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A preparation method of porous oxide-wrapped battery silicon negative electrode material

A technology of porous oxide and silicon anode, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of inability to take into account the large specific capacity of the expansion-controlled silicon anode material, achieve good charge-discharge cycle performance, simple preparation method, inhibit inflated effect

Active Publication Date: 2019-03-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a porous oxide-wrapped battery silicon negative electrode material, which solves the problem of expansion control and the large specific capacity of the silicon negative electrode material in the prior art during the charge and discharge process of the lithium ion battery silicon negative electrode material Incompatible technical issues

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  • A preparation method of porous oxide-wrapped battery silicon negative electrode material
  • A preparation method of porous oxide-wrapped battery silicon negative electrode material
  • A preparation method of porous oxide-wrapped battery silicon negative electrode material

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Embodiment 1

[0027] The preparation method of porous oxide-wrapped battery silicon negative electrode material in this embodiment, the preparation of porous gallium trioxide-wrapped battery silicon negative electrode material in this embodiment, includes the following steps:

[0028] S1. Put the silicon anode material in an oven at 70°C for 8 hours, then put it into a reagent bottle and seal it for later use;

[0029] S2. Put the silicon anode material obtained in step S1 into the gas phase atomic layer deposition chamber, the temperature of the chamber is 120°C, ethanol is used as the pulse precursor, high-purity nitrogen is used as the carrier gas, the pulse time of ethanol is 30s, and then Use high-purity nitrogen to blow off excess ethanol to obtain a silicon negative electrode material with surface passivation treatment;

[0030] S3. Raise the temperature of the gas-phase atomic layer deposition chamber carrying the surface-passivated silicon negative electrode material to 200°C, add ...

Embodiment 2

[0035] The preparation method of porous oxide-wrapped battery silicon negative electrode material in this embodiment, this embodiment prepares niobium pentoxide-wrapped battery silicon negative electrode material, includes the following steps:

[0036] S1. Put the silicon anode material into an oven at 60°C and bake for 6 hours, then put it into a reagent bottle and seal it for later use;

[0037] S2. Put the silicon anode material obtained in step S1 into the gas phase atomic layer deposition chamber, the temperature of the chamber is 130°C, using ethanol as the pulse precursor, using high-purity nitrogen as the carrier gas, and the pulse time of ethanol is 30s, and then Use high-purity nitrogen to blow off excess ethanol to obtain a silicon negative electrode material with surface passivation treatment;

[0038] S3. Raise the temperature of the vapor phase atomic layer deposition chamber carrying the surface passivated silicon negative electrode material to 200°C, add pentae...

Embodiment 3

[0041] The preparation method of the porous oxide-wrapped battery silicon negative electrode material in this example, the preparation of the tantalum pentoxide-wrapped battery silicon negative electrode material in this example, includes the following steps:

[0042]S1. Put the silicon anode material in an oven at 75°C and bake for 10 hours, then put it into a reagent bottle and seal it for later use;

[0043] S2. Put the silicon anode material obtained in step S1 into a gas-phase atomic layer deposition chamber with a chamber temperature of 150° C., using ethanol as a pulse precursor, high-purity nitrogen as a carrier gas, and a pulse time of ethanol for 50 s, and then Use high-purity nitrogen to blow off excess ethanol to obtain a silicon negative electrode material with surface passivation treatment;

[0044] S3. Raise the temperature of the vapor phase atomic layer deposition chamber carrying the surface passivated silicon negative electrode material to 300°C, add tantalu...

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Abstract

The invention provides a preparation method of a porous oxide-coated battery silicon anode material and relates to the technical field of preparation of lithium ion battery anode materials. The preparation method provided by the invention comprises the following steps: performing silicon anode material drying treatment; performing surface passivation treatment on a silicon anode material with ethyl alcohol; performing set cyclic cycle deposition in a gas-phase atomic layer deposition chamber to obtain the porous oxide-coated battery silicon anode material. The preparation method provided by the invention is simple and good in repeatability; the prepared lithium ion battery silicon anode material not only has large specific capacity, but also can inhibit the expansion of the silicon anode material in the charting and the discharging processes of a lithium ion battery, so that the lithium ion battery silicon anode material has good charging and discharging cycle performance.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery negative electrode materials, and relates to a preparation method of porous oxide-wrapped battery silicon negative electrode materials. Background technique [0002] At present, the commonly used anode materials for lithium-ion batteries on the market are mainly graphite materials, such as natural graphite, artificial graphite, hard carbon, mesocarbon microspheres, etc., but the theoretical capacity of carbon anode materials is only 372 mAh / g; and, this The lithium intercalation potential of the material is mainly concentrated in the range of 0~0.1V, which is very close to the deposition potential of metal lithium, which is not conducive to the safety of the battery. The biggest problem with the lithium titanate negative electrode material is that the theoretical capacity is low, and it is easy to produce flatulence, which is not easy In line with the development trend o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/386H01M4/624Y02E60/10
Inventor 王春雷刘兴亮汪伟伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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