Lithium hexafluorophosphate, crystal and preparation method thereof, lithium ion battery electrolyte and lithium ion battery

A technology for lithium hexafluorophosphate and lithium-ion batteries, which is applied in the fields of lithium hexafluorophosphate and its crystallization and preparation, lithium-ion batteries, and electrolytes for lithium-ion batteries. The effect of rate and quality

Pending Publication Date: 2021-02-09
HUIZHOU BYD BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the purity of lithium hexafluorophosphate needs to be improved in the p...

Method used

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  • Lithium hexafluorophosphate, crystal and preparation method thereof, lithium ion battery electrolyte and lithium ion battery
  • Lithium hexafluorophosphate, crystal and preparation method thereof, lithium ion battery electrolyte and lithium ion battery
  • Lithium hexafluorophosphate, crystal and preparation method thereof, lithium ion battery electrolyte and lithium ion battery

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preparation example Construction

[0057] The second aspect of the present invention provides a preparation method of lithium hexafluorophosphate, comprising:

[0058] (a-1) Lithium fluoride is dissolved in anhydrous hydrogen fluoride to form a reaction solution; at the same time, anhydrous hydrogen fluoride is contacted with phosphorus pentachloride to react to generate PF containing 5 gas;

[0059] The PF containing 5 After the gas is condensed to remove HF, it is synthesized with the reaction solution;

[0060] or

[0061] (a-2) suspending lithium fluoride in an aprotic solvent to form a reaction suspension, wherein the aprotic solvent is selected from C 2 -C 7 Alkyl ethers, C 2 -C 7 Nitrile or C 2 -C 7 Carbonate;

[0062] Under pressurized conditions, the PF 5 the gas reacts with the reaction suspension;

[0063] (b) Using the synthetic product obtained in step (a-1) or the reaction product obtained in step (a-2) as a mother liquor containing lithium hexafluorophosphate to crystallize lithium hex...

Embodiment 1

[0084] (1) Dissolve 50g of lithium fluoride in 230g of anhydrous hydrogen fluoride to form a reaction solution; slowly react anhydrous hydrogen fluoride with phosphorus pentachloride to generate PF 5 gas;

[0085] will PF 5 After the gas is condensed to remove HF, it is introduced into the reaction solution to carry out the synthesis reaction. The reaction temperature is 10°C, the reaction pressure is 0.1MPa, and the mother liquor containing lithium hexafluorophosphate is obtained from the reaction;

[0086] (2) Add the mother liquor (10°C) containing lithium hexafluorophosphate dropwise into the crystallization tank with stirring, the dropping rate is 10L / h, and the first stirring rate is 50rpm;

[0087](3) After adding all the mother liquor containing lithium hexafluorophosphate into the crystallization tank, turn on the ultrasonic generator, so that the mother liquor containing lithium hexafluorophosphate is placed in an ultrasonic environment to start cooling and crystall...

Embodiment 2

[0091] (1) 50g of lithium fluoride is fully suspended in 1000g of diethyl carbonate under sealed stirring conditions to obtain a reaction suspension; slowly react anhydrous hydrogen fluoride with phosphorus pentachloride to generate PF 5 gas;

[0092] will PF 5 Gas pressurization (0.2MPa) is introduced into the reaction suspension for reaction, the reaction temperature is 10°C and the reaction pressure is 0.2MPa, and the mother liquor containing lithium hexafluorophosphate is synthesized;

[0093] (2) Add the mother liquor (8°C) containing lithium hexafluorophosphate dropwise into the crystallization tank with stirring, the dropping rate is 10L / h, and the first stirring rate is 50rpm;

[0094] (3) After adding all the mother liquor containing lithium hexafluorophosphate into the crystallization tank, turn on the ultrasonic generator, so that the mother liquor containing lithium hexafluorophosphate is placed in an ultrasonic environment to start cooling and crystallization, th...

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Abstract

The invention relates to the field of lithium hexafluorophosphate, and discloses lithium hexafluorophosphate, a crystal and a preparation method thereof, a lithium ion battery electrolyte and a lithium ion battery. The crystallization method comprises the following steps: (1) dropwise adding mother liquor containing lithium hexafluorophosphate into a crystallization tank under a first stirring condition; and (2) under a second stirring condition, cooling and crystallizing the mother liquor in the crystallization tank to obtain lithium hexafluorophosphate. According to the method, dynamic crystallization is provided, high-purity lithium hexafluorophosphate crystals can be obtained, the crystallization induction period can be effectively shortened, and the crystallization speed is increased.And the formed lithium ion battery is large in capacitance and high in cycle efficiency.

Description

technical field [0001] The invention relates to the field of lithium hexafluorophosphate preparation, in particular to lithium hexafluorophosphate and its crystallization and preparation method, lithium ion battery electrolyte and lithium ion battery. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high working voltage, high energy density (light weight), low self-discharge rate, no memory effect, long cycle life and no pollution. In recent years, lithium-ion batteries have rapidly occupied many fields with incomparable advantages over other batteries, and are widely used in mobile phones, notebook computers, small cameras, electric vehicles and other products. With the continuous development of electric vehicles, the amount of lithium-ion batteries is bound to increase. The application shows that the lithium-ion battery is an ideal green energy source. As everyone pays more and more attention to environmental protection, the use of l...

Claims

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Application Information

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IPC IPC(8): C01D15/00B01D9/02H01M10/0525H01M10/0568
CPCC01D15/005B01D9/00H01M10/0568H01M10/0525H01M2300/0025C01P2006/80C01P2006/82C01P2004/61C01P2004/60Y02E60/10
Inventor 莫延存李有柱徐长科毛连治金建泽
Owner HUIZHOU BYD BATTERY
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