CN113092458A - Method for detecting residual alkali content on surface of cathode material of sodium ion battery - Google Patents
Method for detecting residual alkali content on surface of cathode material of sodium ion battery Download PDFInfo
- Publication number
- CN113092458A CN113092458A CN202110377510.0A CN202110377510A CN113092458A CN 113092458 A CN113092458 A CN 113092458A CN 202110377510 A CN202110377510 A CN 202110377510A CN 113092458 A CN113092458 A CN 113092458A
- Authority
- CN
- China
- Prior art keywords
- solution
- sodium carbonate
- concentration
- standard
- ion battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention provides a method for detecting the residual alkali content on the surface of a cathode material of a sodium ion battery, belonging to the technical field of detection of the cathode material of the sodium ion battery. The method for detecting the residual alkali content on the surface of the cathode material of the sodium-ion battery comprises the following steps: respectively preparing a calibration indicator, a standard acidic solution and a titration indicator; calibrating the standard acidic solution by using a working reference reagent, and calculating the concentration of the calibrated standard acidic solution; the residual alkali content was measured. The content of residual alkali can be obtained by substituting the measured volume of the consumed standard acidic solution into a calculation formula. The detection method provided by the invention is simple to operate and high in accuracy.
Description
Technical Field
The invention relates to the technical field of detection of cathode materials of sodium ion batteries, in particular to a method for detecting the content of residual alkali on the surface of the cathode materials of the sodium ion batteries.
Background
In the production process of the sodium ion battery material, the loss of sodium element is considered, excessive sodium salt is often added in the production process of the material, so that the sodium salt residue is caused after the material is sintered, and the sodium salt residue mainly exists in the form of sodium carbonate and sodium hydroxide, which are called residual alkali for short. If the alkalinity of the cathode material of the sodium ion battery is too high, the material is easy to absorb water and damp in the processing process, the viscosity is increased in the slurry stirring process, jelly is easy to form, and the processing performance is poor; in addition, the decomposition of sodium carbonate under high voltage is one of the causes of battery flatulence, thereby bringing about potential safety hazards; the surface basic compound also causes irreversible capacity loss and deteriorates cycle performance, so that it is necessary to control the content of residual alkali such as sodium carbonate in the material. The detection of the residual alkali is a basic work and is indispensable. In practical application, the test is generally carried out by adopting an acid-base chemical titration method, and the tested substances mainly comprise sodium carbonate and sodium hydroxide.
Due to the poor stability of the sodium ion battery cathode material in water, the desired results will not be fully obtained by testing using conventional methods.
Disclosure of Invention
The invention aims to provide a method for detecting the content of residual alkali on the surface of a cathode material of a sodium ion battery, and improve the accuracy of detecting the residual alkali on the surface of the cathode material of the sodium ion battery.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for detecting the residual alkali content on the surface of a cathode material of a sodium-ion battery, which comprises the following steps:
respectively preparing a calibration indicator, a standard acidic solution and a titration indicator;
calibrating the standard acidic solution by using a working reference reagent and a calibration indicator, and then calculating the concentration of the calibrated standard acidic solution;
the residual alkali content was measured.
Further, the calibration indicator is prepared by mixing the following components in a volume ratio of 2-4: 1-2 parts of bromocresol green ethanol solution and methyl red ethanol solution.
Further, the concentration of the bromocresol green ethanol solution is 1-2 g/L, and the concentration of the methyl red ethanol solution is 2-3 g/L.
Further, the standard acidic solution is a standard solution of hydrochloric acid, and the standard solution of hydrochloric acid is obtained by diluting 8-10 mL of analytically pure hydrochloric acid to 1000 mL.
Further, the working standard reagent is an anhydrous sodium carbonate solution.
Further, the step of calibrating the standard acidic solution comprises: adding 9-11 drops of calibration indicator into the anhydrous sodium carbonate solution, titrating the anhydrous sodium carbonate solution with a standard acid solution to change the anhydrous sodium carbonate solution from green to dark red, continuously titrating to dark red after boiling, and paralleling for three times.
Furthermore, the concentration of the anhydrous sodium carbonate solution is 0.035-0.040 mol/L, and the volume of the anhydrous sodium carbonate solution is 46-55 mL.
