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Method for preparing lithium hexafluoroantimonate by alkaline direct oxidization

A technology of lithium hexafluoroantimonate and lithium hydroxide, which is applied in chemical instruments and methods, inorganic chemistry, antimony compounds, etc., can solve the problems of strong corrosion, harsh conditions, and high preparation costs, and achieve low production costs and eliminate waste water Good effect on emission and product quality

Inactive Publication Date: 2018-08-10
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 alkaline direct oxidization
  • Method for preparing lithium hexafluoroantimonate by alkaline direct oxidization
  • Method for preparing lithium hexafluoroantimonate by alkaline direct oxidization

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Embodiment 1

[0035] Sb in the antimony white of the present invention 2 o 3 The mass percentage content is greater than 99.90%, analytical pure lithium hydroxide (LiOH ≥ 99%), analytical pure hydrofluoric acid (HF ≥ 40%), analytical pure hydrogen peroxide (H 2 o 2 ≥30%), the purity of hydrogen sulfide gas is greater than 99.0%.

[0036] Prepare a lithium hydroxide solution with a concentration of 2.0mol / L, add antimony white according to the liquid-solid ratio of solution volume L to antimony white mass kg 4 / 1, raise the temperature to 80°C, and then use a constant flow pump at a flow rate of 0.15L / Min add hydrogen peroxide, control the amount of hydrogen peroxide to be 1.3 times of the theoretical amount, continue to stir and react for 1.0h after the hydrogen peroxide is completely added, and then use vacuum filtration to achieve liquid-solid separation; the precipitate is added to a lithium hydroxide solution with a concentration of 10g / L In medium washing, the liquid-solid ratio of ...

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Abstract

The invention provides a method for preparing lithium hexafluoroantimonate by alkaline direct oxidization. The method comprises the following steps: slurrying antimony white in a lithium hydroxide aqueous solution; then adding hydrogen peroxide and oxidizing to precipitate antimony in the form of lithium thioantimonite; washing sediment to produce a lithium thioantimonite precursor; after slurrying lithium thioantimonite with water, adding hydrofluoric acid and neutralizing to a required pH (Potential of Hydrogen) numerical value; then adding hydrogen peroxide into a solution to oxidize less residual trivalent antimony in lithium thioantimonite into pentavalent antimony; after carrying out liquid-solid separation on slurry by adopting a vacuum filtering manner, introducing hydrogen sulfidegas into a lithium hexafluoroantimonate solution and purifying and removing heavy metal impurities; concentrating, crystallizing and drying the purified solution to obtain a lithium hexafluoroantimonate product. The method provided by the invention has the essence that the lithium thioantimonite precursor is prepared through direct oxidization by utilizing a principle that the solubility of lithium thioantimonite is small; then the lithium hexafluoroantimonate product is generated by utilizing a principle that the bond length of Sb-F is shorter than that of Sb-OH and the binding force is strong. The method provided by the invention has the advantages of short technological flow, good product quality and low cost.

Description

technical field [0001] The invention relates to a preparation method of lithium hexafluoroantimonate, in particular to a method for preparing lithium hexafluoroantimonate by direct oxidation of antimony white in an alkaline 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G30/00H01M4/58H01M10/0525
CPCC01G30/003C01P2002/72C01P2004/03C01P2006/80H01M4/582H01M10/0525Y02E60/10
Inventor 刘伟锋杨天足张杜超陈霖唐攒浪刘好男
Owner CENT SOUTH UNIV
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