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Lithium ion battery electrode cyclic attenuation mechanism evaluating method

A technology of lithium ion battery and evaluation method, which is applied in the field of evaluation of the cycle decay mechanism of lithium ion battery electrodes, can solve the problems of distinguishing, difficult failure mechanism, etc. Effect

Active Publication Date: 2019-06-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] An evaluation method for the cycle decay mechanism of lithium-ion battery electrodes proposed by the present invention can solve the technical problem that it is difficult to completely distinguish various failure mechanisms in the full battery system

Method used

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  • Lithium ion battery electrode cyclic attenuation mechanism evaluating method
  • Lithium ion battery electrode cyclic attenuation mechanism evaluating method
  • Lithium ion battery electrode cyclic attenuation mechanism evaluating method

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Effect test

Embodiment 1

[0042] An evaluation method of a lithium-ion battery electrode cycle decay mechanism, using a symmetrical battery cycle test method, comprising the following steps:

[0043] S1: Select the same batch of battery positive pole pieces and negative pole pieces coated on one side, and assemble the positive pole pieces, negative pole pieces and electrolyte into multiple sets of single-layer soft-pack full batteries;

[0044] S2: After standing still for 12 hours, carry out the formation, full charge and empty test of the two batteries on the Xinwei testing cabinet according to the following two steps;

[0045] Step 1 (formation and full charge test): (1) Charge at 0.05C to 4.2V; (2) Leave for 5 minutes; (3) Discharge at 0.05C for 3V; (4) Leave for 5 minutes; (5) Charge at 0.1C to 4.2V; (6) Shelve for 5min; (7) Discharge at 0.1C to 3V; (8) Shelve for 5min; (9) Cycle from step (5) for 2 weeks; (10) Charge at 0.05C constant current and constant voltage to 4.2 V, cut-off current 0.01C....

Embodiment 2

[0054] An evaluation method of a lithium-ion battery electrode cycle decay mechanism, using a symmetrical battery cycle test method, comprising the following steps:

[0055] S1: Select the same batch of battery positive pole pieces and negative pole pieces coated on one side, and assemble the positive pole pieces, negative pole pieces and electrolyte into multiple sets of single-layer soft-pack full batteries;

[0056] S2: After standing still for 12 hours, carry out the formation, full charge and empty test of the two batteries on the Xinwei testing cabinet according to the following two steps;

[0057] Step 1 (formation and full charge test): (1) Charge at 0.05C to 4.2V; (2) Leave for 5 minutes; (3) Discharge at 0.05C for 3V; (4) Leave for 5 minutes; (5) Charge at 0.1C to 4.2V; (6) Shelve for 5min; (7) Discharge at 0.1C to 3V; (8) Shelve for 5min; (9) Cycle from step (5) for 2 weeks; (10) Charge at 0.05C constant current and constant voltage to 4.2 V, cut-off current 0.01C....

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Abstract

The invention relates to a lithium ion battery electrode cyclic attenuation mechanism evaluating method. With the method adopted, the technical problem that the various failure mechanisms of an integrated battery system are difficult to completely separate can be solved. According to the lithium ion battery electrode cyclic attenuation mechanism evaluating method, anode polar sheets, cathode polarsheets and electrolyte are assembled, so that a plurality of sets of single-layer soft-package integrated batteries can be formed; after formation is performed, empty electricity and full electricitytesting is performed; the anode polar sheets and the cathode polar sheets are taken out, and residual electrolyte is removed; and the anode polar sheets and the cathode polar sheets are assembled into soft-package laminated symmetrical batteries, and the attenuation mechanisms of the symmetrical batteries are cyclically tested and analyzed. A symmetrical battery system is adopted, the failure mechanisms of the anodes or and cathodes are separately studied, the generation of the side reactions of the anodes or cathodes is avoided, a test voltage range is narrow, and electrolyte oxidation is avoided. Compared with a half-battery system, the symmetrical battery system is limited in lithium transmission, and has no extra lithium (lithium sheet) participating in side reactions; compared with abutton-type symmetrical battery system, the soft-package symmetrical battery system ensures the sealing of a whole device and enables long-term cyclic testing.

Description

technical field [0001] The invention relates to the technical field of detection and characterization of lithium ion batteries, in particular to an evaluation method for the cycle decay mechanism of lithium ion battery electrodes. Background technique [0002] With the continuous development of human society, industries such as communications, national defense, aerospace, electronics, and automobiles have higher and higher demands on energy storage systems. Lithium-ion batteries have become a research hotspot because of their high energy density and long calendar life. At present, the failure analysis of lithium-ion batteries is mainly based on the electrical properties of the battery, but the research on the specific failure mechanism is very scarce. We can only study the battery decay mechanism synchronously with the normal use of the battery. The service life of lithium-ion batteries is 3-5 years, and the cycle life is more than 1000 times. It will take a lot of time to s...

Claims

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Application Information

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IPC IPC(8): G01R31/382G01R31/392
Inventor 王蓉蓉吴浩邵素霞吴欢欢代娟李丽娟姚丹
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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