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Combined boron cage ionic compound fast ion conductor material and preparation method thereof

A technology of ionic compounds and ionic conductors, which can be used in the manufacture of final products, electrochemical generators, sustainable manufacturing/processing, etc. It can solve the problems of easily damaged anode materials, flammability, and explosion, and achieve good thermal/chemical stability. properties, excellent room temperature ionic conductivity, and the effect of high ionic conductivity

Inactive Publication Date: 2022-02-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that organic solvents can easily damage the structure of the negative electrode material during the charging process, resulting in electrode passivation, and battery safety issues such as flammability, explosion, and liquid leakage often occur.

Method used

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  • Combined boron cage ionic compound fast ion conductor material and preparation method thereof
  • Combined boron cage ionic compound fast ion conductor material and preparation method thereof
  • Combined boron cage ionic compound fast ion conductor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, Na 2 B 20 h 18 Fast ion conductor preparation

[0026] Take dry (Et 4 N) 2 B 20 h 18 Dissolved in acetonitrile / water solvent, after passing through strongly acidic cationic resin, (H 3 O) 2 B 20 h 18 solution, and then reacted with aqueous sodium hydroxide solution to obtain Na 2 B20 h 18 solution, after drying by rotary evaporation, the product was heated in vacuum at 150 °C for 3.0 hours to obtain Na 2 B 20 h 18 . The conductivity of the fast ion conductor was tested with an electrochemical workstation (CHI760E, Shanghai) as the detection equipment, using a three-electrode system, and the solid fast ion conductor Na 2 B 20 h 18 Press the tablet to make a test sheet with a certain thickness and area; assemble it from bottom to top according to the stainless steel substrate, fast ion conductor test piece, and stainless steel substrate, and conduct AC impedance (AC impedance) tests at different temperatures, and according to the formula : σ =...

Embodiment 2

[0027] Example 2, Li 2 B 20 h 18 Fast ion conductor preparation

[0028] The dried (Et 4 N) 2 B 20 h 18 Dissolved in solvents such as acetonitrile / water, after passing through a strongly acidic cationic resin, (H 3 O) 2 B 20 h 18 , and then react with lithium hydroxide solution to obtain Li 2 B 20 h 18 Solution, after drying by rotary evaporation, the product was heated at 150°C for 3.0 hours to obtain the fast ion conductor Li 2 B 20 h 18 . At different temperatures, conduct AC impedance tests and calculate the ionic conductivity of the material at different temperatures according to the formula, the results are as follows Figure 4 shown. The calculation results show that at room temperature Li 2 B 20 h 18 The ionic conductivity is 1.1×10 -6 S / cm.

Embodiment 3

[0029] Example 3, Na 2 B 20 h 18 / Na 2 B 12 h 12 composite fast ion conductor

[0030] the dried Na 2 B 20 h 18 and Na 2 B 12 h 12 Mix them in molar ratios of 1:1, 1:2, 1:3, 1:4, 1:5 and 1:6 respectively, add them to the ball mill jar respectively, and ball mill 3.0 at the speed of 400 rpm under the condition of isolating the air. hours, get Na 2 B 20 h 18 / Na 2 B 12 h 12 Composite fast ion conductor. At different temperatures, AC impedance tests were carried out and the ionic conductivity of each material at different temperatures was calculated according to the formula. The results are as follows Figure 5 shown. The calculation results show that at room temperature Na 2 B 20 h 18 -4Na 2 B 12 h 12 The highest conductivity is 2.8×10 -4 S / cm.

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Abstract

The invention belongs to the technical field of fast ion conductors, and particularly relates to a combined boron cage ionic compound fast ion conductor material and a preparation method thereof. The main component of the combined boron cage ionic conductor material is MB20H18 and / or MB20H19, Wherein M is a metal cation, and the anion is B20H18 < 2-> or B20H19 < 3->; the metal cation M is a single metal ion or multiple composite metal ions. The preparation method comprises the following steps: reacting a B20H18<2->or B20H19<3->initiator with a corresponding metal or a metal compound to prepare a solution of an MB20H18 or MB20H19 compound; and evaporating the solvent, and carrying out vacuum high-temperature heat treatment to completely remove the solvent to obtain a solvent-free target compound. The fast ion conductor has the advantages of good thermal / chemical stability, high ionic conductivity, wide electrochemical window and the like, and can be used in liquid batteries, supercapacitors, all-solid inorganic salt electrolytes and polymer electrolytes.

Description

technical field [0001] The invention belongs to the technical field of fast ion conductors, and in particular relates to a combined boron cage fast ion conductor and a preparation method thereof. Background technique [0002] With the rapid development of the energy and electronics industries, people's demand for energy storage devices is gradually increasing. More and more attention has been paid to research on secondary batteries such as lithium-ion batteries, sodium-ion batteries, and potassium-ion batteries. This type of battery usually consists of four parts: positive electrode, negative electrode, separator and electrolyte, and mainly relies on the movement of metal ions between the positive and negative electrodes. The metal ions move back and forth between the positive and negative electrodes through the electrolyte to realize the charge and discharge cycle of the battery, and the separator plays the role of preventing short circuit. Traditional electrolytes consis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058
CPCH01M10/0562H01M10/058Y02E60/10Y02P70/50
Inventor 郭艳辉杨卓程盛金孟媛马晓华
Owner FUDAN UNIV
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