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Method for detecting contents of SiO2 and Si in silicon-carbon composite material for lithium ion battery

A technology of silicon-carbon composite materials and lithium-ion batteries, which is applied in the direction of analyzing materials, analyzing materials through optical means, and analyzing materials through chemical reactions. It can solve the problems of harsh detection conditions and complicated processes, and achieve simple operation. , high sensitivity and wide linear range

Inactive Publication Date: 2017-06-27
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on existing technology, it is difficult to simultaneously detect SiO in samples 2 , Si content, and the technical problems of relatively harsh detection conditions and complicated process, the purpose of the present invention is to provide a SiO 2 , Si content detection method, accurately detect SiO in silicon-carbon composite materials under mild conditions 2 , Si content, to meet the needs of lithium-ion battery material analysis and testing

Method used

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  • Method for detecting contents of SiO2 and Si in silicon-carbon composite material for lithium ion battery
  • Method for detecting contents of SiO2 and Si in silicon-carbon composite material for lithium ion battery
  • Method for detecting contents of SiO2 and Si in silicon-carbon composite material for lithium ion battery

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Embodiment 1

[0054] SiO in standard 2 , Si content detection

[0055] The standard product uses high-purity SiO 2 , high-purity silicon powder, and high-purity graphite powder for preparation. If a mixed standard substance is prepared, test abnormalities may occur due to uneven mixing of the three substances. Therefore, in the test of this embodiment, each sample is independently and accurately weighed three substances, and the mass error is controlled within ±0.0010g.

[0056] (1) SiO in the standard product 2 Content detection

[0057] Accurately weigh high-purity SiO 2 Reagent 0.0200±0.0010g, high-purity silicon powder 0.0200±0.0010g, high-purity graphite powder 0.0600±0.0010g, put in a polytetrafluoroethylene plastic container, add 5mL 10wt% hydrochloric acid solution, 5mL 15wt% hydrofluoric acid solution, quickly tighten the plastic container, place it in a 50°C water bath and heat it for 10 minutes, take it out, cool it with running water, shake it well, and dilute it in a 250...

Embodiment 2

[0066] SiO in actual samples 2 , Si content detection

[0067] (1) SiO in the sample 2 Content detection

[0068] Accurately weigh 0.1000±0.0020g of the vacuum-dried sample, place it in a polytetrafluoroethylene plastic container, add 5mL of 10wt% hydrochloric acid solution and 5mL of 15wt% hydrofluoric acid solution in sequence, quickly tighten the plastic container, and place Heat it in a water bath at 50°C for 10 minutes, take it out and cool it with running water quickly, shake it well, and dilute it in a 250mL volumetric flask with pure water. Then take 2mL of the above clear solution and place it in a 250mL plastic volumetric flask, add 20mL NH 4 Cl-HCl buffer solution and 5mL of 2wt% ammonium molybdate were added, followed by adding 2mL of 2% ascorbic acid, and distilled to volume with pure water. After standing still until the silicon molybdenum yellow in the solution turns into silicon molybdenum blue, take an appropriate amount of stable color liquid and pour i...

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Abstract

The invention discloses a method for detecting contents of SiO2 and Si in a silicon-carbon composite material for a lithium ion battery. The method comprises the following steps: (1) weighing samples a and b which are subjected to vacuum drying, respectively putting the samples a and b into a plastic container, dissolving out SiO2 from the sample a by virtue of hydrochloric acid and hydrofluoric acid, dissolving out Si and SiO2 from the sample b by virtue of nitric acid and hydrofluoric acid, cooling, carrying out volume fixation, filtering, weighing filtered clear liquid, sequentially adding a pH buffer solution, ammonium molybdate and a reducing agent, and carrying out volume fixation, so as to obtain a processed to-be-tested solution; (2) testing the solution at a 810nm site through a spectrophotometer by taking deionized water as a reference solution; (3) measuring absorbancy of standard SiO2 solution with different concentrations by virtue of the steps, and drawing a standard curve; and (4) respectively calculating the contents of SiO2 and Si in the silicon-carbon composite material according to the standard curve and a calculation formula. By utilizing the method, the contents of SiO2 and Si in the silicon-carbon composite material can be accurately detected under mild conditions, so as to meet analytical test requirements of the lithium ion battery.

Description

technical field [0001] The invention relates to SiO in a silicon-carbon composite material for a lithium-ion battery 2 , Si content detection method, belong to lithium ion battery analysis and testing technology field. Background technique [0002] As a typical representative of secondary energy, lithium-ion batteries have the characteristics of good cycle performance, high capacity, and high voltage, and are widely used in many industries. In recent years, as the negative electrode material of lithium-ion batteries, silicon-carbon composite materials have the characteristics of high specific capacity and have been extensively studied by scientists in the industry. At present, this material is in the critical stage of transformation from laboratory to commercialization. SiO 2 , Si content is an important index to determine the capacity of composite materials, but there is no definite standard method for accurate detection of their content, and no simultaneous accurate detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/3577
CPCG01N21/78G01N21/3577
Inventor 余章龙于冰马小利李晓萍史碧梦王宁赵春荣
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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