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A rapid detection method for the cycle life of a positive electrode material

A cathode material and detection method technology, applied in the direction of material analysis, chemical method analysis, material excitation analysis, etc., can solve the problems of low accuracy, small scope of application, and inability to truly reflect the performance of cathode materials

Pending Publication Date: 2020-07-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a small scope of application, and it cannot truly reflect the overall performance of the cathode material, and its accuracy is low

Method used

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  • A rapid detection method for the cycle life of a positive electrode material
  • A rapid detection method for the cycle life of a positive electrode material
  • A rapid detection method for the cycle life of a positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Accurately weigh five kinds of LiFePO, LFPⅠ, LFPⅡ, LFPⅢ, LFPⅣ and LFPⅤ 4 Add 1.000g of each powder into a 2000ml large beaker;

[0101] (2) Put in a clean magnetic stirrer, accurately measure 1000ml of HCl solution with a concentration of 0.1mol / L and add it to a large beaker, and start the stirring reaction at room temperature;

[0102] (3) Timing for 5 minutes, using a 0.22 μm microporous needle filter membrane to rapidly filter and separate the reaction supernatant;

[0103] (4) Send the reaction clear solution to ICP within 2 hours to detect the concentration of dissolved Fe element.

Embodiment 2

[0105] Five LiFePO 4 The detection process of the powder is the same as in Example 1, except that the concentration of HCl used is 0.01mol / L.

Embodiment 3

[0107] Five LiFePO 4 The detection process of the powder is the same as in Example 1, except that the volume of HCl used is 100ml.

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Abstract

The invention relates to a rapid detection method for the cycle life of a positive electrode material. Specifically, the invention relates to a rapid detection method for the cycle life of a LiFePO4 positive electrode material, and the method comprises the following steps: (1) mixing powder of the LiFePO4 positive electrode material with an acidic solution to carry out a reaction; (2) carrying outsolid-liquid separation on the reaction mixture to obtain filtrate and insoluble substances; and (3) detecting the concentration CFe of the metal element Fe in the filtrate, and evaluating the cyclelife of the LiFePO4 positive electrode material according to the concentration CFe of the metal element Fe. By adopting the method disclosed by the invention, the metal dissolution properties of different LiFePO4 positive electrode materials can be rapidly detected and compared, so that the cycle life of the positive electrode materials and the cycle life of a battery cell or a battery obtained from the positive electrode materials can be rapidly predicted. The method disclosed by the invention is particularly used for evaluating the service life of the LiFePO4 positive electrode material andselecting the long-service-life LiFePO4 positive electrode material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials. Specifically, the present invention relates to a rapid detection method for the cycle life of positive electrode materials. The invention also relates to a rapid comparison method for the cycle life of positive electrode materials. Background technique [0002] As an efficient energy storage and conversion device, compared with traditional nickel-based batteries and lead-acid batteries, lithium-ion secondary batteries have obvious advantages in terms of energy density, cycle life and environmental friendliness. As a key component of the lithium-ion secondary battery, the positive electrode material can directly determine the performance and service life of the battery. For example, with LiFePO 4 Lithium-ion batteries as cathode materials are widely used in urban public transportation power systems due to their long cycle life, high safety performance and low cost, and have importan...

Claims

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Application Information

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IPC IPC(8): G01N31/00G01N17/00G01N21/73G01R31/385
CPCG01N17/00G01N33/2028G01R31/392
Inventor 夏青刘晓梅郑先锋刘江王国宝
Owner CONTEMPORARY AMPEREX TECH CO
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