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Method for testing lithium manganate material performance

A material performance, lithium manganate technology, which is applied in the field of lithium battery cathode material performance measurement, can solve the problems of time-consuming testing and long testing cycle, and achieve the effects of short measurement time, simple measurement method and low equipment requirements.

Inactive Publication Date: 2013-04-03
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of traditional testing methods, and provide a method for measuring the performance of lithium manganese oxide materials to solve the problems of time-consuming testing and long testing cycles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for measuring lithium manganate material performance, is characterized in that, comprises the following steps:

[0025] 1) Determination of pH value of lithium manganate material:

[0026] Add 4g of chemical formula Li to 75ml of water 1.04 mn 1.96 o 4 (δ=0.04) lithium manganese oxide powder, mixed evenly, to get a mixed solution, use Ag / AgCl (electrolyte solution is 3mol / L KCl) electrode Metrohm pH meter to measure the pH value of the mixed solution, the measured pH value is 7, indicating that the lithium manganese oxide material is neutral;

[0027] 2) Chemical delithiation of lithium manganate material:

[0028] At a temperature of 25°C, use a stirring rod to stir the mixed solution at a speed of 10 rpm for chemical delithiation, and titrate 46 ml of 1 mol / L sulfuric acid into the mixed solution at a rate of 2.5 mL / s (the sulfuric acid added is the same as the step 1) The molar ratio of the lithium element in the lithium manganese oxide added in is 2:1)...

Embodiment 2

[0045] A method for measuring lithium manganate material performance, is characterized in that, comprises the following steps:

[0046] 1) Determination of pH value of lithium manganate material:

[0047] Add 5 parts of chemical formula to LiMn in 50 parts of water by mass parts 2 o 4 (δ=0) lithium manganate powder, mixed evenly to obtain a mixed solution, and the pH value of the mixed solution was measured with a Metrohm pH meter with an Ag / AgCl (electrolyte solution of 3mol / L KCl) electrode;

[0048] 2) Chemical delithiation of lithium manganate material:

[0049] At a temperature of 20°C, use a stirring rod to stir the mixed solution at a speed of 5 rpm for chemical delithiation, and titrate 1 mol / L sulfuric acid into the mixed solution at a rate of 1 mL / s, the added sulfuric acid is the same as step 1) The molar ratio of the lithium element in the lithium manganate added in the solution is 2:1, and the pH value of the mixed solution after titration is measured with a Me...

Embodiment 3

[0053] A method for measuring lithium manganate material performance, is characterized in that, comprises the following steps:

[0054] 1) Determination of pH value of lithium manganate material:

[0055] Add 1 part of chemical formula to Li in 200 parts of water by mass parts 1.1 mn 1.9 o 4 (δ=0.1) lithium manganese oxide powder, mixed evenly to obtain a mixed solution, and a Metrohm pH meter with an Ag / AgCl (electrolyte solution of 3mol / L KCl) electrode was used to measure the pH value of the mixed solution;

[0056] 2) Chemical delithiation of lithium manganate material:

[0057] At a temperature of 40°C, use a stirring rod to stir the mixed solution at a speed of 15 rpm for chemical delithiation, and titrate 1 mol / L sulfuric acid into the mixed solution at a rate of 5 mL / s. The added sulfuric acid is the same as step 1) The molar ratio of the lithium element in the lithium manganate added in the solution is 2:1, and the pH value of the mixed solution after titration is...

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Abstract

The invention discloses a method for testing lithium manganate material performance. The method comprises the following steps of: adding 1-5 parts of lithium manganate powder into 50-200 parts of water to test a pH value of mixed liquid; stirring and titrating 1mol / L of sulfuric acid into the mixed liquid at speed of 1-5ml / S to ensure that the molar ratio of added sulfuric acid to the added lithium element in the lithium manganate is 2:1 to test the pH value of the titrated mixed liquid; calculating n according to an equation that nFdeltaE=-RT1nKeq to ensure that the theoretical capacity of n*lithium manganate is the actual capacity of the lithium manganate material, wherein Keq=0.0125, delta E is a potential difference of the pH value obtained for detection twice, F is a faraday constant, T is an absolute temperature during titration and R=8.314J / (mol.K). By the method, the chemical lithium removal action of the lithium manganate material is researched, and the actual capacity of the lithium manganate material is calculated. The method is easy, rapid, short in testing time and low in equipment requirement, and saves a large amount of capitals and test time.

Description

technical field [0001] The invention relates to a method for measuring the performance of a positive electrode material of a lithium battery, in particular to a method for measuring the performance of a lithium manganese oxide material. Background technique [0002] Lithium-ion batteries have developed rapidly since they were invented by Sony Corporation of Japan in the early 1990s. At present, the application scope has expanded from mobile communication power supplies, digital cameras, notebook computers, etc. to large energy storage batteries, power tools, electric vehicles, etc. In the field of lithium batteries, the development trend of high specific characteristics, low price and environmental protection is obvious, which benefit from the improvement and innovation of electrode materials. [0003] LiMn 2 o 4 (Lithium manganese oxide), as a cathode material for lithium-ion batteries, has the advantages of low cost, simple synthesis conditions, and good specific perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01R31/00
Inventor 高洪森
Owner IRICO
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