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Diaphragm for full-vanadium ionic liquid flow battery, preparation method and battery comprising diaphragm

A liquid flow battery and vanadium ion technology, which is applied to fuel cell components, fuel cells, secondary batteries, etc., can solve the problem of large vanadium ion permeability and water mobility, low vanadium ion permeability and water mobility, etc. question

Active Publication Date: 2011-04-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is in order to overcome the defect that the vanadium ion permeability and water mobility of existing Nafion film are bigger, provide a kind of diaphragm that vanadium ion permeability and water mobility are less all-vanadium ion flow battery

Method used

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  • Diaphragm for full-vanadium ionic liquid flow battery, preparation method and battery comprising diaphragm
  • Diaphragm for full-vanadium ionic liquid flow battery, preparation method and battery comprising diaphragm
  • Diaphragm for full-vanadium ionic liquid flow battery, preparation method and battery comprising diaphragm

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preparation example Construction

[0032] The separator for the all-vanadium ion flow battery prepared by the method provided by the invention can be directly used in the production of the all-vanadium ion flow battery. However, usually, the separator prepared by the method provided by the invention needs to be stored for a period of time. Time can be used in subsequent production. For the convenience of storage, it is preferable to include a drying step at 70-90° C. after the above preparation method.

[0033] In addition, the present invention also provides an all-vanadium ion flow battery, the all-vanadium ion flow battery includes two electrolyte pools and a diaphragm, and the electrolyte pools hold the anode vanadium ion electrolyte and the cathode vanadium ion respectively Electrolyte, the diaphragm separates the two electrolyte pools, wherein the diaphragm is the diaphragm for the all-vanadium ion flow battery provided by the present invention. In the present invention, the anolyte and catholyte are not ...

Embodiment 1

[0037] This example is used to illustrate the separator for an all-vanadium ion flow battery provided by the present invention and its preparation method.

[0038] Select a polyaniline homogeneous membrane with a porosity of 50% (the degree of polymerization is 1000, the pore diameter is 160 nanometers, and the ion exchange capacity is 0.4 mmol H) with a size of 10 cm × 10 cm × 0.3 mm. + / g, thickness is 0.25mm), and make it successively with 4% by weight of H of 400 milliliters 2 o 2 The solution was contacted with 400 ml of 0.3 mol / l dilute sulfuric acid solution for 1.5 hours and then with 400 ml of 99.5% by weight acetone solution at 55° C. for 1 hour. The above-mentioned pretreated porous cationic membrane matrix is ​​contacted with the Nafion solution of 5% by weight at a concentration of 150 milliliters, then dried at 80° C. for 10 minutes, and the porous cationic membrane matrix is ​​contacted with the Nafion solution and the subsequent drying step Repeat for 5 times...

Embodiment 2

[0040] This example is used to illustrate the separator for an all-vanadium ion flow battery provided by the present invention and its preparation method.

[0041] Select a polytetrafluoroethylene homogeneous membrane with a porosity of 60% (the degree of polymerization is 800, the pore diameter is 160 nanometers, and the ion exchange capacity is 0.3 mmol H) with a size of 10 cm × 10 cm × 0.3 mm. + / g, the thickness is 0.2 mm), and make it sequentially with 400 ml of 3% H 2 o 2The solution was contacted with 400 ml of 0.1 mol / l dilute sulfuric acid solution for 3 hours and then with 400 ml of 99.5% by weight acetone solution at 50° C. for 2 hours. The porous cationic membrane matrix through above-mentioned pretreatment is contacted with the Nafion solution of 5% by weight with the concentration of 500 milliliters, dried 15 minutes at 70 ℃ afterwards, and makes described porous cationic membrane matrix contact with Nafion solution and the subsequent drying step Repeat for 4 t...

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Abstract

The invention provides a diaphragm for a full-vanadium ionic liquid flow battery. The diaphragm for the full-vanadium ionic liquid flow battery comprises a porous composite membrane and water-soluble metal salt attached into pores of the porous composite membrane, wherein the porous composite membrane has cation exchange function, and the ion exchange capacity of the porous composite membrane is not less than 0.56mmol H+ / g. The invention also provides a preparation method for the diaphragm for the full-vanadium ionic liquid flow battery. The method comprises a step of attaching the water-soluble metal salt attached into the pores of the porous composite membrane, wherein the porous composite membrane has cation exchange function, and the ion exchange capacity of the porous composite membrane is not less than 0.56mmol H+ / g. The invention also provides the full-vanadium ionic liquid flow battery comprising the diaphragm for the full-vanadium ionic liquid flow battery. The diaphragm for the full-vanadium ionic liquid flow battery reduces the vanadium ion penetration rate and the water migration rate at the same time of ensuring enough proton exchange rate, so the diaphragm has more stable electrochemical performance such as circular charging and discharging performance.

Description

technical field [0001] The invention relates to a diaphragm for an all-vanadium ion flow battery, a preparation method for the diaphragm for an all-vanadium ion flow battery, and an all-vanadium ion flow battery comprising the diaphragm for an all-vanadium ion flow battery. Background technique [0002] With the rapid development of the national economy, the contradiction between energy, resources and environmental protection has become increasingly prominent. Adjusting the current power energy structure and developing large-scale utilization of renewable clean energy such as wind energy and solar energy have become the basic national policies for the development of electric energy in my country. The power generation process of renewable energy such as wind energy and solar energy has the characteristics of instability and discontinuity. It needs to be equipped with power storage devices to achieve continuous and stable power output and avoid large-scale vicious accidents ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M8/02H01M8/18H01M10/36H01M8/0241
CPCY02E60/12Y02E60/528Y02E60/10Y02E60/50
Inventor 王成李世彩
Owner BYD CO LTD
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