Negative electrode material and preparation method thereof, electrode and secondary battery

A negative electrode material and secondary battery technology, applied in secondary batteries, negative electrodes, battery electrodes, etc., can solve problems such as consumption, poor rate performance, and electrolyte consumption, and achieve high lithium ion conductivity and high structural stability , the effect of improving conductivity

Inactive Publication Date: 2021-03-09
AMPRIUS NANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the silicon oxide compound material intercalates lithium for the first time, a thicker SEI film is often formed on the surface due to more side reactions with the electrolyte. At the same time, lithium is also consumed to form lithium silicate and lithium oxide, and the consumed Lithium cannot be released again during discharge, which makes silicon oxide materials generally face the bottleneck of low initial Coulombic efficiency, which also limits the further improvement of battery energy density
At the same time, although the expansion of the silicon oxide compound during the cycle is significantly lower than that of the simple silicon anode, the particle breakage will still occur during the long-term cycle and the electrolyte will be further consumed, so the cycle retention rate still needs to be improved.
In addition, the ionic and electronic conductivity of silicon oxide compounds is usually relatively low, so that the lithium delithiation and lithium intercalation reactions during the first charge and discharge process are not sufficient, resulting in low Coulombic efficiency, poor rate performance and poor battery performance during subsequent cycles. Problems such as poor cycle retention

Method used

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  • Negative electrode material and preparation method thereof, electrode and secondary battery
  • Negative electrode material and preparation method thereof, electrode and secondary battery
  • Negative electrode material and preparation method thereof, electrode and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Weigh 2000g of silicon-oxygen compound particles with a median particle size of 8 μm and a silicon-oxygen atomic ratio of 1:1 and place them in a CVD furnace, and feed high-purity argon gas into the furnace at a gas velocity of 500ccm throughout the subsequent process. First raise the temperature of the system to 900°C at 5°C / min and keep it for 60min, then pass acetylene into the furnace at a gas velocity of 300ccm for 60min for carbon film coating, then keep it at 900°C for 1 hour and then cool down to room temperature to get Silicon oxide particles with a carbon film layer are ready for subsequent operations.

[0121] Weigh 500g of the above-mentioned silicon oxide compound particles with a carbon film layer, and uniformly disperse them in 1000ml of ethanol with a mass ratio of 30:1 through a high-speed dispersing disc with niobium oxide with a median particle size of about 1 μm. Subsequently, the resulting dispersion was continuously stirred at 150° C. until viscous...

Embodiment 2

[0129] The silicon oxide compound particles were coated with a carbon film by the same CVD process as in Example 1, and then passed through a 500-mesh sieve for later use. The silicon-oxygen compound particles with the carbon film layer obtained in the previous step and lithium hydride fine powder were uniformly mixed in a VC mixer for 30 minutes at a mass ratio of 10:1, and then transferred to a tube furnace, and heated under a high-purity argon atmosphere to Raise the temperature at 3°C / min to 750°C and keep for 6 hours. After natural cooling, pass through a 500-mesh sieve for subsequent operations.

[0130] Weigh 500g of the material obtained in the previous step, and uniformly disperse it in 1000ml of isopropanol through a high-speed dispersing disc at a mass ratio of 30:1 with niobium oxide with a median particle size of about 1 μm. Subsequently, the resulting dispersion was continuously stirred at 150° C. until viscous, then dried and coarsely crushed, and then passed th...

Embodiment 3

[0138] Weigh 2000g of silicon-oxygen compound particles with a median particle size of 7 μm and a silicon-oxygen atomic ratio of 1:1, and use a heating VC mixer to uniformly mix it with petroleum asphalt at a mass ratio of 15:1 to realize the production of petroleum asphalt. clad. The obtained product was transferred into a box furnace, and the temperature was raised to 1000°C at a rate of 5°C / min under a high-purity nitrogen atmosphere for 2h to realize in-situ carbonization of the asphalt-coated film layer on the surface of silicon oxide particles. After the treatment, the resulting material was crushed and passed through a 500-mesh sieve for subsequent operations.

[0139] Completely dissolve 0.13 mol ammonium niobium oxalate in a mixed solvent of 2000 mL of ethanol and water for later use, weigh 1000 g of silicon oxide particles with a carbon film layer obtained in the previous step and uniformly disperse them in the above ammonium niobium oxalate solution through a high-s...

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Abstract

The present application provides a negative electrode material for a secondary battery, and the negative electrode material comprises silica compound particles containing a lithium element and elemental silicon nanoparticles; a carbon film layer, wherein the surfaces of the silica compound particles are coated with the carbon film layer; and a niobium-containing coating layer which coats the surfaces of the silica compound particles with the carbon film layer, wherein the niobium-containing coating layer comprises a lithium niobate compound. The negative electrode material has high specific capacity, high coulombic efficiency, excellent rate capability and good cycling stability.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to a negative electrode material, a preparation method thereof, an electrode, and a secondary battery. Background technique [0002] In recent years, while mobile terminals and electric vehicles have become increasingly popular and updated, secondary batteries as their power supply sources are also facing higher development requirements. Among different types of secondary batteries, lithium-ion secondary batteries have attracted much attention and are widely used in many fields due to their advantages such as high voltage, low self-discharge rate, no memory effect, light weight, and small size. [0003] At present, graphite anode materials with limited theoretical capacity have been almost fully developed, while silicon-based anode materials have become a research hotspot due to their remarkable high capacity advantages, and are gradually moving from laboratory research and devel...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/5825H01M4/624H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 查道松王岑罗姝张和宝李喆骆亦琦
Owner AMPRIUS NANJING CO LTD
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