Standard No.:	NB/T 42006-2013
English Name:	Electrolyte for Vanadium Flow Battery-test Method
Chinese Name:	全钒液流电池用电解液 测试方法
Professional Classification:	NB    Professional Standard - Energy
Source Content Issued by:	National Energy Administration
Issued on:	2013-6-8
Implemented on:	2013-10-1
Status:	to be superseded
Superseded by:	NB/T 42006-2025
Superseded on:	2025-12-30
Target Language:	English
File Format:	PDF
Word Count:	9000 words
Translation Price(USD):	270.0
Delivery:	via email in 1 business day

Electrolyte for vanadium flow battery - Test method 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 3.5 negative 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. Negative electrolyte is the solution in the battery cathode tank, and only contains bivalent and trivalent vanadium ions 3.6 precipitation separation of active material in electrolyte from the electrolyte due to sediment or precipitation 3.7 active material material that receives and releases electric energy upon oxidation-reduction reaction in the charging and discharging process of the battery Note: The active materials in electrolyte of vanadium flow battery are vanadium ions with different valence states. 4 General requirements The following general requirements shall be followed when conducting electrolyte test: a) Unless otherwise specified, the purity of the reagents used in this standard shall be superior to analytical purity, the preparations and products used shall be prepared in accordance with GB/T 603-2002, and the water for test shall meet the requirements of Grade-III water in GB/T 6682-2008.

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