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A silicon-carbon nanotube sphere and its preparation method, battery negative electrode and lithium-ion battery

A carbon nanotube and sphere technology, applied in the field of ion batteries, can solve the problems of reducing the gram capacity of silicon-based materials, cracking graphite shells, poor cycle stability, etc. High volume effect

Active Publication Date: 2019-02-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, this composite material obviously reduces the gram capacity of the silicon-based material at first, which is only slightly higher than that of the graphite material, and the silicon particles are embedded in the graphite lattice, which will cause the graphite shell to break during the repeated volume change of the silicon material. Exposed fresh silicon surface, side reactions occur, and capacity decays rapidly
It can be seen that the silicon-based composite material provided by the prior art has low gram capacity, poor cycle stability, and low magnification

Method used

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  • A silicon-carbon nanotube sphere and its preparation method, battery negative electrode and lithium-ion battery
  • A silicon-carbon nanotube sphere and its preparation method, battery negative electrode and lithium-ion battery
  • A silicon-carbon nanotube sphere and its preparation method, battery negative electrode and lithium-ion battery

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preparation example Construction

[0036] The invention provides a method for preparing silicon-carbon nanotube spheres, comprising:

[0037] Granulating the dispersed solution to obtain silicon-carbon nanotube spheres;

[0038] The dispersion solution includes silicon particles and carbon nanotubes.

[0039] In the invention, the dispersion solution is granulated to obtain silicon-carbon nanotube spheres. In the present invention, the dispersion solution includes silicon particles and carbon nanotubes. In the present invention, the particle size of the silicon particles is preferably 1nm-1000nm, more preferably 20nm-800nm, more preferably 50nm-500nm, more preferably 100nm-400nm, most preferably 200nm-300nm. In the present invention, there is no special limitation on the source of the silicon particles, and nanoscale silicon materials well known to those skilled in the art can be used. For example, silicon particles can be prepared by magnesia thermal reduction or carbothermal reduction of silicon dioxide.

...

Embodiment 1

[0080] Add 0.1g of silicon particles with a particle size of 50nm into 30mL of secondary water, and disperse by ultrasonic for 15min to obtain a silicon solution;

[0081] Add the silicon solution into a 50mL polytetraethylene hydrothermal reactor, place it in a drying oven at 130°C for 24 hours of hydrothermal reaction, and obtain a silicon dispersion;

[0082] Take out the silicon dispersion, pour it into a 50mL beaker, weigh 0.05g of carboxylated carbon nanotubes with a diameter of 20nm and a length of 0.5 to 1 micron, add it to the silicon dispersion, and perform ultrasonication for 15min Disperse to obtain a dispersed solution;

[0083] The dispersion solution enters the spray dryer at a rate of 1mL / min, the atomizer of the spray dryer converts the dispersion solution into an atomized state, and the temperature of the drying chamber is 180°C to quickly turn water into water vapor and enter the separator In , the nanoparticles agglomerate and grow into micron-sized partic...

Embodiment 2

[0087] Add 0.5g of silicon particles with a particle size of 50nm into 30mL of secondary water, and disperse by ultrasonic for 15min to obtain a silicon solution;

[0088] Add the silicon solution into a 50mL polytetraethylene hydrothermal reactor, place it in a drying oven at 150°C for 12h of hydrothermal reaction, and obtain a silicon dispersion;

[0089] Take out the silicon dispersion, pour it into a 50mL beaker, weigh 0.1g of carboxylated carbon nanotubes with a diameter of 20nm and a length of 0.5 to 1 micron, add it to the silicon dispersion, and perform ultrasonic dispersion for 15min , to obtain a dispersed solution;

[0090] The dispersion solution enters the spray dryer at a rate of 0.5mL / min, the atomizer of the spray dryer converts the dispersion solution into an atomized state, and the temperature of the drying chamber is 160°C to quickly change water into water vapor, and enter the separator In , the nanoparticles agglomerate and grow into micron-sized particle...

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Abstract

The invention provides a method for preparing silicon-carbon nanotube spheres, comprising: granulating a dispersion solution to obtain silicon-carbon nanotube spheres; the dispersion solution includes silicon particles and carbon nanotubes. The present invention provides a silicon-carbon nanotube sphere prepared by the method described in the above technical solution. The present invention provides a battery negative electrode, comprising the silicon-carbon nanotube sphere described in the above technical solution. The present invention provides a lithium ion battery, the negative pole of the lithium ion battery is the negative pole of the battery described in the above technical solution. The silicon-carbon nanotube sphere prepared by the method provided by the invention, by compounding silicon particles and carbon nanotubes, and synthesizing a secondary agglomerated sphere by granulation technology, the silicon-carbon nanotube sphere prepared by the method provided by the invention Higher gram capacity and better electrochemical stability. In addition, the tap density of the silicon-carbon nanotube sphere prepared by the method provided by the invention is relatively high.

Description

technical field [0001] The invention relates to the technical field of ion batteries, in particular to a silicon-carbon nanotube sphere and a preparation method thereof, a battery negative electrode and a lithium ion battery. Background technique [0002] In recent years, the energy crisis has become increasingly serious, and the demand for new energy has become increasingly urgent. Research and development of new alternative energy sources and energy conservation and emission reduction has important developmental strategic significance. As a green and environmentally friendly new energy source, lithium-ion batteries have attracted more and more attention. A new type of lithium-ion battery with high capacity, long life and high safety has become the goal pursued by people. [0003] The anode material of lithium ion battery is an important part of the battery, and the anode material plays a pivotal role in the development of the battery. In current commercial lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 王宏宇李超齐力
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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