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GB/T 38823-2020Silicon-carbon (English PDF)

硅炭

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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 38823-2020 is the English-translated version of 硅炭.

GB/T 38823-2020 is the Chinese standard "Silicon-carbon". Its scope clause reads: This Standard specifies the terms and definitions, classification and code, technical requirements, test methods, inspection rules, packaging, marking, transportation, and storage of silicon-carbon.

This Standard applies to all kinds of silicon-carbon anode materials for lithium-ion batteries. Its clauses include terms and definitions; classification and code; technical requirements; test methods; inspection rules; packaging, marking, 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 38823-2020

National Standard of the People's Republic of China

ICS: 29.050
Classification: Q 50

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative references4
3 Terms and definitions5
4 Classification and code5
5 Technical requirements6
5.1 Appearance6
5.2 Physical and chemical indicators6
6 Test methods7
6.1 Appearance7
6.2 Particle size distribution7
6.3 Specific surface area7
6.4 Tap density7
6.5 Carbon content7
6.6 Silicon content7
6.7 Compaction density7
6.8 Moisture content7
6.9 Magnetic impurities7
6.10 Content of trace metal elements7
6.11 Initial discharge specific capacity and initial coulombic efficiency7
6.12 Regulated substances7
7 Inspection rules8
7.1 Sampling method8
7.2 Inspection classification8
7.3 Acceptance rules9
8 Packaging, marking, storage, and transportation9
8.1 Packaging9
8.2 Marking9
8.3 Storage and transportation10
Appendix A (Normative) Determination method of carbon content11
Appendix B (Normative) Determination method of silicon content14
Appendix C (Normative) Determination method for the content of trace metal elements17
Appendix D (Normative) Determination method of initial discharge specific capacity and initial coulombic efficiency20

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, classification and code, technical requirements, test methods, inspection rules, packaging, marking, transportation, and storage of silicon-carbon.

This Standard applies to all kinds of silicon-carbon anode materials for 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) are applicable to this document.

GB/T 191 Packaging - Pictorial marking for handling of goods

GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection

GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (apply to inspection of process stability)

GB/T 3782 Acetylene black

GB/T 4369 Lithium

GB/T 5187 Copper and copper alloy foil

GB/T 6388 Transport package shipping mark

3 Terms and definitions

The following term and definition applies to this document.

3.1 Silicon-carbon

Composite powder material composed of silicon material and carbon material. The synergistic effect of silicon-carbon and cathode materials in a certain system can realize multiple charging and discharging of lithium-ion batteries.

4 Classification and code

The products are classified according to their initial discharge specific capacity; mainly divided into five categories.

5 Technical requirements

5.1 Appearance

Gray-black powder material, without agglomeration.

5.2 Physical and chemical indicators

The physical and chemical indicators of silicon-carbon shall meet the requirements in Table 1.

6 Test methods

6.1 Appearance

Visually observe under natural light conditions.

6.2 Particle size distribution

Determine according to GB/T 19077. Test conditions. Refractive index 2.61.

6.3 Specific surface area

Determine according to GB/T 19587.

6.4 Tap density

Determine according to GB/T 24533.

6.8 Moisture content

Determine according to GB/T 24533.

6.9 Magnetic impurities

Determine according to GB/T 33827.

6.10 Content of trace metal elements

Determine according to Appendix C.

6.11 Initial discharge specific capacity and initial coulombic efficiency

Determine according to Appendix D.

6.12 Regulated substances

Determine according to GB/T 26125.

7 Inspection rules

7.1 Sampling method

7.1.1 Sampling

Silicon-carbon is sampled according to GB/T 13732 "General rules for sampling inspection of bulk materials with uniform size".

7.1.2 Sample label

After the sample is placed in the plastic sample jar, a label shall be attached to the outer wall. The label shall include the following. […]

7.1.3 Storage of samples

The samples shall be sealed and stored in an environment protected from bag break, rain and moisture. The effective storage period of spare samples is 12 months.

7.2 Inspection classification

7.3 Acceptance rules

7.3.1 Products that meet the requirements of technical indicators in Table 1 are conformity products. If there is 1 indicator that 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 nonconformity item. If all the re-inspections are conformity, it will be judged as conformity. If one item is nonconformity, it will be judged as nonconformity.

8 Packaging, marking, storage, and transportation

8.1 Packaging

8.1.1 The packaging of the product shall comply with the provisions of GB/T 191. The net weight shall be negotiated by both the supplier and the purchaser.

8.2 Marking

The marking shall comply with the provisions of GB/T 6388. It shall generally include the following contents. It can also be marked according to customer needs.

8.3 Storage and transportation

8.3.1 Products shall be stored in a ventilated and dry warehouse.

8.3.2 The stacking of products shall be neat and clean. Marks such as production lot numbers shall be clearly identifiable. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

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