Trace Element Impurity Limits in Recycled Battery Precursor Hydroxides
Recycled precursor hydroxides demand strict trace impurity limits below 100 ppm total metals to prevent cathode microcracking and rapid cell capacity fade.
GB/T 26300 Standard
Meaning
National standards in China specify the physical and chemical properties required for lithium cobalt oxide used in lithium ion battery production. Within the metallurgical industry, gb/t 26300 standard defines the maximum allowable levels of impurities such as iron and copper. This specification ensures that the cathode materials are suitable for high energy density applications.
Chemical Specification
Purity levels are measured to guarantee that the lithium and cobalt content stays within the narrow range required for stable cycling. The gb/t 26300 standard requires that the moisture content remains below a specific threshold to prevent electrolyte degradation. These limits are used by quality control labs to accept or reject batches of raw material.
Testing Protocol
Manufacturers must follow defined analytical methods to determine the particle size distribution and the tap density of the powder. Under the gb/t 26300 standard, the pH value of the material is checked to ensure that it will not react prematurely with the binder in the electrode slurry. This consistency allows for the mass production of cells with uniform performance.
Analytical instruments must be calibrated against certified reference materials to maintain the integrity of the results. Detailed reports of these tests are provided to the buyer as part of the certificate of analysis.
Quality Threshold
Magnetic impurities are strictly limited because they can cause internal short circuits in the finished battery. Because the gb/t 26300 standard is a benchmark for the industry, compliance is often a requirement for selling cathode materials into the Chinese market. The standard is updated periodically to keep pace with improvements in battery technology.