GB/T 20507-2018 in English
VALIDSpherical nickel hydroxide
- Issued on:2018-09-17
- Implemented on:2019-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$370.00
$359.00
$359.00
《GB/T 20507-2018球形氢氧化镍》由TC243（全国有色金属标准化技术委员会）归口，TC243SC4（全国有色金属标准化技术委员会粉末冶金分会）执行，主管部门为中国有色金属工业协会。
Introduction
Core changes in the standard revision
| Technical indicators | Requirements of the 2006 version | Requirements of the 2018 version | Range of change |
|---|---|---|---|
| Upper limit of Fe content | 0.01% | 0.005% | Reduce by 50% |
| Upper limit of Cu content | 0.01% | 0.005% | Reduce by 50% |
| Discharge platform rate | ≥65% | ≥70% | Increase by 5 percentage points |
| Grade system | Retain Zn3Col, etc. | Delete old grades such as Zn3Col | Structural optimization |
Product classification system
The standard divides spherical nickel hydroxide into three categories:
- Zinc-added type: Typical grade Zn3Co1.3, nickel content ≥57%, used for high-capacity batteries
- Cadmium-added type: Typical grade Cd3Co1, nickel content ≥57.5%, suitable for high-temperature environment
- Cobalt-coated type: Surface coated with 3-3.5% cobalt, such as Zn4Co1.3-Co3.5, to improve conductivity
X-ray diffractometer is used to detect β-crystal structure, (101) half-peak width requirement ≥0.85°
Key performance indicator comparison
| Grade | Specific capacity (mAh/g) | Tap density (g/cm³) | Particle size (D50,μm) |
|---|---|---|---|
| Zn3Co1.3 | ≥245 | ≥2.10 | 6-15 |
| Zn4Co1.3-Co3.5 | ≥225 | ≥1.50 | 8-25 |
| Cd3Co1 | ≥225 | ≥2.00 | 9-14 |
Innovation in detection methods
Main improvements in the new standard in chemical analysis:
- Atomic absorption spectrometry for the determination of 9 metal impurities, with a detection limit of 0.014μg/mL
- Barium sulfate gravimetric method for the determination of sulfate, with a repeatability limit of ≤0.008% (at 0.05% content)
- Newly added nitrate spectrophotometry, with detection at a wavelength of 410nm
The electrochemical test adopts the AA type nickel-hydrogen battery standard model, and the weight of the positive electrode dry powder is controlled at (5.8±0.1)g/piece
Implementation suggestions
- Raw material control: It is recommended to establish an early warning mechanism for Fe and Cu content and use ICP-MS for trace detection
- Process optimization: Cobalt-coated products need to be vacuum-sealed to prevent oxidation
- Test verification: It is recommended to perform 3 cycles of discharge platform rate test and take the average value
- Storage management: Strictly control the temperature and humidity of the warehouse ≤25℃/70%RH
Sample only — not a preview of GB/T 20507-2018
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