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Silicon-based Si-B-C anode material prepared based on CO2 and preparation method thereof, and application of silicon-based Si-B-C anode material

A negative electrode material, si-b-c technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as effective progress and control of adverse reactions

Active Publication Date: 2020-01-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium-silicon alloy is also a strong reducing agent. The reduction is an exothermic reaction. A large amount of heat is released during the reaction, which will cause the calcium-silicon alloy to sinter into large particles, which is not conducive to the effective progress and control of the reaction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A CO based 2 The preparation method of the prepared silicon-based Si-B-C negative electrode material is carried out in the following steps:

[0065] (1) drying boron oxide and calcium chloride to remove moisture;

[0066] (2) Under the protection of an inert gas, weigh 6.5g±0.1g silicon-calcium alloy, weigh 1.5g±0.1g boron oxide, grind and mix to obtain silicon-calcium alloy-boron oxide;

[0067] (3) Under the protection of an inert gas, weigh 75.0g ± 0.1g of calcium chloride, and grind it evenly;

[0068] (4) mix silicon-calcium alloy-boron oxide and calcium chloride evenly to obtain mixed salt, and pack into a ziplock bag for sealing;

[0069] (5) Put the mixed salt into the graphite crucible embedded in the reactor, and seal the reactor cover.

[0070] (6) Inert gas is passed into the air inlet of the reactor cover, and the inert gas is discharged from the air outlet of the reactor cover to ensure positive pressure in the reactor;

[0071] (7) The resistance wire...

Embodiment 2

[0080] A CO based 2 The preparation method of the silicon-based Si-B-C negative electrode material of preparation, with embodiment 1, difference is:

[0081] (1) In step (8), during the molten salt reaction, CO 2 The time is 2h, and the standing time is 5h; other methods are the same.

Embodiment 3

[0083] A CO based 2 The preparation method of the silicon-based Si-B-C negative electrode material of preparation, with embodiment 1, difference is:

[0084] (1) In step (8), during the molten salt reaction, CO 2 The time is 2h, and the standing time is 2h; the other methods are the same.

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PUM

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Abstract

The invention discloses a silicon-based Si-B-C anode material prepared based on CO2 and a preparation method thereof, and application of a silicon-based Si-B-C anode material, and belongs to the fieldof preparation of battery negative electrode materials. The silicon-based Si-B-C anode material is prepared on the basis of CO2, a silicon-calcium alloy, carbon dioxide and boron-containing oxide areused as raw materials, the silicon-based Si-B-C anode material is synthesized in calcium chloride-based or calcium chloride-magnesium chloride-based molten salt, stirring can be assisted in the synthesis process, and the synthesized silicon-based Si-B-C anode material is used as the lithium ion battery anode material, so that the specific capacity and the cycle performance of the lithium ion battery anode material can be improved. The preparation method is low in cost and simple to operate.

Description

technical field [0001] The invention relates to the field of preparation of battery negative electrode materials, in particular to a CO-based 2 The prepared silicon-based Si-B-C negative electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used due to their advantages such as high energy density, long cycle life, and no memory effect. With the development of new energy vehicles and new energy power generation technologies, lithium-ion power batteries for vehicles and lithium-ion batteries for energy storage have become an urgent need. The current commercial lithium-ion battery negative electrode material is graphite, and its theoretical specific capacity is only 372mAh / g, which is difficult to meet the needs of high-performance and high-capacity lithium-ion batteries. Silicon material has become the focus of research because of its large theoretical specific capacity of 4200mAh / g. However, it s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/38H01M4/386H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 谢宏伟董函晴王锦霞尹华意宋秋实宁志强
Owner NORTHEASTERN UNIV