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Solid electrolyte material system for all solid state lithium battery and preparation method

A solid electrolyte and all-solid-state technology, applied in batteries with solid electrolytes, non-aqueous electrolyte batteries, secondary battery components, etc., can solve problems such as carrier migration and constraint

Active Publication Date: 2007-08-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, the oxygen ions (O 2- ) to the conducting ions (Li + and Na + ) still has a strong charge effect, causing the migration of these carriers to be greatly constrained

Method used

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  • Solid electrolyte material system for all solid state lithium battery and preparation method
  • Solid electrolyte material system for all solid state lithium battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Choose Li 2 S, SiS 2 , AlI3 and LiI powder (or an appropriate molar ratio of Li 2 S, silicon powder, S powder, aluminum powder and iodine particles and LiI powder) are mixed by selected ratio (y=6, m=0.5, z=3, n=1) and carry out batching, then pack into quartz glass tube, Packaged after vacuuming (10 -2 Pa, hydrogen-oxygen fusion seal), carry out solid phase reaction at 500°C-750°C, and the reaction time is 10-14 hours. Take it out at high temperature and quench to room temperature. After the tube is opened, the powder is ground and pressed into tablets (diameter 10mm, thickness about 1mm, pressure 10MPa), and finally made into a lithium ion fast ion conductor test material.

[0024] The conductivity test (see Figure 1) shows that it has ionic conductivity, and the characteristic straight line of ionic conductivity can be clearly observed at the low frequency end of the AC impedance spectrum at different temperatures. By calculation, the total conductivity at room ...

Embodiment 2

[0026] Choose Li 2 S, SiS 2 , AlI 3 The powder is mixed according to the selected ratio (y=6, m=0.5, z=3) for batching, then put into a quartz glass tube, vacuumized and packaged, and the solid phase reaction is carried out at 500 ° C ~ 750 ° C, and the reaction time is 10-14 hours. Take it out at high temperature and quench to room temperature. After the tube is opened, the powder is ground and pressed into tablets (diameter 10mm, thickness about 1mm, pressure 10MPa), and finally made into a lithium ion fast ion conductor test material.

Embodiment 3

[0028] Choose Li 2 S, AlI 3 The powder is mixed according to the selected ratio (x=1.5) for batching, then put into a quartz glass tube, vacuumized and packaged, and solid-phase reaction is carried out at 500°C-750°C, and the reaction time is 10-14 hours. Take it out at high temperature and quench to room temperature. After the tube is opened, the powder is ground and pressed into tablets (diameter 10mm, thickness about 1mm, pressure 10MPa), and finally made into a lithium ion fast ion conductor test material.

[0029] The conductivity test of the system is shown in Figure 4 as a plot of 1gσT against 1000 / T, and the excellent linearization indicates the ionic conductivity of the system; the calculated ion transport activation energy of the material is (0.53eV). The total conductivity at room temperature is 3.60×10 -7 S / cm, up to 2.36×10 at 150°C -3 S / cm.

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Abstract

The invention relates to one solid electrolyte materials and its process method for fix lithium battery, which is characterized by the following: Li2S and other sulfur compound B / S and A / I according to certain mole proportion for compounds to form non-crystal system to provide space for lithium ion transmission to get higher ion conductive rate, wherein, the materials have wider heat stable range to provide one ideal electrolyte prepare materials for solid lithium ion battery.

Description

technical field [0001] The invention relates to a solid electrolyte material system and a preparation method for an all-solid lithium battery. The material mainly behaves as a lithium ion conductor at room temperature and higher temperature (≤160° C.), and belongs to the field of solid electrolyte materials for energy. Background technique [0002] With the wide application of portable electrical appliances such as mobile phones, video cameras and notebook computers, lithium-ion second-generation batteries are very popular. These batteries have the advantages of high output voltage, high energy storage density, and portability. Most of the electrolytes currently used in lithium batteries contain volatile and flammable organic solvents. In order to manufacture batteries with higher output voltage, higher energy density and larger scale, it is necessary to use electrolytes containing a large amount of organic solvents. However, the organic electrolyte in the battery causes ...

Claims

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Application Information

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IPC IPC(8): H01M10/02H01M6/18H01B1/02B01J19/00
CPCY02E60/10
Inventor 刘战强黄富强杨建华曹珍珠孙军康
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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