Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient t...Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient temperature and negative charge number of the added salts. Results show that anions can be partly immobilized by increasing their negative charges at lower temperature. Against discharge time the short circuit current of the battery （Li/complex film/Li<sub>x</sub> V<sub>3</sub>O<sub>8</sub>） is stabilized by increasing the anionic charge number of the complex.展开更多
This paper reports the synthesis of methoxyoligo （oxyethylene） methacrylate （MEO<sub>n</sub> , n is the repeating unit number of （CH<sub>2</sub>CH<sub>2</sub>O） in the macromon...This paper reports the synthesis of methoxyoligo （oxyethylene） methacrylate （MEO<sub>n</sub> , n is the repeating unit number of （CH<sub>2</sub>CH<sub>2</sub>O） in the macromonomer）, and its polymerization in different solvents. MEO<sub>n</sub> is prepared through such two independent reactions as （1） anionic polymerization of oxirane initiated by potassium alkoxide and （2） end-capping of methoxy oligo（oxyethylene） by methacrylic group. The n value can be conveniently controlled over the range of 5 ～30 by varying the molar ratio of oxirane to initiator and the molecular weight distribution of MEO<sub>n</sub> be narrowed by increasing reaction time only in step （1）. MEO<sub>n</sub> thus obtained shows a rapid polymerization in water and benzene respectively, and both give water-soluble polymers as long as suitable conditions are used.展开更多
Crosslinked copolymers with single Li<sup>+</sup>-ionic conductivity were prepared from oligo （oxyethylene） methacrylate （MEO<sub>n</sub>）, methacryloyl alkylsulfonic acid lithium （SAMLi）...Crosslinked copolymers with single Li<sup>+</sup>-ionic conductivity were prepared from oligo （oxyethylene） methacrylate （MEO<sub>n</sub>）, methacryloyl alkylsulfonic acid lithium （SAMLi）, and oligo （oxyethylene） dimethacrylate （DMEO<sub>n</sub>）. Li<sup>+</sup>-ionic conductivity of the copolymer is improved by crosslinking and presented as a function of polymerization degree （n） in MEO<sub>n</sub>, comonomeric salt concentration （O/Li）, and crosslinking degree. The crosslinked copolymer P (0.7 MEO<sub>14</sub>-0.3DMEO<sub>14</sub>-SHMLi) without other small molecular additives exhibits an optimum Li<sup>+</sup>-ionic conductivity of 1.2×10<sup>-6</sup> S/cm at 25℃. Dc polarization test in the cell composed of Li/copolymer/Li shows a constant dc ionic conductivity which closes gradually to the ac one with decreasing dc polarization potential.展开更多
文摘Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient temperature and negative charge number of the added salts. Results show that anions can be partly immobilized by increasing their negative charges at lower temperature. Against discharge time the short circuit current of the battery （Li/complex film/Li<sub>x</sub> V<sub>3</sub>O<sub>8</sub>） is stabilized by increasing the anionic charge number of the complex.
文摘This paper reports the synthesis of methoxyoligo （oxyethylene） methacrylate （MEO<sub>n</sub> , n is the repeating unit number of （CH<sub>2</sub>CH<sub>2</sub>O） in the macromonomer）, and its polymerization in different solvents. MEO<sub>n</sub> is prepared through such two independent reactions as （1） anionic polymerization of oxirane initiated by potassium alkoxide and （2） end-capping of methoxy oligo（oxyethylene） by methacrylic group. The n value can be conveniently controlled over the range of 5 ～30 by varying the molar ratio of oxirane to initiator and the molecular weight distribution of MEO<sub>n</sub> be narrowed by increasing reaction time only in step （1）. MEO<sub>n</sub> thus obtained shows a rapid polymerization in water and benzene respectively, and both give water-soluble polymers as long as suitable conditions are used.
文摘Crosslinked copolymers with single Li<sup>+</sup>-ionic conductivity were prepared from oligo （oxyethylene） methacrylate （MEO<sub>n</sub>）, methacryloyl alkylsulfonic acid lithium （SAMLi）, and oligo （oxyethylene） dimethacrylate （DMEO<sub>n</sub>）. Li<sup>+</sup>-ionic conductivity of the copolymer is improved by crosslinking and presented as a function of polymerization degree （n） in MEO<sub>n</sub>, comonomeric salt concentration （O/Li）, and crosslinking degree. The crosslinked copolymer P (0.7 MEO<sub>14</sub>-0.3DMEO<sub>14</sub>-SHMLi) without other small molecular additives exhibits an optimum Li<sup>+</sup>-ionic conductivity of 1.2×10<sup>-6</sup> S/cm at 25℃. Dc polarization test in the cell composed of Li/copolymer/Li shows a constant dc ionic conductivity which closes gradually to the ac one with decreasing dc polarization potential.
