To further improve the purity of battery-grade lithium carbonate, the following methods can be adopted:

Optimize the existing chemical precipitation method: Improve the precipitation effect by adjusting the type and dosage of precipitant and controlling the reaction conditions (e.g. pH, temperature, stirring speed) to improve the purity of lithium carbonate.

Use of ion exchange technology: use specific ion exchange resin to adsorb impurity ions in the solution, thus improving the purity of lithium carbonate.

Use of solvent extraction method: select the appropriate extractant, remove impurities through solvent extraction to improve the purity of lithium carbonate.

Improve the thermal decomposition process: reduce the impurity content of lithium carbonate in the process of thermal decomposition by controlling the temperature, time, atmosphere and other parameters of thermal decomposition.

Adopt membrane separation technology: use membrane separation technology to remove impurities in the solution and improve the purity of lithium carbonate.

Multiple recrystallization: selectively precipitate high purity lithium carbonate through multiple recrystallization process.

Adoption of electrochemical lithium extraction technology: extract lithium ions from lithium-containing solution through electrochemical methods to improve the purity of lithium carbonate.

Recovery of lithium from waste lithium batteries: Recover lithium resources from waste lithium batteries through wet or dry metallurgical technology, and prepare battery-grade lithium carbonate through purification process.

Adopt continuous production process: realize continuous production of lithium carbonate through optimization and improvement of production process, improve production efficiency and product quality.

Strengthening process control and quality testing: strengthening quality control and testing during the entire production process to ensure stable and improved product quality.

Through the combined use of the above methods, the purity of battery-grade lithium carbonate can be well improved to meet the demand for high-purity lithium carbonate in the production of lithium-ion batteries.