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Lithium titanium aluminum phosphate solid electrolyte material and preparation method thereof

A solid electrolyte, lithium titanium aluminum phosphate technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of low density lithium ion conductivity of solid electrolytes, high synthesis temperature, excessive energy consumption, etc., to achieve Improve the conductivity of lithium ions, lower the synthesis temperature, and prevent the loss of lithium

Active Publication Date: 2020-06-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The object of the present invention is to provide a kind of preparation method of titanium aluminum lithium phosphate solid electrolyte material, solve the Li 1+x al x Ti 2-x (PO 4 ) 3 The density of the solid electrolyte and the conductivity of lithium ions are not high, and the synthesis temperature is too high during the preparation process, which easily leads to the loss of lithium, excessive energy consumption and complicated processes

Method used

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  • Lithium titanium aluminum phosphate solid electrolyte material and preparation method thereof
  • Lithium titanium aluminum phosphate solid electrolyte material and preparation method thereof
  • Lithium titanium aluminum phosphate solid electrolyte material and preparation method thereof

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Effect test

Embodiment 1

[0037]Aluminum nitrate and urea were used as raw materials and dissolved in deionized water according to the molar ratio of 1:1.5 stoichiometric ratio to obtain a mixed solution; then the mixed solution was placed in a reaction kettle and reacted at 200°C for 12 hours, and then The product is filtered, washed, and dried to obtain the AlOOH precursor; the AlOOH precursor obtained in step (1) with lithium carbonate, titanium dioxide and ammonium dihydrogen phosphate, according to Li, Al, Ti, P molar ratio is 1.3:0.3: 1.7:3 for mixing ingredients, then adding ethanol medium and ball milling, and sintering at 700°C for 6 hours in a dry air atmosphere to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Powder, then the above Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 The bulk briquetting was formed, and the secondary sintering was carried out at 950 °C for 6 hours to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 solid electrolyte material.

Embodiment 2

[0039] Aluminum nitrate and urea were used as raw materials, and were dissolved in deionized water according to the molar ratio of 1:1.5 stoichiometric ratio to obtain a mixed solution; then the mixed solution was placed in a reaction kettle, and reacted at 180°C for 20 hours, and then The product is filtered, washed, and dried to obtain the AlOOH precursor; the AlOOH precursor obtained in step (1) with lithium carbonate, titanium dioxide and ammonium dihydrogen phosphate, according to Li, Al, Ti, P molar ratio is 1.3:0.3: 1.7:3 for mixing ingredients, then adding ethanol medium and ball milling, and sintering at 700°C for 6 hours in a dry air atmosphere to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Powder, then the above Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 The bulk briquetting was formed, and the secondary sintering was carried out at 950 °C for 6 hours to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 solid electrolyte material.

Embodiment 3

[0041] Dissolve aluminum nitrate and urea in deionized water according to the stoichiometric molar ratio of 1:1.5 to obtain a mixed solution; then place the mixed solution in a reaction kettle and react at 220°C for 10 hours, and then The product is filtered, washed, and dried to obtain the AlOOH precursor; the AlOOH precursor obtained in step (1) with lithium carbonate, titanium dioxide and ammonium dihydrogen phosphate, according to Li, Al, Ti, P molar ratio is 1.3:0.3: 1.7:3 for mixing ingredients, then adding ethanol medium and ball milling, and sintering at 700°C for 6 hours in a dry air atmosphere to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Powder, then the above Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 The bulk briquetting was formed, and the secondary sintering was carried out at 950 °C for 6 hours to obtain Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 solid electrolyte material.

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Abstract

The invention provides a lithium titanium aluminum phosphate solid electrolyte material and a preparation method thereof. The preparation method specifically comprises the steps that 1, soluble aluminum salt and a precipitator are mixed and dissolved in water according to the molar ratio of 1: (1.5-2), and a mixed solution is obtained; the mixed solution is placed into a reaction kettle for heating, and a product is subjected to filtering, washing and drying to obtain an AlOOH precursor; (2) the AlOOH precursor obtained in the step (1) is mixed with lithium salt, titanium salt and phosphorus salt; Li, Al, Ti and P are mixed according to a molar ratio of (1+x): x: (2-x): 3, an ethanol medium is added, ball milling is performed, and presintering and secondary molding sintering are carried out in a dry air atmosphere to obtain the lithium titanium aluminum phosphate solid electrolyte material. The method is simple in process, low in synthesis temperature and easy to implement industrially, and the prepared lithium titanium aluminum phosphate solid electrolyte material is high in purity, good in density and high in lithium ion conductivity.

Description

technical field [0001] The invention relates to the field of solid electrolyte materials, in particular to a lithium titanium aluminum phosphate solid electrolyte material and a preparation method thereof. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that operates primarily by moving lithium ions between positive and negative electrodes. During the charge and discharge process, Li intercalates and deintercalates back and forth between the two electrodes: during charging, Li deintercalates from the positive electrode, intercalates through the electrolyte into the negative electrode, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Due to the advantages of light weight, high energy density, good cycle performance, no memory effect, and environmental protection, lithium-ion batteries have broad application prospects in mobile communications, electric vehicles, and national defense ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/622C04B35/626C04B35/63H01M10/0525H01M10/0562
CPCC04B35/447C04B35/622C04B35/62675C04B35/6303H01M10/0562H01M10/0525H01M2300/0068C04B2235/3203C04B2235/3217C04B2235/3232C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/782C04B2235/786C04B2235/5436Y02E60/10
Inventor 武开鹏何盈春
Owner SOUTHWEAT UNIV OF SCI & TECH
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