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A method and application of symmetrical battery charging and discharging to separate positive and negative electrodes for gas production

A symmetrical battery, charging and discharging technology, applied in material separation, measurement of electricity, analysis of materials, etc., can solve problems such as inseparable from electronics

Active Publication Date: 2021-10-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method adopted in the existing literature is mainly to disassemble the battery in a certain state, to package the positive and negative electrodes separately for high-temperature storage and to generate gas, and to characterize and separate the positive and negative electrode failure gas production types in a state where there is no electron participation at all. , and the gas production of lithium batteries is mainly caused by the redox decomposition of the electrolyte at the positive and negative ends, which cannot be separated from the participation of electrons

Method used

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  • A method and application of symmetrical battery charging and discharging to separate positive and negative electrodes for gas production
  • A method and application of symmetrical battery charging and discharging to separate positive and negative electrodes for gas production
  • A method and application of symmetrical battery charging and discharging to separate positive and negative electrodes for gas production

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Effect test

Embodiment 1

[0032] A method for separating positive and negative electrodes to produce gas by charging and discharging a symmetrical battery, comprising the following steps:

[0033] S1. Test the SOC-Voltage curve: make the three electrodes of the ternary laminated battery, and test the SOC-Voltage curve of its positive and negative parameters at a rate of 0.1C and 3-4.2V. For details, refer to figure 1 ;

[0034] S2. Full battery charging and discharging: charge full battery A 0.1C constant current and constant voltage to 4.2V, cut-off current is 0.05C, SOC1 is 100%, discharge full battery B 0.1C to 3V, SOC2 is 0%, among them, The three electrodes of the ternary laminated battery, the positive and negative electrodes, the diaphragm, and the electrolyte in the full battery A and the full battery B are the same, the capacity of the full battery A 0.1C is 60mAh, and the capacity of the full battery B 0.1C is 61mAh;

[0035] S3, detect positive reference and negative reference voltage: acco...

Embodiment 2

[0042] Application of a method of separating positive and negative electrode gas production from symmetrical battery charging and discharging in the analysis of battery failure types:

[0043] The specific application method is: take the full battery C, the 0.1C capacity is 63mAh, and the positive and negative electrodes, separators, and electrolytes of the full battery C are the same as the full battery A; take the full battery C, under the condition of 3-4.2V, 0.1C cycle After three weeks, gas chromatography detects the gas composition of its gas production; then compares it with the gas production of positive symmetrical battery and negative symmetrical battery, and the results can be found in Figure 4 ;

[0044] Figure 4It is the comparison result of the gas composition collected after three weeks of 0.1C cycle of the full battery C, the positive symmetrical battery and the negative symmetrical battery; Figure 4 It can be seen that the gas production composition of th...

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Abstract

The invention discloses a method for separating positive and negative electrodes to produce gas by charging and discharging a symmetrical battery. Prepare a symmetrical battery; S5, detect the voltage range of the symmetrical battery; S6, separate the positive and negative electrodes to generate gas. The present invention also proposes the application of the above-mentioned method for separating positive and negative electrodes for gas production during charging and discharging of a symmetrical battery in analyzing battery failure types. In the present invention, the positive and negative electrodes in different lithium intercalation states are assembled into a positive symmetrical battery and a negative symmetrical battery, charged and discharged, and the type of gas produced is tested by gas chromatography, and then the gas produced by the positive and negative plates is separated, and combined with the full battery Compare the types of gas produced, so as to determine the failure type of the full battery, and lay the foundation for the failure analysis of the battery.

Description

technical field [0001] The invention relates to the technical field of gas composition testing of lithium-ion batteries, in particular to a method for separating positive and negative electrodes for charging and discharging a symmetrical battery and its application. Background technique [0002] The conventional gas production components in lithium batteries mainly include oxygen, hydrogen, carbon dioxide, carbon monoxide, methane, ethane, ethylene, propane, propylene and other gases. Among them, oxygen is mainly caused by the overcharge and release of oxygen of the ternary positive electrode material and the decomposition of the SEI film of the negative electrode; carbon dioxide is mainly produced by the failure of the positive electrode; and hydrocarbon gases such as methane and ethane are mainly caused by the strong reduction of the negative electrode, which leads to the decomposition and failure of the electrolyte. [0003] At present, the method adopted in the existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3842G01R31/388G01N30/02
CPCG01N30/02G01N2030/025G01R31/3842G01R31/388
Inventor 袁雪芹王蓉蓉夏玉佳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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