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Phosphate lithium fast ion conductor material and preparation method thereof

A technology of conductor materials and ion conductors, applied in the field of component design and preparation of lithium fast ion conductor materials, can solve the problems of low material density, gap in ion conductivity, high room temperature conductivity, etc.

Active Publication Date: 2015-07-29
JIANGXI GANFENG BATTERY TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] Currently, the preparation of LiM 2 (PO 4 ) 3 The method of ceramic materials is mainly the traditional high-temperature sintering method, but the density of the material obtained by this method is not high, there are many internal defects, and the purity of the phase is not satisfactory, resulting in a gap between its ionic conductivity and the actual application level
[0007] In summary, there is still a lack of a lithium fast ion conductor material with high density, high room temperature conductivity, stable preparation method for air, and suitable for industrial production.

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  • Phosphate lithium fast ion conductor material and preparation method thereof
  • Phosphate lithium fast ion conductor material and preparation method thereof
  • Phosphate lithium fast ion conductor material and preparation method thereof

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preparation example Construction

[0086] Preparation of Lithium Phosphate Fast Ion Conductor Material

[0087] The invention also provides a method for preparing the material. In the prior art, the method for preparing lithium phosphate fast ion conductor materials needs to immediately anneal the glass formed after quenching at a medium-high temperature, such as 500°C. This process can easily cause cracks in the glass due to stress, and eventually affect material properties.

[0088]In the present invention, after high-temperature quenching to form glass, instead of immediately performing medium-high temperature annealing, it is immediately and thoroughly cooled, and then the glass powder is prepared, and finally the powder is pressed and annealed. This processing method can be very good The possibility of cracks in the current technology can be avoided, and dense and stable materials can be prepared well by subsequent cold isostatic pressing and annealing.

[0089] Specifically, the present invention provid...

Embodiment 1

[0121] Will Li 2 CO 3 : Al(OH) 3 : GeO 2 : SiO 2 : NH 4 h 2 PO 4 According to Li 1.61 al 0.5 Ge 1.5 Si 0.01 P 2.99 o 12.05 Stoichiometric ingredients, evenly mixed and dried. The powder was heated to 700°C for 2 hours, cooled and crushed under wet grinding conditions and dried. Then heat the powder to 1400°C and keep it warm for 2 hours, and then pour it into liquid nitrogen to quench. After the product is cooled, it is pulverized and dried under wet grinding conditions, and the glass powder is pressed under 300 MPa. The block was first kept at 520°C for 6 hours, then at 900°C for 6 hours, and then cooled in the furnace to obtain a glass ceramic lithium fast ion block material. After the glass-ceramic block is machined, gold is used as the blocking electrode, and the AC impedance test is carried out at room temperature, and the test frequency is 1 MHz to 0.1 Hz. The ionic conductivity of the sample is obtained by calculation, and the room temperature AC impedan...

Embodiment 2

[0123] Will Li 2 CO 3 : Al(OH) 3 : GeO 2 : SiO 2 : NH 4 h 2 PO 4 According to Li1.62 Al 0.5 Ge 1.5 Si 0.02 P 2.98 o 12.05 Stoichiometric ingredients, evenly mixed and dried. The powder was heated to 750°C for 2 hours, cooled and crushed under wet grinding conditions and dried. Then heat the powder to 1450°C and keep it warm for 2 hours, and then pour it into liquid nitrogen to quench. After the product is cooled, it is pulverized and dried under wet grinding conditions, and the glass powder is pressed under 300 MPa. The block was first kept at 550°C for 4h, then at 900°C for 6h, and then cooled in the furnace to obtain a glass-ceramic lithium fast ion block material. After the glass-ceramic block is machined, gold is used as the blocking electrode, and the AC impedance test is carried out at room temperature, and the test frequency is 1 MHz to 0.1 Hz. The ionic conductivity of the sample was obtained by calculation, and its room temperature ionic conductivity wa...

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Abstract

The invention provides a phosphate lithium fast ion conductor material and a preparation method thereof. Specifically, the invention provides a method for preparing a Li1+x+y+zAlxGe2-xSiyP3-yO12+z / 2 fast ion conductor material. The method comprises the steps of: providing a powder of glass powder or amorphous powder with the above-described ratio of elements; molding the powder to obtain a molded glass body; annealing the molded glass body to obtain the fast ion conductor material, wherein x, y and z satisfy the relations of 0<x<=2,0<=y<=0.4,0<=z<=0.5. The preparation method of the invention has the characteristics of convenience, high yield, and suitability for industrialized preparation; and the prepared material has very good electrical properties.

Description

technical field [0001] The invention belongs to the field of solid-state ion materials, in particular, the invention relates to a component design of a lithium fast ion conductor material and a preparation method thereof. Background technique [0002] The application and development of lithium-ion batteries as a chemical energy storage method is relatively late, but it is regarded as one of the most competitive electrochemical energy storage technologies due to its light weight, high specific energy / specific power, and long life. It is also widely used in various aspects of energy storage. The mass production of lithium-ion batteries of different systems has laid a good technical foundation for their application in energy storage systems. At present, lithium-ion batteries have the conditions of long life, safety and reliability, low maintenance costs, and high conversion efficiency. With the advancement of battery management system technology, they have broken through the d...

Claims

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Application Information

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IPC IPC(8): H01M10/0562
CPCH01M10/0562H01M2300/0068Y02E60/10
Inventor 许晓雄黄祯杨菁邱志军彭刚
Owner JIANGXI GANFENG BATTERY TECH
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