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Polymer electrolyte containing lithium imide fluorosulfonate and preparing method of polymer electrolyte

A technology of lithium sulfonimide and polymer is applied in the field of organic polymer functional materials and electrochemistry, which can solve the problems of insufficient mechanical strength and film-forming properties of electrolytes, poor compatibility of electrode materials, and limited application of SPEs, etc. Cycle efficiency and capacity retention, good thermal stability, and the effect of increasing the number of

Inactive Publication Date: 2015-11-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure SPEs based on LiTFSI have poor compatibility with electrode materials (Macromolecules, 1994, 27, 7469; J. Electrochem. Soc., 1995, 142, 2118), which greatly limits the application of this type of SPEs
[0007] In summary, the pure solid polymer electrolytes in the prior art often have problems such as low conductivity at room temperature, insufficient mechanical strength and film-forming performance of the electrolyte, and poor compatibility with electrode materials.

Method used

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  • Polymer electrolyte containing lithium imide fluorosulfonate and preparing method of polymer electrolyte
  • Polymer electrolyte containing lithium imide fluorosulfonate and preparing method of polymer electrolyte
  • Polymer electrolyte containing lithium imide fluorosulfonate and preparing method of polymer electrolyte

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Embodiment 1～6

[0032] Embodiment 1~6 is the preparation of polymer electrolyte

Embodiment 1

[0033] Example 1: Preparation of a blend electrolyte (electrolyte 1) of (fluorosulfonyl)(trifluoromethylsulfonyl)imide lithium (LiFTFSI) and polyacrylonitrile

[0034] Under ultrasonic conditions, 0.5g (2.1mmol) LiFTFSI was added to 5mL of acetone to obtain a colorless homogeneous liquid, and then 2.2g of LiFTFSI with a molecular weight of 4×10 5 gmol -1 Polyacrylonitrile (its structural unit is acrylonitrile, and the molar ratio of this structure to lithium ions is 20:1) was added to 80 mL of acetone to obtain a colorless viscous liquid (viscosity: 4.3 Pa·s). The polymer solution was added to the lithium salt solution, and ultrasonicated for 2 hours to obtain a mixed solution; then, the obtained mixed solution was uniformly coated on the surface of a flat polytetrafluoroethylene plate by a spin coating method; the final The polytetrafluoroethylene plate was vacuum-dried at 50° C. for 48 hours to obtain a thin film (electrolyte 1) with a smooth surface, a thickness of 120 μm ...

Embodiment 2

[0035] Example 2: Preparation of a blended electrolyte (electrolyte 2) of lithium (fluorosulfonyl)(pentafluoroethylsulfonyl)imide (LiFPFSI) and polyoxyethylene

[0036] Under ultrasonic conditions, 0.5g (1.7mmol) LiFPFSI was added to 5mL of acetonitrile to obtain a colorless homogeneous liquid, and then 1.5g of LiFPFSI with a molecular weight of 4×10 5 gmol -1 Polyoxyethylene (its structural unit is oxyethylene, and the molar ratio of this structure to lithium ions is 20:1) was added to 50 mL of acetone to obtain a colorless viscous liquid (viscosity: 9.7 Pa·s). The polymer solution was added to the lithium salt solution, and ultrasonicated for 5 hours to obtain a mixed solution; then, the obtained mixed solution was uniformly coated on the surface of a flat polytetrafluoroethylene plate by a spin coating method; the final The polytetrafluoroethylene plate was vacuum-dried at 50°C for 24 hours to obtain a film with a smooth surface, a thickness of 150 μm and a certain mechani...

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Abstract

The invention discloses a polymer electrolyte containing lithium imide fluorosulfonate and a preparing method of the polymer electrolyte. The polymer electrolyte prepared by the invention has the advantages that the normal-temperature electric conductivity is high; the vitrification temperature and the crystallinity degree are low; the mechanical intensity and the film forming performance are good; the compatibility with electrode materials is good, and the like. The potential application values are realized in the aspects of lithium (ion) batteries, carbon-base supercapacitors, solar batteries and the like.

Description

technical field [0001] The invention belongs to the technical field of organic polymer functional materials and electrochemistry, and relates to a polymer electrolyte and a preparation method thereof. Background technique [0002] Non-aqueous electrolyte is one of the key materials of high specific energy secondary lithium (ion) batteries, and its comprehensive properties (such as chemical and electrochemical stability, safety, etc.) directly affect the performance and safety of batteries. At present, commercial lithium-ion battery electrolytes are mainly composed of liquid organic carbonate, conductive salt (mainly lithium hexafluorophosphate), and necessary functional additives (such as film formers, anti-overshoot additives, flame retardants, lithium hexafluorophosphate stabilizers, etc.) (Chem . Rev., 2004, 104, 4303; J. Power Sources, 2006, 162, 1379). However, the liquid electrolyte system has disadvantages such as easy leakage of solvent, easy volatilization, poor hi...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 周志彬张恒聂进
Owner HUAZHONG UNIV OF SCI & TECH
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