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A silicon-based Si-b negative electrode material and its electrochemical synthesis method and application

A technology of negative electrode material and synthesis method, which is applied in the field of silicon-based Si-B negative electrode material and its electrochemical synthesis, and can solve the problems of complex operation, high cost, uneven distribution of Si and B, etc.

Active Publication Date: 2020-11-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium is a strong reducing agent, and the reduction is an exothermic reaction. During the reaction, a large amount of heat is released, which will cause the oxide raw materials to sinter into large particles, which is not conducive to the effective progress of the reaction, and is not conducive to the control of production, and the consumption of active and expensive metal magnesium Big
This method has problems such as high cost, complicated operation, uneven distribution of Si and B, and large particle size of silicon products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] An electrochemical synthesis method of silicon-based Si-B negative electrode material, carried out according to the following steps;

[0071] Step 1: Preparation

[0072] The CaCl used in this embodiment 2 -In the CaO-based molten salt, the molar percentage of CaO is 0.23.

[0073] (1) Take boron oxide, calcium oxide, calcium chloride, metallurgical silicon, graphite rods or inert anode materials and dry them separately to remove water. Weigh boron oxide 7.0g±0.1g (0.1mol / 6.962g), calcium oxide 16.8g±0.1g (0.3mol / 16.8231g), calcium chloride 111.0g±0.1g (1mol / 111.0g). Grind the treated salt and boron oxide, mix evenly, pour into the embedded graphite crucible of the reactor, and seal it. Iron-chromium-aluminum wires are respectively connected with metallurgical silicon and graphite rods to form cathode and anode, and pass through the reactor cover.

[0074] (2) The reactor is placed in a resistance wire furnace, the inert gas is introduced from the inlet of the react...

Embodiment 2

[0088] The CaCl used in this embodiment 2 -In the CaO-based molten salt, the molar percentage of CaO is 0.2;

[0089] A kind of electrochemical synthesis method of silicon-based Si-B negative electrode material, with embodiment 1, difference is:

[0090] (1) In step 1(1), the weighed calcium chloride quality is 133.2g ± 0.1g;

[0091] (2) In step 2(1), the synthesis temperature is 870°C;

[0092] The other methods are the same, and the silicon-based Si-B negative electrode material with a particle diameter of 0.5-5 microns is prepared.

Embodiment 3

[0094] The CaCl used in this embodiment 2 -In the CaO-based molten salt, the molar percentage of CaO is 0.13;

[0095] A kind of electrochemical synthesis method of silicon-based Si-B negative electrode material, with embodiment 1, difference is:

[0096] (1) In step 1(1), the weighed calcium chloride quality is 222.0g ± 0.1g;

[0097] (2) In step 2(1), the synthesis temperature is 850°C;

[0098] The other methods are the same, and the silicon-based Si-B negative electrode material with a particle diameter of 0.5-5 microns is prepared.

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Abstract

A silicon-based Si-B negative electrode material and its electrochemical synthesis method and application belong to the field of battery negative electrode material preparation. The electrochemical synthesis method of the silicon-based Si-B negative electrode material is to use silicon raw materials and boron-containing oxides as raw materials, in CaCl 2 -In CaO-based salts, static silicon raw material or dynamic rotating silicon raw material is used as the cathode, graphite rod or inert material is used as the anode, and an application temperature higher than CaCl 2 ‑CaO-based molten salt decomposes less calcium than CaCl 2 ‑CaCl in CaO-based molten salt 2 The decomposition voltage is energized for electrolysis, and the silicon-based Si-B negative electrode material is obtained. By regulating the preparation process, the uniform distribution of silicon and boron in the Si-B product can be promoted and the particle size can be controlled, which is conducive to effective buffering. It serves as the volume expansion of the silicon-lithium alloying process in the negative electrode material of lithium ion batteries and improves the conductivity of the silicon material. rate and improve electrochemical performance. This method has low cost and simple operation process.

Description

technical field [0001] The invention relates to the field of battery negative electrode material preparation, in particular to a silicon-based Si-B negative electrode material and an electrochemical synthesis 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. However, the volume...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525C25B1/00C25B15/02
CPCC25B1/00C25B15/02C25B1/33H01M4/362H01M4/386H01M10/0525Y02E60/10
Inventor 谢宏伟徐亚男林家平王锦霞尹华意宋秋实宁志强
Owner NORTHEASTERN UNIV LIAONING