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A lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode and its preparation method and application

A carbon nanotube, secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effects of improved electrical conductivity, improved flexibility, and good mechanical properties

Inactive Publication Date: 2015-10-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 4 Ti 5 o 12 The theoretical specific capacity is only 175mAh / g, far lower than carbon-based, silicon-based or tin-based negative electrode materials

Method used

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  • A lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode and its preparation method and application
  • A lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode and its preparation method and application
  • A lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0031] Lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode, that is, pyrrole polymer-coated flexible carbon nanotube electrode modified with pyrene derivative carrying lithium niobate, and its preparation method includes the following steps:

[0032] 1. Add the pyrene derivative to the reactor, use ethanol as the solvent, prepare a 0.5mol / L pyrene derivative ethanol solution, and let it stand after ultrasound; add carbon nanotubes, the mass of the pyrene derivative and the carbon nanotubes The ratio is 1:5, and the reaction is conducted with strong ultrasonic stirring for 12 hours to obtain carbon nanotubes modified by pyrene derivatives;

[0033] 2. Under the condition of maintaining strong ultrasonic stirring, slowly add a mixed solution of niobium oxalate and lithium acetate with a molar ratio of 1:1 into the reactor containing carbon nanotubes modified with pyrene derivatives. The quality of carbon nanotubes and lithium acetate Th...

Embodiment 2

[0043] Lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode, that is, pyrrole polymer-coated flexible carbon nanotube electrode modified with pyrene derivative carrying lithium niobate, and its preparation method includes the following steps:

[0044] 1. Add the pyrene derivative to the reactor, use water as the solvent to prepare a 0.02mol / L pyrene derivative ethanol solution, and let it stand after ultrasound; add carbon nanotubes, the mass of the pyrene derivative and the carbon nanotubes The ratio is 1:0.5, and the reaction is performed with strong ultrasonic stirring for 48 hours to obtain carbon nanotubes modified by pyrene derivatives;

[0045] 2. Under the condition of maintaining strong ultrasonic stirring, slowly add a mixed solution of niobium oxalate and lithium acetate with a molar ratio of 1:1 into the reactor containing carbon nanotubes modified with pyrene derivatives. The quality of carbon nanotubes and lithium acetate ...

Embodiment 3

[0050] Lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode, that is, pyrrole polymer-coated pyrene-modified carbon nanotube flexible electrode loaded with lithium niobate, and its preparation method includes the following steps:

[0051] 1. Add pyrene to the reactor, use ethanol as the solvent, configure a 1mol / L pyrene ethanol solution, and let it stand after ultrasound; add carbon nanotubes, the mass ratio of pyrene to carbon nanotubes is 1:10, strong Ultrasonic stirring reaction for 6 hours to obtain pyrene-modified carbon nanotubes;

[0052] 2. While maintaining strong ultrasonic stirring, slowly add a mixed solution of niobium oxalate and lithium acetate with a molar ratio of 1:1 into the reactor containing pyrene-modified carbon nanotubes. The mass ratio of carbon nanotubes to lithium acetate is After reacting in a water bath at 10:1 at 50°C for 24 hours, put it in a tube furnace filled with nitrogen atmosphere and heat treatmen...

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Abstract

The invention provides a flexible lithium-ion secondary battery cathode by compounding lithium niobate with a carbon nanotube. An electrode is a carbon nanotube flexible electrode coated with a polymer and modified by pyrene or a pyrene derivative loading lithium niobate; the invention further provides a preparation method and application of the flexible lithium-ion secondary battery cathode. The preparation technology of the cathode is simple, the cost is low, a liquid-phase in-situ growth method is adopted by the electrode to load lithium niobate materials on a carbon nanotube network with high conductivity, and the carbon nanotube network is coated with a conductive polymer; a flexible electrode membrane with a certain mechanical strength is obtained by utilizing the characteristic that a compound system of the carbon nanotube and the conductive polymer has better flexibility, so that the flexibility of the electrode can be achieved well and the electrochemical performance of the lithium niobate materials is improved, the electrode has charge-discharge capacity higher than lithium niobate cathode obviously, excellent cycle performance and coulombic efficiency close to 100%, the mechanical performance is good, the electrochemical performance is excellent, and safety and reliability are achieved.

Description

Technical field [0001] The invention belongs to the field of battery material science, and particularly relates to a lithium niobate composite carbon nanotube flexible lithium ion secondary battery negative electrode, a preparation method of the electrode, and a lithium ion secondary battery including the electrode. Background technique [0002] Carbonate electrolyte is currently the most commonly used electrolyte in lithium ion secondary battery systems. This type of electrolyte has a discharge voltage lower than 1.0V (vs Li + / Li 0 ) Will decompose and form SEI film, which will affect the safety and cycle stability of the battery. The current commercial carbon-based anode materials, as well as the silicon-based and tin-based anode materials that are being developed, have the above-mentioned problems in use due to their low redox potential. [0003] Li 4 Ti 5 O 12 As an emerging anode material, its redox potential is 1.5V (vs Li + / Li 0 ) Around, can effectively avoid the above pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 范奇孙岳明雷立旭王育乔齐齐
Owner SOUTHEAST UNIV