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Rare earth metal or transition metal doped lithium titanium phosphate/carbon composite material and preparation method and application thereof

A carbon composite material, lithium titanium phosphate technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as low electronic conductivity

Active Publication Date: 2020-12-18
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve LiTi 2 (PO 4 ) 3 To solve the technical problem of low electronic conductivity, and provide lithium titanium phosphate / carbon composite material doped with rare earth metal or transition metal and its preparation method and application

Method used

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  • Rare earth metal or transition metal doped lithium titanium phosphate/carbon composite material and preparation method and application thereof
  • Rare earth metal or transition metal doped lithium titanium phosphate/carbon composite material and preparation method and application thereof
  • Rare earth metal or transition metal doped lithium titanium phosphate/carbon composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The preparation method of ytterbium-doped lithium titanium phosphate / carbon composite material includes the following steps: respectively weighing 0.25g of lithium hydroxide, 3.57g of ammonium dihydrogen phosphate, and 11.85g of bis(2-hydroxypropionic acid) dihydroxide Titanium diammonium, 0.1833g ytterbium nitrate, add 300mL deionized water and magnetically stir for 0.5h to obtain a mixed solution; the mixed solution is spray-dried, and the spray dryer is used for spray drying. The parameter setting of the spray dryer: outlet temperature 100℃, the speed of the peristaltic pump is 15r / min, and the intermediate powder is obtained after spray drying;

[0037]Weigh 0.6g of intermediate powder and 0.3281g of anhydrous citric acid, grind and mix them evenly, place them in a tube furnace at 600°C and Ar atmosphere for 12h, set the heating rate to 4°C / min, and obtain ytterbium-doped titanium phosphate after cooling. Lithium / carbon composite material, abbreviated as LiYb0.04Ti1.97(PO4)3 / ...

Embodiment 2

[0040]The preparation method of ytterbium-doped lithium titanium phosphate / carbon composite material includes the following steps: respectively weighing 0.25g of lithium hydroxide, 3.57g of ammonium dihydrogen phosphate, and 11.85g of bis(2-hydroxypropionic acid) dihydroxide Titanium diammonium, 0.1833g ytterbium nitrate, add 300mL deionized water and magnetically stir for 0.5h to obtain a mixed solution; the mixed solution is spray-dried, and the spray dryer is used for spray drying. The parameter setting of the spray dryer: outlet temperature 100℃, the speed of the peristaltic pump is 15r / min, and the intermediate powder is obtained after spray drying;

[0041]Weigh 0.6g of intermediate powder and 0.3281g of anhydrous citric acid, grind and mix them evenly, place them in a tube furnace at 700℃ and Ar atmosphere for 12h, set the heating rate to 4℃ / min, and obtain Ytterbium-doped titanium phosphate after cooling. Lithium / carbon composite material, abbreviated as LiYb0.04Ti1.97(PO4)3 / C ...

Embodiment 3

[0046]The preparation method of ytterbium-doped lithium titanium phosphate / carbon composite material includes the following steps: respectively weighing 0.25g lithium hydroxide, 3.57g ammonium dihydrogen phosphate, 11.65g bis(2-hydroxypropionic acid) dihydroxide Titanium diammonium, 0.3680g ytterbium nitrate, add 300mL deionized water and magnetically stir for 0.5h to obtain a mixed solution; spray-dry the mixed solution with a spray dryer, spray dryer parameter setting: outlet temperature 100℃, the speed of the peristaltic pump is 15r / min, and the intermediate powder is obtained after spray drying;

[0047]Weigh 0.6g of intermediate powder and 0.3281g of glucose, grind and mix them uniformly, place them in a tube furnace at 600°C and Ar atmosphere for 12h, set the heating rate to 4°C / min, and obtain ytterbium-doped lithium titanium phosphate / carbon after cooling. Composite material, abbreviated as LiYb0.08Ti1.94(PO4)3 / C (denoted as LYTP0.08 / C-600) composite material.

[0048]Analyze the ...

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Abstract

The invention relates to a rare earth metal or transition metal doped lithium titanium phosphate / carbon composite material and a preparation method and application thereof. The composite material is an ytterbium-doped lithium titanium phosphate / carbon composite material or a manganese-doped lithium titanium phosphate / carbon composite material. The ytterbium-doped lithium titanium phosphate / carboncomposite material is a LiYbxTi2-0.75x (PO4) 3 / C composite material, wherein x ranges from 0.01 to 0.08; the manganese-doped lithium titanium phosphate / carbon composite material is a Li5Mn0.1Ti0.95(PO4)3 / C composite material. The composite material disclosed by the invention is obtained by adopting spray drying and compounding with an organic carbon source, and a contact interface between the composite material prepared by the method disclosed by the invention and an electrolyte of a lithium ion battery is more stable, so that the lithium ion battery can show high specific capacity, good cycling stability, excellent rate capability and coulombic efficiency.

Description

Technical field[0001]The invention relates to the technical field of lithium ion battery electrode materials, in particular to a lithium titanium phosphate / carbon composite material doped with rare earth metals or transition metals, and a preparation method and application thereof.Background technique[0002]At present, the problem of energy demand and environmental pollution is becoming more and more serious, which has also led to the widespread use of new energy sources, such as solar energy and tidal energy. However, due to its intermittent and variability characteristics, new energy sources hinder efficient and reasonable utilization. Fast-charging, long-life, and low-cost energy storage devices are worthy of further exploration. Lithium-ion batteries are a type of secondary energy battery and are the mainstream mobile energy storage devices. Rechargeable and portable lithium-ion batteries are widely used in electronic equipment and hybrids. Power cars, etc. Secondary energy batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 孙丽侠胡佳艳李晶晶宋忠诚邱滢
Owner JIANGSU UNIV OF TECH
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