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

A technology of negative electrode active material and negative electrode active material, which is applied in the field of negative electrode active material and its preparation, can solve the problems of poor slurry coating quality, easy denaturation, low water resistance, etc., and achieves low cost, small cyclic expansion, and water resistance. good effect

Active Publication Date: 2021-09-28
BERZELIUS (NANJING) CO LTD +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of lithium-containing compounds, this type of material often exhibits strong alkalinity, resulting in low water resistance of the material
Therefore, in the water-based homogenization process of actual battery production, if negative electrode materials containing such silicon-oxylithium compounds are used, the slurry is prone to denaturation due to the high alkalinity of the material; at the same time, due to the water resistance of silicon-oxylithium compounds Poor resistance, easy to react with water, resulting in poor quality and low yield of slurry coating

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

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preparation example Construction

[0069] 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:

[0070] Taking silicon oxide compound particles, doping lithium element and metal M1 and metal M2 elements into the silicon oxide compound particles; wherein, the stoichiometric ratio of silicon and oxygen 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;

[0071] The metal M1 includes one or more of titanium, magnesium, zirconium, zinc, aluminum, yttrium, and calcium;

[0072] The metal M2 includes one or more of copper, nickel, iron, manganese, cobalt, and chromium.

[0073] The doping temperatures of metal M1 and metal M2 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.

[0074] Further, the median diameter of the silicon oxide compound particles is between ...

Embodiment 1

[0088] Mix 1000g of silicon-oxygen compound particles with a median particle size of 5μm (atomic ratio of silicon to oxygen is 1:1), 10g of nano-zirconia and 70g of low-temperature coal tar pitch powder in the coating kettle, and then add 2000g of Dimethylformamide, disperse the mixed powder evenly in dimethylformamide. Then heat the coating kettle to 140° C. and keep stirring at a constant temperature for 3 hours, and finally reheat to 160° C. and keep the temperature constant until the dimethylformamide is evaporated to dryness to obtain a silicon oxide compound material coated with coal tar pitch. The above materials were heated to 900°C under nitrogen atmosphere and kept for 4 hours to carbonize the coal tar pitch. Pass the material obtained after cooling through a 500-mesh sieve, and according to the results of scanning electron microscopy and X-ray energy spectrum analysis (EDS), it is proved that a silicon oxide compound powder coated with a complete carbon film and uni...

Embodiment 2

[0099] Compared with Example 1, the silicon-oxygen compound in Example 2 is not coated with a carbon film layer, and 20g of nano-zinc oxide and 25.5g of nano-nickel oxide are evenly coated on the surface of 1000g of silicon-oxygen compound particles by dry coating. And under a nitrogen atmosphere, heat preservation at 950° C. for 3 hours to obtain a silicon oxide compound doped with zinc and nickel elements. Next, the above-mentioned silicon-oxygen compound is doped with lithium metal in an electrochemical pre-lithium manner to obtain a lithium-containing silicon-oxygen compound doped with zinc and nickel elements.

[0100] The resulting silicon negative electrode active material has a zinc silicate phase and a nickel-silicon alloy phase respectively. The pH of the material is 10.2, and the crystallite size corresponding to the silicon (111) crystal plane is 2.7nm. The aqueous homogenate containing the material Under the accelerated test at 65°C, the material can persist for m...

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Abstract

The invention relates to a negative electrode active material for a battery, which has negative electrode active material particles, the negative electrode active material particles contain a silicon oxide compound, the negative electrode active material particles include lithium element and doped metal M1 and metal M2, Wherein, the metal M1 includes one or more of titanium, magnesium, zirconium, zinc, aluminum, yttrium, and calcium, and the metal M2 includes one or more of copper, nickel, iron, manganese, cobalt, and chromium. One, the content of the metal M1 and metal M2 in the negative electrode active material is 0.01-25wt%, preferably 0.05-15wt%, more preferably 0.1-10wt%, more preferably 0.1-5wt%. The battery prepared by using the negative 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 the commercialized battery is mainly graphite, but due to the low theoretical capacity (372mAh / g), the further improvement of the energy density of the battery 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 matche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/382H01M4/483H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 罗姝李喆查道松汪芳王岑张和宝
Owner BERZELIUS (NANJING) CO LTD
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