Method for non-destructive analysis of battery active material failure
A technology for the failure of active substances and materials, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of time-consuming and energy-consuming, cumbersome operation process, etc., and achieve the effect of great practical significance and convenient and targeted.
Inactive Publication Date: 2019-07-23
TIANJIN LISHEN BATTERY
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[0004] At present, in order to analyze and judge whether the capacity fading of the battery is caused by the failure of the positive active material or the negative active material, it is necessary to dissect the battery, and take the positive active material and the negative active material for test verification to confirm which active material Material failure, therefore, the specific operation process is cumbersome and requires a lot of time and effort
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[0065] For the method for non-destructive analysis of battery active material failures provided by the present invention, the upper three-electrode battery needs to be used for implementation,
[0066] One, make a three-electrode battery. The specific process is as follows:
[0067] 1. The production of the positive electrode sheet: the nickel-cobalt-aluminum NCA ternary material, conductive agent, polyvinylidene fluoride (PVDF glue), N-methylpyrrolidone (NMP) in a certain ratio (for example, the mass ratio is 66: 1.5: 2 :30.5) Mixing and stirring, then coating, rolling, and shearing to obtain a positive electrode sheet.
[0068] 2. Negative plate production: mix artificial graphite, sodium carboxymethyl cellulose (CMC), conductive agent, binder and deionized water in a certain proportion (for example, the mass ratio is 48:0.5:0.5:1:48) Stir, then coat, roll, and shear to obtain a negative electrode sheet.
[0069] 3. Three-electrode battery preparation: see figure 2 As shown, a th...
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The invention discloses a method for non-destructive analysis of battery active material failure. The method for non-destructive analysis of the battery active material failure comprises the followingsteps that firstly, capacity voltage differential curve characteristic peaks of a positive electrode and a negative electrode are separately collected by using a three-electrode battery; and secondly, the characteristic peaks separately representing the positive electrode and the negative electrode in the whole battery are identified through superposition of the characteristic peaks of the positive electrode and the negative electrode in the whole battery, and a characteristic peak database of the battery is established; and then through the change of the characteristic peaks of the positiveelectrode and the negative electrode in the capacity-voltage differential curve of the failed battery, the attenuation of the active substance can be determined through analysis and judgment. According to the method for non-destructive analysis of the battery active material failure, the reason of the capacity attenuation of the battery can be rapidly analyzed and judged without damaging the battery, whether the capacity attenuation of the battery is caused by the positive electrode active material failure or the negative electrode active material failure can be known, the improvement direction of the battery can be conveniently defined, targeted improvement in the next step can be facilitated, and great practical significance is achieved.
Description
Technical field [0001] The invention relates to the technical field of batteries and container parts with cathodes and anodes, in particular to a method for non-destructive analysis of battery active material failures. Background technique [0002] At present, as a new type of green energy, lithium-ion batteries have received more and more attention in recent years. With the expansion of the application range of lithium-ion batteries, the performance requirements of the batteries are becoming more and more stringent. The capacity retention rate of lithium-ion batteries is Everybody is very concerned about the characteristics of lithium-ion batteries. [0003] Battery capacity degradation is generally caused by the failure of active materials inside the battery. The active material in the battery includes a positive electrode active material and a negative electrode active material, and the battery capacity loss is generally mainly caused by the failure of the positive electrode ac...
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IPC IPC(8): G01R31/388G01R31/392
CPCG01R31/388G01R31/392
Inventor 郭纪郭立超孔令丽张志荣
Owner TIANJIN LISHEN BATTERY