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Carbon-coated silicon-based titanium-niobium composite material and preparation method thereof and lithium ion battery

A composite material and carbon coating technology, applied in the preparation/purification of carbon, niobium compounds, secondary batteries, etc., can solve problems such as poor stability, and achieve the effect of improving electrical contact, small volume effect, and high cycle performance

Pending Publication Date: 2020-05-19
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a carbon-coated silicon-based titanium-niobium composite material, its preparation method and lithium-ion battery, so as to solve the problem of poor stability of silicon materials in the charging and discharging process of lithium-ion batteries

Method used

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  • Carbon-coated silicon-based titanium-niobium composite material and preparation method thereof and lithium ion battery
  • Carbon-coated silicon-based titanium-niobium composite material and preparation method thereof and lithium ion battery
  • Carbon-coated silicon-based titanium-niobium composite material and preparation method thereof and lithium ion battery

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preparation example Construction

[0024] As described in the background art, the problem of poor stability of silicon materials in the charging and discharging process in existing lithium-ion batteries. In order to solve the above technical problems, the present application provides a method for preparing a carbon-coated silicon-based titanium-niobium composite material, the preparation method comprising: using titanium source and niobium source as raw materials to perform the first calcination process to obtain the first calcined product, The temperature of the first calcination process is 800-1200°C; the silicon source, the first calcination product and the carbon source are subjected to the second calcination process to obtain a carbon-coated silicon-based titanium-niobium composite material, and the temperature of the second calcination process is 500-1000 °C ℃; wherein, the titanium source is selected from one or more of anatase titanium dioxide, anatase titanium dioxide hydrate silicon powder and silicon ...

Embodiment 1

[0044] A method for preparing a carbon-coated silicon-based titanium-niobium composite material comprises:

[0045] Weigh deionized water, 400gNb 2 o 5 (1.50mol) and 139.57gTiO 2 2H 2 O (1.20mol) is mixed and prepared into a slurry with a solid content of 13%; the slurry is subjected to the first wet grinding to obtain the first slurry, wherein the grinding power is 10kwh / kg, and the particle size D50≤0.2μm; The first slurry is subjected to the first spray drying, the inlet temperature of the spray drying device used is 220°C, and the outlet temperature is 100°C.

[0046] The spray-dried material is subjected to a first calcination process in air, wherein the temperature of the first calcination process is 1100° C., and the sintering time is 6 hours. The product of the first calcining process is screened with a 200-mesh screen to obtain the first calcined product (titanium niobium oxide material).

[0047] Mix 400g of silicon powder with absolute ethanol to prepare a sili...

Embodiment 2

[0052] The difference from Example 1 is: the temperature of the first calcination process is 800°C, the temperature of the second calcination process is 1000°C, and the performance test method is the same as that of Example 1.

[0053] The charge and discharge rate is 0.1C, the first discharge gram capacity is 1030.2mAh / g, and the gram capacity after 50 cycles is 308mAh / g.

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Abstract

The invention provides a carbon-coated silicon-based titanium-niobium composite material and a preparation method thereof, and a lithium ion battery. The preparation method comprises the following steps: with a titanium source and a niobium source as raw materials, carrying out a primary calcination process to obtain a first calcination product, wherein the temperature of the primary calcination process ranges from 800 DEG C to 1200 DEG C; and subjecting a silicon source, the first calcination product and a carbon source to a secondary calcining process so as to obtain the carbon-coated silicon-based titanium-niobium composite material, wherein the temperature of the secondary calcining process is 500-1000 DEG C, the titanium source is one or more selected from the group consisting of anatase titanium dioxide, anatase titanium dioxide hydrate silicon powder and silicon monoxide, the niobium source is niobium pentoxide, the silicon source is silicon powder or silicon monoxide, and the carbon source is hydrocarbon. The carbon-coated silicon-based titanium-niobium composite material prepared by adopting the method has a relatively small volume effect and relatively high cycle performance in the charging and discharging processes; and meanwhile, the preparation method also has the advantages of simple process, no pollution, high repeatability, large-scale production and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion battery preparation, in particular to a carbon-coated silicon-based titanium-niobium composite material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Silicon is currently known as the lithium-ion battery anode material with the highest specific capacity (4200mAh / g). Compared with traditional graphite anode materials, the weight specific capacity of silicon is extremely high, which is more than ten times that of natural graphite; compared with metal lithium, silicon also has a high Compared with carbon materials, silicon has a higher lithium-deintercalation potential, which effectively avoids the precipitation of lithium during high-rate charging and discharging, thereby improving the safety of the battery. Based on the above advantages, silicon material is considered to be the most promising anode material for a new generation of high-energy lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00C01B33/02C01B32/05H01M4/38H01M4/62H01M10/0525H01M10/058
CPCC01G33/00C01B33/02C01B32/05H01M4/386H01M4/62H01M4/625H01M10/0525H01M10/058C01P2004/80C01P2004/03C01P2002/72C01P2006/40Y02E60/10Y02P70/50
Inventor 杜孟衣赵晓磊雷磊高学华李盼高学博成信刚
Owner NORTHERN ALTAIR NANOTECH CO LTD
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