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Method for improving lithium battery negative electrode rate performance through magnetic effect

A negative electrode, rate performance technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the diffusion path of lithium ions, difficulty in lithium ion intercalation, and large internal resistance, and improve the ability of deintercalation and migration. Performance regulation, the effect of improving electrical performance

Inactive Publication Date: 2018-08-17
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the internal resistance of the traditional lithium battery negative electrode material is too large due to the anisotropic growth of the negative electrode during the lithium ion deintercalation process, and the lithium ion intercalation is difficult, the present invention proposes a method to improve the rate performance of the negative electrode electrode of the lithium battery through the magnetic effect The method makes the negative electrode material and the electrode current collector vertically combined, the active site of the material is exposed more fully, and the diffusion path of lithium ions is reduced, thereby improving the carrier mobility inside the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Mix carbon nanotubes with an aspect ratio of 120:1, polyvinyl alcohol, sodium dodecylbenzenesulfonate and ethanol, and stir at a high speed of 1500rpm for 5 minutes to obtain a uniformly dispersed suspension. The mass ratio of nanotubes, polyvinyl alcohol, sodium dodecylbenzenesulfonate and ethanol is 1:2:0.8:30;

[0030] (2) Add spinel ferrite NiZnO Fe to the suspension 2 o 3 , the volume content of ferrite is 0.8% of the carbon nanotubes, placed above the neodymium magnet for ultrasonic stirring treatment, to obtain the ferrite dispersion;

[0031] (3) will contain magnetic particles Fe with a particle size of 10nm 3 o4 , Fe 2 o 3 , Ni and Co ferrofluids were added to the ferrite dispersion, the volume ratio of the ferrofluid to the ferrite dispersion was 1:55, and the ultrasound was continued for 2 hours until the supernatant of the dispersion became transparent. The magnetic fluid is completely adsorbed on the carbon nanotubes, and the bottom suspension is ...

Embodiment 2

[0035] (1) Mix silicon nanowires, polyacrylic acid, polystyrene and ethanol with an aspect ratio of 50:1, and stir at a high speed of 600rpm for 5 minutes to obtain a uniformly dispersed suspension. Silicon nanowires, polyacrylic acid, The mass ratio of polystyrene and ethanol is 1:2:0.8:30;

[0036] (2) Add magnetoplumbite-type ferrite Ba to the suspension 3 Ni 2 Fe 24 o 41 , the volume content of ferrite is 0.5% of the carbon nanotube, placed above the neodymium magnet for ultrasonic stirring treatment, to obtain the ferrite dispersion;

[0037] (3) will contain magnetic particles Fe with a particle size of 5nm 3 o 4 , Fe 2 o 3 The ferrofluid is added to the ferrite dispersion, the volume ratio of the ferrofluid to the ferrite dispersion is 1:55, and the ultrasound is continued for 2 hours until the supernatant of the dispersion becomes transparent and the ferrofluid is completely adsorbed On the carbon nanotubes, the bottom suspension is washed and filtered with eth...

Embodiment 3

[0041] (1) Mix a mixture of silicon nanowires and carbon nanotubes with an aspect ratio of 200:1, polyvinyl alcohol, sodium cholate and ethanol, and stir at a high speed of 900 rpm for 5 minutes to obtain a uniformly dispersed suspension. The mass ratio of the mixture of silicon nanowires and carbon nanotubes, polyvinyl alcohol, sodium cholate and ethanol is 1:2:0.8:30;

[0042] (2) Add magnetoplumbite-type ferrite Ba to the suspension 3 co 2 Fe 24 o 41 , the volume content of ferrite is 0.6% of the carbon nanotubes, placed above the neodymium magnet for ultrasonic stirring treatment, to obtain the ferrite dispersion;

[0043] (3) Add the ferrofluid containing magnetic particles Ni and Co with a particle size of 8nm to the ferrite dispersion, the volume ratio of the ferrofluid to the ferrite dispersion is 1:55, and continue ultrasonication for 2 hours, until the supernatant liquid of the dispersion becomes transparent, the magnetic fluid is completely adsorbed on the carbo...

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Abstract

The invention provides a method for improving lithium battery negative electrode rate performance through a magnetic effect. A one-dimensional negative electrode material is adopted for loading ferrofluid and ferrite materials to form an oriented structure under a magnetic field, and by vertical combination with a copper current collector, a negative electrode in a three-dimensional dense array structure is formed. The problem of lithium ion intercalation difficulty caused by excessively high internal resistance resulted from anisotropic growth of the negative electrode of a traditional lithium battery negative electrode material in a lithium ion de-intercalation process is solved; by combination of the ferrite materials, the ferrofluid and the negative electrode through van der Waals force, the negative electrode material is vertically combined on the surface of the copper current collector in an oriented manner under the action of the magnetic field to form the three-dimensional dense array, active points of the material can be exposed more completely, a lithium ion transmission passage is formed, de-intercalation and migration performances of lithium ions in the negative electrode material are effectively improved, the battery rate performance is improved, and improving electrical performances of the negative electrode material through control of the negative electrode structure instead of components is realized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for improving the rate performance of a negative electrode of a lithium battery through a magneto-induced effect. Background technique [0002] With the process of economic globalization and the increasing demand for energy, finding new energy storage devices has become a hot spot in the field of new energy. Compared with nickel-cadmium and nickel-metal hydride batteries, lithium-ion batteries have many advantages such as high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, no memory effect, fast charge and discharge, and wide operating temperature range. It is widely used in various fields. [0003] One of the key materials of lithium-ion batteries is the anode material, and the composition and structure of the anode material have a decisive influence on the electrochemical performance of lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/625Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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