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Lithium borohydride compound fast ion conductor and preparation method thereof

An ion conductor and lithium borohydride technology, which is applied in the field of lithium borohydride composite fast ion conductor and its preparation, and can solve problems such as hidden dangers of battery safety.

Inactive Publication Date: 2018-06-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The electrolyte of lithium-ion secondary batteries is currently widely used in flammable liquid organic substances. When the size of the battery is further enlarged and the charge and discharge power is further increased, this type of electrolyte will bring many unpredictable safety hazards to the use of the battery.

Method used

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  • Lithium borohydride compound fast ion conductor and preparation method thereof
  • Lithium borohydride compound fast ion conductor and preparation method thereof
  • Lithium borohydride compound fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the isolation of air (H 2 O2 4 The mixture of -NaX is calculated according to the set molar ratio (1~4:1), and put into a stainless steel ball tank equipped with stainless steel grinding balls; the mechanical ball milling method of the planetary wheel ball mill is used to obtain high-purity ( 99.9999%) under the protection of inert gas, LiBH was obtained respectively 4 -NaCl or LiBH 4 - NaI complex particles. The total mass of the sample in the spherical tank is 1g, the volume of the ball milling tank is 100ml, the weight ratio of the balls to the sample is 40:1, the ball milling time is 20-40 hours, and the revolution speed is set at 400-450rpm.

Embodiment 2

[0031] Take out the LiBH prepared according to the method of Example 1 4 -NaX (X refers to Cl - ,I - Ion) complex particles for X-ray diffraction (XRD) experiments, the sample cell is covered by a specific polymer film, and it is sealed with the glass slide with vacuum grease to prevent the effect of water and oxygen in the air on the sample. The target material of the X-ray source used is a Cu target, the tube voltage is 40kV, and the tube current is 40mA. The resulting XRD spectrum is as figure 1 , 2 shown.

Embodiment 3

[0033] A series of LiBH obtained in embodiment 1 4 -NaX (X refers to Cl - ,I - The ion) ball milled sample was pressed into a disc with a diameter of 10 mm and a thickness of about 1 mm with a pressure of 20 MPa. Two lithium foils were placed on both sides of the sample disc as electrodes. 1 ton / cm 2The pressure of the lithium foil and the sample sheet are pressed tightly. All preparations were performed under high purity argon (99.9999%). The frequency range of the AC impedance test is from 1MHz to 100Hz. The sample was heated at a rate of 2°C / min, and impedance spectra were collected every 5°C. The temperature rose from room temperature to 120°C. Obtain the ion transport resistance and conductivity through the obtained AC impedance Nyquist spectrum, and make the change curve of conductivity with temperature as shown in image 3 , 4 shown.

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Abstract

The invention discloses a lithium borohydride compound fast ion conductor and a preparation method thereof. The material system of LiBH4-NaX compound comprises a combination of two phases of LiBH4 andNaCl, or LiBH4 and NaI, wherein LiBH4-NaX (X refers to CI<-> and I<-> ions) is formed through composition compounding according to the molar ratio range (1-10):1. The LiBH4 compound fast ion conductor is prepared under the air-free (H2O is less than 1ppm, and O2 is less than 1ppm) situation. The LiBH4-NaX (X refers to Cl<-> and I<-> ions) compound fast ion conductor is a lithium-ion conductor with the excellent low-temperature performance, and has the probability of serving as solid electrolytes of full solid state lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of design and preparation of solid electrolyte materials, and in particular relates to a lithium borohydride composite fast ion conductor and a preparation method thereof. technical background [0002] The electrolyte of lithium-ion secondary batteries is currently widely used in flammable liquid organic substances. When the size of the battery is further enlarged and the charge and discharge power is further increased, this type of electrolyte will bring many unpredictable safety hazards to the use of the battery. In recent years, it has been proposed to use inorganic solid-phase electrolytes instead of organic liquid-phase electrolytes to eliminate potential safety hazards in the large-scale application of lithium-ion batteries. So far, people have developed a variety of oxide and sulfide material systems, such as perovskite (ABO 3 ) type of lanthanum lithium titanate (LLT), with NaA 2 (PO 4 ) 3 Struct...

Claims

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Application Information

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IPC IPC(8): H01M10/0562
CPCH01M10/0562Y02E60/10
Inventor 张耀相梦园
Owner SOUTHEAST UNIV
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