A kind of negative electrode active material and its preparation method and a kind of lithium ion battery

A negative electrode active material and technology of negative electrode materials, applied in the field of negative electrode active materials and their preparation, can solve the problems that negative electrode active materials are difficult to have high specific capacity cycle performance, and achieve structural stability, reduce surface energy, and inhibit agglomeration Effect

Active Publication Date: 2015-08-26
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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  • A kind of negative electrode active material and its preparation method and a kind of lithium ion battery
  • A kind of negative electrode active material and its preparation method and a kind of lithium ion battery
  • A kind of negative electrode active material and its preparation method and a kind of lithium ion battery

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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 embodiment 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 at the same time 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, put the mixed solution in a volumetric flask, put it in a water bath, heat up to 85°C and keep stirring, take 5g of EDTA and add Make 250ml solution of ionized water and add it into the volumetric flask, adjust the pH value of the solution to 10 with NaOH, stir at a constant temperature of 85°C for 2 hours to obtain a mixed system; then take 12.9 grams of CoCl 2 Dissolve in 500ml deionized water and then slowly drop into the volumetric flask for reaction to generate water-insoluble cobalt stannate (CoSnO 3 ), until the precipitation is complete to ...

Embodiment 2

[0067] This embodiment 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 Repeatedly washing with water 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 at a mass ratio of 10:1, and take 21.3g of Na at the same time 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, put the mixed solution in a volumetric flask, put it in a water bath, heat up to 85°C and keep st...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/0525C01G19/00
CPCY02E60/122Y02E60/10
Inventor 李世彩谢呈德
Owner BYD CO LTD
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