Further, the titration indicator is prepared by mixing a titration indicator and a titration indicator, wherein the titration indicator is prepared from a mixture of a titration indicator and a titration indicator in a volume ratio of 3-5: 4-6: 1-2 of cresol red ethanol solution, methyl red ethanol solution and methylene blue aqueous solution.
Furthermore, the concentration of the cresol red ethanol solution is 1-2 g/L, the concentration of the methyl red ethanol solution is 2-3 g/L, and the concentration of the methylene blue aqueous solution is 1-2 g/L.
Further, the residual alkali is sodium hydroxide and/or sodium carbonate.
Further, the method for measuring the content of the sodium hydroxide comprises the following steps: taking a liquid to be detected, adding 7-10 drops of a titration indicator to obtain blue, titrating the liquid to be detected to be bright green by using a calibrated standard acid solution, and recording the volume V of the calibrated standard acid solution consumed by a color-changing point1。
Further, the sodium hydroxide content is measured according to the following formula: wNaOH％＝V1×C×M1×100/(m1×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M1Is the molar mass of sodium hydroxide, m1The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
Further, of sodium carbonate contentThe measuring method comprises the following steps: taking the liquid to be detected, adding 7-10 drops of titration indicator to obtain blue liquid, titrating the blue liquid by using the calibrated standard acid solution until the volume consumed by green record is V2Continue titration to dark red recording consumption volume of V3。
Further, the measurement formula of the sodium carbonate content is as follows: wNa2CO3％＝(V3-V2)×C×M2×100/(m2×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M2Is the molar mass m of sodium carbonate2The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
The invention has the beneficial effects that:
the detection method can accurately detect the content of residual alkali on the surface of the cathode material of the sodium-ion battery through experiments, and has the advantages of simple operation and convenient use.
Drawings
FIG. 1 is a flowchart of a method for detecting the residual alkali content on the surface of a cathode material of a sodium-ion battery according to embodiment 1 of the invention;
FIG. 2 is a graph showing the relationship between the amount of hydrochloric acid consumed in the detection of the residual alkali content on the surface of the cathode material of the sodium ion battery by the acid-base titration method and the electrode voltage in the prior art.
Detailed Description
The invention provides a method for detecting the residual alkali content on the surface of a cathode material of a sodium-ion battery, which comprises the following steps:
respectively preparing a calibration indicator, a standard acidic solution and a titration indicator;
calibrating the standard acidic solution by using a working reference reagent and a calibration indicator, and then calculating the concentration of the calibrated standard acidic solution;
the residual alkali content was measured.
In the invention, the calibration indicator is prepared by mixing the following components in a volume ratio of 2-4: 1-2, and the volume ratio is preferably 3: 1.
in the invention, the preparation method of the bromocresol green ethanol solution comprises the following steps: weighing 0.10-0.20 g of bromocresol green, dissolving in a 95% ethanol solution, and diluting to 100mL by using the 95% ethanol solution to obtain the bromocresol green.
In the invention, the concentration of the bromocresol green ethanol solution is 1-2 g/L, and preferably 1.5 g/L.
In the invention, the preparation method of the methyl red ethanol solution comprises the following steps: weighing 0.20-0.30 g of methyl red, dissolving in a 95% ethanol solution, and diluting to 100mL with the 95% ethanol solution.
In the invention, the concentration of the methyl red ethanol solution is 2-3 g/L, preferably 2.5 g/L.
In the present invention, H of the standard acidic solution+The molar concentration of the compound is 0.020-0.20 mol/L, preferably 0.050-0.180 mol/L; the standard acidic solution is a standard solution of hydrochloric acid, the standard solution of hydrochloric acid is obtained by diluting 8-10 mL of analytically pure hydrochloric acid to 1000mL, and preferably 9mL of analytically pure hydrochloric acid is diluted to 1000mL with water.
In the invention, the working standard reagent is an anhydrous sodium carbonate solution, and the content of the anhydrous sodium carbonate is 99.95-100.05%.
