A composite solid electrolyte with high ionic conductivity and a preparation method thereof

A solid electrolyte and ionic conductivity technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problem of low ionic conductivity, achieve the effects of improving ionic conductivity, fast transmission, and reducing room temperature ionic conductivity

Inactive Publication Date: 2019-01-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low ionic conductivity of the current polymer solid electrolyte, to provide a composite solid electrolyte material with vertically arranged inorganic solid electrolytes and a preparation method thereof, the purpose of which is to improve the ionic conductivity of the solid electrolyte and improve the interface problem , laying the foundation for the preparation of all-solid-state batteries

Method used

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  • A composite solid electrolyte with high ionic conductivity and a preparation method thereof
  • A composite solid electrolyte with high ionic conductivity and a preparation method thereof

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Effect test

Embodiment 1

[0029] Step 1: Prepare orderly oriented LLTO inorganic solid electrolyte nanofibers by electrospinning method and perform high-temperature calcination at 600° C. for 3 hours to obtain well-crystallized nanofibers. Compared with randomly oriented nanofibers, ordered oriented nanofibers are more conducive to achieving a high degree of orientation of nanofibers inside the inorganic electrolyte framework, shortening the Li + The path of transport obtains a solid electrolyte with high ionic conductivity. Electrospinning conditions can be adjusted according to different raw materials.

[0030]Step 2: Evenly disperse the inorganic solid electrolyte nanofibers in water, and then arrange the inorganic solid electrolyte fibers in a direction perpendicular to the substrate by freeze casting, and freeze-dry to form an inorganic solid electrolyte framework that is highly oriented at 90° to the substrate 1. A few nanofibers that cannot be vertically aligned form bridges between vertically...

Embodiment 2

[0035] Step 1: Prepare orderly oriented LTAP inorganic solid electrolyte nanofibers by electrospinning method and perform high-temperature calcination at 900° C. for 1 h to obtain well-crystallized nanofibers. Compared with randomly oriented nanofibers, ordered oriented nanofibers are more conducive to achieving a high degree of orientation of nanofibers inside the inorganic electrolyte framework, shortening the Li + The path of transport obtains a solid electrolyte with high ionic conductivity. Electrospinning conditions can be adjusted according to different raw materials.

[0036] Step 2: Evenly disperse the inorganic solid electrolyte nanofibers in water, and then arrange the inorganic solid electrolyte fibers in a direction perpendicular to the substrate by freeze casting, and freeze-dry to form an inorganic solid electrolyte framework that is highly oriented at 90° to the substrate . A few nanofibers that cannot be vertically aligned form bridges between vertically ali...

Embodiment 3

[0041] Step 1: Prepare randomly oriented LISICON inorganic solid electrolyte nanofibers by electrospinning and perform high-temperature calcination at a temperature of 800°C for 2 hours to obtain well-crystallized nanofibers. Electrospinning conditions can be adjusted according to different raw materials.

[0042] Step 2: Evenly disperse the inorganic solid electrolyte nanofibers in water, and then arrange the inorganic solid electrolyte fibers in a direction perpendicular to the substrate by freeze casting, and freeze-dry to form an inorganic solid electrolyte framework that is highly oriented at 90° to the substrate . A few nanofibers that cannot be vertically aligned form bridges between vertically aligned fibers or fiber clusters.

[0043] Step 3: Using tetrahydrofuran as solvent, polycarbonate and LiPF 6 Mix well to prepare a homogeneous solution. Pouring the above prepared solution on the inorganic solid electrolyte framework obtained in step 2, the inorganic solid el...

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Abstract

The invention relates to a composite solid electrolyte with high ionic conductivity and a preparation method thereof, belonging to the technical field of solid electrolyte for lithium ion batteries. The composite solid electrolyte is composed of inorganic solid electrolyte, polymer electrolyte and lithium salt. The mass ratio of inorganic solid electrolyte, polymer electrolyte and lithium salt is0.2-0.8: 0.2-0.8: 0.05-0.5. The invention prepares inorganic solid electrolyte nanofibers by electrostatic spinning, prepares vertically oriented inorganic solid electrolyte skeleton by freeze castingmethod, and pours polymer and lithium salt to form composite solid electrolyte. Nanofibers instead of nanoparticles have obvious advantages in the preparation of intact and uniform inorganic solid electrolyte skeleton and the formation of fast Li + transport pathway, which can significantly improve the room temperature ionic conductivity of the electrolyte, up to 10<-4>S.cm<-1>. By adjusting thesize of nanofibers and freeze-casting conditions to control the skeleton structure, so as to regulate the comprehensive properties of the electrolyte.

Description

technical field [0001] The invention relates to a composite solid electrolyte with high ion conductivity and a preparation method thereof, belonging to the technical field of lithium ion battery solid electrolyte. Background technique [0002] High-performance, safe and economical energy storage methods are the pursuit goals in many fields, and people place their hopes on the rapidly developing secondary lithium-ion batteries and new materials. With the continuous improvement of the safety and high energy density requirements of lithium-ion batteries, people are gradually turning their attention to all-solid-state lithium-ion batteries. Replacing traditional liquid electrolytes with solid electrolytes is the fundamental way to obtain all-solid-state lithium-ion batteries with high energy density, safety and long cycle life. [0003] Polymer solid electrolytes have many advantages such as high safety, mechanical flexibility, viscoelasticity, easy film formation, adjustable s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 王晨燕绍九南文争彭思侃齐新
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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