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

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

Active Publication Date: 2022-02-11
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 titanium lithium phosphate/carbon composite material and its preparation method and application
  • Rare earth metal or transition metal doped titanium lithium phosphate/carbon composite material and its preparation method and application
  • Rare earth metal or transition metal doped titanium lithium phosphate/carbon composite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0036] The preparation method of ytterbium-doped titanium lithium phosphate / carbon composite material comprises the steps of: respectively weighing 0.25g of lithium hydroxide, 3.57g of ammonium dihydrogen phosphate, and 11.85g of two (2-hydroxypropionic acid) dihydroxide Diammonium titanium, 0.1833g of ytterbium nitrate, add 300mL of deionized water and magnetically stir for 0.5h to obtain a mixed solution; the mixed solution is spray-dried, spray-dried with a spray dryer, and the parameter settings of the spray dryer are: outlet temperature 100°C, peristaltic pump speed 15r / min, spray dry to get intermediate powder;

[0037] Weigh 0.6g of intermediate powder and 0.3281g of anhydrous citric acid, grind and mix evenly, place in a tube furnace at 600°C and Ar atmosphere for sintering for 12h, set the heating rate at 4°C / min, and obtain ytterbium-doped titanium phosphate after cooling Lithium / carbon composite material, abbreviated as LiYb 0.04 Ti 1.97 (PO 4 ) 3 / C (denoted as...

Embodiment 2

[0040] The preparation method of ytterbium-doped titanium lithium phosphate / carbon composite material comprises the steps of: respectively weighing 0.25g of lithium hydroxide, 3.57g of ammonium dihydrogen phosphate, and 11.85g of two (2-hydroxypropionic acid) dihydroxide Diammonium titanium, 0.1833g of ytterbium nitrate, add 300mL of deionized water and magnetically stir for 0.5h to obtain a mixed solution; the mixed solution is spray-dried, spray-dried with a spray dryer, and the parameter settings of the spray dryer are: outlet temperature 100°C, peristaltic pump speed 15r / min, spray dry to get intermediate powder;

[0041] Weigh 0.6g of intermediate powder and 0.3281g of anhydrous citric acid, grind and mix evenly, place in a tube furnace at 700°C and Ar atmosphere for sintering for 12h, set the heating rate at 4°C / min, and obtain ytterbium-doped titanium phosphate after cooling Lithium / carbon composite material, abbreviated as LiYb 0.04 Ti 1.97 (PO 4 ) 3 / C (denoted as...

Embodiment 3

[0046] The preparation method of ytterbium-doped titanium lithium phosphate / carbon composite material comprises the steps of: respectively weighing 0.25g of lithium hydroxide, 3.57g of ammonium dihydrogen phosphate, and 11.65g of two (2-hydroxypropionic acid) dihydroxide Diammonium titanium alloy, 0.3680g ytterbium nitrate, add 300mL deionized water and carry out magnetic stirring for 0.5h to obtain a mixed solution; spray the mixed solution and use a spray dryer to spray dry, the parameter setting of the spray dryer: outlet temperature 100°C, peristaltic pump speed 15r / min, spray dry to get intermediate powder;

[0047] Weigh 0.6g of intermediate powder and 0.3281g of glucose, grind and mix evenly, place in a tube furnace at 600°C and Ar atmosphere for sintering for 12h, set the heating rate at 4°C / min, and obtain ytterbium-doped lithium titanium phosphate / carbon after cooling Composite material, abbreviated as LiYb 0.08 Ti 1.94 (PO 4 ) 3 / C (denoted as LYTP0.08 / C-600) co...

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Abstract

The present invention relates to rare earth metal or transition metal doped titanium lithium phosphate / carbon composite material and its preparation method and application. The composite material is ytterbium doped titanium lithium phosphate / carbon composite material or manganese doped titanium lithium phosphate / carbon composite material Material; the ytterbium-doped lithium titanium phosphate / carbon composite material is LiYb x Ti 2‑0.75x (PO4) 3 / C composite material, wherein the value range of x is 0.01~0.08; the manganese-doped lithium titanium phosphate / carbon composite material is Li 5 mn 0.1 Ti 0.95 (PO 4 ) 3 / C Composite. The composite material of the present invention is obtained by spray drying and compounding with an organic carbon source. The contact interface between the composite material prepared by the method of the present invention and the electrolyte of the lithium-ion battery is more stable, and the lithium-ion battery can show high specific capacity. Good cycle stability and excellent rate performance, 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 its preparation method and application. 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 the intermittency and variability of new energy sources, efficient and reasonable utilization is hindered. Fast-charging, long-life, and low-cost energy storage devices are worthy of further exploration. Lithium-ion batteries are a type of secondary energy batteries and mainstream mobile energy storage devices. Rechargeable and portable lithium-ion batteries are widely used in electronic equipment and hybrid Power cars, etc. Secondary energy batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(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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