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A lithium-silicon battery electrode material, a preparation method thereof and a lithium-silicon battery

A technology for electrode materials and silicon batteries, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as unsatisfactory specific capacity of batteries, achieve improved cycle stability, high-quality ratio Capacity and the effect of prolonging the cycle life

Active Publication Date: 2019-01-22
河南克莱威纳米碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when silicon is used as a battery electrode material, the specific capacity of the battery is not ideal.

Method used

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  • A lithium-silicon battery electrode material, a preparation method thereof and a lithium-silicon battery
  • A lithium-silicon battery electrode material, a preparation method thereof and a lithium-silicon battery
  • A lithium-silicon battery electrode material, a preparation method thereof and a lithium-silicon battery

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preparation example Construction

[0030] The present invention also provides a preparation method of the lithium-silicon battery electrode material described in the above technical solution, comprising the following steps:

[0031] (1) shearing and dispersing a mixture comprising silicon, carbon nanotubes, a binder and water to obtain an active slurry;

[0032] (2) Forming the active slurry in the step (1) at a high temperature on the surface of the substrate to obtain a silicon-carbon nanotube composite film; the temperature of the high-temperature film formation is 150-200° C.;

[0033] (3) performing a pre-lithiation treatment on the silicon-carbon nanotube composite film of the step (2), to obtain a lithiation modified film;

[0034] (4) Perform fluorination modification on the lithiated modified thin film in the step (3) to obtain a lithium-silicon battery electrode material.

[0035] In the invention, the mixture including silicon, carbon nanotube, binder and water is sheared and dispersed to obtain act...

Embodiment 1

[0066] Mix silicon, carbon nanotubes, nanocellulose and deionized water according to Table 1, disperse at high-speed shear at 10,000r / min for 40 minutes, spray on a high-temperature aluminum plate at 150°C for high-temperature film formation, and obtain silicon-carbon nano Tube lamination film, cut The film sheet is spare.

[0067] Use the thin film obtained above as the negative electrode, use the lithium sheet as the counter electrode in the glove box, add the electrolyte dropwise, assemble it into a button-type half-cell without a diaphragm, and place it for 40 minutes to complete the pre-lithiation; then disassemble it in the glove box For the half-cell, take out the lithiated modified film, soak it in dimethyl carbonate (DMC) solution, then take out the film and wash it with ethanol, and then place it in ethanol for immersion for later use.

[0068] Prepare two tube furnaces, respectively numbered No. 1 tube furnace and No. 2 tube furnace. Connect the two tube furnaces ...

Embodiment 2～3

[0071] The lithium-silicon battery electrode material was prepared according to the method of Example 1, except that the amount of raw materials and the step parameters were different, as shown in Tables 1 and 2 for details.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium silicon battery electrode material, a preparation method thereof and a lithium silicon battery. The lithium-silicon battery electrode material provided by the invention comprises silicon. Carbon nanotube composite film, lithium silicon alloy and lithium fluoride, the lithium silicon alloy doped with the interior of the carbon nanotube composite film, wherein the lithium fluoride is doped with the Surface of the silicon-carbon nanotube composite film; The Si-Silicon-Carbon nanotube composite film have porous structure. The lithium-silicon battery prepared by using the electrode material provided by the invention has high mass specific capacity.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-silicon battery electrode material, a preparation method thereof, and a lithium-silicon battery. Background technique [0002] In recent years, with the booming development of portable electronic devices and electric vehicles, the performance requirements of energy storage devices are getting higher and higher. Lithium-ion batteries are a commonly used energy storage device, and the electrode materials in this device have a great influence on the energy storage performance of the battery. [0003] At present, silicon materials have the highest theoretical specific capacity (4200mAh / g), and at the same time have a lower discharge platform of 0.4V (vs.Li / Li + , delithiation voltage), and is safe and non-toxic, and is abundant in nature, so it is regarded as an ideal electrode material. However, when silicon is used as a battery electrode material, the specific capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/382H01M4/386H01M4/628H01M10/0525Y02E60/10
Inventor 孙晓刚吴少军郑典模蔡满园聂艳艳陈珑潘鹤政
Owner 河南克莱威纳米碳材料有限公司
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