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GB/T 44027.1-2024: Determination method of carbon material - Part 1: Determination of first discharge specific capacity, first columbic efficiency, discharge capacity retention rate at different rates
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Determination method of carbon material - Part 1: Determination of first discharge specific capacity, first columbic efficiency, discharge capacity retention rate at different rates
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GB/T 44027.1-2024
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Basic data | Standard ID | GB/T 44027.1-2024 (GB/T44027.1-2024) | | Description (Translated English) | Determination method of carbon material - Part 1: Determination of first discharge specific capacity, first columbic efficiency, discharge capacity retention rate at different rates | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q52 | | Word Count Estimation | 10,123 | | Date of Issue | 2024-05-28 | | Date of Implementation | 2024-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44027.1-2024: Determination method of carbon material - Part 1: Determination of first discharge specific capacity, first columbic efficiency, discharge capacity retention rate at different rates
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 29.050
CCSQ52
National Standards of People's Republic of China
Determination methods for carbon materials Part 1.First discharge
Specific capacity, first coulombic efficiency, different magnifications
Determination of Capacitance Retention
Released on 2024-05-28
2024-12-01 implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 1 of GB/T 44027 "Determination methods for carbon materials". GB/T 44027 has been published in the following parts.
--- Part 1.Determination of initial discharge specific capacity, initial coulombic efficiency and retention rate of discharge capacity at different rates;
--- Part 2.Determination of expansion rate.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183).
This document was drafted by. BTR New Materials Group Co., Ltd., Guangdong Brunp Recycling Technology Co., Ltd., Shanxi Provincial Inspection and Testing
Center, Guoke Tanmei New Materials (Huzhou) Co., Ltd., Henan Yicheng Hanbo Energy Technology Co., Ltd., Henan Yicheng New Energy Co., Ltd.
Huayang New Materials Technology Group Co., Ltd., Shenzhen BTR New Energy Technology Research Institute Co., Ltd., Metallurgical Industry Information Standard Research Institute
Research Institute.
The main drafters of this document are. Li Zikun, Liu Yutong, Cheng Jianshan, Zhang Ruifang, Wan Sicheng, Chen Chengmeng, Cao Deyu, Wang Anle, Zhang Nan,
Wang Xiaoyuan, Tang Jianzhong, Yang Junjie, Gong Wenzhao, Yang Guangjie, He Zehan, Wang Yuhui, Huang Youyuan, Cui Qiang, and Wang Ruidan.
Introduction
GB/T 44027 "Determination methods for carbon materials" describes the determination methods for specified characteristics or indicators of carbon materials, aiming to provide reference for the relevant inspection of carbon materials.
To ensure the usability of the document, the document is divided into several parts, which are intended to be composed of the following parts.
--- Part 1.Determination of first discharge specific capacity, first coulombic efficiency, and retention of discharge capacity at different rates.
The material's first discharge specific capacity, first coulombic efficiency, and discharge capacity retention rate at different rates;
--- Part 2.Determination of expansion rate. The purpose is to determine the expansion rate of carbon material coating;
--- Part 3.Determination of lint content. The purpose is to determine the lint content in carbon materials.
Determination methods for carbon materials Part 1.First discharge
Specific capacity, first coulombic efficiency, different magnifications
Determination of Capacitance Retention
1 Scope
This document describes the use of button half cells to determine the first discharge specific capacity, first coulombic efficiency, and different
Reagents and materials, instruments and equipment, test steps, result calculation and data processing, and test report for rate discharge capacity retention rate.
This document applies to the first discharge of carbon negative electrode materials such as artificial graphite, natural graphite, carbon composite silicon oxide, silicon carbon, etc. for lithium-ion batteries
Determination of specific capacity, first coulombic efficiency and discharge capacity retention rate at different rates.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 4369 Lithium
GB/T 8170 Rules for rounding off values and expression and determination of limit values
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Reagents and Materials
4.1 Conductive carbon black. ash content ≤ 0.05%, moisture content ≤ 0.1%, specific surface area 50m2/g~80m2/g, median particle size D50
30nm~60nm.
4.2 Conductive graphite. ash content ≤ 0.05%, moisture content ≤ 0.1%, median particle size D50 100nm~300nm.
4.3 Acrylonitrile copolymer. viscosity >7300mPa·s (25℃, 1% solid content solution), median particle size D50≤1μm.
4.4 Sodium carboxymethyl cellulose (CMC), viscosity 3000mPa·s~5000mPa·s (25℃, 1% solid content solution), pH
6.0~8.5.
4.5 Styrene butadiene rubber (SBR), pH 5.0~7.5, median particle size D50 150nm~220nm.
4.6 Lithium metal sheet or ribbon. in accordance with the requirements of Li-3 grade in GB/T 4369, with a diameter of 16 mm to 19 mm and a thickness of 0.5 mm to
1.2mm.
4.7 Copper foil. thickness is 7mm~15mm.
4.8 Nickel foam. diameter is 14mm~19mm, thickness is 0.15mm~0.25mm.
4.9 Diaphragm. Polyethylene-polypropylene composite membrane, diameter 18mm~20mm.
4.10 Electrolyte. LiPF6 dissolved in organic solvents [ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate
(EMC) volume ratio of 1.1.1] to form a solution with a concentration of 1 mol/L.
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