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High-wettability sulfide-based composite electrolyte with 'sandwich' structure, and preparation method and application of high-wettability sulfide-based composite electrolyte

A composite electrolyte, high wettability technology, applied in composite electrolytes, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor sulfide interface contact, unstable sulfide electrolyte, low ionic conductivity, etc. Effects of improved electrochemical stability, improved wettability and compatibility, high ionic conductivity

Inactive Publication Date: 2019-09-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the oxide electrolyte has good thermal stability and chemical compatibility, but how to improve the lithium ion conductivity at room temperature and improve the interfacial compatibility has become a severe challenge.
The polymer electrolyte is composed of a polymer matrix and a lithium salt, which has the advantages of good viscoelasticity and excellent machinability, but the ionic conductivity at room temperature is low; and the sulfide electrolyte is crystallized due to the large atomic radius and polarizability of S. Lattice distortion forms larger ion channels, showing better ionic conductivity, but the sulfide electrolyte is extremely unstable in the air. In addition, the interfacial contact of the sulfide is not very good due to the existence of the space charge layer.

Method used

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  • High-wettability sulfide-based composite electrolyte with 'sandwich' structure, and preparation method and application of high-wettability sulfide-based composite electrolyte
  • High-wettability sulfide-based composite electrolyte with 'sandwich' structure, and preparation method and application of high-wettability sulfide-based composite electrolyte

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation steps of the "sandwich" structure high wettability sulfide-based composite electrolyte provided in this example are as follows:

[0032] (1) Will Li 2 S and P 2 S 5 High-energy ball milling at a molar ratio of 70:30 to obtain Li with high ionic conductivity 7 P 3 S 11 sulfide solid electrolyte.

[0033] (2) The sulfide solid electrolyte obtained in step (1) was heat-treated at a high temperature of 240 °C for 1 h, and then ground to obtain a solid electrolyte powder.

[0034] (3) The solid electrolyte powder was pressed into a sulfide solid electrolyte sheet in a glove box.

[0035] (4) Dissolve polyvinylidene fluoride and lithium dioxalate borate LiBOB in an appropriate amount of acetonitrile solution at a molar ratio of 10:1, and stir at room temperature for 10 hours to obtain polymer electrolyte solution I.

[0036] (5) Combine polyvinylidene fluoride and lithium nitrate LiNO 3 Dissolve in an appropriate amount of acetonitrile solution at a mo...

Embodiment 2

[0039] (1) Will Li 2 S and P 2 S 5 According to the molar ratio of 75:25, high-energy ball milling was carried out to obtain Li with high ionic conductivity. 3 P.S. 4 sulfide solid electrolyte.

[0040] (2) The sulfide solid electrolyte obtained in step (1) was heat-treated at a high temperature of 260 °C for 1 h, and then ground to obtain a solid electrolyte powder.

[0041] (3) The solid electrolyte powder was pressed into a sulfide solid electrolyte sheet in a glove box.

[0042] (4) Polyethylene oxide and lithium difluorooxalate borate LiODFB were dissolved in an appropriate amount of acetonitrile solution at a molar ratio of 18:1, and stirred at room temperature for 24 hours to obtain polymer electrolyte solution I.

[0043] (5) Polyethylene oxide (PEO) and lithium nitrate LiNO 3 Dissolve in an appropriate amount of acetonitrile solution according to a molar ratio of 18:1, and stir at room temperature for 24 hours to obtain a polymer electrolyte solution .

[004...

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Abstract

The invention discloses a high-wettability sulfide-based composite electrolyte with a 'sandwich' structure, and a preparation method and application of the high-wettability sulfide-based composite electrolyte. The composite electrolyte is formed by compounding a polymer solid electrolyte, a sulfide solid electrolyte and a polymer solid electrolyte. The polymer solid electrolyte I is used for being in contact with a positive electrode material, so the interface wettability between sulfide and the positive electrode material caused by a space charge layer is improved, and the electrochemical stability of the positive electrode material in the charging and discharging process is improved. The polymer solid electrolyte is used for being in contact with a lithium metal negative electrode, so, on one hand, wettability between sulfide and the negative electrode material is improved, and on the other hand, growth of lithium dendrites on the surface of the metal negative electrode is inhibited. The sulfide-based composite electrolyte disclosed by the invention not only has relatively high ionic conductivity, but also has relatively good interface wettability and stability. According to the invention, a new idea is provided for the design and optimization of the solid electrolyte material, thereby facilitating further development and commercialization of an all-solid-state battery.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state batteries, and relates to a sulfide-based composite electrolyte and its preparation method and application, in particular to a "sandwich" structure highly wettable sulfide-based composite electrolyte and its preparation method, and its preparation method in an all-solid-state battery. battery applications. Background technique [0002] With the excessive use of traditional fossil energy such as coal and oil, problems such as energy crisis, environmental pollution and ecological problems have become prominent. Lithium-ion batteries have the advantages of high energy density, large output power, high voltage, small self-discharge, wide operating temperature range, no memory effect, and environmental friendliness, and are regarded as one of the most competitive electrochemical energy storage technologies, and The application in all aspects of energy storage is also becoming more and more ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0065H01M2300/0068H01M2300/0082H01M2300/0088Y02E60/10
Inventor 王家钧刘倩雯左朋建尹鸽平
Owner HARBIN INST OF TECH
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