Non-destructive detection lithium ion battery anode reversible lithium loss method

A lithium-ion battery, non-destructive testing technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of risk, time-consuming, difficult operation, etc., to quantify the reversible lithium loss of the positive electrode, reduce risk, and be good The effect of practicality and feasibility

Active Publication Date: 2019-06-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A non-destructive detection method for reversible lithium loss in the positive electrode of lithium-ion batteries proposed by the present invention can solve the technical problems that the existing lithium battery damage detection methods are not only time-consuming, difficult to operate, but also risky

Method used

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  • Non-destructive detection lithium ion battery anode reversible lithium loss method
  • Non-destructive detection lithium ion battery anode reversible lithium loss method
  • Non-destructive detection lithium ion battery anode reversible lithium loss method

Examples

Experimental program
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Embodiment 1

[0029] In this embodiment, a soft pack cell with a capacity of 5.6Ah is used, and the system is an LFP / C system. The system specifies a lower limit voltage of 2.0V and a specified upper limit voltage of 3.65V.

[0030] a. Make a soft-pack laminated battery, wherein there are 13 positive poles and 14 negative poles. A reference with a diameter of 25 μm is added between the positive and negative poles. The reference and the positive and negative poles are separated by a diaphragm, and then Liquid injection package.

[0031] b. Form the three-electrode battery produced in step a at 25°C. The formation process is 0.02C constant current charge for 4 hours, rest for 10 minutes, and 0.1C constant current charge for 2 hours. Then the three-electrode battery was divided at 25°C. The capacity division process was 0.1C constant current and constant voltage charge to 3.65V, cut-off current was 0.05C, shelved for 30min, 0.33C discharged to 2.0V, shelved for 30min, and then 0.33C constant ...

Embodiment 2

[0034] Change the number of cycles to 2000, and other experimental conditions are the same as in Example 1. The negative-to-parameter charging curve for 2000 cycles is shown in 4, and the reversible lithium loss of the positive electrode is 1.296Ah. The results are shown in Table 1.

[0035]

[0036]

[0037] Table 1 shows the reversible lithium loss of the positive electrode for different cycles of 1C cycle at 25°C

Embodiment 3

[0039] In this embodiment, a soft pack cell with a capacity of 5.6Ah is used, and the system is an LFP / C system. The system specifies a lower limit voltage of 2.0V and a specified upper limit voltage of 3.65V.

[0040] a. Make a soft-pack laminated battery, wherein there are 13 positive poles and 14 negative poles. A reference with a diameter of 25 μm is added between the positive and negative poles. The reference and the positive and negative poles are separated by a diaphragm, and then Liquid injection package.

[0041] b. Form the three-electrode battery produced in step a at 25°C. The formation process is 0.02C constant current charge for 4 hours, rest for 10 minutes, and 0.1C constant current charge for 2 hours. Then the three-electrode battery was divided at 25°C. The capacity division process was 0.1C constant current and constant voltage charge to 3.65V, cut-off current was 0.05C, shelved for 30min, 0.33C discharged to 2.0V, shelved for 30min, and then 0.33C constant ...

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Abstract

The invention discloses a non-destructive detection lithium ion battery anode reversible lithium loss method. By using the method, problems that an existing lithium battery destructive detection method is time-consuming and difficult to operate and has a risk are solved. The method comprises the following steps of a, making a soft-packing laminated battery, adding a reference between an anode anda cathode, and assembling into a soft-packing three-electrode battery; b, forming the three-electrode battery manufactured in the step a at 25+ / -2 DEG C and dividing a volume; and c, carrying out a charge-discharge cycle on the three-electrode battery in the step b at a set temperature, monitoring voltage changes of the three-electrode battery, drawing a negative pair parameter initial and cycledV-Q curve, and according to the negative pair parameter initial and cycled V-Q curve, calculating an anode reversible lithium loss amount. In the invention, through three electrodes, three de-intercalation lithium platform changes of graphite are monitored, an anode reversible lithium loss is quantified, an operation risk is reduced; and a test method is simple and easy, a test result is accurateand reliable, and good practicability and feasibility are achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for non-destructive detection of reversible lithium loss at positive electrodes of lithium-ion batteries. Background technique [0002] Under the main pattern of rapid development of large-scale energy storage, smart grid, clean energy vehicles and consumer electronics, people have higher and higher requirements for the performance, reliability and safety of energy storage devices. Lithium-ion batteries have become one of the most widely used and most mature electrochemical energy storage devices due to their advantages such as high energy / power density, long cycle life, and high rate performance. Lithium iron phosphate and lithium-containing transition metal oxides (such as LiCoO2, LiMn2O4, LiNi1 / 3Co1 / 3Mn1 / 3O2, etc.) are widely used in lithium-ion batteries as lithium-ion cathode materials due to their high energy and long cycle performance. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/396G01R31/378
Inventor 邵素霞吴浩王蓉蓉吴欢欢冷飞喜吴定国
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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