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Self-crosslinkingcomb-shaped polymer and lithium-ionsolid polymerelectrolyte

A comb-like polymer, solid electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of difficult adjustment, difference in affinity, low PEO content, etc., and achieve the effect of good mechanical strength

Active Publication Date: 2015-04-01
BEIJING DANGDAIJINGDIAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Predecessors have also done a lot of research in this area: For example, the solid electrolyte substrate selected in patents CN 103208651A and CN 103421190A is a comb-shaped siloxane-based polymer, but this kind of solid electrolyte is difficult to adjust due to its low PEO content. The ionic conductivity is lower than 10-4S / cm
In addition, the system itself does not have cross-linkability, and its cross-linking must be achieved by adding a cross-linking agent
Due to the difference in affinity between these crosslinking agents and the matrix resin, the dispersion and selectivity of the crosslinking agent in the matrix resin will change, thus increasing the complexity of the preparation.

Method used

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Experimental program
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Effect test

Embodiment 1

[0027]The molar ratio of cyclooctene and cyclooctene macromonomer whose branch chain is PEG is 1:2, and the solid electrolyte is obtained by ring-opening metathesis polymerization. The bridging agent used is toluene-2,4-diisocyanate, and PEG is selected The molecular weight is 350g / mol, and the PEG content is 50wt%. The lithium salt is lithium perchlorate LiClO 4 , [Li] / [EO]=1:20. The room temperature (25°C) conductivity of the solid electrolyte thus obtained can reach 8.48×10 -5 S / cm, the strength can reach 7.9MPa.

Embodiment 2

[0029] The molar ratio of cyclooctene and cyclooctene macromonomer whose branch chain is PEG is 2:1, and the solid electrolyte is obtained by ring-opening metathesis polymerization, and the bridging agent used is 1,6-hexylene isocyanate trimer, The selected PEG molecular weight is 350g / mol, and the PEG content is 40wt%. Lithium salt chooses LiPF 6 , [Li] / [EO]=1:12. The room temperature (25°C) conductivity of the solid electrolyte thus obtained can reach 2.53×10 -4 S / cm, the strength can reach 8.9MPa.

Embodiment 3

[0031] The molar ratio of cyclooctene and cyclooctene macromonomer whose branch chain is PEG is 2.7:1, and the solid electrolyte is obtained by ring-opening metathesis polymerization. The bridging agent used is toluene-2,4-diisocyanate, and PEG is selected The molecular weight is 350g / mol, and the PEG content is 30wt%. The lithium salt is LiN(CF 3 SO 2 ) 2 ,[Li] / [EO]=1:6. The room temperature (25°C) conductivity of the solid electrolyte thus obtained can reach 5.36×10 -5 S / cm, the strength can reach 9.7MPa.

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Abstract

The invention relates to a solidelectrolyte which has the self-crosslinking property and adopts a controllable structure. Acomb-shaped polymer with a main chain adopting a self-crosslinkingpolyolefinstructure and a side chain of PEG (polyethylene glycol) is used as the solidelectrolyte for ion transport, the excellent electrochemical performance is acquired, and meanwhile, a material is ensured to have good molding machinability and high mechanical strength.

Description

technical field [0001] The invention relates to a comb polymer and a lithium ion solid polymer electrolyte. Background technique [0002] Lithium-ion batteries are widely used as power sources for notebook computers, digital cameras, mobile phones, etc. because of their high energy density and long cycle life. Traditional lithium-ion batteries are all liquid batteries or gel batteries, in which small molecules of carbonate liquid are used to transport lithium ions. This type of liquid electrolyte is easy to volatilize at high temperature, causing the battery to bloat or even explode. Huge security risk. The way to completely solve this problem is undoubtedly to replace the liquid lithium-ion electrolyte with an all-solid lithium-ion electrolyte. But to have practical performance, solid lithium ion electrolyte must have high conductivity (higher than 10 at room temperature -4 S / cm, lithium ion migration number>5), high mechanical strength (>5MPa) and wide electrochem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/08C08F232/04H01M10/0565
CPCY02E60/10
Inventor 施德安林蝶吴京张新立
Owner BEIJING DANGDAIJINGDIAN TECH CO LTD
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