SOLID LITHIUM-CONDUCTING ELECTROLYTE AND METHOD FOR ITS PRODUCTION Russian patent published in 1999 - IPC

FIELD: solid-body polymer ion conductors for lithium rechargeable storage batteries, electrical chemistry equipment and sensors. SUBSTANCE: device has polymer array which is made using polyacrylonitrile and inorganic ionogenic lithium salt. In addition its polymer array contains either copolymer of acrylonitrile and butadiene with average mole weight of 100,000-500,000 with at least 35 weight percents of acrylonitrile groups, or mix of copolymer of acrylonitrile and butadiene with average mole weight of 1100-500,000 with at least 35 weight percents of acrylonitrile groups, and copolymer of polyacrylonitrile with average mole weight of 10,000-600,000 which copolymer components contain either acrylate or methacrylate groups and carbon acid groups. Composition in terms of mole weight is as follows: 77.78-71.43 of copolymer of acrylonitrile and butadiene, 22.22-28.57 of inorganic lithium salt. Corresponding method for production of solid lithium-conducting electrolyte involves separate dissolving of polymer and inorganic lithium salt in organic solvent, deposition of solutions onto Teflon substrate and staged thermal processing. To achieve this method involves deposition of polymer solution onto substrate and its drying in dry nitrogen or noble gas flow under normal pressure and room temperature until film is produced. Then solution of lithium salt in acetonitrile is deposited onto the film for subsequent drying in dry nitrogen or noble gas flow under normal pressure and room temperature. Then procedure is finished by heat processing under temperature of 25-50 C in dry nitrogen or noble gas environment under normal pressure. EFFECT: simplified manufacturing process (in contrast to 350 hours under state-of-the-art method) without vacuum usage, while operation characteristics are kept at high level. 2 cl, 1 tbl