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Composite lithium battery cathode with high energy storage efficiency, preparation method thereof and lithium battery

A composite, high energy storage technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., to increase battery capacity, ensure uniformity, and improve swelling effects

Active Publication Date: 2018-10-23
湖南庆胜新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a high energy storage efficiency composite lithium battery positive electrode and its preparation method to solve the problem of effectively improving the migration rate of electrons and lithium ions at the electrode interface, improving the average discharge capacity and cycle efficiency, The problem of improving the energy density of the battery and increasing the conductivity of the battery

Method used

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  • Composite lithium battery cathode with high energy storage efficiency, preparation method thereof and lithium battery

Examples

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Embodiment 1

[0024] Example 1 Preparation of High Energy Storage Efficiency Composite Lithium Battery Positive Electrode I

[0025] Step 1. Preparation of modified carbon nanotube / carbon nanofiber composite membrane: dissolving polyacrylonitrile in dimethyl sulfoxide to form a polyacrylonitrile solution with a mass fraction of 8% wt., and then making the mass ratio 0.5: 3. The modified carbon nanotubes and polyacrylonitrile solution are mixed, ultrasonically dispersed at room temperature to form a spinning solution, and then the ambient temperature is 15-30°C, and the ambient humidity is 5%-70%. Using a high-voltage electrostatic spray device, electrostatic The generator voltage is 10kV-20kV, the distance between the metal needle and the take-up is 12cm, the flow rate is 0.5mL / h, and the spinning speed is 500rpm / min, the spinning solution is prepared into a nanofiber film, and then the nanofiber Transfer the fiber membrane to a tube furnace, raise the temperature to 150°C at a heating rate...

Embodiment 2

[0029] Example 2 Preparation of High Energy Storage Efficiency Composite Lithium Battery Positive Electrode II

[0030] Step 1. Preparation of modified carbon nanotube / carbon nanofiber composite membrane: dissolving polyacrylonitrile in dimethyl sulfoxide to form a polyacrylonitrile solution with a mass fraction of 12% wt., and then making the mass ratio 2: 10 modified carbon nanotubes and polyacrylonitrile solution are mixed, ultrasonically dispersed at room temperature to form a spinning solution, and then at an ambient temperature of 15-30°C and an ambient humidity of 5%-70%, use a high-voltage electrostatic spray device to electrostatically The generator voltage is 10kV-20kV, the distance between the metal needle and the yarn collector is 15cm, the flow rate is 3mL / h, and the spinning speed is 3000rpm / min, the spinning solution is prepared into a nanofiber film, and then the nanofiber Transfer the film to a tube furnace, raise the temperature to 200°C at a heating rate of ...

Embodiment 3

[0034] Example 3 Preparation of High Energy Storage Efficiency Composite Lithium Battery Cathode III

[0035] Step 1. Preparation of modified carbon nanotube / carbon nanofiber composite membrane: dissolving polyacrylonitrile in dimethyl sulfoxide to form a polyacrylonitrile solution with a mass fraction of 10% wt., and then adjusting the mass ratio to 0.15: 8 modified carbon nanotubes and polyacrylonitrile solution are mixed, ultrasonically dispersed at room temperature to form a spinning solution, and then at an ambient temperature of 15-30°C and an ambient humidity of 5%-70%, use a high-voltage electrostatic spray device to electrostatically The generator voltage is 10kV-20kV, the distance between the metal needle and the yarn collector is 14cm, the flow rate is 2mL / h, and the spinning speed is 1500rpm / min, the spinning solution is prepared into a nanofiber film, and then the nanofiber Transfer the film to a tube furnace, raise the temperature to 180°C at a heating rate of 1....

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Abstract

The invention discloses a composite lithium battery cathode with high energy storage efficiency, a preparation method thereof and a lithium battery. The lithium battery cathode comprises a a current collector and an active cathode slurry applied to the surface of the cathode current collector; the active cathode slurry is prepared from modified silicate composite material, a conductive agent and abinder; and the cathode current collector is a modified carbon nanotube / carbon nanofiber composite film. Compared with the prior art, the cathode current collector disclosed by the invention not onlyimproves the energy density of batteries, but also resists the corrosion of electrolyte and improves adhesion; because a silicate precursor which is prepared by in-situ carbonization composition andball-milling / spray-drying is adopted as the modified silicate composite material, the sintering and agglomeration between silicate particles can be prevented, and the transmission path of lithium ionscan be shortened; because the external surface of the silicate active material is wrapped by a fast ion conductor layer to form a mosaic structure, the material is prevented from being in direct contact with the electrolyte, the lithium ion diffusion capability is improved, and the interface resistance between the material and the electrolyte is decreased.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a positive electrode of a composite lithium battery with high energy storage efficiency, a preparation method thereof, and a lithium battery. Background technique [0002] Since the concept of rechargeable lithium batteries was proposed in the early 1970s, and since lithium-ion batteries were born and commercialized, due to their superior performance, they have rapidly become a multidisciplinary research field in advanced energy, materials, and electrochemistry. Hot spots, and are widely used in notebook computers, mobile phones, digital cameras, mp3 players and other small electronic equipment and medical equipment as driving power. [0003] The cathode material in lithium-ion batteries is the key factor affecting the performance of the battery. The ideal cathode material for lithium-ion batteries should have high capacity, high rate, and high cycle performance. It sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/66H01M10/0525
CPCH01M4/366H01M4/485H01M4/5825H01M4/663H01M10/0525Y02E60/10
Inventor 苟荀
Owner 湖南庆胜新能源科技有限公司
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