Supercharge Your Innovation With Domain-Expert AI Agents!

Negative electrode active material, preparation method thereof, electrode, battery

A technology of negative electrode active material and negative electrode active material, applied in active material electrodes, negative electrodes, batteries, etc., can solve the problems of low ionic and electronic conductivity, low Coulomb efficiency, etc., and achieve high energy density, high energy density, and expansion. small effect

Active Publication Date: 2022-04-01
BERZELIUS (NANJING) CO LTD +1
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a thicker SEI film will still be formed, lithium silicate and lithium oxide and other substances that cannot be reversibly delithiated will be generated inside the particles, low ion and electronic conductivity, and low Coulombic efficiency during battery cycling.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Negative electrode active material, preparation method thereof, electrode, battery
  • Negative electrode active material, preparation method thereof, electrode, battery
  • Negative electrode active material, preparation method thereof, electrode, battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0066] [Preparation method of negative electrode active material]

[0067] figure 1 It is a flow chart of the preparation of the negative electrode active material of an exemplary embodiment of the present invention.

[0068] S101: Prepare silicon oxide particles.

[0069] The concrete process of preparation can adopt following steps to carry out:

[0070] First, in an inert gas atmosphere or under reduced pressure, the mixture of metal silicon powder and silicon dioxide powder is heated in the temperature range of 900 ° C to 1600 ° C to generate silicon oxide gas, and the mixture of metal silicon powder and silicon dioxide powder The molar ratio is set in the range of 0.5-1.5. The gas generated by the heating reaction of the raw materials will be deposited on the adsorption plate. When the temperature in the reaction furnace is lowered to below 100°C, the sediment is taken out, crushed and pulverized using equipment such as a ball mill, jet mill, etc., to obtain silicon o...

Embodiment 1-1

[0105] Weigh 1000 grams of silicon oxide particles with a median particle size of 6 μm (atomic ratio of silicon to oxygen is 1:1), and place them in a CVD furnace. Using acetylene as a carbon source, the coating reaction was carried out at 950 ° C to obtain silicon oxide particles coated with a relatively complete carbon film layer, in which the coverage rate of the carbon film layer reached 95%, and the thickness of the carbon film layer was 20nm.

[0106] Next, configure a hydrofluoric acid solution with a concentration of 2mol / L, add the above-mentioned silicon-oxygen particles coated with a carbon film layer, and continue to react for 24 hours at a stirring speed of 300r / min to obtain silicon-oxygen particles with a porous shell. Among them, the porous shell layer is mainly macropores with a pore diameter larger than 400nm, and the carbon film layer remains intact (as shown in Figure 3(a) and Figure 3(b)).

[0107] Next, the hot doping method is used for lithium metal dopi...

Embodiment 1-2

[0112] The silicon oxide compound particles were coated with a carbon film layer using a process similar to that of Example 1-1, wherein the carbon film layer had a coverage rate of 96% and a thickness of 40 nm.

[0113] Next, configure a hydrofluoric acid solution with a concentration of 12mol / L, add the above-mentioned silicon-oxygen particles coated with a carbon film layer, and continue to react for 1 hour at a stirring speed of 500r / min to obtain silicon-oxygen particles with a porous shell. The carbon film layer remains intact, and at the same time no macropores can be seen from the outer surface of the particle (such as Figure 4 shown). Then observe the cross-section of the porous shell of the particle, as Figure 5As shown, it can be seen that the material mainly contains mesopores of 10-30nm; through nitrogen adsorption and desorption test analysis, it is found that the material also contains a small amount of micropores.

[0114] Next, the above silicon oxide powd...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention provides a negative electrode active material, a preparation method thereof, an electrode and a battery. The negative electrode active material includes negative electrode active material particles; the negative electrode active material particles include silicon oxide particles, lithium elements embedded in the silicon oxide compound particles and a carbon film layer, the silicon oxide compound particles include a core and a porous shell, and the surface part of the porous shell is Or completely covered by carbon film layer. The negative electrode active material used in the battery provided by the invention has the electrochemical characteristics of high efficiency, high energy density and small expansion when used. The battery prepared by using the negative electrode active material has the advantages of high energy density, excellent cycle performance, small cycle expansion, good high temperature performance and the like.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to a negative electrode active material for batteries, a preparation method thereof, an electrode, and a battery. 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 active material of commercial 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 elemental silicon negative electrode active 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 active m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/36H01M4/48H01M4/62H01M4/13H01M4/134H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M4/382H01M4/386H01M4/13H01M4/134H01M10/0525H01M2004/027H01M2004/021H01M2220/20H01M2220/30Y02E60/10
Inventor 罗姝李喆王岑张和宝查道松连芸芸叶兰
Owner BERZELIUS (NANJING) CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com