In the present invention, the steps of calibrating the standard acidic solution are: adding 9-11 drops of calibration indicator into the anhydrous sodium carbonate solution, titrating the anhydrous sodium carbonate solution by using a standard acidic solution to change the anhydrous sodium carbonate solution from green to dark red, continuously titrating to dark red after boiling, and performing parallel three times, wherein the added calibration indicator is preferably 10 drops.
In the invention, the concentration of the anhydrous sodium carbonate solution is 0.035-0.040 mol/L, preferably 0.038 mol/L; the volume of the anhydrous sodium carbonate solution is 46-55 mL, and preferably 50 mL.
In the invention, the titration indicator is prepared by mixing the following components in a volume ratio of 3-5: 4-6: 1-2, wherein the volume ratio is preferably 4: 5: 1.
in the invention, the preparation method of the cresol red ethanol solution comprises the following steps: weighing 0.10-0.20 g of cresol red, dissolving in a 95% ethanol solution, and diluting to 100mL by using the 95% ethanol solution to obtain the cresol red.
In the invention, the concentration of the cresol red ethanol solution is 1-2 g/L, and preferably 1.5 g/L.
In the invention, the preparation method of the methyl red ethanol solution comprises the following steps: weighing 0.20-0.30 g of methyl red, dissolving in a 95% ethanol solution, and diluting to 100mL with the 95% ethanol solution.
In the invention, the concentration of the methyl red ethanol solution is 2-3 g/L, preferably 2.5 g/L.
In the invention, the concentration of the methylene blue aqueous solution is 1-2 g/L, preferably 1.5 g/L.
In the present invention, the residual alkali is preferably sodium hydroxide and/or sodium carbonate.
In the invention, the method for measuring the content of the sodium hydroxide comprises the following steps: taking a liquid to be detected, adding 7-10 drops of a titration indicator to obtain blue, titrating the liquid to be detected to be bright green by using a calibrated standard acid solution, and recording the volume V of the calibrated standard acid solution consumed by a color-changing point1。
In the present invention, the liquid to be tested is a supernatant obtained by mixing 10.00g of a sample in 90.00g of pure water or absolute ethanol, and performing centrifugal separation, wherein the pure water is preferably one of distilled water, RO water and UP water.
In the invention, the amount of the liquid to be detected is 10-20 g, preferably 15 g.
In the present invention, the sodium hydroxide content is measured by the following formula: wNaOH％＝V1×C×M1×100/(m1×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M1Is the molar mass of sodium hydroxide, m1The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
In the invention, the method for measuring the content of sodium carbonate comprises the following steps: taking the liquid to be detected, adding 7-10 drops of titration indicator to obtain blue liquid, titrating the blue liquid by using the calibrated standard acid solution until the volume consumed by green record is V2Continue titration to dark red recording consumption volume of V3。
In the present inventionThe measurement formula of the sodium carbonate content is as follows: wNa2CO3％＝(V3-V2)×C×M2×100/(m2×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M2Is the molar mass m of sodium carbonate2The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
In the invention, the calculation formula of the molar concentration C of the calibrated standard acidic solution is as follows: c ═ M × 1000/(V × M);
wherein M is the mass of anhydrous sodium carbonate, V is the volume of the standard acidic solution consumed, and M is the molar mass of anhydrous sodium carbonate.
The consistency of the units is required to be adjusted in the application process of the formula, wherein the unit of W is percent, and V is1、V2And V3In units of mL, the concentration of C in units of mol/L, M1、M2In units of g/mol, m1、m2The unit of (c) is g.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Detecting the content of residual alkali-sodium hydroxide on the surface of the cathode material of the sodium ion battery:
s1: putting 10.00g of sample into a 250mL beaker, adding 90.00g of absolute ethanol solvent, adding polytetrafluoroethylene magnetons with the model B528, and stirring at room temperature for 10min at the rotating speed of 500 r/min; pouring the solution into a 50mL centrifuge tube, centrifuging at a high speed of 8000r/min for 5min, and taking the supernatant to obtain a solution to be detected for later use.
S2: preparation of standard acidic solution: 9mL of analytically pure hydrochloric acid is measured by a measuring cylinder, and the analytically pure hydrochloric acid is added into a volumetric flask with the volume being 1000mL by water and shaken up.
