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Silicon-based Si-C negative electrode material prepared based on calcium carbonate and preparation method and application thereof

A negative electrode material, calcium carbonate technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve disadvantages and other problems, achieve the effect of improving electrical conductivity, simple operation process, and improving electrochemical performance

Active Publication Date: 2019-12-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium-silicon alloy is a strong reducing agent here, and 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

[0051] A method for preparing a silicon-based Si-C negative electrode material prepared based on calcium carbonate, the steps are as follows;

[0052] (1) Take calcium-silicon alloy, wherein the particle size of calcium-silicon alloy is 500um~3mm;

[0053] (2) Calcium carbonate, calcium chloride, magnesium chloride salt are dried to remove moisture;

[0054] (3) Under the protection of argon gas, grind 6.4g±0.1g calcium silicide, 3.34g±0.1g calcium carbonate, 100±0.1g calcium chloride, 100±0.1g magnesium chloride salt in a ceramic mortar for 1h , after mixing evenly, put it into a ziplock bag and seal it;

[0055] (4) Put the mixed salt into the nickel crucible embedded in the reactor, and seal the reactor cover.

[0056] (5) Argon gas is introduced from the air inlet of the reactor cover, and the argon gas is discharged from the air outlet of the reactor cover to ensure positive pressure in the reactor;

[0057] (6) Turn on the resistance wire furnace to heat up;

[0058]...

Embodiment 2

[0073] A method for preparing a silicon-based Si-C negative electrode material prepared based on calcium carbonate, the same as in Example 1, the difference is:

[0074] (1) In step (3), the magnesium chloride quality is 200g;

[0075] (2) In step (7), the synthesis temperature is 700°C;

[0076] The other methods are the same, and the silicon-based Si-C negative electrode material with a particle size of 1 to 38 microns is prepared, and the prepared silicon-based Si-C negative electrode material is used as the lithium-ion battery negative electrode material to assemble lithium-ion batteries using the preparation method of Application Example 1. Battery, after electrochemical test, the first discharge specific capacity of the lithium-ion battery made by it is 2766.5mAh·g -1 , the Coulombic efficiency is 78%, and after 400 cycles, the reversible cycle specific capacity of the battery is 1325.1mAh g -1 , the Coulombic efficiency was maintained at 99%.

Embodiment 3

[0078] A method for preparing a silicon-based Si-C negative electrode material prepared based on calcium carbonate, the same as in Example 1, the difference is:

[0079] (1) In step (3), the molten salt is replaced with 100g calcium chloride, 100g potassium chloride;

[0080] (2) In step (7), the synthesis temperature is 800°C;

[0081] The other methods are the same, and the silicon-based Si-C negative electrode material with a particle size of 6 to 50 microns is prepared, and the prepared silicon-based Si-C negative electrode material is used as the lithium-ion battery negative electrode material to assemble lithium-ion batteries using the preparation method of Application Example 1. Battery, after electrochemical test, the first discharge specific capacity of the lithium-ion battery made by it is 2877.5mAh·g -1 , the Coulombic efficiency is 76%, and after 400 cycles, the reversible cycle specific capacity of the battery is 1204.5mAh g -1 , the Coulombic efficiency was mai...

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Abstract

The invention discloses a silicon-based Si-C negative electrode material prepared based on calcium carbonate and a preparation method and application thereof, and belongs to the field of battery negative electrode material preparation. The method comprises the steps: taking a silicon-calcium alloy and calcium carbonate as raw materials; preparing the silicon-based Si-C negative electrode materialthrough the reaction in calcium chloride-based or calcium chloride-magnesium chloride-based molten salt, and taking the prepared silicon-based Si-C negative electrode material as the battery negativeelectrode so as to provide good specific capacity and good cycle performance. According to the method, the distribution of silicon and carbon can be regulated and controlled through the components ofthe salt, the synthesis temperature, the synthesis time and the stirring rotating speed, and the product morphology and the particle size are regulated and controlled. The method achieves the low-costpreparation, regulation and preparation of the silicon-based Si-C negative electrode material, and the operation process is simple.

Description

technical field [0001] The invention relates to the field of battery negative electrode material preparation, in particular to a silicon-based Si-C negative electrode material prepared based on calcium carbonate, a preparation method and application thereof. Background technique [0002] With the increasing use of portable electronic devices and electric vehicles, the development of lithium-ion batteries with high energy density has become an urgent need. Graphite is the current commercial lithium-ion battery anode material, and its theoretical capacity is 372mAh / g, which cannot meet the high-capacity demand of the next-generation lithium-ion battery. Therefore, it is urgent to develop a high-capacity, high-power-density anode material to replace graphite. As the anode material of lithium-ion batteries, silicon has attracted much attention because of its theoretical capacity as high as 4200mAh / g, abundant reserves, low price, and low intercalation / delithiation potential. H...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/362H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 谢宏伟徐亚男王锦霞尹华意宋秋实宁志强
Owner NORTHEASTERN UNIV