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PMMA/LLZN nanofiber composite solid electrolyte membrane as well as preparation and application thereof

A technology of solid electrolytes and nanofibers, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of low conductivity of PMMA-based solid electrolytes and low conductivity of solid electrolytes, and achieve increased electrochemical stability and thermodynamic stability properties, excellent ionic conductivity, and simple preparation method

Active Publication Date: 2019-02-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of PMMA / LLZN nanofiber composite solid electrolyte film and its preparation method and application, to overcome the problem of low conductivity of solid electrolyte in the prior art
[0006] The present invention aims at the problem of low conductivity of the PMMA-based solid electrolyte, and obtains a composite solid electrolyte by compounding LLZN nanofibers, thereby constructing a three-dimensional network ion channel, thereby greatly improving the ionic conductivity of the original PMMA-based solid electrolyte at normal temperature and high temperature

Method used

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  • PMMA/LLZN nanofiber composite solid electrolyte membrane as well as preparation and application thereof
  • PMMA/LLZN nanofiber composite solid electrolyte membrane as well as preparation and application thereof
  • PMMA/LLZN nanofiber composite solid electrolyte membrane as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Weigh respectively 2.56g of vacuum-dried lithium nitrate, 6.50g of vacuum-dried lanthanum nitrate hexahydrate, 3.36g of zirconium n-butoxide and 0.338g of niobium pentachloride according to a certain molar ratio, and place them in a 250mL volumetric flask middle. Weigh 200mL of N,N-dimethylformamide and 50mL of acetic acid in a beaker respectively, add the mixed solution of the two into the volumetric flask, set to volume, and stir magnetically until the solute is completely dissolved. Weigh 20 g of the above-dissolved solution and 3 g of PVP into a 100 mL beaker, and stir magnetically until the PVP is completely dissolved. During the electrospinning process, the voltage was 20kV, the distance from the needle to the receiving plate was 10cm, the advancing speed was 1mL / h, and the spinning time was 20h to obtain the LLZN nanofiber precursor. The LLZN nanofiber precursor was calcined in a muffle furnace at a temperature of 900 °C, a heating rate of 2 °C / min, and a ca...

Embodiment 2

[0047] (1) Weigh respectively 2.68g of vacuum-dried lithium nitrate, 6.50g of vacuum-dried lanthanum nitrate hexahydrate, 3.36g of zirconium n-butoxide and 0.338g of niobium pentachloride according to a certain molar ratio, and place them in a 250mL volumetric flask middle. Weigh 200mL of N,N-dimethylformamide and 50mL of acetic acid in a beaker respectively, add the mixed solution of the two into the volumetric flask, set to volume, and stir magnetically until the solute is completely dissolved. Weigh 20 g of the above-dissolved solution and 2.6 g of PVP into a 100 mL beaker, and stir magnetically until the PVP is completely dissolved. During the electrospinning process, the voltage was 18kV, the distance from the needle to the receiving plate was 12cm, the advancing speed was 0.8mL / h, and the spinning time was 12h to obtain the LLZN nanofiber precursor. The LLZN nanofiber precursor was calcined in a muffle furnace at a temperature of 900 °C, a heating rate of 3 °C / min, and ...

Embodiment 3

[0051] (1) Weigh 2.80 g of vacuum-dried lithium nitrate, 6.50 g of vacuum-dried lanthanum nitrate hexahydrate, 3.36 g of zirconium n-butoxide and 0.338 g of niobium pentachloride according to a certain molar ratio, and place them in a 250 mL volumetric flask middle. Weigh 200mL of N,N-dimethylformamide and 50mL of acetic acid in a beaker respectively, add the mixed solution of the two into the volumetric flask, set to volume, and stir magnetically until the solute is completely dissolved. Weigh 20 g of the above-dissolved solution and 2.4 g of PVP into a 100 mL beaker, and stir magnetically until the PVP is completely dissolved. During the electrospinning process, the voltage was 18kV, the distance from the needle to the receiving plate was 15cm, the advancing speed was 0.5mL / h, and the spinning time was 36h to obtain the LLZN nanofiber precursor. The LLZN nanofiber precursor was calcined in a muffle furnace at a temperature of 800 °C, a heating rate of 5 °C / min, and a calcin...

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Abstract

The invention relates to a PMMA / LLZN nanofiber composite solid electrolyte membrane as well as preparation and application thereof. The membrane comprises polymethyl methacrylate, LLZN nanofiber and lithium perchlorate. A preparation method comprises the following steps: preparing an LLZN nanofiber precursor, preparing the LLZN nanofiber, preparing a mixed solution, and preparing the PMMA / LLZN nanofiber composite solid electrolyte membrane. The membrane has very good flexibility, good ionic conductivity far exceeding that of an uncompounded system and excellent safety performance. The preparation method is simple, the cost is low, and the industrialization is easy.

Description

technical field [0001] The invention belongs to the field of composite solid electrolyte and its preparation and application, in particular to a PMMA / LLZN nanofiber composite solid electrolyte film and its preparation method and application. Background technique [0002] With the rapid emergence of various mobile electronic communication devices, flexible display devices and flexible wearable electronic devices, new and higher requirements are put forward for the corresponding energy storage devices: safety, flexibility, and portability. Lithium-ion batteries, due to their high operating voltage and energy density, low self-discharge rate, and relatively small environmental pollution, have become ideal energy storage carriers. However, the traditional lithium-ion battery itself is rigid, and the electrolyte used is a liquid electrolyte. During the working process, the formation of lithium dendrites will pierce the separator, causing an internal short circuit in the battery, ...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 王宏志孙健其李耀刚张青红侯成义
Owner DONGHUA UNIV
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