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Carbon nanofiber/lithium titanate composite electrode material as well as preparation method and application thereof

A carbon nanofiber, composite electrode technology, applied in titanate, nanocarbon, nanotechnology and other directions, can solve the problems of low conductivity and low power, and achieve the effect of large energy density, high specific capacity and low reaction temperature

Pending Publication Date: 2021-11-16
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above prior art, the present invention provides a carbon nanofiber / lithium titanate composite electrode material and its preparation method and application, so as to solve the technical problems of low electrical conductivity and low power of a single lithium titanate material

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  • Carbon nanofiber/lithium titanate composite electrode material as well as preparation method and application thereof
  • Carbon nanofiber/lithium titanate composite electrode material as well as preparation method and application thereof
  • Carbon nanofiber/lithium titanate composite electrode material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] A carbon nanofiber / lithium titanate composite electrode material, comprising a carbon nanofiber carrier and lithium titanate nanosheets loaded on the surface of the carbon nanofiber carrier; the carbon nanofiber carrier is a carbon helical nanofiber with a diameter of about 75nm, titanate The thickness of the lithium nanosheet loaded on the carrier is about 200nm.

[0036] The carbon nanofiber / lithium titanate composite electrode material in this embodiment is prepared through the following steps:

[0037] (1) Take the cleaned copper sheet (2cm×2cm) as the working electrode, the platinum sheet (2cm×2cm) as the counter electrode, and the 0.1mol / L copper sulfate aqueous solution as the electrolyte, adjust the pH value of the solution to 1, and the cathode working current Density is 0.5A / g, copper nanoparticle catalyst is prepared after 30 seconds of constant current reaction; The copper nanoparticle that obtains is carried out scanning electron microscope analysis, as fi...

Embodiment 2

[0041] A carbon nanofiber / lithium titanate composite electrode material, comprising a carbon nanofiber carrier and lithium titanate nanosheets loaded on the surface of the carbon nanofiber carrier; the carbon nanofiber carrier is a carbon helical nanofiber with a diameter of about 150 nm, titanate The thickness of the lithium nanosheet loaded on the carrier is about 100nm.

[0042] The carbon nanofiber / lithium titanate composite electrode material in this embodiment is prepared through the following steps:

[0043] (1) Take the cleaned copper sheet (2cm×2cm) as the working electrode, the platinum sheet (2cm×2cm) as the counter electrode, and the 0.25mol / L copper sulfate aqueous solution as the electrolyte, adjust the pH value of the solution to 2.5, and the cathode operating current The density is 1.5A / g, and the copper nanoparticle catalyst is prepared after constant current reaction for 60 seconds;

[0044](2) the copper nanoparticle catalyst that step (1) is made is placed...

Embodiment 3

[0047] A carbon nanofiber / lithium titanate composite electrode material, comprising a carbon nanofiber carrier and lithium titanate nanosheets loaded on the surface of the carbon nanofiber carrier; the carbon nanofiber carrier is a carbon helical nanofiber with a diameter of about 200 nm, titanate The thickness of the lithium nanosheet loaded on the carrier is about 300nm.

[0048] The carbon nanofiber / lithium titanate composite electrode material in this embodiment is prepared through the following steps:

[0049] (1) The copper nanoparticle catalyst was prepared by electrochemical deposition as follows: a cleaned copper sheet (2cm×2cm) was used as the working electrode, a platinum sheet (2cm×2cm) was used as the counter electrode, and 0.5mol / L copper sulfate aqueous solution was used as the electrolyte , the pH value of the control solution is 5, the cathode working current density is 2A / g, and the copper nanoparticle catalyst is prepared after 90 seconds of constant current...

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Abstract

The invention discloses a carbon nanofiber / lithium titanate composite electrode material as well as a preparation method and application thereof. The preparation method specifically comprises the following steps of: (1) taking a copper sheet as a positive electrode and a platinum sheet as a negative electrode, soaking the positive electrode and the negative electrode in a copper sulfate aqueous solution, and preparing copper nanoparticles by an electro-deposition method; (2) preparing carbon spiral nanofibers by taking the copper nanoparticles as a catalyst and acetylene as a carbon source through a plasma chemical vapor deposition method; (3) by taking the carbon spiral nanofibers as a carrier and titanium tetrachloride and deionized water as reaction sources, depositing a layer of uniform titanium dioxide on the surfaces of the nanofibers by utilizing an atomic layer deposition means; and (4) placing a product in a lithium hydroxide solution, carrying out hydrothermal reaction, and carrying out heat treatment in an argon atmosphere. According to the prepared carbon spiral nanofiber / lithium titanate composite material, the lithium titanate nanosheets are compounded on the surfaces of the carbon spiral nanofibers, a core-shell cross-linked porous structure is formed, high energy, high power density and long cycle life are achieved; and the preparation method is simple, convenient and easy to control.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a carbon nanofiber / lithium titanate composite electrode material and a preparation method and application thereof. Background technique [0002] Clean and green energy materials and electrochemical energy storage technology are the key industries supported by the national "14th Five-Year Plan", among which new high-power fast-charging lithium-ion batteries are key development areas. At present, the fast charging performance of commercial graphite negative electrode lithium storage materials is not ideal, the ion mobility is low, and under high power working conditions, lithium dendrites and volume expansion are easily generated, resulting in electrode performance attenuation, which seriously hinders its fast charging at high power. Industrial applications in lithium-ion batteries. [0003] At the same time, lithium titanate, as a zero-strain lithium storage negativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525C01B32/15C01G23/00B82Y40/00B82Y30/00
CPCH01M4/485H01M4/625H01M10/0525C01B32/15C01G23/005B82Y40/00B82Y30/00C01P2004/80C01P2004/50C01P2004/24C01P2004/62C01P2006/40Y02E60/10
Inventor 夏新辉张永起
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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