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A kind of negative electrode active material for battery and preparation method thereof

A negative electrode active material and a technology of negative electrode active materials, applied in the field of negative electrode active materials and their preparation, can solve the problems of insufficient density and insufficient stability of the aqueous homogenate system, so as to avoid the loss of active components and improve Coulombic efficiency and capacity stability , reduce the effect of side effects

Active Publication Date: 2021-10-08
BERZELIUS (NANJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the structure of the amorphous composite layer is relatively loose and not dense enough, the aqueous homogenate system based on this material structure is still not stable enough.

Method used

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  • A kind of negative electrode active material for battery and preparation method thereof
  • A kind of negative electrode active material for battery and preparation method thereof
  • A kind of negative electrode active material for battery and preparation method thereof

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preparation example Construction

[0058] The present invention also proposes a preparation method comprising the negative electrode active material as described in any one of the foregoing, the method comprising:

[0059] Taking silicon oxide compound particles, doping lithium elements and non-lithium metal elements into the silicon oxide compound particles; wherein, the stoichiometric ratio of silicon and oxygen elements in the silicon oxide compound particles is 1:0.4-1:2, preferably 1 :0.6-1:1.5, more preferably 1:0.8-1:1.2.

[0060] Further, the median diameter of the silicon oxide compound particles is between 0.2-20 μm, preferably 1-15 μm, more preferably 2-10 μm. The doping temperature of non-lithium metal elements may be 400-1100°C, preferably 600-1000°C. The doping temperature of lithium element may be 400-900°C, preferably 550-850°C.

[0061] Further, the silicon oxide compound particles may be completely coated, partially coated or not coated with carbon film layer. The silicon oxide compound may...

Embodiment 1

[0074] After dispersing 1000g of silicon-oxygen compound particles with a median particle size of 4 μm (the atomic ratio of silicon to oxygen is 1:1), 213.3g of tetrabutyl titanate and 25 grams of polyvinylpyrrolidone (PVP) in 3000g of deionized water, the The slurry was spray dried. Subsequently, the obtained powder was heated at 850°C for 3 hours in a nitrogen atmosphere, and then subjected to airflow crushing. According to the results of scanning electron microscopy and X-ray energy spectrum analysis (EDS), it was proved that a carbon film layer doped with titanium was obtained. silicon oxide powder. There is a small amount of titanium-containing compound residues on the surface of the particles, forming a point-like coating structure, while most of the titanium is doped into the interior of the silicon oxide compound particles (such as figure 1 ). At the same time, the results of X-ray energy spectrum analysis show that the distribution of titanium element on the silicon...

Embodiment 2

[0083] Compared with Example 1, in Example 2, silicon-oxygen compound particles are coated with a carbon film layer by chemical vapor deposition, and acetylene is used as a carbon source, and the coating reaction is carried out at 900 ° C for 3 hours, and a complete carbon film is obtained. layer of silicon oxide particles. Subsequently, 11.4g of nano-alumina was uniformly coated on the surface of 1000g of the above particles by dry coating, and kept at 800°C for 3 hours under a nitrogen atmosphere to obtain a complete carbon film doped with aluminum of silicon oxide compounds. The results of the scanning electron microscope showed that there was no aluminum-containing compound residue on the surface of the particles, indicating that the aluminum had been completely doped into the silicon-oxygen compound ( image 3 ). Next, the silicon-oxygen compound was doped with lithium metal by the same process as in Example 1 to obtain a lithium-containing silicon-oxygen compound doped...

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Abstract

The invention relates to a negative electrode active material for batteries, which has negative electrode active material particles, and the negative electrode active material particles contain silicon oxide compounds, and is characterized in that the negative electrode active material particles include lithium elements and non-lithium doped metals , wherein, the non-lithium doped metal includes one or more of titanium, magnesium, zirconium, zinc, aluminum, yttrium, calcium, and the content of the non-lithium doped metal in the negative electrode active material is 0.01- 20wt%, preferably 0.05-15wt%, more preferably 0.1-10wt%, more preferably 0.1-5wt%. The secondary battery prepared by using the negative electrode active material of the invention has the advantages of high capacity, high coulombic efficiency, long cycle life and strong water resistance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a negative electrode active material for batteries and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of various portable electronic devices and electric vehicles, the demand for batteries with high energy density and long cycle life has become increasingly urgent. At present, the negative electrode material of commercialized lithium-ion batteries is mainly graphite, but due to the low theoretical capacity (372mAh / g), the further improvement of battery energy density is limited. The single silicon anode material has a high capacity advantage (lithium intercalation state at room temperature is Li 15 Si 4 , the theoretical lithium storage capacity is about 3600mAh / g), which is about 10 times the theoretical capacity of the current commercial graphite anode material, and has the advantage of high capacity that cannot be matched...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 罗姝李喆查道松汪芳王岑张和宝
Owner BERZELIUS (NANJING) CO LTD
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