High-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material and preparation method thereof

A carbon nanofiber and negative electrode material technology, applied in the field of lithium battery negative electrode materials, can solve the problems of low rate performance of lithium deintercalation and intercalation kinetics, large specific surface area of ​​nanomaterials, and many dangling and unsaturated bonds on the surface. It is beneficial to the intercalation of lithium ions and the transmission of electrons, the effect of increasing specific capacity and high loading capacity

Inactive Publication Date: 2018-07-31
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low electronic conductivity (10-13~10-17S / cm) of TiO2-type negative electrode materials leads to low rate performance and intercalation kinetics in the actual deintercalation process.
In addition, a single nanomaterial has a large specific surface area, but there are many unsaturated bonds such as surface dangling bonds, resulting in a large surface energy.

Method used

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  • High-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material and preparation method thereof
  • High-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material and preparation method thereof
  • High-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material and preparation method thereof

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Embodiment 1

[0056] The invention discloses a method for preparing a high-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material, comprising the following steps:

[0057] S1. Add 0.32g of polyvinylpyrrolidone powder into 5mL of ethanol, stir to obtain solution A; use a pipette gun to accurately measure 4mL of isopropyl titanate, then add 2mL of glacial acetic acid and 1mL of ethanol, mix and stir to obtain solution B; Slowly add B into solution A. After the addition, stir for 10 minutes to obtain a mixture of the two; after the mixture is naturally cooled to room temperature, add 0.3 g of vanadyl acetylacetonate powder to it, and ultrasonically disperse until the powder is completely mixed to obtain a shell spinning solution;

[0058] The shell spinning solution is poured into the outer channel, liquid paraffin is poured into the inner channel, the electric field strength is kept at 2kV / cm, the flow rates of the inner and outer phases are 0.1mL / h and 0....

Embodiment 2

[0065] The invention discloses a method for preparing a high-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material, comprising the following steps:

[0066] S1. Dissolve 0.4g of polyvinylpyrrolidone powder in 10mL of ethanol, stir to obtain solution A; use a pipette to accurately measure 6mL of isopropyl titanate, then add 4mL of glacial acetic acid and 2mL of ethanol, mix and stir to obtain solution B; Slowly add solution B into solution A, and after the addition, stir for 10 minutes to obtain a mixture of the two; after the mixture is naturally cooled to room temperature, add 0.3 g of vanadyl acetylacetonate powder to it, and ultrasonically disperse until the powders are completely mixed to obtain Shell spinning solution.

[0067] The shell spinning solution is poured into the outer channel, the paraffin oil is poured into the inner channel, the electric field strength is kept at 2kV / cm, the flow rates of the inner and outer phases are 0...

Embodiment 3

[0073] The invention discloses a method for preparing a high-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material, comprising the following steps:

[0074] S1. Dissolve 0.50g of polymethyl methacrylate powder into 5mL of acrylic acid, stir to obtain solution A; use a pipette to accurately measure 4mL of n-butyl titanate, then add 2mL of acetylacetone and 1mL of ethanol, mix and stir to obtain a solution B; slowly add solution B to solution A, after the addition, stir for 30 minutes to obtain a mixture of the two; after the mixture is naturally cooled to room temperature, add 0.3g of vanadyl oxalate powder to it, ultrasonically disperse until the powder is completely mixed, A shell spinning solution was obtained.

[0075] The shell spinning solution is poured into the outer channel, the paraffin oil is poured into the inner channel, the electric field strength is kept at 2.5kV / cm, the flow rates of the inner and outer phases are 0.6mL / h an...

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Abstract

The invention discloses a high-capacity TiO2-VO2-doped hollow carbon nanofiber lithium battery negative electrode material and a preparation method thereof. The high-capacity TiO2-VO2-doped hollow carbon nanofiber lithium battery negative electrode material comprises 10-80.0 wt% of TiO2 nanoparticles and 0.1-20.0 wt% of VO2 nanoparticles coating the outer surface of the hollow carbon nanofiber andbalance of hollow carbon nanofiber; and the high-capacity TiO2-VO2-doped hollow carbon nanofiber lithium battery negative electrode material has multi-stage pore structure and high load, is beneficial to electrolyte in-penetration, and is conducive to lithium ion embedding and electron transport. The conductivity, specific capacity and stability of the negative electrode material are improved, and the negative electrode material has excellent rate performance and cycle performance.

Description

technical field [0001] The invention relates to the field of lithium battery negative electrode materials, in particular to a high-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high voltage, long life, and high energy density. Since Japan's Sony Corporation launched the first generation of lithium-ion batteries in 1990, it has developed rapidly and is widely used in various portable devices, involving 3C products, power devices, energy storage equipment and other fields. Due to the vigorous development of new energy vehicles, the demand for power batteries is increasing. The basis of power batteries is negative electrode materials with excellent charge and discharge performance. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/587H01M10/0525Y02E60/10
Inventor 赵亚张芳芳刘桐桐杨冬生翟博刘俊军
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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