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Preparation method of rare-earth-doped lithium titanate ultrathin nanosheet negative electrode material

A negative electrode material and rare earth doping technology, which is applied in the field of preparation of rare earth doped lithium titanate ultra-thin nanosheet negative electrode materials, can solve the problems of improving electrical conductivity, complicated process, high cost and energy consumption, and achieves uniform distribution and process. The effect of simple, excellent capacity performance

Inactive Publication Date: 2019-03-08
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the preparation process, such as complex process, high cost and energy consumption caused by the use of nitrogen, and the use of soluble compounds of metal M cannot regulate the valence state of titanium ions in the lithium titanate lattice and improve its conductivity.

Method used

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  • Preparation method of rare-earth-doped lithium titanate ultrathin nanosheet negative electrode material
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  • Preparation method of rare-earth-doped lithium titanate ultrathin nanosheet negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0026] 1) Add 0.01mol of LiOH·H 2 O, 3ml of tetrabutyl titanate and 0.08mmol of CeCl 3 ·7H 2 Pour O into a beaker and ultrasonically disperse it in an ultrasonic machine for 20 minutes to make it evenly dispersed, then place it on a magnetic stirrer, add 15ml of ethanol and then 20ml of deionized water at 350r / min, and stir for 4 hours to obtain Mixed homogeneous suspension;

[0027] 2) Transfer the homogeneously mixed suspension in step 1 to a hydrothermal kettle, heat to 180°C, react for 48 hours, then cool to 25°C, and then use 80ml of ethanol to filter the suspension under the condition of suction Washing 3 times to remove the remaining impurities inside the material, the precursor of the modified lithium titanate negative electrode material can be obtained;

[0028] 3) vacuum-drying the modified lithium titanate negative electrode material precursor obtained in step 2 at 60° C., and then grinding it into powder;

[0029] 4) Heat the ground powder at a rate of 2°C / min ...

Embodiment 2

[0032] 1) Add 0.008mol of LiOH·H 2 O, 2ml of tetrabutyl titanate and 0.04mmol of LaCl 3 ·7H 2 Pour O into a beaker and ultrasonically disperse it in an ultrasonic machine for 30 minutes to make it evenly dispersed, then place it on a magnetic stirrer, add 25ml of ethanol and then 30ml of deionized water at 200r / min, and stir for 2 hours to get Mixed homogeneous suspension;

[0033] 2) Transfer the homogeneously mixed suspension in step 1) to a hydrothermal kettle, heat to 150°C, react for 24 hours, then cool to 23°C, and then use 40ml of the suspension under the condition of suction filtration Washing with ethanol twice to remove the residual impurities inside the material, the precursor of the modified lithium titanate negative electrode material can be obtained;

[0034]3) vacuum-drying the modified lithium titanate negative electrode material precursor obtained in step 2) at 50° C., and then grinding it into powder;

[0035] 4) Heat the ground powder at a rate of 5°C / mi...

Embodiment 3

[0037] 1) Add 0.012mol of LiOH·H 2 O, 4ml of tetrabutyl titanate and 0.1mmol of CeCl 3 ·7H 2 Pour O into a beaker and ultrasonically disperse it in an ultrasonic machine for 25 minutes to make it evenly dispersed, then place it on a magnetic stirrer, add 20ml of ethanol and then 25ml of deionized water at 400r / min, and stir for 3 hours to obtain Mixed homogeneous suspension;

[0038] 2) Transfer the homogeneously mixed suspension in step 1) to a hydrothermal kettle, heat to 160°C, react for 36 hours, then cool to 24°C, and then use 60ml of the suspension under the condition of suction filtration Washing with ethanol for 3 times to remove the remaining impurities inside the material, the precursor of the modified lithium titanate negative electrode material can be obtained;

[0039] 3) vacuum-drying the modified lithium titanate negative electrode material precursor obtained in step 2) at 80° C., and then grinding it into powder;

[0040] 4) Heat the ground powder at a rate...

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Abstract

The invention discloses a preparation method of a rare-earth-doped lithium titanate ultrathin nanosheet negative electrode material. The method comprises the steps of 1) mixing, dispersing and stirring 0.008-0.012 mol of LiOH.H2O, 2-4 ml of tetrabutyl titanate and 0.04-0.1 mmol of MCl3.7H2O to obtain turbid liquid, wherein M is one of La and Ce; 2) carrying out a hydrothermal reaction on the turbid liquid, and then carrying out suction filtration and washing so as to obtain a modified lithium titanate negative electrode material precursor; 3) carrying out vacuum drying, and then carrying out grinding to form powder; and 4) carrying out heat treatment on the ground powder to obtain the rare earth element M-doped lithium titanate nanosheet negative electrode material Li4Ti5-xMxO12. The method disclosed by the invention is simple in process, free of pre-sintering and gas protection, and easy for industrial production; and the prepared lithium titanate negative electrode material is high in yield, and also has excellent capacity performance, cycle performance and rate performance under high current density.

Description

technical field [0001] The invention relates to a preparation method of a rare earth-doped lithium titanate ultra-thin nano sheet negative electrode material. Background technique [0002] With the rapid development of electric vehicles, there is an urgent need to use reliable batteries with excellent electrochemical performance and high safety as the power system of electric vehicles. While the currently used LiCoO 2 The -graphite battery system uses graphite with a very low lithium intercalation potential as the negative electrode, so it is easy to generate lithium dendrites on the graphite surface and puncture the battery diaphragm, which poses a safety hazard. For this reason, lithium titanate has been extensively studied due to its many advantages. [0003] Lithium titanate, as a lithium battery negative electrode material, has the following advantages compared with traditional graphite: (1) High discharge voltage platform (1.55vs Li / Li + ) is much higher than the li...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/485H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 秦蒙李东剑李军飞李悦明赵少怀
Owner 桑顿新能源科技(长沙)有限公司
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