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Lithium titanate composite negative electrode material, preparation method thereof and lithium-ion battery

A negative electrode material and composite material technology, applied in the field of lithium-ion battery negative electrode materials and their preparation, to achieve good cycle stability, improve electrochemical performance and safety effects

Active Publication Date: 2019-11-05
GUANGDONG DONGDAO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no lithium titanate composite anode material containing MXene with relatively excellent performance in the prior art.

Method used

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  • Lithium titanate composite negative electrode material, preparation method thereof and lithium-ion battery
  • Lithium titanate composite negative electrode material, preparation method thereof and lithium-ion battery

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preparation example Construction

[0054] The preparation method of the lithium titanate composite negative electrode material of the present invention comprises the following steps:

[0055] 1. Preparation of transition metal salt solution

[0056] At room temperature (20°C), dissolve one or more of transition group metals iron, cobalt, nickel, and chromium nitrate, chloride, sulfate, acetate, and oxalate in water, according to 150-740W Ultrasonic power, frequency 28KHz, power density not less than 0.5W / cm 2 , ultrasonically stirred for 0.5-2 hours to make it fully dissolved in water to obtain a transition-group metal salt solution with a concentration of transition-group metal ions of 0.1-10 mol / L. The concentration can be 1 mol / L, 2.5 mol / L, 5 mol / L, 8 mol / L, 10mol / L.

[0057] The preparation of the transition group metal salt solution can ensure that the surface of the MXene is evenly loaded with the transition group metal salt in the liquid phase to prepare for the next step.

[0058] 2. Preparation of...

Embodiment 1

[0089] 1. Dissolve cobalt nitrate in water at a power density of not less than 0.5W / cm 2 , and ultrasonically stirred for 1.5 h to obtain a uniform transition metal salt solution with a cobalt ion concentration of 2 mol / L.

[0090] Second, the Ti 3 C 2 Put it in a vacuum reactor, vacuum it to below 0.08MPa, and press Ti 3 C 2 The mass ratio of the transition metal salt solution to the transition metal salt solution is 0.1:1, and the transition metal salt solution is injected into the vacuum reactor, and the power density is not less than 0.5W / cm 2 , ultrasonically stirred for 1h, then released the vacuum, filtered, and dried to obtain Ti with cobalt nitrate 3 C 2 particles.

[0091] 3. Ti with cobalt nitrate 3 C 2 The particles were put into a quartz tube furnace, filled with nitrogen, the flow rate was 1L / min, the temperature was raised to 600°C at a heating rate of 1.5°C / min, filled with acetylene gas, the flow rate was 5.0L / min, and chemical vapor deposition was obt...

Embodiment 2

[0099] 1. Dissolve nickel sulfate in water, and the power density is not less than 0.5W / cm 2 , and ultrasonically stirred for 1.0 h to obtain a uniform transition metal salt solution with a nickel ion concentration of 0.5 mol / L.

[0100] Second, the Ti 2 C is placed in a vacuum reactor, vacuumed to less than 0.08MPa, and then press Ti 2 The mass ratio of C and transition metal salt solution is 0.1:1, inject the transition metal salt solution into the vacuum reactor, and the power density is not less than 0.5W / cm 2 , ultrasonically stirred for 1 h, then released the vacuum, filtered, and dried to obtain Ti with nickel sulfate 2 C particles.

[0101] 3. Ti with nickel nitrate 2 C particles are put into a quartz tube furnace, filled with nitrogen gas, the flow rate is 1L / min, the temperature is raised to 600°C at a heating rate of 1.5°C / min, filled with acetylene gas, the flow rate is 5.0L / min, chemical vapor deposition is 2h, get Ti 2 C and carbon nanotube composites.

[...

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Abstract

The invention discloses a lithium titanate composite negative electrode material, a preparation method thereof and a lithium-ion battery. The technical problem to be solved is to improve the electrochemical performance of the lithium titanate composite negative electrode material. The preparation method of the lithium titanate composite negative electrode material comprises the steps of preparinga transition group metal salt solution, preparing MXene particles loaded with transition metal salt, preparing a MXene and nano carbon composite material, performing acid purification on the MXene andnano carbon composite material, preparing a precursor, and calcining to obtain the lithium titanate composite negative electrode material. In the lithium-ion battery of the present invention, a negative electrode is made of the lithium titanate composite negative electrode material of the invention, compared with the prior art, lithium titanate nanoparticles are jointed with a flexible frame woven by MXene and nano carbon, the composite material with three-dimensional self-supporting properties of lithium titanate, the MXene and the nano carbon is obtained, the composite material has the advantages of good conductive performance and good cycle stability, and the electrochemical performance and safety of the lithium-ion battery are effectively improved.

Description

technical field [0001] The invention relates to a lithium ion battery material and its preparation method and application, in particular to a lithium ion battery negative electrode material and its preparation method and application. Background technique [0002] With the development of technology, social progress and increasingly severe environmental problems, the use of green and renewable energy in various industries is becoming more and more extensive, and the market for pure electric vehicles and hybrid electric vehicles is also growing at a high speed. As one of the most important components in the field of energy storage, lithium-ion batteries, while meeting performance indicators such as high energy density, long cycle life, safety and stability, how to significantly improve their high-current charge-discharge performance and rate performance have become increasingly academic It is a research topic of great concern to the world and industry. [0003] Graphite anode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/485H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 吴其修
Owner GUANGDONG DONGDAO NEW ENERGY
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