YS/T 1302-2019 in English

Interpretation of the core content of the standard

This standard specifies the key technical indicators of bis(fluorosulfonyl)imide lithium salt (molecular formula: FNO₄S₂Li) as a power battery electrolyte:

Analysis of key technical requirements

1. Chemical composition control

The standard constructs a complete quality control system through main component + 26 impurity indicators:

• The residue method is used to calculate the main component content (100% minus the total impurities)
• Specially control corrosive impurities such as fluoride (≤0.01%) and chloride (≤0.001%)
• DMC insoluble matter index (≤0.05%) to ensure electrolyte compatibility

2. Special detection methods

Recommendations for the implementation of the standard

Key points for production control

1. Raw material storage humidity needs to be ＜0.001%RH
2. Packaging needs to be carried out in an inert gas protection environment
3. Use double-layer packaging (HDPE pot + aluminum-plastic bag) to prevent moisture

Application precautions

This material decomposes in water to produce HF. Laboratory operations require:

• Equipped with emergency flushing device
• Use fluororubber gloves for protection
• Waste needs to be neutralized with lime water

Analysis of standard evolution

Main improvements compared to the earlier version:

• Added heavy metal indicators such as As/Cd/Pb (new in 2019 version)
• Moisture requirement increased from 0.01% to 0.005%
• Clarified summer cold chain transportation requirements