GB/T 38887-2020 English PDF (GBT38887-2020)
GB/T 38887-2020 English PDF (GBT38887-2020)
GB/T 38887-2020: Spherical graphite
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ISSUED ON: JUNE 02, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Grading and code ... 5
5 Technical requirements ... 5
6 Test methods ... 9
7 Inspection rules ... 10
8 Product packaging, storage and transportation ... 11
Appendix A (Normative) Method for determining degree of sphericity ... 12 Appendix B (Normative) Method for determining trace metal elements ... 15 Spherical graphite
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
GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 19587 Determination of the specific surface area of solids by gas
adsorption using the BET method
GB/T 24533-2019 Graphite negative electrode materials for lithium ion
GB/T 26125 Electrical and electronic products - Determination of six
regulated substances (lead, mercury, cadmium, hexavalent chromium,
polybrominated biphenyls, polybrominated diphenyl ethers)
3 Terms and definitions
The following term and definition apply to this document.
6 Test methods
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.
6.5 Fixed carbon content
Determine in accordance with the provisions of GB/T 3521.
6.6 Specific surface area
Determine in accordance with the provisions of GB/T 19587.
6.7 Degree of sphericity
Determine in accordance with the provisions of Appendix A.
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. c) When the equipment has been shut down for more than half a year and
production is started again;
d) When the client has special requirements.
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. If all the re-inspections are qualified, it is judged as qualified; if there is one unqualified, it will be judged as unqualified.
7.3.2 The re-inspection period of the receiver is 2 months. If there is any objection, double number of samples will be taken for re-inspection. If there is still a dispute, it will be inspected by a qualified third-party testing agency. 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.
8.3 The packaged product is then packaged with outer packaging materials, which 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.
8.6 Avoid mixed storage and transportation with items that can deteriorate the product or damage the packaging bag.
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.
the concentration is 1000 μg/mL;
h) Molybdenum standard solution: The standard number is GSB04-1737-
2004; the concentration is 1000 μg/mL;
i) Sodium standard solution: The standard number is GSB04-1738-2004; the concentration is 1000 μg/mL;
j) Silicon standard solution: The standard number is GSB04-1752-2004; the concentration is 1000 μg/mL.
B.2.5 Preparation of the stock mixed standard solution (50 mg/L): Respectively pipette 5 mL of iron, sodium, chromium, copper, nickel, aluminum, molybdenum, cobalt, zinc, and silicon standard solutions into 100 mL volumetric flask; ADD 5 mL of nitric acid; DILUTE to the scale mark, shake well and set aside. The shelf life is 1 month.
B.3 Instruments and equipment
B.3.1 Inductively coupled plasma emission spectrometer or equivalent-
B.3.2 Microwave digestion apparatus or digestion device with equivalent performance: Working temperature is not less than 180 °C.
B.3.3 Sample tank: Matched with microwave digestion apparatus.
B.3.4 Analytical balance: Sensitivity is 0.0001 g.
B.4 Preparation of a series of mixed standard solutions
Accurately pipette 0 mL, 0.2 mL, 0.50 mL, 1.00 mL, 2.00 mL, 5 mL of the stock mixed standard solution (see B.2.5) respectively into six 100 mL volumetric flasks; ADD 5 mL of nitric acid to each; DILUTE to the scale mark and shake well; prepare the calibration blank and series mixed standard solutions of Fe, Na, Cr, Cu, Ni, Al, Mo, Co and Zn with concentrations of 0 mg/L, 0.10 mg/L, 0.25 mg/L, 0.50 mg/L, 1.00 mg/L and 2.50 mg/L, respectively.
B.5 Sample preparation
WEIGH 0.4 g~0.5 g of sample in a clean digestion tank; ADD 3 mL of nitric acid, 9 mL of hydrochloric acid; SHAKE well and tighten the sample cover; PLACE it in a microwave digestion apparatus for digestion (the digestion temperature is not less than 180 °C; the time is not less than 15 min). After digestion, cool to room temperature, filter, and dilute to 100 mL. MAKE a sample blank in the same way.