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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Problems solved by technology

[0004] An evaluation method for the cycle decay mechanism of lithium-ion battery electrodes proposed by the present invention can

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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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[0041] Example 1:

[0042] A method for evaluating the cycle attenuation mechanism of lithium-ion battery electrodes adopts a symmetric battery cycle test method and includes the following steps:

[0043] S1: selecting the same batch of battery positive pole pieces and negative pole pieces coated on one side, and assembling the positive pole pieces, negative pole pieces and electrolyte into multiple groups of single-layer soft-packed full batteries;

[0044] S2: After standing for 12 hours, the two batteries are subjected to formation and full and empty tests on the Xinwei test cabinet according to the following two steps;

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

Example Embodiment

[0053] Example 2

[0054] A method for evaluating the cycle attenuation mechanism of lithium-ion battery electrodes adopts a symmetric battery cycle test method and includes the following steps:

[0055] S1: selecting the same batch of battery positive pole pieces and negative pole pieces coated on one side, and assembling the positive pole pieces, negative pole pieces and electrolyte into multiple groups of single-layer soft-packed full batteries;

[0056] S2: After standing for 12 hours, the two batteries are subjected to formation and full and empty tests on the Xinwei test cabinet according to the following two steps;

[0057] Step 1 (formation and full power test): (1) 0.05C charge to 4.2V; (2) leave for 5min; (3) 0.05C discharge to 3V; (4) leave for 5 min; (5) 0.1C charge to 4.2V; (6) Leave for 5min; (7) Discharge at 0.1C to 3V; (8) Leave for 5min; (9) Circulate for 2 weeks from step (5); (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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