Redox flow battery, electrode for redox flow battery, and electrode characteristic evaluation method

Patent metadata

Field	Value
Publication number	US-2019027770-A1
Application number	US-201616068160-A
Country	US
Kind code	A1
Filing date	Jan 7, 2016
Priority date	Jan 7, 2016
Publication date	Jan 24, 2019
Grant date	—

Abstract

Provided are a redox flow battery having a low internal resistance, an electrode used in a redox flow battery, and an electrode characteristic evaluation method with which a characteristic of an electrode can be simply and accurately evaluated. The redox flow battery includes at least one pair of electrodes in a stacked manner, the electrodes including a positive electrode and a negative electrode to which an electrolyte is supplied and in which a battery reaction is performed. In the redox flow battery, a total area of the electrodes is 40,000 cm 2 or more, and a sticking ratio is 1% or more, the sticking ratio being a value determined by, in a state in which a sample taken from an arbitrary position of the stacked electrodes and having a predetermined size is horizontally placed, dropping a predetermined amount of pure water from above the sample, vertically placing the sample on which the pure water has been dropped, subsequently measuring a mass of the sample, and dividing an amount calculated by subtracting, from the measured value, a mass of the sample before the dropping by a mass of the dropped pure water.

First claim

1 . An electrode characteristic evaluation method for evaluating a characteristic of an electrode used in a storage battery including an electrolyte, the method comprising:
a step of, in a state in which a sample taken from the electrode and having a predetermined size is horizontally placed, dropping a predetermined amount of pure water from above the sample; and a step of vertically placing the sample on which the pure water has been dropped, and subsequently measuring a mass of the sample to examine an amount of the pure water stuck to the sample.

2 . A redox flow battery comprising at least one pair of electrodes in a stacked manner, the electrodes including a positive electrode and a negative electrode to which an electrolyte is supplied and in which a battery reaction is performed,
wherein a total area of the electrodes is 40,000 cm 2 or more, and a sticking ratio is 1% or more, the sticking ratio being a value determined by, in a state in which a sample taken from an arbitrary position of the stacked electrodes and having a predetermined size is horizontally placed, dropping a predetermined amount of pure water from above the sample, vertically placing the sample on which the pure water has been dropped, subsequently measuring a mass of the sample, and dividing an amount calculated by subtracting, from the measured value, a mass of the sample before the dropping by a mass of the dropped pure water.

3 . The redox flow battery according to claim 2 , wherein a variation in the sticking ratio in the positive electrode and a variation in the sticking ratio in the negative electrode are each 5% or less.

4 . The redox flow battery according to claim 2 or 3 , wherein the sticking ratio is 95% or more.

5 . An electrode for a redox flow battery, the electrode being used in a redox flow battery to which an electrolyte is supplied and in which a battery reaction is performed,
wherein the electrode has an area of 500 cm 2 or more, and a sticking ratio is 1% or more, the sticking ratio being a value determined by, in a state in which a sample taken from an arbitrary position of the electrode and having a predetermined size is horizontally placed, dropping a predetermined amount of pure water from above the sample, vertically placing the sample on which the pure water has been dropped, subsequently measuring a mass of the sample, and dividing an amount calculated by subtracting, from the measured value, a mass of the sample before the dropping by a mass of the dropped pure water.

Assignees

• Sumitomo Electric Industries

Inventors

• Shiraki Kosuke
• Kanno Takashi
• Ito Takefumi
• Kuwabara Masahiro
• Yamaguchi Hideyuki
• Fujita Hayato
• Hayashi Kiyoaki
• Moriuchi Kiyoaki

Classifications

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/049

  Processes for forming or storing electrodes in the battery container · CPC title

• H01M4/0447

  of complete cells or cells stacks · CPC title

• H01M8/18 Primary

  Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title