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All-solid-state composite polymer electrolyte and preparation method thereof

A solid polymer and polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of unsatisfactory practicality and poor mechanical strength, and achieve good mechanical properties, reasonable structure ratio, and high conductivity Effect

Inactive Publication Date: 2017-02-15
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical strength of the electrolytes currently formed by combining hyperbranched polymers and star polymers with lithium salts is poor, which cannot meet the requirements of practical applications.

Method used

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  • All-solid-state composite polymer electrolyte and preparation method thereof
  • All-solid-state composite polymer electrolyte and preparation method thereof
  • All-solid-state composite polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see figure 1 , 2 , 5 Dry the lithium salt in a vacuum oven at 80°C for 24 hours, weigh HBPS-(PMMA- b -PEGMA) 30(hyperbranched polystyrene is the core, methyl methacrylate-polyethylene glycol methacrylate block copolymer is the hyperbranched star polymer of the arm) 0.1g, two trifluoromethanesulfonimide lithium ( LiTFSI) 0.011g, methylimidazole tetrafluoroborate (MeImBF 4 ) 0.03g of ionic liquid, add 5ml of tetrahydrofuran solution and stir vigorously to a homogeneous solution, pour the solution into a polytetrafluoroethylene abrasive tool, evaporate the solvent at room temperature for 3h, and then place it at 60°C for 6h to obtain a polymer electrolyte. The glass transition temperature of the prepared polymer electrolyte is -57.43 ℃, and the room temperature conductivity of the polymer electrolyte is 1.99×10 -4 S / cm.

Embodiment 2

[0049] see figure 1 , 2 , 5, dry lithium salt in 80 ℃ vacuum oven for 24 hours, weigh HBPS-(PMMA- b -PEGMA) 30 (hyperbranched polystyrene is the core, methyl methacrylate-polyethylene glycol methacrylate block copolymer is the hyperbranched star polymer of the arm) 0.1g, two trifluoromethanesulfonimide lithium ( LiTFSI) 0.011g, 1-butyl-3-methylimidazole hexafluorophosphate (MeImPF 6 ) 0.03g of ionic liquid, add 5ml of tetrahydrofuran solution and stir vigorously to a homogeneous solution, pour the solution into a polytetrafluoroethylene abrasive tool, evaporate the solvent at room temperature for 3h, and then place it at 60°C for 6h to obtain a polymer electrolyte. The glass transition temperature of the prepared polymer electrolyte is -65.85 ℃, and the room temperature conductivity of the polymer electrolyte is 4.13×10 -5 S / cm.

Embodiment 3

[0051] Dry the lithium salt in a vacuum oven at 80 °C for 24 hours, weigh HBPS-(PMMA- b -PEGMA) 30 (hyperbranched polystyrene is the core, methyl methacrylate-polyethylene glycol methacrylate block copolymer is the hyperbranched star polymer of the arm) 0.1g, two trifluoromethanesulfonimide lithium ( LiTFSI) 0.011g, nano silicon dioxide 0.001g, add 5ml tetrahydrofuran solution and stir vigorously to a homogeneous solution, pour the solution into a polytetrafluoroethylene abrasive tool, evaporate the solvent at room temperature for 3h, and then place it at 60°C for 6h in vacuum to obtain polymer electrolyte. The glass transition temperature of the prepared polymer electrolyte is -48.69 ℃, and the room temperature conductivity of the polymer electrolyte is 2.53×10 -5 S / cm.

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Abstract

The invention discloses an all-solid-state composite polymer electrolyte and a preparation method thereof. An adopted polymer matrix is a hyperbranched polymer or a star-like polymer. Different types of lithium salt are added into the polymers, and are compounded with substances such as inorganic fillers (such as nanoparticles, nanofibers), ionic liquid, carbonic ester compounds as well as other linear or branched polymers (such as polyether, polydioxolane, polycaprolactone, polyphosphazene, polyurethane, Makrolon, polyamide, polyimide, polyester, polyvinylidene fluoride, polytetrafluoroethylene, polyhexafluoropropylene or corresponding segmented copolymers or graft polymers thereof and the like) respectively, a film can be formed through a solution pouring process, the all-solid-state composite polymer electrolyte is prepared, and the room-temperature conductivity of the electrolyte is approximate to 10<-4> S / cm. The solid electrolyte has potential applications in electrochemical devices such as secondary lithium ion batteries, supercapacitors, electronic sensors, electrochromic devices and the like.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte materials, and in particular relates to an all-solid composite polymer electrolyte and a preparation method thereof. Background technique [0002] As an important energy storage device in this century, lithium-ion batteries have a wide range of applications, such as mobile portable communication equipment, electric power devices, and large-scale photovoltaic lithium-ion power stations. However, most of the commercialized secondary lithium-ion batteries use organic liquid electrolytes, which are easy to leak and volatile, which greatly affects the service life of lithium-ion batteries and brings great safety hazards, such as Most of the explosions of mobile phones and other electronic products are directly related to the leakage of batteries. Compared with traditional organic liquid electrolytes, all-solid polymer electrolyte materials have higher energy density, strong shape design capabilities...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 张辽云王蔼廉郑涛许浩李化毅胡友良
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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