Inorganic/organic polymer composite solid electrolyte film and preparation method thereof

A solid electrolyte and polymer technology, applied in the field of lithium-ion batteries, can solve the problems of difficult processing of electrolyte films, difficulty in resisting lithium dendrite growth, low conductivity, etc., and achieve spatial network structure stability, electrochemical and interface stability Good, the effect of improving ionic conductivity

Active Publication Date: 2018-07-27
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Organic polymer electrolytes are light in weight, good in strength and elasticity, easy to form films, good in electrochemical and chemical stability, and high in lithium ion migration number. However, they are generally filled with metal oxides such as silicon dioxide and aluminum oxide, which require additional lithium Salt electrolyte, low conductivity at low temperature, strong fluidity at high temperature, difficult to resist the growth of lithium dendrites
Inorganic solid-state electrolytes are generally lithium salts with good mechanical properties, and the assembled full battery has higher energy and power density, but it is difficult to be processed into an electrolyte film that can be used in lithium-ion batteries

Method used

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  • Inorganic/organic polymer composite solid electrolyte film and preparation method thereof
  • Inorganic/organic polymer composite solid electrolyte film and preparation method thereof
  • Inorganic/organic polymer composite solid electrolyte film and preparation method thereof

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[0026] The invention provides a method for preparing an inorganic / organic polymer composite solid electrolyte film, comprising the following preparation steps:

[0027] After mixing the raw materials, casting and drying in sequence to obtain an inorganic / organic polymer composite solid electrolyte film, the raw materials include an inorganic solid electrolyte, a polymer matrix and an organic solvent;

[0028] The inorganic solid electrolyte has a chemical composition shown in formula I: Li 1+x al x Ti 2-x (PO 4 ) 3 Formula I, 0.1≤x≤0.5;

[0029] The mass of the inorganic solid electrolyte is 5% to 15% of the mass of the polymer matrix;

[0030] The mass of the organic solvent is 60-90% of the mass of the polymer matrix.

[0031] In the present invention, the amount of the inorganic solid electrolyte is preferably 10% to 13% of the mass of the polymer matrix.

[0032] The inorganic solid electrolyte is preferably Li 1.2 al 0.2 Ti 1.8 (PO 4 ) 3 , Li 1.3 al 0.3 Ti ...

Embodiment 1

[0058] Weigh 0.6545g LiOH·H 2 O was first dissolved in deionized water, and then 0.1529 g Al was weighed 2 o 3 , 1.3578gTiO 2 and 2.94g H 3 PO 4 Add to the above solution and stir magnetically. The mixture was heated to 120°C to remove excess water until a viscous paste formed. Calcined at 850°C for 4h at a heating rate of 2°C / min in a muffle furnace, and cooled naturally to obtain the inorganic solid electrolyte Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , referred to as LATP. The obtained LATP was wet-milled in an agate ball mill jar at a speed of 500r / min for 10h, and dried at 100°C to obtain LATP powder. The scanning electron microscope picture of the powder is as follows: figure 1 shown.

[0059] Weigh 0.025g of the above-prepared LATP powder and add it to 4.5g DMF and stir at room temperature for 48h, then add 0.5g of vinylidene fluoride-hexafluoropropylene copolymer and magnetically stir at 50°C for 2h to form a homogeneous polymer solution without adding DBP . Spread...

Embodiment 2

[0061] LATP powder was prepared as described in Example 1.

[0062] Weigh 0.025 g of LATP powder prepared under the above conditions and add it to 4.5 g DMF, stir at room temperature for 48 h, then add 0.5 g of vinylidene fluoride-hexafluoropropylene copolymer and magnetically stir for 2 h at 50° C. to form a homogeneous mixture. Then 0.75g DBP was added and stirring was continued for 1.5h to form a homogeneous polymer solution. Spread the obtained polymer mixture on a clean glass slide to form a film, transfer it to a vacuum drying oven at 50°C for 24 hours, soak it in alcohol to remove the DBP plasticizer, and then dry it in vacuum at 60°C for 12 hours to obtain an inorganic / organic Composite polymer electrolyte membrane, (the SEM image of composite polymer electrolyte is shown in figure 2 As shown, the surface of the electrolyte is evenly distributed, and there are certain pores that are conducive to the transport of Li+. XRD picture as shown image 3 As shown, the diff...

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Abstract

The invention provides an inorganic / organic polymer composite solid electrolyte film and a preparation method thereof and belongs to the technical field of lithium ion batteries. The inorganic / organicpolymer composite solid electrolyte film is prepared by: mixing inorganic solid electrode, polymer matrix and an organic solvent, and carrying out film casting and drying in sequence. The inorganic / organic polymer composite solid electrolyte film has the advantages of both solid electrode and liquid electrode, has no need for electrolytes with added lithium salts, and is suitable for film casting.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an inorganic / organic polymer composite electrolyte film and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries generally use traditional liquid electrolytes. Liquid electrolytes have high room temperature ionic conductivity, but they are difficult to process and seal. During use, the packaging is easily damaged, the electrolyte reacts with the electrode material, and it is easy to overcharge and generate electricity. Lithium dendrites, etc., lead to safety problems related to leakage, explosion and internal short circuit (Recent advances in all-solid-state rechargeable lithium batteries. Sun, C., et al., NanoEnergy, 2017.33: p.363-386. ). When the external temperature of the battery rises, the internal temperature of the battery rises easily when the battery is charged and discharged with a large current, or the short circ...

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 雷钢铁史晓娟陈效兰李朝晖肖启振
Owner XIANGTAN UNIV
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