Negative pole active material, preparation method thereof and lithium-ion battery

A technology of negative electrode active materials and properties, which is applied in the field of negative electrode active materials and their preparation, can solve the problem that negative electrode active materials are difficult to have high specific capacity and cycle performance, and achieves structural stability, reducing surface energy, and inhibiting agglomeration. Effect

Active Publication Date: 2013-04-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the negative electrode active materials in the prior art are difficult to have both high specific capacity and good cycle performance

Method used

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  • Negative pole active material, preparation method thereof and lithium-ion battery
  • Negative pole active material, preparation method thereof and lithium-ion battery
  • Negative pole active material, preparation method thereof and lithium-ion battery

Examples

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preparation example Construction

[0028] Specifically, the preparation method of the negative electrode active material of the present invention comprises the following steps:

[0029] Step 1: Surface treatment of graphite;

[0030] This step is a preferred step, and the graphite with oxygen-containing active groups on the surface is obtained by surface treatment of the graphite. The graphite can be selected from graphite materials known in the art, and preferably, spherical graphite or flake graphite can be selected. The surface treatment is specifically immersing graphite in acid or alkali for acidification or alkalization treatment. On the one hand, the surface treatment of graphite can remove incompatible groups on the graphite surface, such as hydrophilic and oil-repellent groups; on the other hand, it can improve the flatness of the graphite surface, thereby improving the adhesion between stannate and graphite. The conditions for the acidification or alkalization treatment are as follows: under the con...

Embodiment 1

[0063] This example is used to illustrate the negative electrode active material disclosed in the present invention and its preparation method;

[0064] 1) Mix 100g of graphite G with organic polymer polyvinyl alcohol 2000, the mass ratio is 10:1, and take 21.3g of Na 2 SnO 3 Dissolve in water to make a solution, add it to the above mixture, mix and stir to obtain a mixed solution with a total volume of 2000ml, place the mixed solution in a volumetric flask and put it in a water bath and heat it up to 85°C and keep stirring, take 5g of EDTA and add it Ionized water was made into a 250ml solution and added to the volumetric flask. The pH value of the solution was adjusted to 10 with NaOH, and stirred at a constant temperature of 85°C for 2 hours to obtain a mixed system; then 12.9 grams of CoCl was taken. 2 Dissolve in 500ml of deionized water and slowly drop it into a volumetric flask for reaction to generate water-insoluble cobalt stannate (CoSnO 3 ), until the precipitatio...

Embodiment 2

[0067] This example is used to illustrate the negative electrode active material disclosed in the present invention and its preparation method;

[0068] 1) Pour 500g of sulfuric acid with a concentration of 67% into a glass container, place the glass container in a water bath at 80°C, add 50g of graphite G after 30 minutes, keep warm and stir for 2.5 hours; then deionize the graphite suspension with Washing with water repeatedly until the pH value of the suspension is 7-8, and then baking the filtered graphite at 60 °C for 12 hours to obtain surface-functionalized graphite OG;

[0069] 2) Mix 100g of surface functionalized graphite OG with organic polymer polyvinyl alcohol 2000, the mass ratio is 10:1, and at the same time take 21.3g of Na 2 SnO 3 Dissolve in water to make a solution, add it to the above mixture, mix and stir to obtain a mixed solution with a total volume of 2000ml, place the mixed solution in a volumetric flask and put it in a water bath and heat it up to 85...

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Abstract

The invention provides a negative pole active material. The negative pole active material comprises a core body and a plurality of modified bodies attached to the external surface of the core body, wherein the core body is made from graphite and the modified bodies are made from stannate. The invention further provides a preparation method of the negative pole active material, which comprises the following steps of: mixing the graphite with aqueous liquid of soluble stannate, and adding an organic polymer and a complexing agent, thereby obtaining a mixed system; then dropwise adding aqueous liquid of a soluble metal salt into the mixed system, producing water-insoluble stannate as the soluble metal salt reacts with the soluble stannate, obtaining a precursor suspension after completing precipitation, and obtaining a precursor after filtering and drying; and carrying out heat treatment on the precursor, thereby obtaining the negative pole active material. The invention further relates to a lithium-ion battery containing the negative pole active material. The negative pole active material prepared by adopting the preparation method provided by the invention has the advantages of high capacity, stable structure and high charge-discharge cyclical stability.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, to a negative electrode active material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and good safety performance. At present, lithium-ion batteries have been used as the main power supply for mobile communication equipment and portable electronic equipment. At the same time, due to their excellent output voltage and high energy density Performance has become a research hotspot at home and abroad. At present, the negative electrode active material of commercialized lithium-ion batteries is mainly graphite. During the process of lithium intercalation and delithiation, the volume change of graphite is small, so it has good cycle performance. Graphite via LiC 6 Compounds reversibly store Li + , its theoretical mass-specific capacity is only 372 mA·h / g, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139H01M10/0525C01G19/00
CPCY02E60/10
Inventor 李世彩谢呈德
Owner BYD CO LTD
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