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Composite solid electrolyte and preparation method thereof

A solid electrolyte and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of low electrical conductivity and poor mechanical properties of solid electrolytes, and achieve the effects of low cost, low toxicity, and mild preparation conditions

Active Publication Date: 2018-07-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems existing in the above-mentioned prior art, the present invention aims to provide a composite solid electrolyte and a preparation method thereof. Compared with the prior art, the composite solid electrolyte prepared by the present invention has good mechanical properties, high electrical conductivity, and good film-forming properties. Excellent, solves the problems of poor mechanical properties and low conductivity of existing solid electrolytes, and has good application prospects

Method used

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  • Composite solid electrolyte and preparation method thereof
  • Composite solid electrolyte and preparation method thereof
  • Composite solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. A method for preparing a composite solid electrolyte, comprising the steps of:

[0061] (1) Synthesis of polydichlorophosphazene: react 5 g of hexachlorocyclotriphosphazene at 220° C. for 10 h to obtain polydichlorophosphazene;

[0062] (2) Dissolving the polydichlorophosphazene in step (1) in tetrahydrofuran, adding 3 g of sodium ethylate, and reacting at 60° C. for 10 h to obtain polyphosphazene;

[0063] (3) 0.2g polyphosphazene, 0.1gLLZO, 0.01gTi 3 C 2 1. Dissolve 0.05g LiTFSI in acetonitrile, react at room temperature for 5 hours, volatilize acetonitrile at room temperature, and then transfer to a vacuum drying oven to dry at 60°C for 16 hours to obtain a composite solid electrolyte.

[0064] 2. A composite solid electrolyte. In the composite solid electrolyte prepared in this example, the components polyphosphazene, LLZO, Ti 3 C 2 , The weight percentage of LiTFSI is: 20:10:1:5.

[0065] 3. An all-solid-state lithium battery. The composite solid-state elec...

Embodiment 2

[0067] 1. A method for preparing a composite solid electrolyte, comprising the steps of:

[0068] (1) Synthesis of polydichlorophosphazene: react 5 g of hexachlorocyclotriphosphazene at 230°C for 5 hours to obtain polydichlorophosphazene;

[0069] (2) Dissolving the polydichlorophosphazene in step (1) in tetrahydrofuran, adding 3 g of sodium ethoxide, and reacting at 70° C. for 8 hours to obtain polyphosphazene;

[0070] (3) Add 0.2g polyphosphazene, 0.08g LLTO, 0.01g VC, 0.05g LiPF 6 Add acetone, react for 5 hours, volatilize acetonitrile at room temperature, and then transfer to a vacuum oven to dry at 60°C for 12 hours to obtain a composite solid electrolyte.

[0071] 2. A composite solid electrolyte. In the composite solid electrolyte prepared in this example, the components polyphosphazene, LLZO, Ti 3 C 2 , The weight percentage of LiTFSI is: 20:8:1:5.

[0072] 3. An all-solid-state lithium battery. The composite solid-state electrolyte obtained in this embodiment is ...

Embodiment 3

[0074] 1. A method for preparing a composite solid electrolyte, comprising the steps of:

[0075] (1) Synthesis of polydichlorophosphazene: react 5 g of hexachlorocyclotriphosphazene at 200° C. for 20 h to obtain polydichlorophosphazene;

[0076] (2) Dissolving the polydichlorophosphazene in step (1) in tetrahydrofuran, adding 1.5 g of sodium ethoxide and 1.5 g of lithium ethoxide, and reacting at 60° C. for 10 h to obtain polyphosphazene;

[0077] (3) 0.15g polyphosphazene, 0.05g LPS, 0.03g Ti 2 C, 0.08g LiN(CF 3 SO 2 ) 2 Add it into acetonitrile, react for 5 hours, volatilize the acetonitrile at room temperature, and then transfer to a vacuum oven to dry at 80°C for 10 hours to obtain a composite solid electrolyte.

[0078] 2. A composite solid electrolyte. In the composite solid electrolyte prepared in this example, the components polyphosphazene, LLZO, Ti 3 C 2 , The weight percentage of LiTFSI is: 15:5:3:8.

[0079] 3. An all-solid-state lithium battery. The compos...

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Abstract

The invention relates to composite solid electrolyte and a preparation method thereof. The composite solid electrolyte is prepared from the following components: inorganic solid electrolyte, polyphosphazene electrolyte, inorganic small molecules and lithium salt. The preparation method comprises the following steps: (1) dissolving the inorganic solid electrolyte, the polyphosphazene electrolyte, the inorganic small molecules and the lithium salt in an organic solvent according to a ratio, and pouring into a polytetrafluoroethylene mold, thus obtaining a uniform mixture; and (2) removing the solvent in the mixture in step (1) in a volatilization manner at the room temperature, drying, or directly removing the solvent in the mixture in the step (1) in a drying manner, thus obtaining the composite solid electrolyte. Compared with the prior art, the composite solid electrolyte prepared by the method is good in mechanical performance, high in electric conductivity, excellent in film formingperformance, capable of solving the problems that the existing solid electrolyte is poor in mechanical performance and low in electric conductivity, and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite solid electrolyte and a preparation method thereof. Background technique [0002] The advancement of science and technology has promoted the rapid development of lithium batteries that provide electrical energy for daily electronic products. However, lithium batteries have serious safety hazards caused by the leakage, combustion and explosion of organic electrolytes during use. Some researchers have prepared solid electrolytes from materials such as ceramics and amorphous glass. This type of electrolyte has the incomparable advantages of liquid electrolytes, and it is very likely to become a technical approach to solve the safety problem of lithium-ion batteries. For example, all-solid-state lithium-ion batteries are compared to Liquid lithium-ion batteries have great advantages in improving battery energy density, widening the operating temp...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/052H01M10/056H01M2300/0065Y02E60/10
Inventor 冯金奎安永灵
Owner SHANDONG UNIV
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