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Method for characterizing SEI membrane impedance by optimizing proportion of conductive agent and binder
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A binder and conductive agent technology, applied in the field of detection and characterization of lithium-ion batteries
Active Publication Date: 2021-07-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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[0004] The technical problem to be solved by the present invention is to solve the problem that the battery impedance test of the traditional formula ratio can only obtain the semicircle in the high frequency region where the SEI film impedance and the electronic conductance impedance overlap, the semicircle in the low frequency region related to the charge transfer process, and the polarity related to solid phase diffusion. The problem with the slash in the low frequency area
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Embodiment 1
[0033] A method of optimizing a conductive agent and a binder ratio characterization SEI membrane impedance, comprising the steps of:
[0034] (1) After mixing the negative electrodegraphite, PVDF, and SP at 80:10:10, it is then treated with a slurry, coating, baking, and roll compression process, resulting in a 100% SOC negative electrode sheet; wherein the propellant The coating, baking and rolling process is: the time in the sealing machine is 30 min, and the thickness coated on the coater is 200 μm, and the coating is baked in an oven in 100 ° C for 3 h, then The roller press is performed on the roller press, the thickness of the roller is 30 μm, and the 100% SOC negative electrode sheet obtained after the roller is baked 24h is stored in the glove box;
[0035] (2) In a dry room (dew point ≤ -40 ° C), the 100% SOC negative electrode plate obtained in step (1) is cut into a plurality of plates of 4.2cm * width 5.3cm, and then The 100 μm thick lithium copper composite tangent ...
Embodiment 2
[0042] A method of optimizing a conductive agent and a binder ratio characterization SEI membrane impedance, comprising the steps of:
[0043] (1) After mixing the negative electrode graphite, PVDF, and SP at a ratio of 87.5: 10: 2.5, then after sequing, coating, baking, and rolling process is treated with a 100% SOC negative electrode sheet; wherein the gel The coating, baking and rolling process is: the time in the sealing machine is 30 min, and the thickness coated on the coater is 200 μm, and the coating is baked in an oven in 100 ° C for 3 h, then The roller press is performed on the roller press, the thickness of the roller is 30 μm, and the 100% SOC negative electrode sheet obtained after the roller is baked 24h is stored in the glove box;
[0044] (2) In a dry room (dew point ≤ -40 ° C), the 100% SOC negative electrode plate obtained in step (1) is cut into a plurality of plates of 4.2cm * width 5.3cm, and then The 100 μm thick lithium copper composite tangent is 4.5 cm * ...
Embodiment 3
[0051] A method of optimizing a conductive agent and a binder ratio characterization SEI membrane impedance, comprising the steps of:
[0052] (1) After mixing the negative electrode graphite, PVDF, and SP at a ratio of 87.5: 2.5: 10, then obtain 100% SOC negative electrode sheet after septal, coating, baking, and rolling process; wherein the proprings The coating, baking and rolling process is: the time in the sealing machine is 30 min, and the thickness coated on the coater is 200 μm, and the coating is baked in an oven in 100 ° C for 3 h, then The roller press is performed on the roller press, the thickness of the roller is 30 μm, and the 100% SOC negative electrode sheet obtained after the roller is baked 24h is stored in the glove box;
[0053] (2) In a dry room (dew point ≤ -40 ° C), the 100% SOC negative electrode plate obtained in step (1) is cut into a plurality of plates of 4.2cm * width 5.3cm, and then The 100 μm thick lithium copper composite tangent is 4.5 cm * width ...
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Abstract
The invention discloses a method for characterizing SEI (solidelectrolyte interface) membrane impedance by optimizing the proportion of a conductive agent and a binder, relates to the technical field of lithiumion battery detection characterization, and aims to solve the problem that only a high-frequency region semicircle with overlapped SEI membrane impedance and electronic conductive impedance, a low-frequency region semicircle related to the charge transfer process and an extremely-low-frequency region oblique line related to solid-phase diffusion can be obtained by a battery impedance test based on a traditional formula proportion . According to the invention, the proportion of the conductive agent and the binder is optimized, specifically, the content of the conductive agent and the binder in an electrode needs to be increased, and a battery capable of distinguishing a semicircle related to SEI film impedance from a semicircle of electronic conductive impedance related to a lithiumion de-intercalation process is prepared; the problem that only a high-frequency region semicircle overlapped with SEI film impedance and electronic conductance impedance, a low-frequency region semicircle related to a charge transfer process and an extremely low-frequency region oblique line related to solid-phase diffusion can be obtained through a battery impedance test according to a traditional formula proportion is solved.
Description
Technical field [0001] The present invention relates to the characterization of lithiumion battery detection characterization, and more particularly, a method of optimizing a conductive agent and a binder ratio characterization of SEI membrane impedance. Background technique [0002] Lithium-ion batteries are widely used in energy storage, power vehicles, ships and other fields due to their long-circulating life, high energy density, green energy without pollution. However, the battery has a decrease in capacity after long cycle and working, mainly related to the polarization of the battery during long cycle. Therefore, it is necessary to study the causes of polarization of lithium-ion battery to be avoided to avoid or reduce the occurrence of battery polarization. To achieve research on battery polarization, various research methods must be developed and applied, and electrochemical imperctionance spectroscopy, EIS is one of the most powerful tools for studying battery polariza...
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