Electrolytic liquid crystal containing chlorine and vanadium as well as preparation method and application of electrolytic liquid crystal

An electrolyte and crystal technology, applied in the field of electrolyte, can solve the problems of difficult configuration and high transportation cost of flow battery electrolyte, and achieve the effects of reducing the loss of chlorine, saving transportation costs, and alleviating the intensity

Pending Publication Date: 2022-04-12
大连融科储能集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to propose a vanadium-containing electrolytic liquid crystal, which is transported to the project site and uses water to displace the liquid crystal Dissolved, you can get a qualified electrolyte, which will greatly reduce the cost of transportation

Method used

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  • Electrolytic liquid crystal containing chlorine and vanadium as well as preparation method and application of electrolytic liquid crystal

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Embodiment 1

[0026] This embodiment discloses a method for preparing a vanadium-containing electrolytic liquid crystal, comprising the following steps:

[0027] Step 1. Dissolve 250gVO with 1L10.5mol / L industrial concentrated hydrochloric acid 2 , filtered to obtain vanadium oxychloride solution;

[0028] Step 2. Use the electrolytic stack for direct current electrolysis to obtain V 3+ :VO 2+ = 1 solution;

[0029] The current density is 100mA / cm 2 ;Voltage range 0~1.8V;

[0030] The above solution was cooled to -30°C, stirred, and seeded, filtered to obtain H 3 VCl 6 crystal;

[0031] Step 3, above-mentioned crystal and vanadyl sulfate, VOHPO 4 , mixed according to the mass ratio of 1:0.9:0.1 to obtain the mixed crystal of Cl:V:S:P=6:2:0.9:0.1 (H 3 VCl 6 , vanadyl sulfate, VOHPO 4 );

[0032] When used as an electrolytic solution containing vanadium chloride, the above-mentioned crystals are dissolved in water to obtain a solution with a vanadium concentration of 2.5 mol / L.

...

Embodiment 2

[0035] This embodiment discloses a method for preparing a vanadium-containing electrolytic liquid crystal, comprising the following steps:

[0036] Step 1. Dissolve 280gVO with 1L10.5mol / L concentrated hydrochloric acid 2 , filtered to obtain vanadium oxychloride solution;

[0037] Step 2. Use the electrolytic stack for direct current electrolysis to obtain V 3+ = 60% solution;

[0038] The current density is 100mA / cm 2 ;Voltage range 0~1.8V;

[0039] The above solution was cooled to -20°C, stirred, and seeded, filtered to obtain H 3 VCl 6 green crystals;

[0040] Step 3, combine the above crystal with VOCL 2 , mixed according to the mass ratio of 1:1 to obtain Cl:V=4:1 mixed crystals (H 3 VCl 6 :VOCL 2 );

[0041] When used as an electrolytic solution containing vanadium chloride, the above-mentioned crystals are dissolved in water to obtain a solution with a vanadium concentration of 2.2 mol / L.

[0042] The above solution is injected into the positive electrode s...

Embodiment 3

[0044] This embodiment discloses a method for preparing a vanadium-containing electrolytic liquid crystal, comprising the following steps:

[0045] Step 1. Dissolve 300gVO with 1L10.5mol / L concentrated hydrochloric acid 2 , filtered to obtain vanadium oxychloride solution;

[0046] Step 2. Use the electrolytic stack for direct current electrolysis to obtain V 3+ = 100% solution;

[0047] The current density is 100mA / cm 2 ;Voltage range 0~1.8V;

[0048] The above solution was cooled to 0°C, stirred, and seeded, filtered to obtain H 3 VCl 6 green crystals;

[0049] Step 3, the above crystal and VOCl2 、VPO 4 , mixed according to the mass ratio of 0.95:1:0.05 to obtain mixed crystals (H 3 VCl 6 、VOCl 2 、VPO 4 );

[0050] When used as an electrolytic solution containing vanadium chloride, the above-mentioned crystals are dissolved in water to obtain a solution with a vanadium concentration of 2.3 mol / L.

[0051] The above solution is injected into the positive and nega...

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Abstract

The invention provides a chlorine-vanadium-containing electrolytic liquid crystal as well as a preparation method and application thereof. The chlorine and vanadium-containing electrolytic liquid crystal comprises H3VCl6. NH2O, VOCl2, sulfate and a phosphorus source, the sulfate is VOSO4 and / or V2 (SO4) 3. NH2O, and the phosphorus source is VOHPO4 and / or VPO4. The molar ratio of trivalent vanadium to tetravalent vanadium in the chlorine-vanadium-containing electrolytic liquid crystal is 0.9-1.1; the molar ratio of Cl to V is 2-6; the molar ratio of Cl to S is (20: 1)-(2: 1); the molar ratio of V to P is 20-200. The invention also discloses a preparation method of the chlorine-vanadium-containing electrolytic liquid crystal. According to the invention, the chlorine-vanadium-containing electrolyte is crystallized, and is dissolved by adding water in a project site to prepare the electrolyte, so that the transportation cost of the electrolyte is greatly reduced.

Description

technical field [0001] The invention relates to electrolyte technology, in particular to a vanadium-chloride-containing electrolytic liquid crystal, its preparation method and application. Background technique [0002] In the vanadium hydrochloride electrolyte, due to the presence of chlorine, the complexation of chlorine inhibits the precipitation of pentavalent vanadium in the charged state, so this electrolyte has excellent high temperature stability. The allowable charge and discharge SOC window is also wider than that of the sulfuric acid system. For example, the charge and discharge SOC window of a typical sulfuric acid system vanadium electrolyte is 20-80%, which is to prevent the precipitation of pentavalent vanadium in a high SOC state, while the hydrochloric acid system Electrolyte, the charging and discharging SOC window can be relaxed to 10-90%, and even the upper limit can be relaxed to 100%. The concentration of vanadium in the hydrochloric acid system can als...

Claims

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Application Information

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IPC IPC(8): H01M8/18
Inventor 阎成友宋明明高新亮刘国昌许盛
Owner 大连融科储能集团股份有限公司
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