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Method for evaluating battery material of lithium ion battery by using symmetric battery

A lithium-ion battery and symmetrical battery technology, applied in the field of lithium-ion batteries, can solve the problems that electrode materials cannot be returned, electrode material evaluation cannot accurately reflect the actual state of materials, and electrode material research is lacking, so as to achieve accurate electrochemical performance.

Inactive Publication Date: 2018-09-07
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on positive and negative electrode materials before the preparation of lithium-ion batteries is relatively sufficient, but the research on electrode materials after preparation of lithium-ion batteries is relatively lacking.
The main reason is that after the battery is prepared, the electrode material cannot return to the original state after charging and discharging, such as the negative electrode material cannot be completely delithiated, etc. In this case, the evaluation of the lithium ion battery electrode material cannot accurately reflect the quality of the material. actual state

Method used

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  • Method for evaluating battery material of lithium ion battery by using symmetric battery
  • Method for evaluating battery material of lithium ion battery by using symmetric battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] The method for evaluating the battery material of a lithium-ion battery using a symmetrical battery of the present invention comprises the following steps:

[0031] 1) Take the qualified lithium-ion battery A just produced, charge and discharge at a rate of 1C for 50 cycles, and then charge at a rate of 0.1C to a charge capacity of 50% SOC.

[0032] 2) Disassemble the lithium-ion battery charged to 50% SOC in step 1) in the glove box, take out the positive electrode sheet, and punch the positive electrode sheet into a disc with a diameter of 12.5 mm. Take two positive discs to assemble the button battery. The specific steps are: assemble in the order of positive shell, positive plate, diaphragm with a diameter of 16mm, positive plate, spring plate, and negative shell, and add 4 drops of lithium-ion battery electrolyte ,seal. Then apply a pressure of 0.09 MPa on both sides of the coin cell for 1 second, and then let it stand at room temperature and pressure for 24 hours...

Embodiment 2

[0039] The method for evaluating the battery material of a lithium-ion battery using a symmetrical battery of the present invention comprises the following steps:

[0040] 1) Take the qualified lithium-ion battery C just produced, charge and discharge at a rate of 1C for 50 cycles, and then charge at a rate of 0.1C to a charge capacity of 50% SOC.

[0041] 2) Disassemble the lithium-ion battery charged to 50% SOC in step 1) in the glove box, take out the negative electrode sheet, and punch the negative electrode sheet to obtain a disc with a diameter of 12.5 mm. Take two pieces of negative electrode discs to assemble the button battery. The specific steps are: assemble in the order of positive electrode case, negative electrode sheet, diaphragm with a diameter of 16mm, negative electrode sheet, spring sheet, and negative electrode case, and add 2 drops of lithium-ion battery electrolyte ,seal. Then apply a pressure of 0.1 MPa on both sides of the coin cell for 1 second, and t...

Embodiment 3

[0048] The method for evaluating the battery material of a lithium-ion battery using a symmetrical battery of the present invention comprises the following steps:

[0049] 1) Take the qualified lithium-ion battery E just produced, charge and discharge at a rate of 1C for 50 cycles, and then charge at a rate of 0.1C to a charge capacity of 50% SOC.

[0050] 2) Disassemble the lithium-ion battery charged to 50% SOC in step 1) in the glove box, take out the positive electrode sheet, and punch the positive electrode sheet into a disc with a diameter of 12.5 mm. Take two positive discs to assemble the button battery. The specific steps are: assemble in the order of positive shell, positive plate, diaphragm with a diameter of 16mm, positive plate, spring plate, and negative shell, and add 3 drops of lithium-ion battery electrolyte ,seal. Then apply a pressure of 0.1 MPa on both sides of the coin cell for 1 second, and then stand at room temperature and pressure for 22 hours.

[00...

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Abstract

The invention relates to a method for evaluating the battery material of a lithium ion battery by using a symmetric battery, and belongs to the technical field of lithium ion batteries. The method forevaluating the battery material of the lithium ion battery using the symmetric battery comprises the following steps: 1) disassembling the lithium ion battery to obtain pole pieces, and taking and assembling the pole pieces with the same polarity to form the symmetric battery; 2) performing electrochemical test on the symmetrical battery obtained in step 1); and 3) evaluating the battery materialaccording to an electrochemical test result obtained in step 2). The method for evaluating the battery material of the lithium ion battery by using the symmetric battery can accurately test the performances of the pole material, in different states, of the total lithium ion battery in order to prevent no direct test of the performances of the pole material in different states due to the influences of the surrounding environment.

Description

technical field [0001] The invention relates to a method for evaluating battery materials of lithium-ion batteries by adopting symmetrical batteries, and belongs to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in the field of 3C portable electronic devices since their commercial application. In recent years, it has also developed rapidly in fields such as electric vehicles. [0003] When a lithium-ion battery is charged, lithium ions are extracted from the positive electrode and inserted into the negative electrode to form lithium; when discharging, lithium is extracted from the negative electrode and re-inserted into the positive electrode. Therefore, the charge-discharge capacity of the positive and negative electrode materials of lithium-ion batteries, the cycle stability of materials, and the rate performance of materials are all related to the insertion and extraction of lithium ions. Through t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 李莉赵永锋李云峰许飞李亚南刘兴福罗传军戚凤晓席凯凯王玉峰
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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