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Method for detecting residual free lithium content in ternary anode material

A detection method and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of inconspicuous color mutation, increased residual free lithium content, and poor accuracy of test results, achieving high precision, enhanced stability, and small error effects

Inactive Publication Date: 2019-06-21
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ternary materials can easily increase the residual free lithium content on the surface during the lithium-mixed sintering stage, resulting in higher requirements for material storage and application environments.
[0004] The current test methods for free lithium include indicator method and potentiometric titration method. The color mutation measured by the indicator method is not obvious, which is not conducive to the judgment of the end point and affects the accuracy of the test.
In the potentiometric titration method, the SET pH setting end point mode has poor test result accuracy and is not conducive to judging whether there is interference from other substances in the test

Method used

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  • Method for detecting residual free lithium content in ternary anode material
  • Method for detecting residual free lithium content in ternary anode material
  • Method for detecting residual free lithium content in ternary anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 LiNi0.8Co0.8Mn0.1O 2 Detection method of residual free lithium content in

[0023] Take 5g LiNi0.8Co0.8Mn0.1O 2 The sample of ternary positive electrode material is placed in a 100mL conical flask with a stopper, accurately weighed, and the mass of the sample is recorded in m1. The magnetic stirrer is increased in the bottle, and 100g of boiled distilled water is accurately weighed in a conical flask with a stopper, and recorded. The mass of distilled water is m2. Close the Erlenmeyer flask with a non-porous rubber stopper.

[0024] Open the rubber stopper, stuff it into a stoppered Erlenmeyer flask with a self-made gas replacement device, and use nitrogen to replace the gas in the bottle. The purging time is about 10 minutes. After purging, immediately stop the cork with a rubber stopper.

[0025] Place the Erlenmeyer flask with a stopper on a magnetic stirrer at room temperature and stir for 30 minutes, and adjust the rotation speed to the maximum, while ...

Embodiment 2

[0032] Example 2 LiNi0.8Co0.1Mn0.1O 2 Detection method of residual free lithium content in

[0033] Take 6gLiNi0.8Co0.8Mn0.1O 2 The sample of ternary positive electrode material is placed in a 100mL conical flask with a stopper, accurately weighed, and the mass of the sample is recorded in m1. The magnetic stirrer is increased in the bottle, and 90g of boiled distilled water is accurately weighed in a conical flask with a stopper, and recorded. The mass of distilled water is m2. Close the Erlenmeyer flask with a non-porous rubber stopper.

[0034] Open the rubber stopper, stuff it into a stoppered Erlenmeyer flask with a self-made gas replacement device, use nitrogen to replace the gas in the bottle, and purge for about 5 minutes. After the purge is completed, immediately plug the bottle with a rubber stopper.

[0035] Place the Erlenmeyer flask with a stopper on a magnetic stirrer at room temperature and stir for 40 minutes, and adjust the rotation speed to the maximum, wh...

Embodiment 3

[0042] Example 3 LiNi0.8Co0.1Mn0.1O 2 Detection method of residual free lithium content in

[0043] Take 4gLiNi0.8Co0.8Mn0.1O 2 The sample of ternary positive electrode material is placed in a 100mL conical flask with a stopper, accurately weighed, and the mass of the sample is recorded in m1. The magnetic stirrer is increased in the bottle, and 100g of boiled distilled water is accurately weighed in a conical flask with a stopper, and recorded. The mass of distilled water is m2. Close the Erlenmeyer flask with a non-porous rubber stopper.

[0044] Open the rubber stopper, stuff it into a stoppered Erlenmeyer flask with a self-made gas replacement device, use nitrogen to replace the gas in the bottle, and purge for about 15 minutes. After the purge is completed, immediately plug the bottle with a rubber stopper.

[0045] Place the stoppered Erlenmeyer flask on a magnetic stirrer at room temperature and stir for 10 minutes, and adjust the speed to the maximum, while avoiding...

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Abstract

The invention relates to a method for detecting a residual free lithium content in a ternary anode material. The method comprises the following steps of in a closed conical flask, using a m1g ternaryanode material and m2g boiled distilled water to prepare a solution; using a nitrogen gas to carry out air emptying in a bottle; carrying out magnetic stirring at a room temperature and standing; using a needle filter to rapidly filter the solution into a collecting bottle so as to prepare a liquid to be tested; taking the m3g liquid to be tested to mix with the boiled distilled water for dynamicpotentiometric titration, and recording volumes V1 and V2 corresponding to a jump point; and calculating contents of Li2CO3 and LiOH through using the following formulas: WLi2CO3=CHCl*(V2-V1)*73.89 / 1000 / (m1*m3 / m2)*100%; and WLiOH=CHCl*(2V1-V2)*23.941 / 1000 / (m1*m3 / m2)*100%. By using the method for detecting the residual free lithium content in the ternary anode material, an error of a detection result is small, precision is high, and an interference condition during a testing process can be effectively determined.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for detecting residual free lithium content in a ternary positive electrode material. Background technique [0002] With the promotion of new energy vehicles, power lithium-ion batteries have been greatly developed. At the same time, new energy vehicles have high requirements for mileage, and there are also high requirements for energy density, high cycle performance and high safety performance of lithium-ion batteries. Require. At present, the main research direction is to increase the gram capacity of the material, and the ternary material has become the focus of attention of the positive electrode material because of its high capacity. [0003] Ternary materials can easily increase the residual free lithium content on the surface during the lithium-mixed sintering stage, resulting in higher requirements for material storage and application environments....

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/34G01N1/38
Inventor 蔡君瑶何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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