PEDOT-coated lithium titanate nano particles preparation method and application thereof

A nanoparticle, lithium titanate technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high cost and complex application process, and achieve the effects of high rate performance, easy collection, and simple preparation method.

Inactive Publication Date: 2018-06-29
SHEYANG RES INST OF NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: The purpose of the invention is to provide a preparation method of lithium titanate nanoparticles coated with PEDOT, which solves the problem of complex application process and high cost of poly-3,4-ethylenedioxythiophene in lithium battery negative electrode materials. question

Method used

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  • PEDOT-coated lithium titanate nano particles preparation method and application thereof
  • PEDOT-coated lithium titanate nano particles preparation method and application thereof
  • PEDOT-coated lithium titanate nano particles preparation method and application thereof

Examples

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Embodiment 1

[0022] Example 1: Accurately weigh 1.35g of titanium dioxide nanoparticles and 0.32g of lithium hydroxide and place them in a planetary ball mill, and ball mill them at a speed of 1500 rpm for 18 hours; the obtained mixture is placed in a tube furnace, and the heating rate of calcination is 1 ℃ / min, calcined at 500℃ for 36h under air condition, cooled to room temperature to obtain lithium titanate nanoparticles; accurately weigh 0.10g of 3,4-ethylenedioxythiophene monomer (EDOT), add 24mL of deionized Water, sonicated at a frequency of 20KHz for 30 minutes; accurately weighed 0.60g of lithium titanate nanoparticles obtained, added to the EDOT dispersion, ultrasonicated at a frequency of 60KHz for 1h, and then continuously stirred at a speed of 1000rpm for 2h to obtain a mixed solution The ammonium persulfate (APS) of 0.24g and the hydrochloric acid (HCl) that 35mg mass fraction are 37wt.% are dissolved in the deionized water of 35mL, stir well, add in the above-mentioned mixed ...

Embodiment 2

[0023] Example 2: Accurately weigh 3.99g of titanium dioxide nanoparticles and 1.66g of lithium carbonate, place them in a planetary ball mill, and ball mill them at a speed of 3000 rpm for 6 hours; place the obtained mixture in a tube furnace, and calcinate at a heating rate of 5°C / min, calcined at 800°C for 10h under air conditions, cooled to room temperature, and obtained lithium titanate nanoparticles; accurately weighed 0.10g of EDOT, added 20mL of deionized water, and ultrasonicated at a frequency of 60KHz for 1h; accurately weighed to obtain 1.00g of lithium titanate nanoparticles was added to the EDOT dispersion liquid, ultrasonicated at a frequency of 40KHz for 1h, and then continuously stirred at a speed of 800 rpm for 3h to obtain a mixed solution; % HCl was dissolved in 44 mL of deionized water, stirred evenly, added to the mixed solution obtained above, stirred at room temperature at a speed of 700 rpm for 6 hours, and the obtained mixed solution was centrifuged a...

Embodiment 3

[0024]Example 3: Accurately weigh 3.99g of titanium dioxide nanoparticles and 2.93g of lithium nitrate, place them in a planetary ball mill, and ball mill them at a speed of 2000 rpm for 24 hours; place the obtained mixture in a tube furnace, and calcinate at a heating rate of 3°C / min, calcined at 1000°C for 48h under air conditions, cooled to room temperature, and obtained lithium titanate nanoparticles; accurately weighed 0.11g of EDOT, added 20mL of deionized water, and ultrasonicated at a frequency of 40KHz for 0.8h; accurately weighed 0.25 g of the obtained lithium titanate nanoparticles was added to the EDOT dispersion liquid, and after ultrasonication at a frequency of 20 KHz for 30 minutes, stirring was continued at a speed of 500 rpm for 4 h to obtain a mixed solution; 0.18 g of APS and 29 mg of mass fraction were 37wt.% HCl was dissolved in 20 mL of deionized water, stirred evenly, added to the mixed solution obtained above, stirred at 800 rpm for 18 hours at room te...

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Abstract

The invention discloses a PEDOT-coated lithium titanate nano particles preparation method and an application thereof. The preparation method comprises the following steps: grinding a lithium source and titanium dioxide nano particles, performing high-temperature calcining to obtain the lithium titanate nano particles; preparing a 3,4-ethylenedioxythiophene disperse aqueous solution, adding the prepared lithium titanate nano particles in the disperse aqueous solution, and uniformly dispersing the materials; adding ammonium persulfate and hydrochloric acid in the disperse solution, and stirringthe materials; performing centrifugation on mixed liquor, washing an obtained precipitate, and drying the precipitate to obtain the 3,4-coated lithium titanate nano particles. The method guarantees excellent performance of the product, simplifies the technology, reduces cost, and is suitable for large scale. The prepared PEDOT-coated lithium titanate nano particles can be used for a negative polepiece of a lithium battery, and has the advantages of excellent cycle performance, high efficiency and high magnification performance.

Description

technical field [0001] The invention belongs to the technology of chemical power sources, and in particular relates to a preparation method and application of lithium titanate nanoparticles coated with conductive polymers as negative electrode materials of lithium ion batteries. Background technique [0002] With the full popularity of various portable electronic devices and the depletion of fossil fuels as traditional vehicle energy sources, lithium-ion batteries have gained global popularity due to their advantages such as high energy, high voltage, no pollution, long life, and no memory effect. Promote vigorously. From the perspective of the lithium battery market structure, lithium-ion batteries have already occupied a dominant position in the direction of the electronic product market, and are developing vigorously in the direction of power batteries. However, for power batteries, the charging current is generally only 0.1C-0.2C, and the charging time is long (5-10 hou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/36
CPCH01M4/1391H01M4/366Y02E60/10
Inventor 周东山万远鑫徐晓茜宋海媚王立杰薛奇王晓亮江伟陈葳季青
Owner SHEYANG RES INST OF NANJING UNIV
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