Silicon oxide composite negative pole material for lithium ion secondary battery and preparation method thereof

A technology of silicon oxide and negative electrode materials, applied in the direction of battery electrodes, circuits, electrical components, etc., to reduce the hardness of materials, prevent material adhesion, and improve grinding efficiency

Active Publication Date: 2015-04-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a silicon oxide composite negative electrode material for a lithium-ion secondary battery and a preparation method thereof, which

Method used

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  • Silicon oxide composite negative pole material for lithium ion secondary battery and preparation method thereof
  • Silicon oxide composite negative pole material for lithium ion secondary battery and preparation method thereof
  • Silicon oxide composite negative pole material for lithium ion secondary battery and preparation method thereof

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Embodiment 1

[0027] The silicon oxide composite negative electrode material of a kind of lithium ion secondary battery of the present invention can be prepared by following method:

[0028] 1) Mix silica powder, magnesium powder and NaCl powder with a mass ratio of 1:0.4:10 by ball milling. The ball milling conditions are as follows: the rotation speed is 400rpm, the ball milling time is 5h, and the ball-to-material ratio is 10:1; Argon atmosphere protection Carry out magnesia thermal reduction reaction at 500°C for 4 hours, and the heating rate is 5°C / min. After cooling down to room temperature, use an excess of 0.5mol / L HCl to stand for corrosion, filter and wash, and vacuum dry to obtain silicon oxide.

[0029] 2) Mix the silicon oxide and natural graphite prepared above in a mass ratio of 10:2.5 in a planetary ball mill under the protection of an argon atmosphere. The ball milling conditions are: the rotating speed is 400rpm, the ball milling time is 20h, and the ball-to-material ratio...

Embodiment 2

[0037] 1) SiO2 powder, magnesium powder and MgCl with a mass ratio of 1:0.37:8 2 The powder is mixed by ball milling. The ball milling conditions are as follows: the rotation speed is 500rpm, the ball milling time is 1h, and the ball-to-material ratio is 5:1; the magnesia thermal reduction reaction is carried out under the protection of argon atmosphere, and the temperature is kept at 600°C for 2h, and the heating rate is 20°C / min. , after cooling down to normal temperature, use excess 0.5mol / L HCl to statically etch, filter and wash with suction, and dry in vacuum to obtain silicon oxide.

[0038] 2) Mix the silicon oxide and natural graphite prepared above in a mass ratio of 10:1 in a planetary ball mill under the protection of an argon atmosphere. The ball milling conditions are as follows: the rotating speed is 500rpm, the ball milling time is 1h, and the ball-to-material ratio is 10 : 1, a mixture was obtained. Then, under the protection of an argon atmosphere, the above...

Embodiment 3

[0043] 1) SiO2 powder, magnesium powder and CaCl with a mass ratio of 1:0.32:1 2 The powders are mixed by ball milling, the ball milling conditions are as follows: the rotation speed is 300rpm, the ball milling time is 30h, and the ball-to-material ratio is 20:1; the magnesia thermal reduction reaction is carried out under the protection of argon atmosphere, the temperature is kept at 400°C for 5h, and the heating rate is 5°C / min , after cooling down to normal temperature, use excess 0.5mol / L HCl to statically etch, filter and wash with suction, and dry in vacuum to obtain silicon oxide.

[0044] 2) Mix the silicon oxide and mesophase graphite prepared above in a mass ratio of 10:4 in a planetary ball mill under the protection of an argon atmosphere. The ball milling conditions are: the rotating speed is 300rpm, the ball milling time is 30h, and the ball-to-material ratio is 20:1, a primary mixture was obtained. Then, under the protection of an argon atmosphere, the primary m...

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Abstract

The invention relates to a silicon oxide composite negative pole material for a lithium ion secondary battery and a preparation method thereof. The composite material consists of silicon oxide, graphite type carbon materials and amorphous carbon materials. The preparation method comprises the following steps: performing magnesiothermic reduction on silicon dioxide so as to generate the silicon oxide by using alkaline(soil) metal chloride as a heat absorbent; after performing acid corrosion, sucking filtration, washing and vacuum drying on the silicon oxide, performing pre-ball milling on the dried silicon oxide and graphite; then complementing an organic carbon source, performing secondary ball milling, and then performing high-temperature heat treatment so as to obtain the silicon oxide composite negative pole material. The oxygen content of the silicon oxide is controlled by regulating the proportion of the silicon dioxide to magnesium, and then the silicon oxide is uniformly mixed with the graphite type carbon materials and the organic carbon source. The silicon oxide composite negative pole material disclosed by the invention has the characteristics of a higher first-time Kulun efficiency, a high specific capacity, a better cycle performance and the like; the preparation method adopted by the invention is easy in operation, simple in technology, low in cost and suitable for the industrial mass production.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion secondary battery and a preparation technology thereof, in particular to a silicon oxide composite negative electrode material of a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have become a key research direction in the world due to their advantages such as large specific energy, long cycle life, and less environmental pollution. At present, the anode materials of lithium-ion secondary batteries that have successfully achieved large-scale commercialization mainly use graphite-based carbon materials. However, the maximum theoretical specific capacity of this type of material is only 372mAh / g, which is difficult to meet the requirements of high-energy power supply. Among the non-carbon anode materials, silicon has the highest theoretical specific capacity (about 3800mAh / g), which is close to 10 times t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/139
CPCH01M4/139H01M4/1391H01M4/36H01M4/48Y02E60/10
Inventor 杨化滨吴文骏马海燕
Owner NANKAI UNIV
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