Negative electrode active material and its preparation method and application

A negative electrode active material and a lithium intercalation technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of difficult commercial application of lithium-ion secondary batteries, complex and dangerous preparation process, low capacity and coulombic efficiency, etc. Achieve high capacity and coulombic efficiency, good cycle stability, good rate and cycle performance

Active Publication Date: 2021-06-04
BERZELIUS (NANJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing silicon-oxygen anode materials generally have problems such as low capacity and coulombic efficiency, poor rate performance, poor cycle stability, complex and dangerous preparation process, and incompatibility with the currently commonly used aqueous homogenate system. Commercial application in secondary batteries

Method used

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  • Negative electrode active material and its preparation method and application
  • Negative electrode active material and its preparation method and application
  • Negative electrode active material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Under the protection of high-purity argon atmosphere, silicon oxide particles with a median particle size of 6 μm and a silicon-oxygen atomic ratio of 1:1 were initially mixed with metal lithium sheets at a mass ratio of 12:1, and the subsequent reaction was carried out at under the protection of high-purity argon atmosphere. Add a solution of methyl tert-butyl ether dissolved in naphthalene with a concentration of 0.3mol / L and keep stirring, wherein the molar ratio of naphthalene to lithium flakes is 1:40. The reaction was warmed to a constant temperature of 70 °C. After the lithium flakes floating on the liquid surface completely disappeared, the reaction was continued at 70°C for 30 minutes, and then naturally cooled to room temperature.

[0120] Under the protection of a high-purity argon atmosphere, a volume of liquid paraffin equal to that of the methyl tert-butyl ether solution was added to the reaction system and the temperature was raised to 100° C. for 30 min...

Embodiment 2

[0131] Weigh 2000g of silicon oxide particles with a median particle size of 6 μm and a silicon-oxygen atomic ratio of 1:1, and then use a heating VC mixer to uniformly mix it with petroleum asphalt at a mass ratio of 15:1 to achieve the asphalt coating. cover. The obtained product was transferred into a box furnace, and the temperature was raised to 950°C at 5°C / min under a high-purity nitrogen atmosphere for 2 hours to achieve in-situ carbonization of the petroleum pitch coating film 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.

[0132] Under the protection of a high-purity argon atmosphere, the material obtained in the previous step was initially mixed with the metal lithium wire at a mass ratio of 10:1, and the entire subsequent reaction was carried out under the protection of a high-purity argon atmosphere. A solution of ethylene glycol dimethyl ether with...

Embodiment 3

[0141] Weigh 500g of silicon oxide particles with a median particle size of 6 μm and a silicon-oxygen atomic ratio of 1:1, zinc acetate dihydrate, glucose, and polyvinylpyrrolidone in a mass ratio of 10:0.5:1:0.1 and uniformly disperse them in 1000ml of ethanol / water mixed solvent, wherein the volume ratio of ethanol and water is 5:1. The resulting dispersion was continuously stirred at 60°C until viscous, then dried and coarsely crushed, and then transferred to a tube furnace. Then, in a high-purity nitrogen atmosphere, the temperature was raised to 800°C at 10°C / min and kept for 4 hours to achieve zinc element doping and glucose carbonization to form a film and coat the surface of the material. After the treatment, the resulting material was crushed and passed through a 500-mesh sieve for subsequent operations.

[0142] Under the protection of high-purity argon atmosphere, the material obtained in the previous step was initially mixed with metal lithium powder at a mass ra...

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Abstract

The present disclosure relates to a negative electrode active material and a preparation method and application thereof. The negative electrode active material includes: silicon oxide particles; and elemental silicon nanoparticles dispersed in the silicon oxide particles; wherein, the median diameter of the elemental silicon nanoparticles is 0.2-20nm; the silicon oxide particles contain lithium, silicon The lithium in the oxide particles includes lithium silicate compounds, and the lithium silicate compounds include Li 2 Si 2 o 5 , Li 6 Si 2 o 7 , Li 2 SiO 3 , Li 8 SiO 6 and Li 4 SiO 4 one or more of. The negative electrode active material of the present disclosure has the advantages of high capacity and coulombic efficiency, good rate and cycle performance, and low expansion rate when used in a secondary battery. The preparation method has good repeatability and high safety. The secondary battery provided by the present disclosure has the characteristics of high volumetric energy density, good rate performance, good cycle stability, and low expansion rate.

Description

technical field [0001] The disclosure relates to the field of batteries, in particular to a negative electrode active material and a preparation method and application thereof. Background technique [0002] Among different types of secondary batteries, lithium-ion secondary batteries have attracted much attention due to their advantages such as high voltage, low self-discharge rate, no memory effect, light weight, and small size, and have been widely used in many fields. In recent years, in order to further develop high-capacity lithium-ion secondary batteries, high-capacity silicon-based anode materials have gradually become a research hotspot. [0003] Among silicon-based anode materials, silicon oxide has obvious advantages in terms of expansion rate and cycle stability, and is easier to realize large-scale applications, although its theoretical capacity is lower than that of simple silicon materials. However, silicon oxides consume lithium to generate lithium silicate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/5825H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 查道松李喆罗姝汪芳张和宝王岑
Owner BERZELIUS (NANJING) CO LTD
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