hydroxide, applied in chemical instruments and methods, inorganic chemistry, antimony compounds, etc., can solve the problems of harsh conditions, strong corrosiveness, high preparation cost, and achieve low production cost and product quality. Good, the effect of eliminating waste water discharge

Inactive Publication Date: 2018-08-14
CENT SOUTH UNIV
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Problems solved by technology

This method uses anhydrous hydrofluoric acid as the reaction medium, which is highly corrosive and harsh, and the preparation cost is high

Method used

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  • Method for preparing lithium hexafluoroantimonate by potassium hydroxide system
  • Method for preparing lithium hexafluoroantimonate by potassium hydroxide system
  • Method for preparing lithium hexafluoroantimonate by potassium hydroxide system

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Embodiment 1

[0038] Sb in the antimony white of the present invention 2 o 3 The mass percentage content is greater than 99.90%, analytically pure potassium hydroxide (KOH≥99%), analytically pure lithium hydroxide (LiOH≥99%), analytically pure hydrofluoric acid (HF≥40%), analytically pure hydrogen peroxide (H 2 o 2 ≥30%), the purity of oxygen and hydrogen sulfide gas is greater than 99.0%.

[0039] Prepare a potassium hydroxide solution with a concentration of 3.0 mol / L, add antimony white according to the liquid-solid ratio of solution volume L to antimony white mass kg 2.5 / 1, add the slurry to the autoclave after stirring, then heat and raise the temperature to 125°C, control the partial pressure of oxygen to 0.4MPa and react for 0.9h. After the reaction is completed, cool down and lower the temperature to 75°C. Use vacuum filtration to achieve liquid-solid separation. Raise the temperature of potassium pyroantimonate to 80°C and keep fully stirring. Add lithium hydroxide solution wit...

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Abstract

The invention provides a method for preparing lithium hexafluoroantimonate by a potassium hydroxide system. The method comprises the following steps of performing pressurized oxidization dissolution on antimony white by introducing oxygen into a potassium hydroxide high-temperature water solution; then, adding lithium hydrate into a potassium pyroantimonate solution to take metathesis precipitation reaction; pulping produced lithium antimonate precursors by water; then, after hydrofluoric acid is added for neutralization to reach the pH value, adding hydrogen peroxide into the solution, so that a small amount of trivalent antimony in the lithium antimonate solution is oxidized into pentavalent antimony; performing concentration, crystallization and drying on purified liquid to obtain a lithium hexafluoroantimonate product. The method is characterized in that the potassium pyroantimonate solution is obtained by using the principle that the dissolution degree of the potassium pyroantimonate is highest; then, lithium antimonate precursors are prepared by using the principle that the dissolution degree of the lithium antimonate is low; finally, the lithium hexafluoroantimonate productis obtained by using the principle that the Sb-F bond length is shorter than the Sb-OH bond length, and the bonding force is strong. The method has the advantages that the technical process is short;the product quality is high; the cost is low.

Description

technical field [0001] The invention relates to a method for preparing lithium hexafluoroantimonate, in particular to a method for preparing lithium hexafluoroantimonate in a potassium hydroxide system. Background technique [0002] As an advanced new energy device, lithium-ion battery has the advantages of high energy density, high output voltage, large output power, small self-discharge, no memory effect, wide operating temperature range and fast charge and discharge, so it is widely used in Electronic products, vehicles, national defense and aerospace, etc. Among the main components of lithium-ion batteries, the research on electrolyte lithium salts is of great significance to promote the development of lithium batteries (Liu Xu et al. Research progress on lithium-ion battery electrolyte lithium salts. Power Technology, 2016,40(01):218- 220.). [0003] At present, the electrolyte lithium salts mainly used in lithium-ion batteries are divided into organic lithium salts a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G30/00
Inventor 刘伟锋杨天足陈霖张杜超唐攒浪张坤坤
Owner CENT SOUTH UNIV
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