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Organic/inorganic composite solid-state electrolyte based on quasi-one-dimensional oxide and its application

A solid electrolyte, inorganic composite technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of inability to fully enhance ionic conductivity, reduce the mechanical properties of electrolyte membranes, and affect the safety of lithium-ion batteries, and achieve good results. The effect of rate and cycle performance, low cost, and easy large-scale production

Active Publication Date: 2020-09-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a large amount of inorganic fillers, the potential window of the electrolyte is significantly widened, and the ionic conductivity at room temperature is enhanced, but the mechanical properties of the electrolyte membrane are greatly reduced due to the addition of a large amount of inorganic fillers, and the lithium dendrites generated at the negative electrode can easily penetrate the electrolyte, affecting Safety of lithium-ion batteries
At the same time, randomly oriented, discontinuously distributed heterogeneous interfaces in composite solid electrolytes prepared from conventional powder-type fillers cannot fully play the role of enhancing ionic conductivity.

Method used

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  • Organic/inorganic composite solid-state electrolyte based on quasi-one-dimensional oxide and its application
  • Organic/inorganic composite solid-state electrolyte based on quasi-one-dimensional oxide and its application
  • Organic/inorganic composite solid-state electrolyte based on quasi-one-dimensional oxide and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 3g of polypropylene carbonate, 0.3g of lithium bistrifluoromethanesulfonimide, and 0.3g of rod-shaped titanium dioxide with a diameter of about 120nm and a length of 10 to 20um to 20g of N-methylpyrrolidone in sequence, and stir for 24 hour to uniform;

[0030] (2) The carrier is a stainless steel plate, and the above solution is formed into a film by scraping, and the wet film thickness is 150um;

[0031] (3) After the wet film was naturally dried for 30 minutes, it was transferred to a vacuum drying oven and dried at 100°C for 24 hours to obtain a composite electrolyte membrane with a thickness of 60±3um.

[0032] figure 1 It is the SEM photo of the rod-shaped titanium oxide filler used. It can be seen that the quasi-one-dimensional structure is very obvious, with a diameter of about 120nm and a length of 10-20um. Depend on figure 2 , 3 The scanning electron microscope photos of the composite electrolyte membrane show that the surface of the composite elec...

Embodiment 2

[0034] (1) Add 3g of polybutylene carbonate, 0.15g of lithium bistrifluoromethanesulfonimide, and 0.9g of fibrous alumina with a diameter of about 500nm and a length of 150 to 180um into 30g of acetone, and stir for 24 hour to uniform;

[0035] (2) The carrier is a polytetrafluoroethylene plate, and the above solution is sprayed to form a film, and the wet film thickness is 300um;

[0036] (3) After the wet film was naturally dried for 30 minutes, it was transferred to a vacuum drying oven and dried at 100°C for 24 hours to obtain a composite electrolyte membrane with a thickness of 165±3um.

[0037] The fibrous alumina filler used in this example has a diameter of about 500nm and a length of 150-180um. The surface of the formed composite electrolyte membrane is very smooth and uniform, the cross-sectional structure is dense, the potential window reaches 4.0V, and the ion conductivity is 1.6×10 -4 S / cm, the tensile strength is 5MPa as measured by a universal testing machine. ...

Embodiment 3

[0039] (1) Add 10g of polyvinyl carbonate, 3g of lithium perchlorate, and 1g of rod-shaped silica with a diameter of about 80nm and a length of 5-8um to 10g of N-N dimethylformamide in sequence, and stir for 24 hours until uniform;

[0040] (2) The carrier is a silica gel plate, and the above solution is formed into a film by roller coating, and the wet film thickness is 100 um.

[0041](3) After the wet film was naturally dried for 30 minutes, it was transferred to a vacuum drying oven and dried at 100°C for 24 hours to obtain a composite electrolyte membrane with a thickness of 52±2um.

[0042] The diameter of the rod-shaped silica filler used in this example is about 80nm, and the length is 5-8um. The surface of the formed composite electrolyte membrane is very smooth and uniform, the cross-sectional structure is dense, the potential window reaches 4.5V, and the ion conductivity is 4.6×10 -4 S / cm, the tensile strength is 17MPa as measured by a universal testing machine. Th...

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Abstract

The invention belongs to the technical field of solid-state batteries and particularly relates to organic / inorganic composite solid-state electrolyte based on quasi-one-dimensional oxides and an application. The organic / inorganic composite solid-state electrolyte membrane is prepared by adopting titanium dioxide, aluminium oxide, silicon oxide and mullite fiber with submicron diameters or titaniumoxide, aluminium oxide and silicon oxide bar with the nanoscale diameter as fillers and adopting a knife-coating, spraying or roller-coating mode for polycarbonate polymers and lithium salts. The organic / inorganic composite solid-state electrolyte is characterized in that the voltage window is 4-5V, the room-temperature ionic conductivity is 10-4-10-3S / cm, and the tensile strength is 5MPa-20MPa.The organic / inorganic composite solid-state electrolyte can be applied to room-temperature high-voltage solid-state lithium ion batteries and displays good cycling performance.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to an organic / inorganic composite solid-state electrolyte based on a quasi-one-dimensional oxide and its application. Background technique [0002] Since the traditional liquid electrolyte uses electrolyte lithium salts containing organic solvents, the assembled lithium-ion secondary batteries are prone to a series of potential dangers such as electrolyte leakage, short circuit and explosion under high temperature and long-term use conditions. It has always been the focus of consumers and professionals. The use of solid electrolytes instead of liquid electrolytes is expected to fundamentally solve the problem of lithium-ion battery safety. [0003] The structure of an all-solid-state lithium-ion battery includes a positive electrode, an electrolyte, and a negative electrode, all of which are composed of solid materials. Among them, solid electrolyte is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0065Y02E60/10
Inventor 华松景茂祥陈浩杨华沈湘黔
Owner JIANGSU UNIV
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