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Doped lithium ion battery anode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in the field of materials, can solve the problems of reducing the coulombic efficiency of materials and limited conductivity of materials, and achieve the effects of universal applicability, uniform size, and wide controllable selection range.

Inactive Publication Date: 2015-11-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the conductivity of the material by carbon coating is limited, and it will reduce the Coulombic efficiency of the material

Method used

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  • Doped lithium ion battery anode material and preparation method thereof
  • Doped lithium ion battery anode material and preparation method thereof
  • Doped lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Ultrasonic dispersion

[0031] Take 1.5426g of Nb 2 o 5 and 0.4403 g of TiO 2 and 0.01479g of Al 2 o 3 Separately disperse in n-hexane submerged in materials, ultrasonically and stir evenly, then mix, continue ultrasonically and stir for 2 hours to obtain a uniformly dispersed solution.

[0032] (2) Ball milling

[0033] The obtained solution was poured into a ball mill tank, and the spherical mass ratio was adjusted to 25:1, and ball milled in a planetary high-energy ball mill at a speed of 300 rpm for 10 h, and the remaining powder was collected after the slurry was blast-dried.

[0034] (3) High temperature heat treatment

[0035] The collected samples were treated at 1000°C for 30 hours in an air atmosphere to prepare the lithium-ion battery anode material Ti 0.95 al 0.05 Nb 2 o 7 .

[0036] The morphology of the material prepared in this example with 5% Al instead of Ti is as follows figure 1 As shown, it can be seen that the morphology of the mater...

Embodiment 2

[0039] (1) Dispersion solution

[0040] Weigh 3.1289g of NbCl 5 and 1.9689g of tetrabutyl titanate were respectively dispersed in 200mL of absolute ethanol, and mixed with ultrasonication and stirring evenly, and continued ultrasonication and stirring for 2 hours to obtain a uniformly dispersed solution.

[0041](2) Adjust the pH and stir to form a gel

[0042] Glacial acetic acid was added to the obtained solution to adjust the pH to 2-5, and then heated and stirred in an oil bath with the temperature controlled at 50°C until a sol was obtained.

[0043] (3) Drying to prepare xerogel

[0044] Transfer the sol to a blast drying oven, adjust the temperature to 50-100°C until the sol turns into a gel, then adjust the temperature to 80-160°C, and dry to obtain a xerogel.

[0045] (4) High temperature heat treatment

[0046] Grind the xerogel obtained in Step 3 finely, then put the material into a quartz crucible and transfer it to a tube furnace, heat it up to 900°C in an air...

Embodiment 3

[0049] (1) Dispersion solution

[0050] Weigh 0.9750g of tetrabutyl titanate, 0.8142g of isopropyl titanate and 1.5492g of Nb 2 (C 2 o 4 ) 5 and 1.8324g of Nb(C 2 h 5 O) 5 , 0.0110g of zinc oxalate and 0.0088g of copper oxalate were respectively dispersed in 200mL of absolute ethanol, ultrasonically and stirred evenly, and then mixed, and continued ultrasonically and stirred for 2 hours to obtain a uniformly dispersed solution.

[0051] (2) Adjust the pH and stir to form a gel

[0052] Glacial acetic acid was added to the obtained solution to adjust the pH to 2-5, and then heated and stirred in an oil bath with the temperature controlled at 50°C until a sol was obtained.

[0053] (3) Drying to prepare xerogel

[0054] The sol was transferred to a blast drying oven, and the temperature was adjusted to 80° C. until the sol turned into a gel, and then the temperature was adjusted to 160° C., and dried to obtain a xerogel.

[0055] (4) High temperature heat treatment

[...

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Abstract

The invention discloses a doped lithium ion battery anode material and a preparation method thereof. The structural formula of the anode material is Ti<x>Nb<y>M<z>O7; in the formula, x is more than or equal to 0.5 and less than or equal to 1.5; y is more than or equal to 1.5 and less than or equal to 2.5; z is more than or equal to 0 and less than or equal to 0.5; furthermore, x+y+z=3; and M is one or more selected from a group including Al, Fe, Mg, Zn and Cu. According to the invention, a TiNb2O7 material is doped and modified by adopting a solid phase method or a liquid phase method; the defect concentration of the material is increased by increasing the mixed arrangement degree of metal atoms, so that the electrical conductivity of the material is improved; the method is applicable to large-scale production; the technological process is simple and easy to do; the electrochemical properties of the obtained material are excellent; the particle size of the material prepared through the solid phase method is uniform and distributed within 800-1000 nm; furthermore, the dispersibility is good; and the material obtained through the liquid phase method has a porous structure.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a doped lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] As a green and environmentally friendly chemical power source widely used in 3C equipment, lithium-ion batteries have the advantages of high voltage, long cycle life, good safety, small self-discharge, and fast charge and discharge. Materials for batteries present new requirements for high specific energy and high power. At present, the carbon anode materials widely used in power batteries have gradually been unable to meet this requirement, and are expected to replace traditional carbon materials used in power batteries as "zero strain" materials-Li 4 Ti 5 o 12 Its application is limited by its low theoretical specific capacity (175mAh / g). TiNb 2 o 7 As a new lithium-ion battery anode material, it has the advantages of high specific energy and high specif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/62
CPCH01M4/362H01M4/483H01M4/523H01M4/626H01M10/0525Y02E60/10
Inventor 程新群高金龙娄帅锋林春华左朋建杜春雨尹鸽平
Owner HARBIN INST OF TECH
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