YB/T 5222-2014Quality hot rolled and forged carbon structural steel round tube blank (English PDF)

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020

"Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents".

YB/T 6139 "Test methods for graphite-type negative electrode materials" is divided

into the following two parts:

- Part 1: Determination of graphitization;

- Part 2: Determination of oil absorption value.

This document is Part 1 of YB/T 6139.

Attention is drawn to the possibility that some of the elements of this document may be

the subject of patent rights. The issuing authority shall not be held responsible for

identifying any or all such patent rights.

This document was proposed by China Iron and Steel Association.

This document shall be under the jurisdiction of National Technical Committee on Steel

of Standardization Administration of China (SAC/TC 183).

The drafting organizations of this document: B&T New Materials Group Co., Ltd.,

Guangdong Brunp Recycling Technology Co., Ltd., Shanxi Coal Chemistry Research

Institute of the Chinese Academy of Sciences, Henan Yicheng Hanbo Energy

Technology Co., Ltd., and Metallurgical Industry Information Standards Research

Institute.

Main drafters of this document: Wang Yuhui, Sun Hua, Zhang Ruifang, Xie Yinghao,

Huang Xianhong, Cui Qiang, Zhang Nan, Wang Xiaoyuan, Tang Jianxiao, Yu Hongxing,

Li Zikun, Dai Haitao, Li Fei, Huang Youyuan, Zhang Qinglai.

This document is first issued.

Test methods for graphite-type negative electrode materials -

Part 1: Determination of graphitization

1 Scope

This document specifies terms and definitions, principles, test procedures, precision,

test reports for determination methods for graphitization of graphite-type negative

electrode materials.

This document is applicable to the determination of the graphitization degree of

graphite negative electrode materials using X-ray diffractometer (XRD).

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

GB/T 8170, Rules of rounding off for numerical values and expression and

judgement of limiting values

GB/T 24533, Graphite negative electrode materials for lithium ion battery

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

4 Principle

When X-rays are projected into graphite crystals, they are scattered by atoms and

electrons in the crystals. Due to the periodic arrangement of atoms in the crystals, there

is a fixed phase difference between these scattered waves, which interfere in space,

causing the scattered waves to reinforce each other in some scattering directions and

cancel each other out in some directions, thus causing diffraction. The diffractometer

automatically records the diffraction pattern of the sample and analyzes the diffraction

pattern to obtain sample information.

Crystalline silicon (the diffraction angle of the 111 plane is 28.442°) is used as an

internal standard. By adding crystalline silicon to the sample to be tested, the diffraction

angle of the (002) plane in the graphite crystal can be accurately located (at around

26.5°). The graphite interlayer spacing (d002) is calculated using the Bragg equation.

The graphitization degree is then calculated using the Franklin equation.

5 Reagents and materials

6 Instruments and equipment

7 Sample

The samples shall comply with the requirements of GB/T 24533.

8 Test steps