S3: preparing a calibration indicator: 1g/L bromocresol green ethanol solution (95%) and 2g/L methyl red ethanol solution (95%) as 3: 1 volume ratio, and shaking up.
S4: calibration of standard acidic solution: weighing 0.2g of anhydrous sodium carbonate which is burned to constant weight at 280 ℃, dissolving the anhydrous sodium carbonate in 50mL of pure water, adding 10 drops of a calibration indicator, titrating by using a prepared hydrochloric acid standard solution, changing the anhydrous sodium carbonate solution from green to dark red, boiling for 2min, cooling, and then continuously titrating until the solution is dark red again, wherein the three times are carried out in parallel;
s4.1: calculating the concentration of the calibrated standard acidic solution: where M is the mass of anhydrous sodium carbonate, V is the volume of the standard acidic solution consumed and M is the molar mass of anhydrous sodium carbonate.
S5: preparation of titration indicator: 1g/L cresol red ethanol solution (95%), 1g/L methyl red ethanol solution (95%) and 2g/L methylene blue aqueous solution in a ratio of 4: 5: 1 volume ratio, and shaking up.
S6 calculating the content of sodium hydroxide: taking 10g of the liquid to be detected, adding 9 drops of titration indicator to obtain blue, titrating to bright green by using the calibrated standard acid solution, and recording the volume V of the calibrated standard acid solution consumed by the color change point1Substituting into a calculation formula:
WNaOH％＝V1×C×M1×100/(m1x 1000), wherein C is the molar concentration of the calibrated standard acidic solution, and M1Is the molar mass of sodium hydroxide, m1The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
The leaching treatment of the cathode material of the sodium-ion battery can also influence the final result to a certain extent, and in the practical process, the total alkali content is found to be in an increasing trend along with the lengthening of the stirring time, and the residual alkali content is measured under different stirring times in the table below.
The measurement results were as follows:
from the above results, it can be seen that the stirring time is from 5min to 10min to 20min, and R is increased with the increase of the stirring time1The (NaOH) content gradually increased, but the change was not particularly significant, indicating that all of the alkali remaining on the surface of the material had been removedDissolving in a solvent; and comprehensively considering the detection efficiency and ensuring complete dissolution of the alkaline substances on the surface of the material, and finally selecting the peak value of the measurement result as the final detection value.
Example 2
Detecting the content of residual alkali-sodium carbonate on the surface of the cathode material of the sodium ion battery:
s1: putting 10.00g of sample into a 250mL beaker, adding 90.00g of distilled water, adding polytetrafluoroethylene magnetons with the model B528, and stirring at room temperature for 10min at the rotating speed of 500 r/min; pouring the solution into a 50mL centrifuge tube, centrifuging at a high speed of 8000r/min for 5min, and taking the supernatant to obtain a solution to be detected for later use.
The steps S2-S5 are the same as the corresponding steps in example 1.
S6: calculating the content of sodium carbonate: taking 10g of the liquid to be detected, adding 10 drops of titration indicator to obtain blue, titrating with a calibrated standard acid solution until the volume consumed by green record is V2Continue titration to dark red recording consumption volume of V3。
Substituting into a calculation formula: wNa2CO3％＝(V3-V2)×C×M2×100/(m2×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M2Is the molar mass m of sodium carbonate2The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
The measurement results were as follows:
as can be seen from the above table, the stirring time is from 1min to 3min to 5min to 10min to 20min, and R is increased with the extension of the stirring time2(Na2CO3) The increase was gradual, but the change was not particularly significant after 5min, indicating that the residual alkali on the surface of the material had been completely dissolved in the solvent. And comprehensively considering the detection efficiency and ensuring complete dissolution of the alkaline substances on the surface of the material, and finally selecting the peak value of the measurement result as the final detection value.
Comparative example 1
The method comprises the steps of measuring the residual alkali content on the surface of the cathode material of the sodium-ion battery by using the existing detection method of the residual alkali content on the surface of the cathode material of the lithium battery, wherein when water is used as a solvent, sodium in material lattices can exchange with hydrogen ions in the water to generate sodium hydroxide, and acid-base titration is carried out by using hydrochloric acid, so that a large amount of hydrochloric acid is consumed in an experiment and still does not reach an equivalence point, the calculated value at the moment is over 20%, as shown in figure 2, the result is seriously distorted, and the residual alkali content on the surface of the cathode material of the sodium-ion battery cannot be obtained by using the lithium battery method.
