Method for detecting lithium-embedded pole piece of lithium ion secondary battery

A technology for secondary batteries and detection methods, which is applied to measurement devices, material inspection products, and preparation of test samples, etc., can solve the problems of fire and burning equipment, damage, affecting the analysis and judgment of pole piece testing, and achieves simple, low cost effect

Inactive Publication Date: 2020-05-05
ZHEJIANG ZHENENG TECHN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the negative electrode sheet in the lithium-intercalated state has higher activity, especially the fully charged lithium-carbon compound LiC in a golden yellow state. 6 At this time, the negative electrode is easily oxidized by the pollution of water and oxygen, which will affect the test analysis and judgment of the electrode, and even cause fire and combustion to cause damage to the instrument.

Method used

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  • Method for detecting lithium-embedded pole piece of lithium ion secondary battery
  • Method for detecting lithium-embedded pole piece of lithium ion secondary battery
  • Method for detecting lithium-embedded pole piece of lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0038] like figure 1 As shown, the negative electrode sheet in the normal lithium intercalation area was pasted with Kapton-polyimide tape. In the dew point room, an iron-lithium 80Ah square aluminum shell battery cell that failed in the standard cycle was dissected. The core failed; it was taken out after dissection, and there were "lithium analysis" and "black spots" among them. After taking it out of the dew point room, carry out XRD test on the negative plate of the failed cell, the test result is as follows: figure 2 shown; where only LiC exists in the "dark spot" area 12 and graphite phase diffraction peaks, only Li and LiC exist in the "lithium analysis" region 12 Phase diffraction peaks, there are Li, LiC in the normal lithium intercalation region 12 and LiC 6 phase, but LiC 12 The relative peak intensity of the phase is significantly higher than that of LiC 6 Mutually;. LiC was not detected in both the "black spot" and "lithium analysis" regions 6 phase, ind...

Embodiment 2

[0040] The normal 10Ah iron-lithium soft-packed cells with the state of charge kept at 40%, 60%, 80% and 100% (full charge state) SOC were dissected in the glove box, and the water and oxygen content in the glove box were all ≤ 1ppm ;Respectively take a piece of negative electrode sheet of the battery cell whose state of charge is maintained at 40%, 60%, 80% and 100%, and paste Kapton-polyimide high-temperature tape; take the negative electrode sheet with the tape attached XRD test. Test results such as image 3 shown.

[0041] It can be concluded that the negative electrode Li in different states of charge x C 6 (06 and LiC 12 The relative peak intensity of the phase can indirectly judge the intercalation of lithium ions in the graphite layer gap and the rationality of the N / P ratio in the design of the cell.

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Abstract

The invention relates to a method for detecting a lithium-embedded pole piece of a lithium ion secondary battery. The method comprises the following steps of: S1, dissecting a failed battery cell in adew point room or a glove box; S2, in a dew point room or a glove box, taking out an abnormal to-be-detected negative plate after dissection; S3, protecting a to-be-tested area of the abnormal to-be-detected negative plate in a dew point room or a glove box; S4, taking out the negative plate treated in the step S3 from the dew point room or the glove box; and S5, carrying out a characterization test on the taken-out negative plate. The beneficial effects of the method are that: through adhering an adhesive tape to the surface of a charged negative plate or a mold is additionally arranged forpackaging, the test which can only be performed in a dew point room or a glove box becomes possible in a normal environment. The method is simple and low in cost, the test result is hardly influencedby adhesion of the adhesive tape or installation of the mold, and the judgment of the test result and failure analysis is not influenced.

Description

technical field [0001] The invention relates to the research field of failure analysis of decommissioned lithium-ion batteries, and particularly includes a detection method for lithium-intercalated pole pieces of lithium-ion secondary batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, no memory effect, long cycle life, no pollution, and small self-discharge, making them the main competitors of the new generation of power batteries. At present, the first generation of power batteries has reached the limit of its life, so the recycling of power batteries has great market prospects, environmental permission and resource regeneration. The recycling of power batteries includes cascade utilization and recycling. It refers to the process in which power batteries are reapplied to other target fields after being decommissioned from electric vehicles, and all or part of their functions continue to be used. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/28G01N1/36
CPCG01N33/00G01N1/28G01N1/36G01N2033/0077G01N2001/366
Inventor 成城马福元寿春晖赵宇吴田熊兴海
Owner ZHEJIANG ZHENENG TECHN RES INST
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