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Li2S-Al2S3 solid electrolyte material for secondary lithium cell and its preparing method

A solid electrolyte, secondary lithium battery technology, applied in secondary battery manufacturing, secondary battery, secondary battery parts and other directions, can solve problems such as carrier migration and binding

Active Publication Date: 2007-03-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Li2S-Al2S3 solid electrolyte material for secondary lithium cell and its preparing method
  • Li2S-Al2S3 solid electrolyte material for secondary lithium cell and its preparing method
  • Li2S-Al2S3 solid electrolyte material for secondary lithium cell and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using Al 2 S 3 and Li 2 S powder (purity > 98%, 99.0%) was weighed according to a molar ratio of 1:1 and packed into a high-energy ball mill jar (ZrO 2 material), high-energy ball milling under the protection of an argon atmosphere for 10 hours, pressed into tablets (10mm in diameter, 1.4mm in thickness, and 8MPa in pressure), evaporated gold on the surface as conductive electrodes, and finally made a bulk test material of solid electrolyte.

[0028] The conductivity test shows that it has ionic conductivity, and the characteristic straight line segment of ionic conductivity can be clearly observed at the low frequency end of the impedance spectrum at room temperature and high temperature (80°C). By calculation, the total conductivity at room temperature can be obtained as 1.77×10 -5 S / cm, at the same time, plotting 1gσT against 1000 / T, the ion transport activation energy of the material is (~0.15eV).

Embodiment 2

[0030] Using Al 2 S 3 and Li 2 S powder (purity>98% and 99.0% respectively) is weighed according to the molar ratio of 1:1 and put into a glass tube, evacuated and sealed, sealed after evacuated, and solid-phase reaction is carried out at 650°C to 750°C. The time is 10 to 12 hours. After the tube is opened, the powder is ground and then packaged, and the second solid phase reaction is carried out. The body was ground, and the tabletting process was the same as in Example 1.

[0031] The performance test results are basically the same as 1, and its room temperature ionic conductivity is 5.40×10 -6 S / cm, slightly lower than Example 1.

Embodiment 3

[0033] Using Al powder, S powder and Li 2 S powder (purities of 99.99%, 99% and 99.0% respectively) according to LiAlS 2 The stoichiometric ratio was weighed and packed into a glass tube, and the solid electrolyte material was finally made according to the method of Example 1.

[0034] The performance test result is basically the same as that of Example 2.

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Abstract

Characters of the invention are that materials of solid electrolyte Li : Al : S=1 :1 :2 (at mol ratio) are amorphous material. Aluminum sulphide is as framework of providing transmission space for lithium ion so as to obtain higher ionic conductivity (ionic conductivity in room temperature about 1.77*10-5S / cm), lower electron conductivity (electron conductivity in room temperature less than 1.0*10-8S / cm), lower activation energy of material, and wider thermostable range. The invention provides comparative ideal candidate of electrolyte material for practical lithium ion battery in full solid state.

Description

technical field [0001] The invention relates to a solid electrolyte material LiAlS that can be used for secondary lithium batteries 2 and its preparation method. The material is mainly a lithium ion conductor at room temperature and higher temperature (≤200°C), and its total conductivity at room temperature is 1.78×10 -5 S / cm, its ion transport activation energy is 0.15eV, it is an energy material. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/36H01M10/02H01B1/10C01B17/20B01J19/00H01M10/0562
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 黄富强刘伟丰杨建华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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