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Anode materials, electrochemical devices and electronic devices

A negative electrode material, electrochemical technology, applied in the field of electrochemistry, can solve problems such as unsatisfactory, and achieve the effect of improving cycle performance

Active Publication Date: 2022-07-15
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current technology for improving electrochemical devices can improve the cycle performance of electrochemical devices to a certain extent, it is not satisfactory, and further improvements are expected

Method used

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  • Anode materials, electrochemical devices and electronic devices
  • Anode materials, electrochemical devices and electronic devices
  • Anode materials, electrochemical devices and electronic devices

Examples

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preparation example Construction

[0044] In some embodiments of the present application, a method for preparing an electrochemical device is also proposed, comprising the following steps:

[0045] Preparation of negative electrode material:

[0046] Step 1: 500g of amorphous silicon oxide powder with a particle size of 1mm to 100mm and a chemical formula of SiOx (0.5≤x≤1.6) is first subjected to mechanical crushing treatment, and then air crushed with a jet mill, and then classified to obtain the particle size Silica powder in the range of 0.2 μm to 30 μm.

[0047] Step 2: Place the silicon oxide powder obtained in Step 1 in a CVD (Chemical Vapor Deposition, Chemical VaporDeposition) furnace, heat up to 900°C to 1000°C, fill with a carbon source gas, and the gas flow rate is 300mL / min. After 60min Cut off the carbon source gas immediately. It was warmed to room temperature under an inert atmosphere, and the powder samples were taken out after cooling. Inert atmosphere is Ar, N 2 , one or more mixtures of H...

Embodiment 1

[0060] Preparation of negative electrode material:

[0061] Step (1): The particle size of 500g is 1mm to 100mm, and the chemical formula is SiO x The amorphous silicon oxide powder (0.5≤x≤1.6) is first subjected to mechanical crushing, and then air crushed with a jet mill to obtain silicon oxide powder with a particle size range of 0.2μm to 30μm. SiO x .

[0062] Step (2): the SiO obtained in step (1) x It was placed in a CVD furnace, heated to 960°C, filled with methane, the gas flow was 300mL / min, and the methane gas was cut off immediately after maintaining for 120min. The temperature was lowered to room temperature in an inert Ar atmosphere, and the carbon-coated silicon-oxygen material was taken out after cooling.

[0063] Step (3): perform demagnetization treatment, classification treatment, and 1300-mesh sieve on the carbon-coated silicon-oxygen material obtained in step (2) to obtain a carbon-coated silicon oxide negative electrode material.

[0064] Preparation ...

Embodiment 2

[0073] The only difference between Example 2 and Example 1 is that in step (3) of preparing the negative electrode material, a 1200-mesh screen is used for sieving, which is the same as Example 1.

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Abstract

The present application provides anode materials, electrochemical devices, and electronic devices. The negative electrode materials provided in the embodiments of the present application include: silicon-based materials, or silicon-based materials and graphite; the silicon-based materials include: silicon-oxygen materials and a carbon layer on the surface of the silicon-oxygen materials; the particle size distribution of the silicon-based materials satisfies 1 ≤(Dn99‑Dn10) / Dn50≤4, and Dn10≥1μm, Dn50≥3μm. The negative electrode materials provided in the embodiments of the present application control the number and particle size distribution of the silicon-based materials, so that the size particles are better matched, thereby improving the cycle performance of the electrochemical device.

Description

technical field [0001] The present application relates to the technical field of electrochemistry, and in particular, to a negative electrode material, an electrochemical device, and an electronic device. Background technique [0002] With the development and advancement of electrochemical devices (eg, lithium-ion batteries), higher and higher requirements have been placed on their cycle performance. Although the current technology for improving electrochemical devices can improve the cycle performance of electrochemical devices to a certain extent, it is not satisfactory, and further improvements are expected. SUMMARY OF THE INVENTION [0003] The embodiments of the present application provide a negative electrode material, including: a silicon-based material, or a silicon-based material and graphite; the silicon-based material includes: a silicon-oxygen material and a carbon layer on the surface of the silicon-oxygen material; the particle size of the silicon-based mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCH01M4/628H01M4/625H01M4/483H01M10/0525H01M2004/027H01M2004/021Y02E60/10H01M4/366H01M4/587H01M4/623H01M10/0569H01M2300/0028H01M4/386H01M4/583H01M2300/0051
Inventor 易婷
Owner NINGDE AMPEREX TECH