1 Scope
This standard specifies the terms and definitions, general requirements, sampling requirements and test method of electrolyte for vanadium flow battery, including the determination methods of vanadium content, sulfate content, silicon content, iron content, nitrogen content, content of other elements (K, Na, Al), conductivity, density and viscosity.
This standard is applicable to electrolyte for vanadium flow battery with sulfuric acid as solvent.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 601-2002 Chemical reagent - Preparations of reference titration solutions
GB/T 602-2002 Chemical reagent - Preparations of standard solutions for impurity
GB/T 603-2002 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 622-2006 Chemical reagent - Hydrochloric acid
GB/T 625-2007 Chemical reagent - Sulfuric acid
GB/T 626-2006 Chemical reagent - Nitric acid
GB/T 629-1997 Chemical reagent - Sodium hydroxide
GB/T 633-1994 Chemical reagent - Sodium nitrite
GB/T 639-2008 Chemical reagent - Sodium carbonate anhydrous
GB/T 643-2008 Chemical reagent - Potassium permanganate
GB/T 652-2003 Chemical reagent - Barium chloride dihydrate
GB/T 657-2011 Chemical reagent - Hexaammonium heptamolybdate tetrahydrate
GB/T 658-2006 Chemical reagent - Ammonium chloride
GB/T 661-2011 Chemical reagent - Ammonium iron (II) sulfate hexahydrate
GB/T 676-2007 Chemical reagent - Acetic acid
GB/T 679-2002 Chemical reagent - Ethanol
GB/T 694-1995 Chemical reagent - Sodium acetate anhydrous
GB/T 696-2008 Chemical reagent - Urea
GB 1259-2007 Working chemical - Potassium dichromate
GB/T 1282-1996 Chemical reagent - Phosphoric acid
GB/T 1289-1994 Chemical reagent - Sodium oxalate
GB/T 1396-1993 Chemical reagents - Ammonium sulfate
GB/T 6680-2003 General rules for sampling liquid chemical products
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods (ISO 3696:1987, MOD)
GB/T 6685-2007 Chemical reagent - Hydroxylammonium chloride
GB/T 7729-1987 Chemical analysis of metallurgical products - General rule for spectrophotometric methods
GB/T 9725-2007 Chemical reagent - General rule for potentiometric titration
GB/T 9854-2008 Chemical reagent - Oxalic acid dihydrate
GB/T 10247-2008 Methods of viscosity measurement
GB/T 15347-1994 Chemical reagent - L-Ascorbic acid
HG/T 4018-2008 Chemical reagent - 1,10-Phenanthroline [Bound volume HG/T 4010~4021-2008]
JB/T 8278-1999 Test solutions of electric conductivity analyzers - Preparation method of sodium chloride solutions
SH/T 0173-1992 Technical specification for glass capillary viscometer
SL 78-1994 Determination of conductivity (conductivity instrument method)
JJG 155-1991 Routine capillary viscometer
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
vanadium flow battery, VFB
energy storage device that realizes the mutual conversion of electric energy and chemical energy through the electrochemical reaction of vanadium ions with different valences in positive and negative electrolyte, also known as vanadium flow battery system
Note: The vanadium flow battery is mainly composed of power unit (electric pile or module), energy storage unit (electrolyte and storage tank), electrolyte delivery unit (pipeline, valve, pump, heat exchanger, etc.) and battery management system, etc.
3.2
electrolyte
solution containing vanadium ions in different valence states with ionic conductivity
3.3
electrolyte (3.5 valence)
electrolyte with a valence state of 3.5, of which, the molar concentration ratio of trivalent vanadium ions to tetravalent vanadium ions is 1: 1
3.4
positive electrolyte
electrolyte when the battery works, of which the composition is different from that of electrolyte (3.5 valence) due to the change of valence state of vanadium ions. Positive electrolyte is the solution in the battery anode tank, and only contains tetravalent and pentavalent vanadium ions
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Sampling requirements
6 Test method
Annex A (Informative) Determination of vanadium content
Annex B (Informative) Determination of vanadium content
