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Sheet-shaped boron-doped porous silicon electrode material and preparation method thereof

An electrode material, boron doping technology, applied in battery electrodes, silicon, circuits, etc., can solve the problems of electrical conductivity and low initial efficiency of silicon carbon negative electrode, and achieve the effect of reducing oxide layer, improving initial efficiency, and facilitating wetting

Active Publication Date: 2018-08-10
中国平煤神马控股集团有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two key problems to be solved in the practical application of silicon anode materials: first, the conductivity problem
Although carbon coating can effectively improve electrical conductivity, higher carbon content often leads to lower initial efficiency of silicon carbon anodes.

Method used

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  • Sheet-shaped boron-doped porous silicon electrode material and preparation method thereof
  • Sheet-shaped boron-doped porous silicon electrode material and preparation method thereof
  • Sheet-shaped boron-doped porous silicon electrode material and preparation method thereof

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Effect test

Embodiment 1

[0048] A flaky boron-doped porous silicon electrode material with a particle size of 0.2-5 μm, assembled from silicon nanoparticles with a particle size of 10-20 nm; the specific surface area of ​​the flaky boron-doped porous silicon electrode material 38m 2 / g, the pore diameter is 20-70nm; the molar percentage of boron in the sheet-like boron-doped porous silicon electrode material is 5%.

[0049] The preparation method of the above-mentioned flaky boron-doped porous silicon electrode material is:

[0050] (1) Soak the boron-doped P-type silicon chips in 1M hydrochloric acid for 6 hours to remove metal impurities and their oxides in the boron-doped P-type silicon chips, then filter them with suction, wash them with water, and dry them in vacuum at 70°C treatment to obtain boron-doped silicon powder; wherein, the particle diameter of the boron-doped P-type silicon debris is 0.2-5 μm; the molar percentage of boron in the boron-doped P-type silicon debris (mol percent ) is 5%...

Embodiment 2

[0059] Prepare undoped porous silicon electrode material with undoped commercial silicon powder as raw material, the preparation method of described porous silicon electrode material is:

[0060] (1) Soak undoped commercial silicon powder with 1M hydrochloric acid for 6 hours, then filter, wash with water, and dry in vacuum at 70°C to obtain silicon powder; wherein, the particle size of the undoped commercial silicon powder is 0.2-5μm;

[0061] (2) Mix silicon powder and magnesium powder evenly at a molar ratio of 1:2.1 to obtain a mixture, which is heat-treated under an argon atmosphere to generate Mg 2 Si powder; the heat treatment temperature is 550°C, and the heat treatment time is 5h;

[0062] (3) Mg 2 Si powder was subjected to high-temperature oxidation at 600°C for 5 hours to obtain a reaction product. The reaction product was soaked in mineral acid for 6 hours, filtered with suction, washed with water, soaked and cleaned with 20% HF acid solution for 6 hours, and th...

Embodiment 3

[0065] A flaky boron-doped porous silicon electrode material with a particle size of 0.2-5 μm, assembled from silicon nanoparticles with a particle size of 10-20 nm; the specific surface area of ​​the flaky boron-doped porous silicon electrode material 65m 2 / g, the pore diameter is 20-70nm; the molar percentage of boron in the sheet-like boron-doped porous silicon electrode material is 0.5%.

[0066] The preparation method of the above-mentioned flaky boron-doped porous silicon electrode material is:

[0067] (1) Soak the boron-doped P-type silicon chips in 0.1M hydrochloric acid for 24 hours to remove metal impurities and their oxides in the boron-doped P-type silicon chips, and then filter, wash with water, and vacuum at 70°C Drying treatment to obtain boron-doped silicon powder; wherein, the particle diameter of the boron-doped P-type silicon debris is 0.2-5 μm; the molar percentage of boron in the boron-doped P-type silicon debris (mol percentage) is 0.5%;

[0068] (2)...

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Abstract

The invention discloses a preparation method of a sheet-shaped boron-doped porous silicon electrode material. The preparation method comprises the steps of (1) immersing boron-doped P-type silicon debris with an inorganic acid for 6-24 hours, and performing washing and drying to obtain boron-doped silicon powder; (2) uniformly mixing the boron-doped silicon powder and magnesium powder according toa mole ratio being 1:(1-2.5) to obtain a mixed material, and performing thermal processing on the mixed material under inert atmosphere to generate Mg2Si powder; (3) oxidizing the Mg2Si powder undera high temperature of 400-850 DEG C to obtain a reaction product, immersing the reaction product with the inorganic acid, cleaning and washing the reaction product with an HF solution, and obtaining the sheet-shaped boron-doped porous silicon electrode material after drying. The grain size of the prepared sheet-shaped boron-doped porous silicon electrode material is 0.2-5 micrometers, the specificarea is (10-100) m<2> / g, and the pore diameter is 20-70 nanometers. The sheet-shaped boron-doped porous silicon electrode material has favorable cycle stability and high specific capacity.

Description

technical field [0001] The invention belongs to the field of new energy material research, in particular to a sheet-shaped boron-doped porous silicon electrode material and a preparation method thereof. Background technique [0002] In recent decades, lithium-ion batteries have been widely used in smart digital products. Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, large specific capacity, long cycle life, and environmental friendliness. So far, lithium-ion battery anode materials mainly include carbon materials, lithium alloys (Si, Ge, Sn, Sb), transition metal oxides (Fe 2 o 3 , SnO 2 , MnO 2 , CoO 2 ,TiO 2 ), transition metal nitrides. However, the theoretical discharge specific capacity of the commercialized graphite anode material is only 372mAh / g, which is difficult to meet the ever-increasing demand for power lithium-ion batteries in electric ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525C01B33/02
CPCC01B33/02H01M4/386H01M10/0525Y02E60/10
Inventor 窦晓勇宰建陶钱雪峰海国栋戚嵘嵘杨鹏陈明喻宏兴陈茜茹李波刘雪娇付雷雨白荣光
Owner 中国平煤神马控股集团有限公司
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