Verification example
A mixed solution with known concentration is prepared by using a sodium hydroxide standard solution and a sodium carbonate working reference reagent, and the content of sodium hydroxide and sodium carbonate in the solution is detected according to the methods of example 1 and example 2. The calculation results are shown in the following table:
from the above data, it can be seen that the measured sodium hydroxide and sodium carbonate contents are close to the theoretical values, and the results are within the allowable error range. Therefore, the detection method has high measurement accuracy.
According to the embodiment, the detection method for accurately calculating the residual alkali content on the surface of the cathode material of the sodium-ion battery is provided, the residual alkali content on the surface of the cathode material of the sodium-ion battery can be accurately detected through the detection method, and the method is simple to operate and convenient to use.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The method for detecting the residual alkali content on the surface of the cathode material of the sodium-ion battery is characterized by comprising the following steps of:
respectively preparing a calibration indicator, a standard acidic solution and a titration indicator;
calibrating the standard acidic solution by using a working reference reagent and a calibration indicator, and then calculating the concentration of the calibrated standard acidic solution;
the residual alkali content was measured.
2. The detection method according to claim 1, wherein the calibration indicator is prepared by mixing the following components in a volume ratio of 2-4: 1-2, preparing a bromocresol green ethanol solution and a methyl red ethanol solution;
the concentration of the bromocresol green ethanol solution is 1-2 g/L, and the concentration of the methyl red ethanol solution is 2-3 g/L.
3. The detection method according to claim 2, wherein the standard acidic solution is a hydrochloric acid standard solution, and the hydrochloric acid standard solution is obtained by diluting 8-10 mL of analytically pure hydrochloric acid to 1000 mL; the working reference reagent is an anhydrous sodium carbonate solution.
4. The test method according to claim 3, wherein the step of calibrating the standard acidic solution comprises: adding 9-11 drops of calibration indicator into the anhydrous sodium carbonate solution, titrating the anhydrous sodium carbonate solution with a standard acid solution to change the anhydrous sodium carbonate solution from green to dark red, continuously titrating to dark red after boiling, and paralleling for three times;
the concentration of the anhydrous sodium carbonate solution is 0.035-0.040 mol/L, and the volume of the anhydrous sodium carbonate solution is 46-55 mL.
5. The detection method according to claim 4, wherein the titration indicator is prepared by mixing 3-5 volume ratio: 4-6: 1-2 of cresol red ethanol solution, methyl red ethanol solution and methylene blue aqueous solution;
the concentration of the cresol red ethanol solution is 1-2 g/L, the concentration of the methyl red ethanol solution is 2-3 g/L, and the concentration of the methylene blue water solution is 1-2 g/L.
6. The detection method according to any one of claims 1 to 5, wherein the residual alkali is sodium hydroxide and/or sodium carbonate.
