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Preparation of rare earth metal doped nano lithium titanate by electrospinning

A nano-lithium titanate, electrospinning technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of particle agglomeration, inability to form a gel three-dimensional network structure, poor electrochemical performance, etc., to improve the particle size. The effect of agglomeration, electrochemical performance improvement, and conductivity improvement

Inactive Publication Date: 2016-03-02
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional sol-gel synthesis process, there is a certain particle agglomeration phenomenon, and the ideal three-dimensional gel network structure cannot be formed. The size of the specific surface area and the dispersion degree of the active ingredient are limited by the agglomeration phenomenon. Poor electrochemical performance

Method used

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  • Preparation of rare earth metal doped nano lithium titanate by electrospinning
  • Preparation of rare earth metal doped nano lithium titanate by electrospinning
  • Preparation of rare earth metal doped nano lithium titanate by electrospinning

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Put 0.6g of polyvinylpyrrolidone (PVPK90) into 9mL of absolute ethanol and stir until completely dissolved. According to the molar ratio of Li:Ti=4.2:5, 1.702g of tetra-n-butyl titanate and 0.277g of lithium acetate were put into the obtained polymer solution, and 1.778g of citric acid was added at the same time, and stirred until the solution was clear. Obtain solution A; according to the molar ratio of La:Ti=0.02:5, add 0.0033g of lanthanum oxide into 3mL of nitric acid and completely dissolve to obtain solution B. Mix solution A and solution B, stir at room temperature for 2 hours, add 0.1 mL of 1-methyl-2-pyrrolidone and continue stirring at room temperature for 1.5 hours to obtain an electrospinning solution. The parameters of the electrospinning process were selected as follows: the flow rate was 0.3mL / hr, the working voltage was 15KV, and the distance between the receiving plates was 15cm. Electrospinning was carried out. After spinning a 2mm white film, it was v...

Embodiment 2

[0029] Put 2.48g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (PluronicP123) into 17.73mL of absolute ethanol, and stir until completely dissolved. Then according to the molar ratio of Li:Ti=1:1, 1.702g of tetra-n-butyl titanate and 0.345g of lithium nitrate were put into the prepared polymer solution, and 2.260g of triethanolamine was added at the same time, and stirred until the solution was clear. Obtain solution A; according to the molar ratio of Nd:Ti=0.1:5, add 0.0168g of neodymium oxide into 7.09mL of acetic acid to completely dissolve and obtain solution B. Mix solution A and solution B, stir at room temperature for 3 hours, add 0.50 mL of dichloromethane and continue stirring at room temperature for 1 hour to obtain an electrospinning solution. The electrospinning process parameters were selected as follows: the flow rate was 1.0mL / hr, the working voltage was 15KV, and the receiving plate distance was 30cm. Electrospinning was performed. Afte...

Embodiment 3

[0031] Put 4.04g of polyvinyl butyral into 13.46mL of absolute ethanol and stir until completely dissolved. According to the molar ratio of Li:Ti=4.8:5, Gd:Ti=0.001:5, 1.421g of tetraisopropyl titanate, 0.178g of lithium carbonate, and 0.0004g of gadolinium nitrate were put into the prepared polymer solution, Add 6.73 mL of hydrochloric acid and stir until the solution is clear. Finally, 0.30 mL of acetone was added and stirring was continued at room temperature for 1 hour to obtain an electrospinning solution. The parameters of the electrospinning process were selected as follows: the flow rate was 0.2mL / hr, the working voltage was 10KV, and the distance between the receiving plates was 10cm. Electrospinning was performed. After spinning a 1mm white film, it was vacuum-dried and stabilized at room temperature for 6 hours. The film was removed and calcined at a high temperature of 700° C. for 15 hours in a tube furnace under a nitrogen atmosphere to obtain a gadolinium-doped ...

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Abstract

The invention discloses an electrostatic spinning method for preparing a rare-earth metal doped nanometer lithium titanate. The electrostatic spinning method comprises the following steps: preparing a Li4Ti5O12 precursor gel according to a sol gel method; doping rare-earth metal ions and covering carbon on the Li4Ti5O12 precursor gel; after electro-statically spinning, obtaining a nanometer fiber Li4Ti5O12 precursor; and calcining at high temperature under an anaerobic condition, thereby synthesizing a Li4Ti5O12 / C fiber. According to the electrostatic spinning method provided by the invention, the nanometer lithium titanate is synthesized on a nanometer carbon fiber skeleton; the particle aggregation is effectively prevented; a carbon covering effect is also achieved by the nanometer carbon fiber skeleton; the rare-earth metal is taken as a doping agent, so that the electrical conductivity of the material is improved and the increase of the electrochemical property under high multiplying power is realized; the obtained cathode material has a better electrochemical property; higher discharging capacity is obtained under the condition of high multiplying power charging / discharging; and the cycle performance is also stable.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion secondary battery negative electrode material, in particular to a preparation method of a lithium ion secondary battery negative electrode material nano lithium titanate fiber. Background technique [0002] In 1991, Sony Corporation of Japan released the world's first lithium-ion battery, and then lithium-ion batteries began to be widely used in emerging civilian electronic products, such as mobile phones, cameras, notebook computers and other portable electronic products. By 1997, lithium-ion batteries Batteries have captured the largest market share for rechargeable batteries. At present, most of the anode materials used in commercially available lithium-ion batteries are carbon materials, but such anode materials have certain safety hazards. When the battery is fast charged or overcharged, metal lithium will be precipitated on the surface of the electrode material and form dendrites to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62D01D5/00
CPCY02E60/10
Inventor 张遥遥张春明王丹吴晓燕余震汪元元何丹农
Owner SHANGHAI JIAOTONG UNIV
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