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NASICON type solid electrolyte with high ionic conductivity and preparation method thereof

A solid electrolyte and ionic conductivity technology, applied in electrolytes, circuits, electrical components, etc., can solve the problems of low ionic conductivity at room temperature, reduced lithium battery performance, poor chemical stability, etc., to reduce grain boundary resistance and increase compactness , The effect of improving the conductivity at room temperature

Inactive Publication Date: 2019-10-11
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It synthesizes a solid electrolyte with excellent performance by controlling the preparation process parameters such as heating rate, pre-calcination temperature, pre-calcination time, calcination temperature and calcination time. The normal temperature ionic conductivity of the solid electrolyte exceeds 10 -4 S / cm, but due to Ti 4+ Ions have the disadvantage of being easy to change in price, and when they are applied to all-solid-state lithium batteries, they will capture a large amount of Li + ions, resulting in reduced performance of lithium batteries
[0007] The above patents are all based on Li 1+x A x B 2-x (PO 4 ) 3 (A=Al, B=Ti, Zr) composed of NASICON structural framework, these NASICON solid electrolytes have disadvantages such as low ionic conductivity at room temperature or poor chemical stability

Method used

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  • NASICON type solid electrolyte with high ionic conductivity and preparation method thereof
  • NASICON type solid electrolyte with high ionic conductivity and preparation method thereof
  • NASICON type solid electrolyte with high ionic conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw material composition is shown in Table 1, and the specific preparation process is as follows:

[0029] Weigh raw materials (20g in total):

[0030]

[0031] Put the weighed raw materials in an agate mortar and grind them fully to form a mixed powder, put the ground mixed powder in a platinum crucible, and put it in a muffle furnace at about 200°C, preheat for 2 to 24 hours to remove impurities and moisture. The mixture obtained after preheating was placed in an agate mortar and fully ground again to obtain a uniformly dry powder, and then the prepared powder was placed in a platinum crucible again and melted in a high-temperature furnace over 1100°C for 10 minutes, and then The temperature was raised to not lower than 1200°C and kept for about 60 minutes. Thereafter, lower the temperature to about 1100°C and let stand for about 30 minutes. Cast the uniform glass liquid on the preheated cast iron mold, and transfer it to the annealing furnace quickly after ...

Embodiment 2

[0033] The raw material composition is shown in Table 1, and the specific preparation process is as follows:

[0034] Weigh raw materials (20g in total):

[0035]

[0036] Put the weighed raw materials in an agate mortar and grind them fully to form a mixed powder, put the ground mixed powder in a platinum crucible, and put it in a muffle furnace at about 200°C, preheat for 2 to 24 hours to remove impurities and moisture. The mixture obtained after preheating was placed in an agate mortar and fully ground again to obtain a uniformly dry powder, and then the prepared powder was placed in a platinum crucible again and melted in a high-temperature furnace over 1100°C for 10 minutes, and then The temperature was raised to not lower than 1200°C and kept for about 60 minutes. Thereafter, lower the temperature to about 1100°C and let stand for about 30 minutes. Cast the uniform glass liquid on the preheated cast iron mold, and transfer it to the annealing furnace quickly after ...

Embodiment 3

[0038] The raw material composition is shown in Table 1, and the specific preparation process is as follows:

[0039] Weigh raw materials (20g in total):

[0040]

[0041] Put the weighed raw materials in an agate mortar and grind them fully to form a mixed powder, put the ground mixed powder in a platinum crucible, and put it in a muffle furnace at about 200°C, preheat for 2 to 24 hours to remove impurities and moisture. The mixture obtained after preheating was placed in an agate mortar and fully ground again to obtain a uniformly dry powder, and then the prepared powder was placed in a platinum crucible again and melted in a high-temperature furnace over 1100°C for 10 minutes, and then The temperature was raised to not lower than 1200°C and kept for about 60 minutes. Thereafter, lower the temperature to about 1100°C and let stand for about 30 minutes. Cast the uniform glass liquid on the preheated cast iron mold, and transfer it to the annealing furnace quickly after it...

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Abstract

The invention relates to a NASICON type solid electrolyte with high ionic conductivity and a preparation method thereof. The method comprises the following steps that B2O3 is introduced into Li1+xAlxGe2-xP3O12 (x is greater than or equal to 0 and less than or equal to 1, and the following x is within the range) microcrystalline glass to further lower the activation energy of Li+ ions, so that theionic conductivity of the microcrystalline glass is improved. The NASICON solid electrolyte main body is Li1+xAlxGe2-xP3O12 microcrystalline glass, which comprises the following molar components: 14.82-25.00mol% of Li2O, 24.69-45.00mol% of GeO2, 2.47-12.50mol% of Al2O3, 37.04-37.50mol% of P2O5 and 0.01-1.23mol% of B2O3. According to the preparation method disclosed by the invention, a platinum crucible is adopted to prepare a glass precursor, and then the glass precursor is subjected to heat treatment in a muffle furnace to obtain the microcrystalline glass solid electrolyte with the NASICON structure. By controlling the doping concentration of B2O3, the ionic conductivity of the NASICON type solid electrolyte at normal temperature is improved by about four times; and the solid electrolytehas the advantages of high ionic conductivity, no toxicity, safety, stability, easiness in processing and the like, and has a great application prospect in all-solid state lithium batteries.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes for lithium ion batteries, in particular to a NASICON type solid electrolyte with high ion conductivity for lithium ion batteries and a preparation method thereof. [0002] technical background [0003] At present, the world is facing the dilemma of environmental pollution and lack of fossil energy. Electronization and electrification represent the development direction of the future energy field, and battery technology is the key to carrying this goal. In recent years, the development of smart products and pure electric vehicles has increasingly highlighted the defects of current battery technology, such as complex structure, low power density, flammability and explosion, short charge and discharge life, etc. and other important areas of development. Battery technology urgently needs to achieve leapfrog development, and all-solid-state batteries can solve the above problems well. Comp...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0562
CPCH01M10/0562H01M10/0525H01M2300/0071Y02E60/10
Inventor 张宗辉任进军胡丽丽
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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