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Method for detecting content of residual lithium carbonate in high-nickel ternary positive electrode material

A positive electrode material and detection method technology, applied in chemical analysis by titration method, chemical analysis by combustion, etc., can solve problems such as undetectable content and affecting material performance evaluation

Pending Publication Date: 2021-09-10
WANXIANG 123 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem that the residual lithium carbonate content in the current high-nickel ternary positive electrode material cannot be detected and affects the evaluation of material performance, the purpose of the present invention is to provide a detection method for the residual lithium carbonate content in the high-nickel ternary positive electrode material, which can measure Internal lithium carbonate content, thus providing a more reliable basis for evaluating the performance of high-nickel ternary cathode materials

Method used

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  • Method for detecting content of residual lithium carbonate in high-nickel ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The detection method of residual lithium carbonate content inside the high-nickel ternary positive electrode material comprises the following steps:

[0031] (1) LiNi, a high-nickel ternary cathode material with a D50 of 10.5 μm 0.83 co 0.12 mn 0.05 Soluble in water, 5g of nickel positive electrode material, 100mL of water, seal and wrap with parafilm and magnetically stir at a speed of 100r / min, stir for 120min, then filter and take 10mL of filtrate, titrate with 0.5mol / L dilute hydrochloric acid in an automatic titrator, Two voltage platforms appear successively, and record the volumes a1 and a2 of the dilute hydrochloric acid solution corresponding to the two voltage platforms, and then according to the formula:

[0032] T1(wt%)=12.0107*(a2-a1)*c / (1000*m*v2 / v1) calculates the carbon content in lithium carbonate on the surface of the high-nickel ternary positive electrode material;

[0033] (2) Simultaneously take 0.1g of the same high-nickel ternary cathode materi...

Embodiment 2

[0040] The detection method of residual lithium carbonate content in the high-nickel ternary positive electrode material differs from Example 1 in that the mass-to-volume ratio of the high-nickel ternary positive electrode material and solvent water in step (1) is 6g:100mL.

Embodiment 3

[0042] The detection method of residual lithium carbonate content in the high-nickel ternary positive electrode material differs from Example 1 in that the mass-to-volume ratio of the high-nickel ternary positive electrode material and solvent water in step (1) is 10g:100mL.

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Abstract

The invention relates to the technical field of lithium content testing in a nickel positive electrode material, and provides a method for detecting the content of residual lithium carbonate in a high-nickel ternary positive electrode material aiming at the problem that the content of residual lithium carbonate in the high-nickel ternary positive electrode material cannot be detected so that material performance evaluation is influenced. The method comprises the steps of taking the high-nickel ternary positive electrode material and dissolving in a solvent; titrating the filtrate with an acid solution after filtration, and calculating the surface carbon content T1 of the high-nickel ternary positive electrode material; carrying out high-temperature calcination on the high-nickel ternary positive electrode material in a carbon-sulfur analyzer to obtain the total carbon content T2; calculating the internal carbon content of the high-nickel ternary positive electrode material according to T2-T1, and the internal carbon content representing the content of internal residual lithium carbonate. According to the testing method, the content of residual lithium carbonate in the high-nickel ternary material can be accurately detected, so that a more reliable basis is provided for evaluating the stability of the high-nickel ternary positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium content testing in nickel positive electrode materials, in particular to a detection method for residual lithium carbonate content in high-nickel ternary positive electrode materials. Background technique [0002] With the increasing demand for high-energy-density lithium-ion batteries, high-nickel ternary materials have attracted widespread attention due to their high capacity and low raw material costs. However, due to the stability of the material structure caused by the high Ni content and the increase in the difficulty of synthesis and processing, large-scale production and use are hindered, especially the existence of residual lithium, namely lithium carbonate and lithium hydroxide, will affect the production and production of later batteries. Cycling stability performance is seriously affected. Therefore, it is necessary to detect the amount of residual lithium in the high-nickel ternary c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N31/12
CPCG01N31/16G01N31/12
Inventor 王军华王锭笙曹杰郑利峰
Owner WANXIANG 123 CO LTD