Patent TW-342406-B (TW)
Title: Polymeric solid electrolyte the invention relates to a polymer solid electrolyte, particularly to a polymer electrolyte composition for an LPB-type electrochemical generator.
Inventor: KAWANO MICHIYUKI
IPC: H01M6/18
Filed: 1995-03-17
Granted: 1998-10-11
Abstract: A polymer electrolyte composition for LPB electrochemical generators, the generators comprising positive and negative electrodes, and an electrolyte, the electrolyte having a polymer matrix which comprises a mixture of at least one polymer of type (a) and at least one compound of type (b) and optionally a plasticizer, the polymer of type (a) having a molecular weight higher than about 25,000, and being selected from homopolymers consisted of the following (I) or (ii) or (iii), the polymer of type (a) also being able to dissolve lithium salts, having at least two cross-linkable functions, and being capable of adhering on the electrodes, (I) a random polyether copolymer of ethylene oxide and a comonomer selected from the group consisting of a substituted ether oxide of the formula, (formula) in which R is Ra, in which Ra is alkyl, alkenyl, or alkylnyl having 1 to 12 carbon atoms or --CH2 --O--Re--Ra in which Ra is as defined above, Re is a polyether of the formula --(CH2 --CH2 --O)p, in which p is an integer from 0 to 10 and a cyclic ether having a ring containing more than 3 carbon atoms selected from the group comprising tetrahydrofurane, dioxolane and functional derivatives thereof, in which cross-linking is obtained by reaction of the cross-linkable functions with a cross-linking agent, (ii) a macromolecular material of cross-linked polymers or oligomers containing heteroatoms in the monomer unit or in side chains and at least two cross-linkable functions, in which the heteroatoms are selected from nitrogen, oxygen, sulfur and phosphorus, the ratio of the number of carbon atoms to the number of heteroatoms in the polymers or oligomers is between 1 and 12, and the polymers or oligomers are sequenced or grafted random copolymers or sequenced or grafted polycondensates derived from cyclic ethers, formaldehyde, acetaldehyde, aziridines or ethylene diamine, or (iii) an organometallic polymer comprising an organic polymer having at least three hydroxy groups in which a metal is directly connected by means of an oxygen atom to at least two organic polymer chains, in which the organic polymer comprises at least one monomer containing at least one hetero atom capable of forming a donor-acceptor bond with cations of the salts and wherein said metal has at least two carbon-metal bonds, with the metal being chosen from the group consisting of aluminum zinc, and magnesium, in which the organic polymer comprises a monomer moiety of the formula: (formula) in which R1 is hydrogen, Rb, --CH2 --O--Rc--Ra or --CH2 --N(CH3)2, in which Rb is C1-16 alkyl or a C1-16 cycloalkyl, and Rc is a polyether group of the following formula (formula) in which p is an integer with a value of from 1 to 100, in which the organic polymer further comprises a monomer moiety of the formulas (formula) in which R" is Rb or --Rd--Rb, in which R3 and R2 are independently Rc, Rd Rb, Rd -Rb, and in which Rd is a group of the following formula (formula) in which p is as defined above; the compound of type (b) having a molecular weight lower than about 20,000, being chemically compatible with the polymer of type (a), and having at least two cross-linkable functions.