Preparation method of anode material compounding three-dimensional porous silicon doped titanium source with carbon

A three-dimensional porous, negative electrode material technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem that the volume expansion effect of silicon cannot be effectively eliminated, and achieve improved cycle stability, high specific capacity, and stable discharge voltage Effect

Active Publication Date: 2018-08-07
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Si / C anode materials prepared by physical methods cannot effectively eliminate the volume expansion effect of silicon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix aluminum powder: silicon dioxide uniformly according to the mass ratio of 4:1, put it into a high-temperature carbonization furnace, pass through a protective atmosphere (argon / nitrogen), heat at 600°C for 5 hours, and immerse the obtained sample in hydrogen first Fluoric acid solution (50wt%) for 12 hours, then washed with ethanol and distilled water for 4 times, and finally vacuum-dried at 80°C for 12 hours to obtain porous silicon; Add porous silicon and absolute ethanol, then add butyl titanate and grind for 2 hours to obtain a nano-slurry; ③The obtained nano-mixed slurry is spray-dried at an inlet temperature of 250°C and an outlet temperature of 90°C to obtain a precursor; ④The obtained precursor is baked at 500°C for 2 hours in a nitrogen protective atmosphere, and then cooled to room temperature; ⑤Through the dried material through a 250-mesh sieve, use the organic gas acetylene containing hydrocarbons as the carbon source, and nitrogen as the protective atmo...

Embodiment 2

[0027] Mix aluminum powder: silicon dioxide evenly according to the mass ratio of 1:1, then put it into a high-temperature carbonization furnace, pass through a protective atmosphere (argon / nitrogen), heat at 700°C for 7 hours, and first immerse the obtained sample in hydrogen Fluoric acid solution (50wt%) for 12 hours, then washed with ethanol and distilled water for 4 times, and finally vacuum-dried at 80°C for 12 hours to obtain porous silicon; ② Pass porous silicon through a 250-mesh sieve and add Porous silicon and absolute ethanol were added to grind for 5 hours to obtain a nano-slurry; ③The obtained nano-mixed slurry was spray-dried at an inlet temperature of 250°C and an outlet temperature of 90°C to obtain a precursor; ④Obtained The precursor of the precursor is under a nitrogen protective atmosphere, the calcination temperature is 650 ° C, the time is 4.5 hours, and cooled to room temperature; ⑤ Pass the dried material through a 250-mesh sieve, use the organic gas ace...

Embodiment 3

[0029] Aluminum powder: silicon dioxide is mixed evenly according to the mass ratio of 2:1, put into a high-temperature carbonization furnace, pass through a protective atmosphere (argon / nitrogen), heat at 700°C for 7 hours, and first immerse the obtained sample in hydrogen fluoride acid solution (50wt%) for 12 hours, then washed with ethanol and distilled water for 4 times, and finally vacuum-dried at 80°C for 12 hours to obtain porous silicon; Silicon and absolute ethanol, and then added butyl titanate to grind for 6 hours to obtain a nano-slurry; ③The obtained nano-mixed slurry was spray-dried at an inlet temperature of 350°C and an outlet temperature of 90°C to obtain a precursor; ④The obtained Precursors were baked at 900°C for 7 hours in a nitrogen protective atmosphere, and cooled to room temperature; ⑤ Pass the dried material through a 250-mesh sieve, use the organic gas acetylene containing hydrocarbons as the carbon source, and nitrogen as the protective atmosphere, a...

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PUM

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Abstract

The invention relates to a preparation method of an anode material compounding three-dimensional porous silicon doped titanium source with carbon. The preparation method comprises the following steps:preparing porous silicon, adding deionized water or absolute ethyl alcohol and a titanium source, and grinding, so that nano slurry is obtained; carrying out spray drying with nano mixed slurry, so that a precursor is obtained; roasting the precursor, cooling, sieving, carrying out deposition coating through CVD, and then cooling in an inert gas atmosphere, so that a three-dimensional porous silicon composite is obtained. The preparation method provided by the invention solves the problems of the conventional Si / C cycle performance and expansion.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a method for preparing negative electrode materials by compounding a three-dimensional porous silicon-doped titanium source and carbon. Background technique [0002] Lithium-ion batteries are favored for their excellent properties such as high capacity, high voltage, high cycle stability, high energy density and no pollution to the environment. As a negative electrode material, silicon has the advantage of high specific capacity (4200mAh / g), but its significant disadvantage is that the volume expands after lithium ions are intercalated (up to 300%), and the mechanical force generated will gradually pulverize the material and cause the structure to collapse. Ultimately, the cycle performance of the battery is greatly reduced. The porous silicon structure can provide enough internal free space to absorb the large volume expansion, thus enhancin...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 唐唯皮涛王志勇黄越华肖志平邵浩明黎建锋
Owner HUNAN SHINZOOM TECH
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