GB/T 38823-2020 English PDF (GBT38823-2020)

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GB/T 38823-2020: Silicon-carbon
GB/T 38823-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.050
Q 50
Silicon-carbon
硅炭
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 ... 5 
4 Classification and code ... 5 
5 Technical requirements ... 6 
5.1 Appearance ... 6 
5.2 Physical and chemical indicators ... 6 
6 Test methods ... 7 
6.1 Appearance ... 7 
6.2 Particle size distribution ... 7 
6.3 Specific surface area ... 7 
6.4 Tap density ... 7 
6.5 Carbon content ... 7 
6.6 Silicon content ... 7 
6.7 Compaction density ... 7 
6.8 Moisture content ... 7 
6.9 Magnetic impurities ... 7 
6.10 Content of trace metal elements ... 7 
6.11 Initial discharge specific capacity and initial coulombic efficiency ... 7 
6.12 Regulated substances ... 7 
7 Inspection rules ... 8 
7.1 Sampling method ... 8 
7.2 Inspection classification ... 8 
7.3 Acceptance rules ... 9 
8 Packaging, marking, storage, and transportation ... 9 
8.1 Packaging ... 9 
8.2 Marking ... 9 
8.3 Storage and transportation ... 10 
Appendix A (Normative) Determination method of carbon content ... 11 
Appendix B (Normative) Determination method of silicon content ... 14 
Appendix C (Normative) Determination method for the content of trace metal elements
... 17 
Appendix D (Normative) Determination method of initial discharge specific capacity
and initial coulombic efficiency ... 20 
Silicon-carbon
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
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
GB/T 13732 General rules for sampling inspection of bulk materials with uniform
size
GB/T 19077 Particle size analysis - Laser diffraction methods
GB/T 19587 Determination of the specific surface area of solids by gas adsorption
using the BET method
GB/T 21653 Nickel and Nickel-alloy Wire and Drawing Stock
GB/T 24533 Graphite negative electrode materials for lithium ion battery
GB/T 26125 Electrical and electronic products - Determination of six regulated
substances (lead, mercury, cadmium, hexavalent chromium, polybrominated
biphenyls, polybrominated diphenyl ethers)
GB/T 33827 Determination of magnetic impurities in anode nanomaterials for Li-
ion battery
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. During the charging process,
the silicon-carbon negative electrode accepts the intercalation of lithium ions. During
the discharging process, the lithium ions are extracted.
4 Classification and code
The products are classified according to their initial discharge specific capacity; mainly
divided into five categories:
- 400 mAh/g ≤ initial discharge specific capacity< 600 mAh/g; represented by SiC-I;
- 600 mAh/g ≤ initial discharge specific capacity< 900 mAh/g; represented by SiC-
Ⅱ;
- 900 mAh/g ≤ initial discharge specific capacity< 1200 mAh/g; represented by SiC-
Ⅲ;
- 1200 mAh/g ≤ initial discharge specific capacity< 1500 mAh/g; represented by SiC-
IV;
- Initial discharge specific capacity≥1500 mAh/g; represented by SiC-V.
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”. Insert a clean sampling drill (stainless
steel designation 316 or equivalent; diameter: no more than 30 mm) into the package
along the axis. The insertion depth must not be less than 4/5 of the package. Take
samples within 20 mm around the center axis of the material in the package. Sampling
is carried out in accordance with the relevant provisions on sampling in GB/T 2828.1
and GB/T 2829.
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:
a) Sample category and number;
b) Overall material lot number and quantity;
c) Sample size;
d) Sampling date;
e) Name of sampler.
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
7.2.1 Exit-factory inspection
Inspect the specific surface area, tap density, compaction density, silicon content,
magnetic impurities, trace metal elements, 0.1 C initial discharge specific capacity, 0.1
C initial coulombic efficiency, and regulated substance content of each lot. After
passing the inspection, stamp the quality inspection seal.
7.2.2 Type inspection
Inspect all technical requirements specified in this Standard. Type inspection is carried
out in one of the following situations:
a) When the model and supplier of raw materials are changed;
b) When there is a change in the production technology process;
c) When the production equipment has been shut down for more than half a year and
starts production again;
d) When customers have special requirements;
e) Under normal circumstances, the type inspection shall be conducted at least once
a year.
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.
7.3.2 The manufacturer shall ensure that, the products that leave the factory meet the
requirements of this Standard. When leaving the factory, each lot of products is
accompanied with an inspection report.
7.3.3 The re-inspection period of the receiving party is 2 month...