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Method for determining performance of cathode material for lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in material excitation analysis, material electrochemical variables, electrical excitation analysis, etc., can solve the problems of inability to become performance conditions and large result errors, and achieves small errors, high accuracy, and methods. simple effect

Inactive Publication Date: 2019-08-09
宜宾锂宝新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The error of the test result of this method is relatively large, and at the same time, the test result cannot be an indicator or basis for accurately judging the specific performance of the lithium-ion battery after the cathode material is made of the battery in the future use.

Method used

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  • Method for determining performance of cathode material for lithium ion battery
  • Method for determining performance of cathode material for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for judging the performance of a lithium-ion battery cathode material, comprising the steps of:

[0030] (a) Take 10g of the ternary positive electrode material of a lithium-ion battery, make it into a button battery, and carry out charge-discharge cycles to the button battery according to the metal dissolution charge-discharge system. After 100 cycles, the button battery is measured. The capacity retention rate is 90%, and then the button battery is disassembled to take out its pole piece;

[0031] (b) Put the electrode piece in a 100mL beaker, and add 10mL dimethyl carbonate to the beaker to infiltrate the electrode piece, then place the beaker in an ultrasonic cleaner for 10 minutes of ultrasonication, and take out the electrode piece after ultrasonication to obtain the infiltration solution , then use quantitative filter paper to filter the infiltration solution into another 100mL beaker, and use 5mL dimethyl carbonate to rinse the filter paper, and the res...

Embodiment 2

[0036] A method for judging the performance of a lithium-ion battery cathode material, comprising the steps of:

[0037] (a) Take 10g of the ternary positive electrode material of a lithium-ion battery, make it into a button battery, and carry out charge-discharge cycles to the button battery according to the metal dissolution charge-discharge system. After 100 cycles, the button battery is measured. The capacity retention rate is 85%, and then the button battery is disassembled to take out its pole piece;

[0038] (b) Put the electrode piece in a 100mL beaker, and add 10mL dimethyl carbonate to the beaker to infiltrate the electrode piece, then place the beaker in an ultrasonic cleaner for 10 minutes of ultrasonication, and take out the electrode piece after ultrasonication to obtain the infiltration solution , then use quantitative filter paper to filter the infiltration solution into another 100mL beaker, and use 5mL dimethyl carbonate to rinse the filter paper, and the res...

Embodiment 3

[0043] A method for judging the performance of a lithium-ion battery cathode material, comprising the steps of:

[0044] (a) Take 10g of the ternary positive electrode material of a lithium-ion battery, make it into a button battery, and carry out charge-discharge cycles to the button battery according to the metal dissolution charge-discharge system. After 100 cycles, the button battery is measured. The capacity retention rate is 80%, and then the button battery is disassembled to take out its pole pieces;

[0045] (b) Put the electrode piece in a 100mL beaker, and add 10mL dimethyl carbonate to the beaker to infiltrate the electrode piece, then place the beaker in an ultrasonic cleaner for 10 minutes of ultrasonication, and take out the electrode piece after ultrasonication to obtain the infiltration solution , then use quantitative filter paper to filter the infiltration solution into another 100mL beaker, and use 5mL dimethyl carbonate to rinse the filter paper, and the re...

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Abstract

The invention, which relates to the field of cathode materials for a lithium battery, discloses a method for determining the performance of a cathode material for a lithium ion battery. The method comprises: taking a cathode material of a lithium ion battery and making a battery by using the cathode material; carrying out charging-discharging circulation; after completion of the charging-discharging circulation, measuring a capacity retention ratio; taking out a pole piece of the battery, detecting a metal dissolution substance on the pole piece and thus measuring contents of all metal components in the metal dissolution substance conveniently; and on the basis of the measuring result, carrying out analysis by combining the capacity retention ratio of the battery after charging-dischargingcirculation completion to determine the performance of the cathode material of the lithium ion battery. The method is simple, efficient and accurate; the metal dissolution substance amount after charging-discharging circulation of the battery can be detected accurately; the result error is small and the accuracy is high; and thus the powerful base is provided for determining the performance of the cathode material of the lithium ion battery accurately.

Description

technical field [0001] The invention relates to the technical field of lithium battery positive electrode materials, in particular to a method for judging the performance of lithium ion battery positive electrode materials. Background technique [0002] At present, with the improvement of environmental protection requirements and the development of new energy sources, electric vehicles and other projects have been vigorously promoted and applied, and in this process, the performance requirements of batteries are also getting higher and higher. In order to meet the requirements of vehicle mileage and battery energy density Demand, cathode materials are receiving widespread attention, especially ternary cathode materials, and major material manufacturers are also working hard to further improve the performance of ternary cathode materials. In addition, the anode materials for lithium-ion batteries that have been marketed now include lithium cobalt oxide, lithium manganate, lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/67G01N27/42
CPCG01N21/67G01N27/42
Inventor 王金锋张郑颜华左美华陆永威
Owner 宜宾锂宝新材料有限公司
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