Composite electrolyte membrane, preparation method thereof and all solid-state lithium battery having same

A composite electrolyte membrane and lithium salt technology, applied in the field of lithium batteries, can solve the problems of complex preparation methods, difficult processing, and low room temperature conductivity, and achieve high room temperature conductivity, good thermal stability, and good mechanical properties.

Inactive Publication Date: 2017-11-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors found that although the solid electrolyte membrane used in the current all-solid-state lithium battery can solve the potential safety hazards of liquid organic electrolytes, it still generally has low room temperature conductivity, unstable cycle performance, complicated preparation methods, and difficult processing. , Not conducive to industrial production and other issues

Method used

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  • Composite electrolyte membrane, preparation method thereof and all solid-state lithium battery having same
  • Composite electrolyte membrane, preparation method thereof and all solid-state lithium battery having same
  • Composite electrolyte membrane, preparation method thereof and all solid-state lithium battery having same

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Embodiment 1: Preparation of composite electrolyte membrane

[0056] PVDF and LiClO with an average molecular weight of 400,000 4 Dissolved in DMF solvent, stirred for 12h to obtain a mixed solution. Among them, LiClO 4 Accounted for PVDF and LiClO 4 25wt% of the total mass, the concentration of PVDF in the solution is 10wt%. Then, to PVDF and LiClO 4 Li was added to the mixed solution 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , mixed thoroughly to form a slurry. Li 6.75 La 3 Zr 1.75Ta 0.25 o 12 account for Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 10wt% of the total mass of PVDF. Subsequently, the slurry was doctor-bladed onto a glass slide to form a wet film. The wet film was vacuum-dried at 60°C for 24 hours and then taken out to obtain a composite electrolyte membrane.

[0057] Such as figure 2 Shown is the physical picture of the composite electrolyte membrane prepared in Example 1. The composite electrolyte membrane has good mechanical properties, easy proce...

Embodiment 2

[0058] Example 2 Preparation of Composite Electrolyte Membrane

[0059] PAN and LiClO with an average molecular weight of 300,000 4 Dissolved in DMF solvent, stirred for 12h to obtain a mixed solution. Among them, LiClO 4 Accounted for PVDF and LiClO 4 25wt% of the total mass, the concentration of PAN in the solution is 10wt%. Then, to PAN and LiClO 4 Li was added to the mixed solution 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , mixed thoroughly to form a slurry. Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 account for Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 20wt% of the total mass of PAN. Subsequently, the slurry was doctor-bladed onto a glass slide to form a wet film. The wet film was vacuum-dried at 60°C for 24 hours and then taken out to obtain a composite electrolyte membrane. The obtained composite electrolyte membrane was heat-pressed at 110 degrees Celsius for half an hour. A composite electrolyte membrane is further obtained.

Embodiment 3

[0060] Embodiment 3: Preparation of composite electrolyte membrane

[0061] PVDF and LiPF with an average molecular weight of 400,000 6 Dissolved in DMF solvent, stirred for 12h to obtain a mixed solution. Among them, LiPF 6 Accounted for PVDF and LiPF 6 25wt% of the total mass, the concentration of PVDF in the solution is 10wt%. Then, to PVDF and LiPF 6 Li was added to the mixed solution 7 La 3 Zr 2 o 12 , mixed thoroughly to form a slurry. Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 account for Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 10wt% of the total mass of PVDF. Subsequently, the slurry was doctor-bladed onto a glass slide to form a wet film. The wet film was vacuum-dried at 60°C for 24 hours and then taken out to obtain a composite electrolyte membrane.

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Abstract

The invention discloses a composite electrolyte membrane, a preparation method thereof and an all solid-state lithium battery having the same. The composite electrolyte membrane comprises a base body which comprises at least one of PVDF and PAN; lithium salts; and a lithium-lanthanum-zirconium oxygen base oxide. Therefore, the composite electrolyte membrane is high in room-temperature conductivity, steady in electrochemical performance, good in thermal stability, good in mechanical property, easy to process and simple to prepare; the cost is reduced; and the composite electrolyte membrane is beneficial to industrial production.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a composite electrolyte membrane, a preparation method thereof and an all-solid lithium battery containing the membrane. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, large specific capacity, and low pollution, so they are widely used in electronic products and electric vehicles. Lithium-ion batteries commonly used in the market currently use liquid organic electrolytes as their electrolytes. Liquid organic electrolytes may cause problems such as leakage, flammability, and explosion, which may cause safety hazards in the use of lithium-ion batteries. Due to their unique physical, chemical, and electrochemical properties, solid electrolytes can largely eliminate safety accidents such as short circuits and explosions. Solid electrolytes generally have good thermal stability, electrochemical stability, and machinability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0562
CPCH01M10/052H01M10/0562Y02E60/10
Inventor 南策文张雪沈洋
Owner TSINGHUA UNIV
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