Currently, developing sorbent materials for the lithium ion. Methods are used in the process are precipitation polymerization and electrospinning for powder and nanofibers respectively. Both methods include crown ethers known for specific metal complexes. Projects are aimed at recovering lithium from geothermal brine, so sorbent materials should be water insoluble. To achieve this crosslinking of an acidic monomer is carried out via reaction with EGDMA for powder material. For the nanofibers, different compositions of polymers are mixed in aqueous or absolute ethanol media and electrospinning is carried out.