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A device and method for electrolytically preparing high-purity lithium hexafluorophosphate by electrochemical ion extraction

A technology of lithium hexafluorophosphate and extraction method, applied in the fields of materials and energy, can solve problems such as difficult separation, and achieve the effects of ultra-high purity, ultra-high cycle stability, and lower production costs

Active Publication Date: 2021-01-15
SHENZHEN JANAENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But during the reaction process PF 5 It is easy to react with organic solvents and produce a large amount of impurities, while LiPF 6 inseparable

Method used

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  • A device and method for electrolytically preparing high-purity lithium hexafluorophosphate by electrochemical ion extraction
  • A device and method for electrolytically preparing high-purity lithium hexafluorophosphate by electrochemical ion extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 As shown, the electrode composition of the two electrolyzers, the composition of the electrolyte and the way of charging and discharging are as follows:

[0029] Electrolyzer A: made of polyaniline (PANI) for reversible deintercalation PF 6 - Compound reduced state anode-KPF 6 The aqueous solution is the electrolyte-Nafion117 proton exchange membrane-LiCl solution-lithium manganate (Li 1-x MnO 4 ) is the reversible deintercalation Li + Composition of compound oxidation state cathode; take 5cm each of the above electrode sheets 2 , at 5mA·cm 2 The constant current discharges until the voltage is less than 0V, and the anode PANI loses the electron capture PF 6 - Form PANI + PF 6 - , cathode Li1-x MnO 4 Gain electron capture Li + Form LiMn 2 o 4 , the relation curve between discharge voltage and capacity is shown as figure 2 shown by figure 2 It can be seen that the average discharge voltage is 0.49V.

[0030] Electrolyzer B: made of LiMnO...

Embodiment 2

[0032] Such as figure 1 As shown, the electrode composition of the two electrolyzers, the composition of the electrolyte and the way of charging and discharging are as follows:

[0033] Electrolyzer A: made of polyaniline (PPy) for reversible deintercalation PF 6 - Compound reduced state anode-KPF 6 The aqueous solution is the electrolyte-Nafion117 proton exchange membrane-brine-lithium iron phosphate (Li 1-x FePO 4 ) is the reversible deintercalation Li + Compound oxidation state cathode composition; take each of the above electrode sheets 10cm 2 , at 10mA·cm 2 The constant current discharges until the voltage is less than 0V, and the anode PPy loses the electron capture PF 6 - Form PPy + PF 6 - , cathode Li 1-x FePO 4 Gain electron capture Li + Form LiFePO 4 , the average discharge voltage is 0.12V.

[0034] Electrolyzer B: made of LiFePO 4 for reversible deintercalation of Li + Compound reduced anode-LiPF6 solution as electrolyte-PPy + PF 6 - PF 6 - C...

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Abstract

The invention belongs to the field of materials and energy, and in particular relates to a device and method for electrolytically preparing high-purity lithium hexafluorophosphate based on an electrochemical ion extraction method. It includes an electrolytic cell A and an electrolytic cell B; the electrolytic cell A is composed of de-intercalating anion and cationic material electrodes, and the two electrolyte solutions can be separated by an ion exchange membrane; the electrolytic cell B is composed of two electrodes of the electrolytic cell A , in the corresponding electrolyte system, the extracted anions and cations are electrochemically released through two electrodes respectively to form a target salt solution, and the corresponding electrolyte salt is obtained by a solvent treatment method. The invention effectively avoids the impurity pollution that may be introduced in the traditional electrolyte salt preparation process, and at the same time can prepare some salts that are difficult to synthesize by traditional methods, and provides a feasible method for improving the quality of the electrolyte salt and developing the preparation of new electrolyte salts.

Description

technical field [0001] The invention belongs to the field of materials and energy, and specifically relates to a device and a method for electrolytically preparing high-purity ion battery electrolyte salt lithium hexafluorophosphate based on an electrochemical ion extraction method. Background technique [0002] The widespread popularization of new energy electric vehicles and smart grids has driven the continuous development of power batteries. As an important part of batteries, LiPF 6 With its excellent electrochemical stability, oxidation resistance, high conductivity, passivation of the positive electrode current collector, favorable for the formation of negative electrode SEI and environmental friendliness, it has become an irreplaceable electrolyte salt for lithium batteries, and its quality determines the battery Excellent charge and discharge performance, cycle life and safety. However, to produce high quality LiPF 6 The required raw materials LiF and HF have extre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/24C25B13/02C25B9/19
CPCC25B1/245C25B13/02C25B9/19
Inventor 曹余良赵阿龙艾新平杨汉西
Owner SHENZHEN JANAENERGY TECH CO LTD