7. The detection method according to claim 6, wherein the sodium hydroxide content is measured by: taking a liquid to be detected, adding 7-10 drops of a titration indicator to obtain blue, titrating the liquid to be detected to be bright green by using a calibrated standard acid solution, and recording the volume V of the calibrated standard acid solution consumed by a color-changing point1。
8. The detection method according to claim 7, wherein the sodium hydroxide content is measured by the formula: wNaOH％＝V1×C×M1×100/(m1×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M1Is the molar mass of sodium hydroxide, m1The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
9. The detection method according to claim 8, wherein the content of sodium carbonate is measured by: taking the liquid to be detected, adding 7-10 drops of titration indicator to obtain blue liquid, titrating the blue liquid by using the calibrated standard acid solution until the volume consumed by green record is V2Continue titration to dark red recording consumption volume of V3。
10. The detection method according to claim 9, characterized in that the measurement formula of the sodium carbonate content is: wNa2CO3％＝(V3-V2)×C×M2×100/(m2×1000)；
Wherein C is the molar concentration of the calibrated standard acidic solution, M2Is carbonMolar mass of sodium salt, m2The mass of the leachate after high-speed centrifugation corresponds to the mass of the cathode material of the sodium-ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110377510.0A CN113092458A (en) | 2021-04-08 | 2021-04-08 | Method for detecting residual alkali content on surface of cathode material of sodium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110377510.0A CN113092458A (en) | 2021-04-08 | 2021-04-08 | Method for detecting residual alkali content on surface of cathode material of sodium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113092458A true CN113092458A (en) | 2021-07-09 |
Family
ID=76675500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110377510.0A Pending CN113092458A (en) | 2021-04-08 | 2021-04-08 | Method for detecting residual alkali content on surface of cathode material of sodium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113092458A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907625A (en) * | 2017-11-03 | 2018-04-13 | 山西长征动力科技有限公司 | A kind of detection method of lithium electricity tertiary cathode material surface residual alkali content |
| CN111289686A (en) * | 2020-03-06 | 2020-06-16 | 凤阳泰和九思科技有限公司 | Method for measuring content of residual alkali in solution and application thereof |
-
2021
- 2021-04-08 CN CN202110377510.0A patent/CN113092458A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907625A (en) * | 2017-11-03 | 2018-04-13 | 山西长征动力科技有限公司 | A kind of detection method of lithium electricity tertiary cathode material surface residual alkali content |
| CN111289686A (en) * | 2020-03-06 | 2020-06-16 | 凤阳泰和九思科技有限公司 | Method for measuring content of residual alkali in solution and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 质量技术监督行业职业技能鉴定指导中心: "《化学检验 第2版》", 31 July 2010 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103149073B (en) | X-ray fluorescence spectra analyzes the MTG YBCO bulk method of ferrosilicon, Si-Ca-Ba, silicomanganese, ferro-aluminum or ferro-titanium sample | |
| AU2009354555A1 (en) | Method for analyzing and detecting calcium element in ore | |
| CN103954617B (en) | Method for detecting content of lithium carbonate | |
| CN108181428A (en) | A kind of detection method of boracic tertiary cathode material remnants alkali contents | |
| CN101413894A (en) | Iodine content on site rapid quantitative detection reagent in common salt added with iodine and preparation process thereof | |
| CN105954341A (en) | Method for continuous analysis determination of calcium oxide and magnesium oxide in limestone | |
| CN102998274A (en) | Method for rapidly measuring total sulfur content in black pulping liquor | |
| CN107703138A (en) | The detection method of acidity in lithium ion battery electrolyte lithium salts and electrolyte | |
| CN103901018A (en) | Measurement method for content of magnesium and content of aluminium in main component of pyrotechnic composition for fireworks and crackers | |
| US10274458B2 (en) | Method for detecting surface coating performance of cathode active material | |
| CN103776953A (en) | Determination method of content of cobalt in lithium battery ternary positive electrode material | |
| CN113281457A (en) | Method for rapidly determining content of free acid in lithium hexafluorophosphate electrolyte through low-temperature linear titration | |
| CN113092458A (en) | Method for detecting residual alkali content on surface of cathode material of sodium ion battery | |
| CN111289686A (en) | Method for measuring content of residual alkali in solution and application thereof | |
| CN115598287B (en) | Method for detecting copper content in conductive paste | |
| CN105842388A (en) | Method for measuring sodium carbonate in sintering synergist through acid-base titration | |
| CN115792095B (en) | Nonaqueous detection method for residual alkali on surface of positive electrode active material and application | |
| CN110220887B (en) | Method for measuring lead, zinc, tin and nickel in waste circuit board stripping material resin powder | |
| CN114280221A (en) | Method for detecting phosphorus content | |
| CN104280368A (en) | Method for efficiently and accurately detecting main content of industrial magnesium oxide | |
| CN102901765A (en) | Potentiometric titration method for measuring content of Hg<2+> in solution | |
| CN104764633B (en) | Chemical sample preparation method for testing heavy metal content in soil and sewage | |
| CN112033922A (en) | Method for detecting purity of lithium perchlorate | |
| CN111504751A (en) | Sample pretreatment method for determining total iron content | |
| CN110850025A (en) | Method for determining chloride ion content in industrial iron oxide by automatic potentiometric titration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210709 |