Ternary lithium sintering quality testing method

Abstract

The invention discloses a ternary lithium sintering quality testing method, and belongs to the technical field of ternary lithium testing. The test method comprises the following steps: step 1, sampling sintered ternary lithium, putting the sample into a container, adding purified water, stirring, standing, taking supernatant, and filtering; step 2, transferring the filtrate into a container, adding purified water, dropwise adding a phenolphthalein indicator, titrating with a hydrochloric acid standard solution until the solution is colorless, then adding a methyl red indicator, continuously titrating with the hydrochloric acid standard solution until the solution becomes orange yellow from yellow, boiling, cooling to room temperature, and continuously titrating until the solution is wine red; and 3, recording the consumption volume of the hydrochloric acid standard solution, and calculating data according to a formula to obtain a result. The test method is simple, efficient, rapid and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of ternary lithium testing, and particularly to a method for testing the sintering quality of ternary lithium. Background Art

[0002] As a new energy industry, lithium batteries have been popularized worldwide. As a kind of cathode material for lithium-ion batteries, ternary lithium has always been the focus and development direction in the industry and has been widely used in the fields of digital products, power tools, electric vehicles, and electric cars.

[0003] The sintering of ternary lithium is one of the most common operating processes in production and has very wide applications in many fields such as food, medicine, materials, plastics, fertilizers, and metallurgy. Efficient sintering of powders is the guarantee of product quality. The quality of dry powder sintering directly affects the quality of subsequent products. Therefore, the quality detection of dry powder sintering is very important.

[0004] Due to the uncertainty of the sintering quality of ternary lithium during the sintering process, the powder sintering has become a complex random process, and the evaluation and measurement methods of sintering quality have always troubled people. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a simple, efficient, rapid, and accurate method for testing the sintering quality of ternary lithium.

[0006] To achieve the above invention purpose, the present invention adopts the following technical scheme: A method for testing the sintering quality of ternary lithium, comprising the following steps:

[0007] Step 1: Sampling the sintered ternary lithium material, placing it in a container, adding pure water, stirring and standing, and filtering the supernatant.

[0008] Step 2: Transferring the filtrate to a container, adding pure water, dropping phenolphthalein indicator, titrating with a hydrochloric acid standard solution until it becomes colorless, then adding methyl red indicator, continuing to titrate with the hydrochloric acid standard solution until it changes from yellow to orange-yellow, boiling, cooling to room temperature, and then continuing to titrate until it becomes wine-red as the end point.

[0009] Step 3: Recording the volume of the hydrochloric acid standard solution consumed, and then calculating the result according to the formula.

[0010] Further, the mass-volume ratio of the sample to pure water in Step 1 is 3:10 (g / ml).

[0011] Further, the stirring speed in Step 1 is 480 - 540 revolutions per minute, stirring for 25 - 45 minutes, and the standing time is 1 - 5 minutes.

[0012] Further, the volume ratio of the filtrate in Step 2 to pure water is 1:3.

[0013] Further, the dosage of phenolphthalein indicator in Step 2 is 2 drops per 30 ml of pure water.

[0014] Further, the dosage of methyl red indicator in Step 2 is 2 drops per 30 ml of pure water.

[0015] Further, the concentration of the standard hydrochloric acid solution in Step 2 is 0.2 mol / L.

[0016] Further, the boiling time in Step 2 is 1 - 3 min.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The quality test method for sintering ternary lithium of the present invention is simple, accurate, fast and efficient in operation.

[0019] 2. The quality test method for sintering ternary lithium of the present invention optimizes the process, saving time and effort.

[0020] 3. The quality test method for sintering ternary lithium of the present invention knows the quality of sintering, increasing the effectiveness and accuracy of the test.

[0021] 4. The quality test method for sintering ternary lithium of the present invention can preliminarily determine the approximate performance of the later-stage material according to the sintering quality, ensuring the production of high-quality ternary lithium. Specific Embodiments

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0023] Example 1

[0024] The embodiment of the present invention provides a quality test method for sintering ternary lithium, including the following steps:

[0025] (1) Take a sample from a point of the sintered ternary lithium material, accurately weigh 30 g of the sample into a 250-ml Erlenmeyer flask, add 100 ml of pure water to the flask, add a magnetic stir bar to the flask, cover it, place it on a magnetic stirrer, with a rotation speed of 520, and stir for 30 minutes. After stirring is completed, let the flask stand for 2 minutes, take the supernatant and filter it through a funnel with two layers of filter paper, and filter the filtrate into a 25-ml small beaker.

[0026] (2) Accurately pipette 10 ml of the filtrate into a 250-ml conical flask, add 30 ml of pure water, add 2 drops of phenolphthalein indicator to the added filtrate, titrate with 0.2 mol / L hydrochloric acid standard solution until it becomes colorless, then add 2 drops of methyl red indicator, continue to titrate with 0.2 mol / L hydrochloric acid standard solution until it changes from yellow to orange-yellow, boil for 1 minute, cool to room temperature and continue titrating until it becomes wine-red as the end point and record the volume of hydrochloric acid consumed as 7 ml.

[0027] (3) Then, according to the formula Li2CO3 = V * C * 73.886 / m, where: V is the volume of hydrochloric acid consumed, C is the concentration of the standard hydrochloric acid solution used, and m is the weight of the sample taken.

[0028] (4) Calculate the data to obtain the result. Thus, to judge the quality of the ternary lithium sintering.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for testing the sintering quality of ternary lithium, characterized in that, It includes the following steps: Step 1: Take a sample of the sintered ternary lithium material, place it in a container, add pure water, stir and let it stand, and filter the supernatant. Step 2: Transfer the filtrate to a container, add pure water, add phenolphthalein indicator, titrate with a standard hydrochloric acid solution until it becomes colorless, then add methyl red indicator, continue to titrate with the standard hydrochloric acid solution until it changes from yellow to orange-yellow, boil, cool to room temperature and continue titrating until it becomes wine-red as the end point. Step 3: Record the volume of the standard hydrochloric acid solution consumed, and then calculate the result according to the formula.

2. The ternary lithium sintering quality testing method according to claim 1, wherein In Step 1, the mass-volume ratio of the sample to pure water is 3:10 (g / ml).

3. The ternary lithium sintering quality testing method according to claim 1, wherein In Step 1, the stirring speed is 480 - 540 revolutions per minute, stirring for 25 - 45 minutes, and the standing time is 1 - 5 minutes.

4. The ternary lithium sintering quality testing method according to claim 1, characterized in that, In Step 2, the volume ratio of the filtrate to pure water is 1:

3.

5. The ternary lithium sintering quality testing method according to claim 1, wherein In Step 2, the dosage of phenolphthalein indicator is 2 drops per 30 ml of pure water.

6. The ternary lithium sintering quality testing method according to claim 1, wherein In Step 2, the dosage of methyl red indicator is 2 drops per 30 ml of pure water.

7. The ternary lithium sintering quality testing method according to claim 1, wherein In Step 2, the concentration of the standard hydrochloric acid solution is 0.2 mol / L.

8. The ternary lithium sintering quality testing method according to claim 1, wherein In Step 2, the boiling time is 1 - 3 minutes.