Preparation method of battery-grade anhydrous lithium tetrafluoroborate

A lithium tetrafluoroborate, battery-grade technology, applied in the direction of boron halide compounds, etc., can solve the problem of high moisture content

Inactive Publication Date: 2011-04-27
XINJIANG RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved in the present invention is to overcome the defect of high moisture content in the prior art, and provide a method for preparing battery-grade anhydrous lithium tetrafluoroborate. Synthesis, purification with o

Method used

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  • Preparation method of battery-grade anhydrous lithium tetrafluoroborate
  • Preparation method of battery-grade anhydrous lithium tetrafluoroborate
  • Preparation method of battery-grade anhydrous lithium tetrafluoroborate

Examples

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Embodiment 1

[0022] Weigh 427.4g of hydrofluoric acid with a mass fraction of 40%, slowly add 130.0g of boric acid while stirring in a cold water bath, and complete the addition within 1 hour. Stirring was continued for 1 hour, and 78.8 g of lithium carbonate was slowly added to the above solution to adjust the pH of the solution to be neutral, and the addition was completed within 1 hour. After filtering, the filtrate was evaporated and concentrated under infrared light until the lithium tetrafluoroborate content was about 70%. After the crystals were precipitated by cooling, the crystallization liquid was separated by filtration, the mother liquor was recovered, and the crystals were dried under an infrared lamp for about 4 hours to obtain a white powder.

[0023] Put the white powder into a glove box with circulating dry air, dissolve it with a small amount of absolute ethanol, and continue to dry it under an infrared lamp for 48 hours. The ethanol is completely evaporated to dryness to...

Embodiment 2

[0026] Weigh 427.4g of hydrofluoric acid with a mass fraction of 40%, slowly add 130.0g of boric acid while stirring in a cold water bath, and complete the addition within 1 hour. Stirring was continued for 1 hour, and about 89.6 g of lithium hydroxide monohydrate was slowly added to the above solution to adjust the pH of the solution to be neutral, and the addition was completed within 1 hour. After filtering, the filtrate was evaporated and concentrated under infrared light until the lithium tetrafluoroborate content was about 70%. After filtration, the mother liquor was recovered, and the solid was dried under an infrared lamp for about 4 hours to obtain a white powder.

[0027] Dissolve the white powder in absolute ethanol, and filter again to remove impurities. The filtrate was evaporated under infrared lamp for 12 hours to obtain white lithium tetrafluoroborate powder.

[0028] Put the white powder into a glove box with circulating dry air, dissolve it with a small amo...

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Abstract

The invention discloses a preparation method of battery-grade anhydrous lithium tetrafluoroborate. The preparation method comprises the following steps of: making hydrofluoric acid and boric acid react and adding lithium carbonate or lithium hydroxide to obtain a lithium tetrafluoroborate solution; then, filtering, evaporating, concentrating, crystallizing, separating and drying; and adding absolute ethanol to dissolve in a glove box and evaporating the ethanol to obtain a lithium tetrafluoroborate product. The invention improves an aqueous solution method, synthesizes in an inorganic medium, extracts with an organic solvent, further dries to obtain an anhydrous product, overcomes the difficulties in dehydration, extraction and separation because of the inorganic medium and has low cost and convenient operation.

Description

technical field [0001] The invention relates to a preparation method of battery-grade anhydrous lithium tetrafluoroborate. Background technique [0002] Lithium-ion batteries have been widely used as portable power sources in mobile phones, notebook computers, cameras, etc. due to their advantages such as high working voltage, high energy density, small memory effect, low self-discharge rate, lightness and convenience, and will be used in high specific energy, The high-power energy storage battery market shows obvious competitive advantages. [0003] Electrolyte is an indispensable part of the electrolyte of lithium-ion batteries and one of the determinants of the performance of lithium-ion batteries. Therefore, improving the electrolyte system is an important aspect to improve the electrical performance and safety of lithium-ion batteries. [0004] Lithium tetrafluoroborate (LiBF 4 ) The electrolyte has good thermal stability and is not sensitive to environmental moistur...

Claims

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Application Information

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IPC IPC(8): C01B35/06
Inventor 马育新王蓁王克俊支红军
Owner XINJIANG RES INST OF NON FERROUS METALS
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