Lithium-lanthanum-silicon-sulfur solid electrolyte material for secondary lithium cell and its preparing method

A solid electrolyte and secondary lithium battery technology, which is applied in secondary battery manufacturing, secondary batteries, secondary battery components, etc., can solve the problems of conductive cation 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 conductive cations in the channel (Li + and Na + ) still has a strong charge effect, resulting in the migration of these conductive cations being greatly constrained

Method used

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  • Lithium-lanthanum-silicon-sulfur solid electrolyte material for secondary lithium cell and its preparing method
  • Lithium-lanthanum-silicon-sulfur solid electrolyte material for secondary lithium cell and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using Li 2 S and SiS 2 and La 2 S 3 Powder (purity respectively 99%, 99.0%, 99.0%)) was weighed according to the molar ratio of 6:0.5:3 and loaded into a high-energy ball mill jar (ZrO 2 material), high-energy ball milling under the protection of argon atmosphere for 10 hours, and finally pressed into tablets (diameter 10mm, thickness 1mm, pressure 8MPa), a layer of indium film was pressed on the surface as a conductive electrode, and finally a block test of a solid electrolyte was made Material.

[0028] The conductivity test 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 temperature can be obtained as 5.35×10 -5 S / cm, at the same time, by plotting lgσT against 1000 / T, the ion transport activation energy of the material is (0.129eV).

Embodiment 2

[0030] Using Li 2 S, SiS 2 and La 2 S 3 Powder (purity is 99%, 99.0%, 99.0%) is weighed according to the molar ratio of 6:0.5:3 and put into glass tube, vacuumize (less than 10 -2 Pa) and seal it with a hydrogen-oxygen flame. Slowly raise the temperature of the glass tube containing the mixture to 450°C and keep it warm for 24h, then raise the temperature to 650°C-750°C for solid phase reaction, and the reaction time is 10-12h. After water-cooling and quenching, the tube was opened, and the powder was ground under the protection of an argon atmosphere. The tableting process was the same as that of Test Embodiment 1.

[0031] The performance test results are basically the same as 1, and its room temperature ionic conductivity is 1.25×10 -5 S / cm, lower than Example 1.

Embodiment 3

[0033] Using La powder, Si powder, S powder and Li 2 S powder (purity respectively 99.99%, 99.9%, 99% and 99.0%) according to 6Li 2 S-0.5La 2 S 3 -3SiS 2 The stoichiometric ratio is weighed and packed into a glass tube, and finally made into a solid electrolyte material according to the method of Embodiment 2.

[0034] The performance test results are basically the same as 1, and its room temperature conductance is about 1.0×10 -5 S / cm, lower than Examples 1 and 2.

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Abstract

Characters of the invention are that chemical composition of solid electrolyte of Li-La-Si-S is compound from three different sulfides Li2S, La2S3 and SiS2 according to mol ratio 6 : 0.5 : 3. The solid electrolyte forms system of amorphous state to provide transmission space for lithium ion so as to obtain higher ionic conductivity (ionic conductivity in room temperature about 5.35*10-5S / cm), and lower electron conductivity (electron conductivity in room temperature<1.0*10-8S / cm=, lower activation energy of material (0.129eV), and wider thermostable range (room temperature - 200 deg.C). The invention provides comparative ideal candidate of electrolyte material for practical lithium ion battery in full solid state.

Description

technical field [0001] The present invention relates to a kind of brand-new sulfide system Li that can be used for secondary lithium battery solid electrolyte material 2 S-La 2 S 3 -SiS 2 and its preparation method. The material system mainly behaves as a lithium ion conductor at room temperature and higher temperature (≤200°C), and its total conductivity at room temperature can reach 5.35×10 -5 S / cm, its activation energy is only 0.129eV, which is far lower than the currently reported sulfide system, and 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 manufact...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/36H01M10/02H01B1/10C01B17/20B01J19/00H01M10/052H01M10/0562
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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