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Inorganic solid-state electrolyte material and preparation method therefor

A solid electrolyte and electrolyte material technology, applied in the field of inorganic solid electrolyte materials and their preparation, can solve the problems of easy leakage, low reliability, easy corrosion and the like

Active Publication Date: 2016-05-25
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional lithium-ion batteries use organic electrolytes, which have problems such as easy leakage, corrosion, poor safety and low reliability, and have become an important bottleneck in the development of lithium-ion batteries.

Method used

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  • Inorganic solid-state electrolyte material and preparation method therefor
  • Inorganic solid-state electrolyte material and preparation method therefor
  • Inorganic solid-state electrolyte material and preparation method therefor

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preparation example Construction

[0023] The preparation method of the inorganic solid electrolyte with NASICON structure provided by the invention comprises the following steps:

[0024] Mixing the reactant material weighed in molar ratio with water;

[0025] Stirring, sintering and grinding the mixture in an oil bath;

[0026] The powder was pressed, sintered, and tested for electrical conductivity.

[0027] Specifically, according to the molar ratio 1+x:0.5x:2-x:3, weigh lithium compound, aluminum compound, M oxide, phosphorus compound, pour it into a beaker filled with 250ml deionized water, and then put it into 180 Heat and stir in an oil bath at ℃ to obtain a viscous material, put it into a muffle furnace and heat it to a certain temperature at a heating rate of 2°C / min and keep it warm, then cool to room temperature with the furnace, and the sintered material is high-energy ball milled at a speed of 450rpm 10h, get Li 1+x al x m 2-x (PO 4 ) 3 Electrolyte powder.

[0028] Under the pressure of 30...

Embodiment 1

[0031] Weigh a certain amount of lithium hydroxide, aluminum oxide, titanium dioxide and phosphoric acid according to the molar ratio of 1.3:0.15:1.7:3, then pour it into a beaker filled with 250ml deionized water, and then put it in a 200°C oil bath Heat and stir to obtain a viscous material, put it into a muffle furnace and heat it to 700 °C at a heating rate of 2 °C / min, keep it for 4 hours, and mill the sintered material at a speed of 450 rpm for 10 hours to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) electrolyte powder. After obtaining the electrolyte material, press it into a disc with a diameter of 15 mm and a thickness of 1 mm under a pressure of 30 MPa, put it into a muffle furnace and heat it to 800 °C at a heating rate of 2 °C / min, and keep it for 6 hours to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Electrolyte material, with gold electrode as blocking electrode, AC impedance was tested at room temperature.

[0032] The results show that at 25°C, its lithium i...

Embodiment 2

[0034] Weigh a certain amount of lithium hydroxide, aluminum oxide, titanium dioxide and phosphoric acid according to the molar ratio of 1.3:0.15:1.7:3, pour them into a beaker filled with 250ml of deionized water, and then heat them in an oil bath at 170°C Stir to obtain a viscous material, put it into a muffle furnace and heat it to 800 °C at a heating rate of 2 °C / min, keep it for 4 hours, and high-energy ball mill the sintered material at a speed of 450 rpm for 10 hours to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3Electrolyte powder. After obtaining the electrolyte material, press it into a disc with a diameter of 15 mm and a thickness of 1 mm under a pressure of 30 MPa, put it into a muffle furnace and heat it to 750 °C at a heating rate of 2 °C / min, and keep it for 6 hours to obtain Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Electrolyte material, with gold electrode as blocking electrode, AC impedance was tested at room temperature.

[0035] The results show that at 25°C, its li...

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Abstract

The invention relates to the technical field of a lithium ion battery and particularly to an inorganic solid-state electrolyte material and a preparation method therefor. Reaction raw materials are weighed based on a molar ratio of Li<+>:Al<3+>:M<4+>:P<5+> being equal to (1+x):x:(2-x):3; the reaction raw materials are mixed with deionized water to obtain a mixture; the mixture is heated and stirred, and moisture is evaporated to obtain a viscous material; the viscous material is sintered at a low temperature, and then is subjected to high energy ball milling to obtain an Li<1+x>Al<x>M<2-x>(PO4)3 (x is greater than or equal to 0 and less than or equal to 1) electrolyte powder, wherein M is Ti, Ge, Zr, Hf or Sn. The inorganic solid-state electrolyte material and the preparation method therefor are characterized in that the electrolyte material is simple in preparation process, relatively low in sintering temperature, and relatively high in conductivity (10<-3>Scm<-1>), and the obtained electrolyte material can be used for an all-solid-state lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an inorganic solid electrolyte material and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries use organic electrolytes, which have problems such as easy leakage, corrosion, poor safety and low reliability, and have become an important bottleneck in the development of lithium-ion batteries. In order to overcome the problems faced by existing commercial liquid lithium-ion batteries, researchers are vigorously developing lithium-ion batteries based on solid electrolytes, which have significant advantages: ① solid electrolytes are non-volatile, generally non-flammable, and have excellent safety; ② All-solid-state batteries can work at higher temperatures; ③ solid electrolytes can maintain good chemical stability in the air for a long time; ④ some solid electrolyte materials have a wide electrochemical window, and can use high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562
CPCH01M10/0562H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 金永成马福瑞赵二庆孙德业
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI