A polymer solid electrolyte based on the principle of bulk plasticization and its preparation method

A solid electrolyte and polymer technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of low ionic conductivity at room temperature, difficult to guarantee compatibility, poor stability, etc. Strong ability, good high temperature mechanical strength effect

Active Publication Date: 2022-04-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The room temperature ionic conductivity of polymer solid electrolytes is low, and the ionic conductivity can be improved by adding plasticizers, but at the expense of the mechanical strength of the electrolyte, and the commonly used small molecule liquid plasticizers are easy to seep out, The stability is poor; high-strength polymers can be added to improve the mechanical strength of the electrolyte, but the compatibility between polymers is also difficult to guarantee 9

Method used

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  • A polymer solid electrolyte based on the principle of bulk plasticization and its preparation method
  • A polymer solid electrolyte based on the principle of bulk plasticization and its preparation method
  • A polymer solid electrolyte based on the principle of bulk plasticization and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of polyether sulfide bulk plasticizer (PSP-1). 1,2-ethanedithiol (EDT, formula I, R: C2) and diethylene glycol divinyl ether (DGDE, formula II (f)) are reactive monomers, vinyl ether (EVE, formula III ( b)) is an end-capping agent, 2,2-dimethoxy-2-phenylacetophenone (DMPA) is a photoinitiator, and anhydrous tetrahydrofuran (THF) is a solvent.

[0040] The following operations were all carried out in an argon atmosphere glove box and were divided into two steps. Step 1: Add EDT and DGDE according to a certain ratio in a 20mL small glass bottle, add an appropriate amount of THF, then add DMPA, stir in the dark to dissolve completely, and trigger the reaction under 365nm ultraviolet light to prepare sulfhydryl-terminated Linear polyether sulfide (ETE-x); the second step: take out part of ETE-x, add the end-capping agent EVE and an appropriate amount of DMPA, stir in the dark to completely dissolve, and initiate the reaction under 365nm ultraviolet l...

Embodiment 2

[0044] Example 2: Preparation of polyether sulfide bulk plasticizer (PSP-2). EDT and DGDE are reactive monomers, propyl cellulose vinyl ether (PFVE, formula III(i)) is an end-capping agent, DMPA is a photoinitiator, and anhydrous THF is a solvent.

[0045] Except that the end-capping agent was changed, the dosage and operation steps of each reagent were the same as in Example 1.

[0046] The code number of the polyether sulfide bulk plasticizer sample is: PSP-2.

Embodiment 3

[0048] Example 3: Preparation of bulk plasticized polymer solid electrolyte (SPE-1): triallylamine (TAA, formula IV (e)) is a crosslinking agent, PSP-1 is a plasticizer, and bistrifluorosulfone Lithium imide (LiTFSI, formula VI(a)) is a small molecule lithium salt, DMPA is used as a photoinitiator, and anhydrous THF is used as a solvent.

[0049] The following operations are all carried out in a glove box. Add ETE-x, TAA, PSP-1, LiTFSI and DMPA to a 20mL small glass bottle according to a certain ratio, add an appropriate amount of THF and stir it in the dark to dissolve completely, and use a spatula to apply it on the BOPP material substrate and irradiated under 365nm ultraviolet light, and the solvent was evaporated at room temperature.

[0050] In the ETE-x, x is preferably 10-20.

[0051] The molar ratio of ETE-x to TAA is 3:2.

[0052] The molar ratio of the EO / ES segment to the lithium salt is: [EO / ES] / Li + =10 / 1.

[0053] The total mass percentage of the PSP-1 in the...

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Abstract

The invention discloses a polymer solid electrolyte based on the principle of bulk plasticization and a preparation method thereof. The bulk plasticized polymer electrolyte is photopolymerized by dithiol and dienyl ether in different proportions to generate linear polyether sulfide polymers with different molecular weights, and a part of the polymer is terminated with monoalkenyl ether as poly Ether sulfide bulk plasticizer; the other part of polymer and polyene crosslinking agent are in-situ cross-linked and polymerized in a mixture of polyether sulfide bulk plasticizer and small molecule lithium salt at a certain ratio. The bulk plasticized polymer solid electrolyte lithium ion conductivity prepared by the present invention is higher (50 o C can reach 10 ‑4 S cm ‑1 ), good mechanical strength (2 Mpa), and can be used as a solid electrolyte membrane, a functional binder for positive electrodes, and an SEI film on the surface of lithium negative electrodes. The bulk plasticized polymer solid electrolyte prepared by the invention has the advantages of simple and rapid synthesis, low raw material cost, high interface compatibility, strong lithium ion conductivity, good mechanical strength, and the like.

Description

technical field [0001] The invention belongs to the field of solid electrolytes, and in particular relates to a polymer solid electrolyte based on bulk plasticization and a preparation method thereof. Background technique [0002] At present, most of the secondary batteries that have been commercialized use the "electrolyte-diaphragm" system. The low-boiling carbonate or ether electrolyte is flammable, explosive and easy to leak, which brings great safety hazards. 1-2 , the application of polymer solid electrolytes is considered to be one of the effective methods to solve the above problems. Polymer solid electrolyte has the advantages of low density, light material, low price, and good flexibility. It can not only be used as a solid electrolyte, but also has been extensively studied in other parts of the battery. 3 . [0003] At present, a lot of research work has been done on polymer electrolytes at home and abroad, including the construction methods of polymer lithium i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 孟跃中钟雷王天羿李志峰肖敏王拴紧韩东梅任山
Owner SUN YAT SEN UNIV
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