GB/T 38887-2020Spherical graphite (English PDF)
球形石墨
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 2, 2020
Implementation date
January 1, 2021
Scope
GB/T 38887-2020 is the English-translated version of 球形石墨.
GB/T 38887-2020 is the Chinese standard "Spherical graphite". Its scope clause reads: This Standard specifies the terms and definitions, grading, code, technical requirements, test methods, inspection rules, packaging, storage and transportation of spherical graphite.
This Standard applies to spherical graphite used in the negative electrode of lithium-ion batteries. Its clauses include terms and definitions; grading and code; technical requirements; test methods; inspection rules; product packaging, storage and transportation.
It was issued by the State Administration for Market Regulation on JUNE 02, 2020 and took effect on DECEMBER 01, 2020.
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Document preview — GB/T 38887-2020
National Standard of the People's Republic of China
- ICS
- 29.050
- Classification
- Q 53
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Grading and code5
- 5 Technical requirements5
- 6 Test methods9
- 7 Inspection rules10
- 8 Product packaging, storage and transportation11
- Appendix A (Normative) Method for determining degree of sphericity12
- Appendix B (Normative) Method for determining trace metal elements15
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This Standard specifies the terms and definitions, grading, code, technical requirements, test methods, inspection rules, packaging, storage and transportation of spherical graphite.
This Standard applies to spherical graphite used in the negative electrode of lithium-ion batteries.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) is applicable to this document.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 1427 Sample method of carbon material
GB/T 3521 Method for chemical analysis of graphite
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values
3 Terms and definitions
The following term and definition apply to this document.
4 Grading and code
4.1 Product grading
Spherical graphite is represented by SG. Its specific grades are shown in Table 1.
4.2 Code
The product code is composed of the product name, grade code, median diameter (D50), fixed carbon content and tap density in sequence, namely.
5 Technical requirements
5.1 Appearance
A powder of gray black or steel gray.
5.2 Physical and chemical indexes
The physical and chemical indexes of spherical graphite shall meet the requirements of Table 1. If there are special requirements, the supplier and the purchaser shall negotiate and determine.
6 Test methods
6.1 Appearance
Observe visually under natural light conditions.
6.2 Particle size distribution
Determine in accordance with the provisions of Appendix A in GB/T 24533-2019.
6.3 Moisture
Determine in accordance with the provisions of Appendix B in GB/T 24533-2019.
6.4 pH value
Determine in accordance with the provisions of Appendix C in GB/T 24533-2019.
6.8 Tap density
Determine in accordance with the provisions of Appendix M in GB/T 24533-2019.
6.9 Magnetic substance
Determine in accordance with the provisions of Appendix K in GB/T 24533-2019.
6.10 Trace metal elements
Determine in accordance with the provisions of Appendix B.
6.11 Sulfur content
Determine in accordance with the provisions of Appendix J in GB/T 24533-2019.
6.12 F-, Cl-, Br-, SO42-, NO3-
Determine in accordance with the provisions of Appendix I in GB/T 24533-2019.
7 Inspection rules
7.1 Sampling method
7.1.1 Sampling and sample preparation are carried out in accordance with the provisions of GB/T 1427. The sampling drill is stainless steel designation 316 or equivalent; with a diameter of not more than 30 mm and a length of 500 mm~700 mm.
7.1.2 After the sample is placed in a polyethylene plastic container, a label shall be affixed to the outer wall. The label shall include the following.
7.1.3 The samples shall be sealed and stored. The storage period of spare samples is 18 months.
7.2 Inspection classification
7.2.1 Exit-factory inspection. For each lot, after the particle size, carbon content, moisture, tap density, specific surface area, trace elements (iron, sodium, chromium, copper, nickel, aluminum and molybdenum), and magnetic substances (iron + chromium + nickel + zinc + cobalt) pass the inspection, the quality inspection report will be attached.
7.3 Acceptance rules
7.3.1 The product is qualified if it meets all technical indexes in Table 1, Table 3, Table 4 and Table 5. If 1 index fails to meet the requirements of the standard, double number of samples shall be taken from the sampling bag of the same lot of products, to re-inspect the unqualified item.
8 Product packaging, storage and transportation
8.1 The packaging of the product meets the requirements of GB/T 191. The net weight is negotiated between the supplier and the purchaser.
8.2 The packaging shall be carried out in a dry environmental conditions. First put the product into a waterproof packaging bag (PE sealed bag and aluminum-plastic sealed bag are recommended). Special packaging requirements shall be negotiated between the supplier and the purchaser.
8.4 Products shall be stored in a ventilated and dry warehouse.
8.5 The stacking of products shall be neat and clean. Markings such as production lot number shall be clearly identifiable.
8.7 During storage and transportation, it shall be ensured that the product packaging is clean and undamaged. Any product, which leaks out of the package, must not be returned to the package. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 191Graphical symbols marking for handling and storage of packages
- GB/T 1427Sample method of carbon material
- GB/T 3521Methods for chemical analysis of graphite
- GB/T 6682Water for analytical laboratory use - Specification and test methods
- GB/T 8170Rules of rounding off for numerical values & expression and judgement of limiting values
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