Negative electrode active material for non-aqueous electrolyte secondary battery and method for producing same

A technology of negative electrode active material and non-aqueous electrolyte, which is applied in the field of negative electrode active material for non-aqueous electrolyte secondary battery and its preparation, so as to improve cycle characteristics and initial charge and discharge efficiency, improve initial efficiency, and easy to assemble and disassemble. Effect

Pending Publication Date: 2020-07-17
DAEJOO ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to solve the problems of the existing secondary battery negative electrode active material as described above, the object of the present invention is to provide a non-aqueous electrolyte lithium secondary battery that improves charging and discharging capacity, initial charging and discharging efficiency and capacity retention rate. negative active material

Method used

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  • Negative electrode active material for non-aqueous electrolyte secondary battery and method for producing same
  • Negative electrode active material for non-aqueous electrolyte secondary battery and method for producing same
  • Negative electrode active material for non-aqueous electrolyte secondary battery and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1. Preparation of silicon oxide composites containing magnesium

[0046] Heat-treat 15kg of silicon powder and silicon dioxide (SiO 2 ) powder powder and 1.5kg of magnesium, the above silicon, silicon dioxide (SiO 2 ) of the mixed powder of silicon oxide vapor and magnesium vapor are simultaneously generated to react in the gas phase, cooled at a temperature of 700°C and then precipitated, and then crushed and classified with a jet mill to obtain an average particle size (D 50 ) is magnesium-silicon oxide composite powder of 6.3 μm.

[0047] In order to form a carbon-containing coating layer, the recycled silicon oxide composite powder containing magnesium is placed in argon (Ar) and methane (CH 4 ) in a mixed gas, and processed by chemical vapor deposition (CVD) for 2 hours to prepare a silicon oxide composite (sample 1).

[0048] It was confirmed from the above silica composite (sample 1) containing magnesium that the BET specific surface area was 6.2m 2 ...

Embodiment 2

[0049] Example 2. Preparation of silica composites containing magnesium

[0050] Except for precipitation after cooling at a temperature of 800°C, a silicon oxide composite containing 9% by weight of magnesium was prepared by the same method as in Example 1 above, and a carbon coating layer with a carbon content of 5% by weight was formed. SiO composite powder.

[0051] It was confirmed from the above silica composite (sample 2) containing magnesium that the BET specific surface area was 6.3m 2 / g, the specific gravity is 2.3g / cm 3 , average particle size (D 50 ) was 6.2 μm, and the size of silicon crystals measured by X-ray diffraction analysis (CuKα) was 8 nm.

Embodiment 3

[0052] Example 3. Preparation of silica composites containing magnesium

[0053] A silicon oxide composite containing 11.7% by weight of magnesium was prepared by the same method as in Example 1 above, except that precipitation was carried out after cooling at a temperature of 900° C., and a carbon coating with a carbon content of 10% by weight was prepared. layer of silicon oxide composite powder (sample 3).

[0054] It was confirmed from the above silica composite (sample 3) containing magnesium that the BET specific surface area was 5.8 m 2 / g, the specific gravity is 2.4g / cm 3 , average particle size (D 50 ) was 6.7 μm, and the size of silicon crystals measured by X-ray diffraction analysis (CuKα) was 11 nm.

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Abstract

The present invention relates to a negative electrode active material for a non-aqueous electrolyte secondary battery and a method for producing the same and, more particularly, to a negative electrode active material for a non-aqueous electrolyte secondary battery and a method for producing the same, where the negative electrode active material, by reacting silicon, silicon dioxide, and magnesiumby a gas phase reaction and coating carbon on a surface to impart conductivity thereto, exhibits a stable structure against change in volume due to occlusion and release of lithium, as well as conductivity, thereby exhibiting an effect of significantly improving characteristics of lifetime and capacity.

Description

technical field [0001] The present invention relates to a negative electrode active material for a nonaqueous electrolyte secondary battery and a preparation method thereof, and in more detail, to the following negative electrode active material for a nonaqueous electrolyte secondary battery and a preparation method thereof, that is, by making silicon, Silicon dioxide and magnesium react in the gas phase to prepare a silicon oxide composite, which not only improves electrical conductivity by coating carbon on the surface, but also exhibits a stable structure against volume changes caused by lithium occlusion / release, resulting in a large The effect of improving life characteristics and capacity efficiency characteristics. Background technique [0002] Recently, the lithium secondary battery, which has attracted attention as a power source for portable small electronic devices and electric vehicles, is a battery with high energy density. By using an organic electrolyte, it ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/58H01M4/62H01M10/0525C01B33/02C01B33/113C01B33/22
CPCY02E60/10C01B33/113C01B33/22H01M4/62H01M10/0525H01M2004/027H01M4/483H01M4/386H01M4/362H01M4/131H01M4/134H01M4/625H01M4/366H01M4/0471C01P2002/74C01P2004/61C01P2004/84C01P2006/12H01M4/364H01M4/485H01M4/5825C01B33/02H01M4/587H01M2004/021
Inventor 吴性旻
Owner DAEJOO ELECTRONICS MATERIALS CO LTD
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