Negative electrode material and preparation method thereof, electrochemical device and electronic device

A technology for negative electrode materials and electronic devices, applied in the direction of electrochemical generators, circuits, electrical components, etc., can solve the problems of increasing the oxygen content of materials, low electrical conductivity, and reducing the first effect of negative electrode materials, so as to improve electronic conductivity and improve Ionic conductivity, the effect of increasing the kinetic rate

Pending Publication Date: 2022-02-25
NINGDE AMPEREX TECH
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Problems solved by technology

But the electrical conductivity of silicon (resistivity>10 8 Ω.cm) is low. In order to improve the conductivity of silicon materials, silicon materials are usually combined with carbon materials to increase their conductivity.
However, when silicon-carbon composites are used, it is easy to increase the oxygen content of the material, and the increase in the oxygen content in the negative electrode material will directly lead to the reduction of the first effect of the negative electrode material.
In addition, the silicon material has a volume expansion of about 300% during charge and discharg

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  • Negative electrode material and preparation method thereof, electrochemical device and electronic device
  • Negative electrode material and preparation method thereof, electrochemical device and electronic device
  • Negative electrode material and preparation method thereof, electrochemical device and electronic device

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[0036] In a second aspect, the present application provides a method for preparing an anode material, the method comprising the following steps:

[0037] Step S10, adding silicon-based material particles into a mixed solution of water and ethanol containing metal oxides, mixing evenly and then drying to obtain a precursor;

[0038] In step S20, the precursor is subjected to heat treatment under the protection of an inert atmosphere or a reducing atmosphere, so that metal elements are doped into the surface of the silicon-based material particles to obtain a negative electrode material.

[0039] In the above scheme, by mixing the metal oxide with the silicon-based material, the metal oxide on the surface of the silicon-based material can be doped with metal elements into the silicon-based material particles under heat treatment; thereby improving the interface properties of the silicon-based material, Reduce its reactivity with the electrolyte, greatly reduce the formation of S...

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Abstract

The invention provides a negative electrode material and a preparation method thereof, an electrochemical device and an electronic device.The negative electrode material comprises a silicon-based material, and metal elements are arranged on the surfaces of silicon-based material particles; the metal element comprises at least one of Ge, Al, Zn, Sn, Sb, Bi, Fe, Mg, Ti, Cr, Mn, Co, Ni, Cu or Pb. The negative electrode material provided by the invention can effectively improve the conductivity of the material, improve the cycle performance of the negative electrode material and reduce the expansion rate of the battery.

Description

technical field [0001] The present application relates to the technical field of negative electrode materials, in particular, to negative electrode materials and preparation methods thereof, electrochemical devices and electronic devices. Background technique [0002] At present, silicon-based anode materials have a gram capacity as high as 1500mAh / g to 4200mAh / g, and are considered to be the most promising next-generation lithium-ion anode materials. But the electrical conductivity of silicon (resistivity>10 8 Ω.cm) is low, in order to improve the electrical conductivity of the silicon material, the silicon material is usually compounded with a carbon material to increase its electrical conductivity. However, when silicon-carbon composite is used, it is easy to increase the oxygen content of the material, and the increase of oxygen content in the negative electrode material will directly lead to the decrease of the first effect of the negative electrode material. In ad...

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Application Information

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IPC IPC(8): H01M4/134H01M4/38H01M10/0525
CPCH01M4/386H01M4/134H01M10/0525Y02E60/10
Inventor 苏俊铭
Owner NINGDE AMPEREX TECH
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