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Composite solid polymer electrolyte for secondary lithium cell and preparing method thereof

An all-solid-state polymer, secondary lithium battery technology, applied in secondary battery parts and other directions, can solve the problems of increasing the reactivity with lithium anode materials, destroying the mechanical properties of electrolytes, reducing battery life, etc., and achieving high electrochemical stability. performance, low cost and high interfacial stability

Inactive Publication Date: 2003-11-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyoxyethylene (PEO) has attracted much attention due to its structural characteristics of easy ion conduction. However, the polymer electrolyte formed by PEO and alkali metal salt has a high crystallization phase at room temperature, and the formed electrolyte can only be used at high temperature. It can only be used under the following conditions, so its practical application is limited
The method commonly used to reduce the crystallinity of PEO is to add an organic liquid plasticizer. Although the addition of a liquid plasticizer improves the ionic conductivity of the polymer electrolyte, it also destroys the mechanical properties of the electrolyte and increases its compatibility with lithium anode materials. reactivity, reducing battery life

Method used

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  • Composite solid polymer electrolyte for secondary lithium cell and preparing method thereof
  • Composite solid polymer electrolyte for secondary lithium cell and preparing method thereof
  • Composite solid polymer electrolyte for secondary lithium cell and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 PEO / LiClO 4 / modified montmorillonite

[0028] The montmorillonite used in this example is calcium-based montmorillonite, and the cation exchange capacity is 40 mmol per 100 grams. Firstly, calcium-based montmorillonite was modified with 1mol / L NaCl and 1mol / L LiCl, washed with deionized water, and dried in vacuum. mont and Li-mont. Part of the lithium-modified montmorillonite was vacuum-dried at 250°C for two days and recorded as 250-Li-mont. Dodecylamine-modified montmorillonite was prepared by adding dodecylamine to acidified sodium-based montmorillonite, and the sample was denoted as Org-mont. All samples were ground and passed through a 300-mesh sieve before use. The preparation of the composite polymer electrolyte membrane uses acetonitrile as a solvent and is prepared by a solution casting method. First, weigh a certain amount of PEO according to n(O) / n(Li)=16 (relative molecular mass is 3×10 5 ) and LiClO 4 , dissolved with acetonitrile, stirred...

Embodiment 2

[0029] Example 2 PEO / LiClO 4 / ZnO in different forms (nano-scale, micro-scale and whiskers)

[0030] Nanoscale ZnO is synthesized by wet chemical method, and its average particle size is 60nm observed by TEM. The preparation of the composite polymer electrolyte membrane uses acetonitrile as a solvent and is prepared by a solution casting method. First, weigh a certain amount of PEO and LiClO according to the molar percentage of O / Li being 16 4 , and then add different mass percentages of n-ZnO (mass percentages account for PEO+LiClO according to n-ZnO 4 Calculate the mass of the powder), mix the powder evenly, dissolve it with acetonitrile, stir it in a conical flask for one day, and finally pour the solution on a tetrafluoro plate, evaporate the solvent, and then dry it in a vacuum oven at 80°C for two days. The thickness of the prepared electrolyte film is about 150 μm. The prepared samples were then tested for ionic conductivity ( Image 6 , Figure 7 ), thermal prope...

Embodiment 3

[0031]Example 3 PEO / LiClO 4 / Silane modified nano-SiO 2

[0032] There are four kinds of silane coupling agents: KH550, KH560, KH570 and KH792. Nanoscale SiO used 2 The powder particle size is about 10 nanometers, and the BET specific surface area is 249m 2 / g. Nanoscale SiO 2 Modification method: first dissolve a certain amount of silane coupling agent in alcohol, then add nano-scale SiO 2 , then stirred at room temperature for 24 hours, then stood still for 24 hours, filtered and then washed with alcohol to remove the silane coupling agent on the surface, and dried at 80°C for later use. The preparation of the composite polymer electrolyte membrane uses acetonitrile as a solvent and is prepared by a solution casting method. First, the modified SiO was dispersed by ultrasonic dispersion 2 Disperse in acetonitrile, then weigh a certain amount of PEO and LiClO according to the molar percentage of O / Li being 16 4 , Stir in the Erlenmeyer flask for one day, and finally p...

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Abstract

The present invention discloses a compounded full-solid polymer electrolyte for secondary lithium cell and its preparation method. The described polymer electrolyte contains 2%-30% of inorganic oxide, and the matching ratio of polyethylene glycol and alkali metal salt O / Li is 8-16. Its preparation method includes: dissolving polyethylene glycol and LiClO4 in acetionitrile, adding inorganic oxide,pouring the mixed solution onto teflon plate, evaporating solvent and drying at 50-100 deg.C in vacuum drying box. The described inorganic oxide also can be modified inorganic oxide. Said prepared material can be extensively used in the fields of handset, domestic appliances and electric car.

Description

technical field [0001] The invention relates to a composite all-solid polymer electrolyte for secondary lithium batteries and a preparation method thereof, in particular to a composite all-solid polymer electrolyte for secondary lithium batteries widely used in mobile phones, household appliances and electric vehicles The invention and a preparation method thereof belong to the technical field of electrolyte preparation and application. Background technique [0002] Polymer electrolytes are especially suitable as electrolyte materials for lithium batteries due to their light weight, good viscoelasticity, and good film-forming properties. Polyoxyethylene (PEO) has attracted much attention due to its structural characteristics of easy ion conduction. However, the polymer electrolyte formed by PEO and alkali metal salt has a high crystallization phase at room temperature, and the formed electrolyte can only be used at high temperature. It can only be used under the environment...

Claims

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Application Information

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IPC IPC(8): C08L63/00H01M10/02
CPCY02E60/10
Inventor 南策文范丽珍
Owner TSINGHUA UNIV
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