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Testing method of water absorption property of high-nickel material

A technology of water absorption performance and test method, which is applied in material weighing, analyzing materials, measuring devices, etc., can solve the problems of large error in measurement results, temperature influence, poor comparability, etc., and achieve high repeatability and accurate test values. Effect

Inactive Publication Date: 2017-03-22
SINOWATT DONGGUAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the test method has a close influence on the amount of the sample, the area in contact with the air, the fluctuation of the moisture content in the ambient air, and the temperature
Therefore, the measurement results have large errors and poor comparability.

Method used

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  • Testing method of water absorption property of high-nickel material

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0022] Open the constant temperature and humidity box and set the temperature and humidity values. When the instrument runs to the set temperature and humidity, weigh a small amount of the material to be tested and place it in a balance with a measurement accuracy of 0.1 μg, automatically record the starting time and initial weight, and record the weight value according to the set interval.

[0023] Export the data and make a coordinate curve of weight and time.

[0024] Such as figure 1 It shows that in the environment of 25°C RH 40%, among the water absorption performance curves of several domestic and foreign high-nickel materials A, B, and C, the water absorption performance of material A is the worst, and its process effect is the best.

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Abstract

The invention relates to a testing method of the water absorption property of a high-nickel material. The testing environment is controlled by using a constant-temperature and constant-humidity box, full contact with the air can be guaranteed through a micro sample test, and the testing accuracy can be guaranteed by the aid of a balance with the precision being 0.1 mu g. The testing method is simple, high in accuracy, high in repeatability and very applicable to comparison of the water absorption property of samples.

Description

technical field [0001] The invention relates to a method for testing the water absorption performance of high-nickel materials. Background technique [0002] In recent years, lithium-ion batteries have been widely used in portable electronic products, power vehicles and other fields. High Ni-based layered cathode materials have superior mass specific capacity, good cycle performance and deep discharge capability, and are one of the most competitive cathode materials for lithium-ion batteries. At present, Tesla, a technological pioneer in the field of power vehicles, is using the high-nickel material NCA. [0003] One of the biggest difficulties in the production of high-nickel materials is that this material is easy to absorb water, and the water absorption of the material is not simply physical water absorption, but a chemical reaction with the absorbed water: thus changing the original surface properties of the material. [0004] LiNiCoAlO 2 + H 2 O → NiO + LiOH + O ...

Claims

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Application Information

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IPC IPC(8): G01N5/02
CPCG01N5/025
Inventor 陈述林李树军王珍珍郭密林海军
Owner SINOWATT DONGGUAN
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