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Compound and preparation method thereof as well as negative electrode prepared by adopting compound and lithium ion battery

A compound and mixture technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low efficiency, achieve good dispersion uniformity, avoid precipitation, and improve Coulombic efficiency

Active Publication Date: 2017-01-25
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its initial charge and discharge efficiency is below 77%, which is still relatively low and cannot meet the needs of practical applications.

Method used

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  • Compound and preparation method thereof as well as negative electrode prepared by adopting compound and lithium ion battery
  • Compound and preparation method thereof as well as negative electrode prepared by adopting compound and lithium ion battery
  • Compound and preparation method thereof as well as negative electrode prepared by adopting compound and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Synthesis of the complex:

[0076] (1) Take 5Kg Si powder, 10Kg SiO 2 Powder, put into VC mixer and mix for 30min to get SiO 2 and the mixture of Si, the mixture is put into the end of the vacuum furnace near the end of the furnace as a raw material for preparing silicon oxide;

[0077] (2) get 10Kg dolomite, 5Kg ferrosilicon powder, after dropping into VC mixer and mix 30min, obtain the mixture of 15Kg dolomite and ferrosilicon powder, put this mixture into the vacuum furnace as the raw material of preparing Mg near the end of furnace mouth;

[0078] (3) A collector is placed in the collection chamber, heated to 1350°C under a negative pressure of 3 Pa and kept warm for 24 hours, so that SiO vapor and Mg vapor are generated in the furnace, and the uniformly mixed gaseous mixture undergoes rapid condensation (condensed The temperature is 900°C) to generate SiOx-Mg material, named as modified SiO X After the reaction, the equipment was cooled and 15Kg of product was c...

Embodiment 2

[0092] Except in the synthesis process of the composite, the operation of step (1) and step (2) is changed to: the obtained SiO 2 The mixture with Si and the obtained raw materials for preparing Mg are first mixed, and then the mixed mixture is put into a vacuum furnace. Other preparation methods and conditions are the same as in Example 1.

[0093] Compound tests:

[0094] Use X-ray diffractometer to carry out qualitative analysis to the compound that present embodiment makes, and detection result is the same as that in embodiment 1 figure 1 Similarly, the characteristic peaks of magnesium silicate formed after the reaction of Mg and SiO and the characteristic peaks of Si appeared in the prepared composite, but the peak of Mg did not appear. Silicon oxide SiO x (0<x≤2) is amorphous and thus not shown in the XRD pattern.

[0095] In the compound that the present invention obtains, comprise silicon, silicon oxide SiO x , 0<x≤2, magnesium silicate, does not contain Mg elemen...

Embodiment 3

[0101] Except in the synthetic process of composite, the operation of step (1) and step (2) is replaced as: replace the raw material of preparing Mg with 2Kg magnesium powder, and it is mixed with the obtained SiO 2 Mix evenly with the mixture of Si, put into vacuum furnace, other preparation methods and conditions are identical with embodiment 1.

[0102] Compound tests:

[0103] Use X-ray diffractometer to carry out qualitative analysis to the complex that the present embodiment makes, and detection result is the same as that in Example 1. figure 1 Similarly, the characteristic peaks of the silicate formed after the reaction of Mg and SiO and the characteristic peaks of Si appeared in the prepared composite, but the peak of Mg did not appear.

[0104] Silicon oxide SiO x (0<x≤2) is amorphous and thus not shown in the XRD pattern.

[0105] In the compound that the present invention obtains, comprise silicon, silicon oxide SiO x , 0<x≤2, magnesium silicate, does not contai...

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Abstract

The invention relates to a compound and a preparation method thereof as well as a negative electrode prepared by adopting the compound and a lithium ion battery. The compound comprises silicon, silicon oxide SiOx (x is greater than 0 and is less than or equal to 2) and silicate, wherein positive ion elements of the silicate are reductant elements, and Si, O and the reductant elements in the compound are uniformly distributed. Reductants used in the compound are heated and insulated in the environment of negative pressure, so that SiO steam reacts with reductant steam in the form of a gas phase so as to condense to obtain the compound, and then the compound is further used as a raw material so as to prepare a modified silica negative electrode material. The negative electrode material is suitable for the lithium ion battery, the prepared lithium ion battery has high charge and discharge specific capacity and excellent first coulombic efficiency, the charge capacity is 1447 mAh / g or above, the discharge capacity is 1213 mAh / g or above, and the first coulombic efficiency is 83.8% or above.

Description

technical field [0001] The invention belongs to the field of energy storage materials and electrochemistry, and relates to a composite, a preparation method thereof, a negative electrode and a lithium ion battery prepared by using the composite. Background technique [0002] As electronic products such as mobile phones, notebooks, digital cameras and miniature cameras have higher and higher requirements for energy supply equipment, especially the rapid development of power vehicles such as electric vehicles, it is particularly urgent to develop new green high-energy chemical power sources. Lithium-ion batteries have become a research hotspot due to their advantages in specific capacity, high charge-discharge efficiency, good cycle performance and low cost. As an important part of lithium-ion batteries, negative electrode materials affect the specific energy and cycle life of lithium-ion batteries, and have always been the focus of lithium-ion battery research. [0003] Sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M10/0525
CPCH01M4/364H01M4/386H01M4/483H01M4/5825H01M10/0525Y02E60/10
Inventor 庞春雷石晓太任建国岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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