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Preparation method of flower-like lithium titanate-titanium dioxide composite electrode material

A composite electrode and flower-shaped technology, applied in the field of new energy materials, can solve the problems of fast capacity decay, low specific capacity, poor rate performance, etc., and achieve the effect of short diffusion path, high specific capacity and good stability

Inactive Publication Date: 2016-04-13
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, this application will solve Li 4 Ti 5 o 12 Due to the technical problems of rapid capacity decay, poor rate performance, and relatively low specific capacity when the material is charged and discharged at a high current density, a flower-shaped lithium titanate-titanium dioxide (Li 4 Ti 5 o 12 -TiO 2 ) preparation method of composite electrode material

Method used

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  • Preparation method of flower-like lithium titanate-titanium dioxide composite electrode material
  • Preparation method of flower-like lithium titanate-titanium dioxide composite electrode material
  • Preparation method of flower-like lithium titanate-titanium dioxide composite electrode material

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Experimental program
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Effect test

Embodiment 1

[0038] a. Under magnetic stirring, add potassium titanium oxalate into n-hexane to form a uniform solution, so that the concentration of titanium ions in it is 0.1mol / L;

[0039] B. Take sodium lauryl sulfate and dissolve it in deionized water, so that the concentration of sodium lauryl sulfate is 0.023mol / L;

[0040] C, take by weighing lithium oxalate, be dissolved in the aqueous solution of step (b) gained under magnetic stirring, make wherein the concentration of lithium ion be 0.07mol / L;

[0041] d. Under magnetic stirring, slowly add the lithium-containing aqueous solution obtained in step (c) to the titanium-containing solution obtained in step (a);

[0042] e. Transfer the mixed solution obtained in step (d) to a polytetrafluoroethylene-lined stainless steel reaction kettle, seal it, place it in an oven, and react at 100° C. for 72 hours.

[0043] f. After the reaction, cool to room temperature, wash the obtained white precipitate several times with deionized water an...

Embodiment 2

[0046] a. Under magnetic stirring, add butyl titanate to toluene to form a uniform solution, so that the concentration of titanium ions in it is 0.28mol / L;

[0047] b. Take cetyltrimethylammonium bromide and dissolve it in deionized water, so that the concentration of cetyltrimethylammonium bromide is 0.55mol / L;

[0048] c, take lithium acetate and lithium hydroxide, dissolve in the aqueous solution of step (b) gained under magnetic stirring, make wherein the concentration of lithium ion be 1.2mol / L;

[0049] d. Under magnetic stirring, slowly add the lithium-containing aqueous solution obtained in step (c) to the titanium ion-containing solution obtained in step (a);

[0050] e. Transfer the mixed liquid obtained in step (d) to a polytetrafluoroethylene-lined stainless steel reaction kettle, seal it, place it in an oven, and react at 110° C. for 60 hours.

[0051] f. After the reaction, cool to room temperature, wash the obtained white precipitate several times with deionize...

Embodiment 3

[0054] a. Under magnetic stirring, add titanyl sulfate to propylene oxide to form a uniform solution, so that the concentration of titanium ions is 4mol / L;

[0055] b. Weigh the alkylphenol polyoxyethylene (10) ether and dissolve it in deionized water, so that the concentration of the alkylphenol polyoxyethylene (10) ether is 1mol / L;

[0056] c, take lithium hydroxide by weighing, be dissolved in the aqueous solution of step (b) gained under magnetic stirring, make wherein the concentration of lithium ion be 3.8mol / L;

[0057] d. Under magnetic stirring, slowly add the lithium-containing aqueous solution obtained in step (c) to the titanium-containing solution obtained in step (a);

[0058] e. Transfer the mixed solution obtained in step (d) to a polytetrafluoroethylene-lined stainless steel reaction kettle, seal it, place it in an oven, and react at 200° C. for 36 hours.

[0059] f. After the reaction, cool to room temperature, wash the obtained white precipitate several tim...

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Abstract

The invention discloses a preparation method of a flower-like lithium titanate-titanium dioxide (Li<4>Ti<5>O<12>-TiO<2>) composite electrode material. The method comprises the following steps: (a) adding a titanium source to an organic solvent under agitation to obtain a titanium-containing solution; (b) dissolving the taken surfactant into deionized water; (c) weighing a lithium source, and dissolving the lithium source into the water solution obtained in the step (b) to obtain a lithium-containing water solution; (d) adding the lithium-containing water solution obtained in the step (c) to the titanium-containing solution obtained in the step (a) under agitation to obtain a mixed solution; (e) transferring the mixed solution obtained in the step (d) into a reaction kettle for reaction; (f) cooling the product to a room temperature after reaction is ended, washing the obtained sediments, and drying the sediments to obtain white powder; and (g) roasting the white powder obtained in the step (f) to prepare the flower-like lithium titanate-titanium dioxide composite electrode material. The Li<4>Ti<5>O<12>-TiO<2> composite material with a flower-like structure prepared by the method has relatively large specific surface area and pore volume and is good in rate charge-discharge performance; the preparation method has the advantages of being simple in process, low in energy consumption and the like; and the shape and the dimension of a product are easy to control.

Description

technical field [0001] The application belongs to the technical field of new energy materials, in particular, it relates to a flower-shaped lithium titanate-titanium dioxide (Li 4 Ti 5 o 12 -TiO 2 ) preparation method of composite electrode material. Background technique [0002] spinel lithium titanate (Li 4 Ti 5 o 12 ) has a high electrode potential (1.55Vvs.Li + / Li), it is not easy to cause the generation of lithium dendrites, and has excellent safety; in addition, in the process of charging and discharging, Li 4 Ti 5 o 12 The volume hardly changes and has very excellent cycle stability. Therefore, Li 4 Ti 5 o 12 It is considered to be a very promising anode material for power batteries and has attracted extensive attention from researchers. However, since Li 4 Ti 5 o 12 The intrinsic electronic conductivity of the material (<10 -13 S cm -1 ) and lithium ion diffusion coefficient (10 -9 -10 -13 cm 2 ·s -1 ) is low, so that the capacity decays fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/483H01M4/485H01M10/0525Y02E60/10
Inventor 刘光印郭佳莉赵强孙瑞雪毛武涛张瑞雪柳文敏谢海泉季晓广
Owner NANYANG NORMAL UNIV
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