GB/T 38887-2020 PDF EnglishUS$205.00 · In stock · Download in 9 seconds
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Similar standardsGB/T 38887-2020: Spherical graphite---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38887-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.050 Q 53 Spherical graphite Issued on. JUNE 02, 2020 Implemented on. DECEMBER 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword... 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... 15ForewordThis Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of National Technical Committee 183 on Steel of Standardization Administration of China (SAC/TC 183). Drafting organizations of this Standard. Zhanjiang Juxin New Energy Co., Ltd., BTR New Material Group Co., Ltd., China Metallurgical Information and Standardization Institute. Main drafters of this Standard. Wu Qixiu, Xiao Wei, Liu Mingdong, Ye Yuzuo, Wu Youming, Zhao Juan, Shi Youli, Chen Nanmin, Ren Jianguo, Zhou Haihui, Zheng Jingxu. Spherical graphite1 ScopeThis 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 referencesThe 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 values3 Terms and definitionsThe following term and definition apply to this document.4 Grading and code4.1 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 requirements5.1 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 methods6.1 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 rules7.1 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 transportation8.1 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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