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Accurate prediction of the lifespan of lithium-ion batteries is crucial for ensuring the electrical safety of equipment. In the process of battery lifespan prediction, the selection of indirect parameters is a key link. However, at present, there are relatively few studies on the relationship between indirect parameters and the internal reaction mechanism of batteries. This paper conducts an experimental study on the relationship between indirect parameters in battery life prediction and the battery reaction mechanism, designs an integrated experimental scheme for battery charge and discharge cycles, electrochemical impedance and acoustic emission, and obtains the nonlinear evolution laws of capacity, impedance and mechanical damage with the number of cycles through experiments. By analyzing the evolution laws of charge transfer impedance (RCT) and solid-state electrolyte interface film impedance (RSEI), the mechanism by which RCT and RSEI affect the degradation of battery life by influencing the transmission and transfer of internal charges in the battery was discovered. Further, the intrinsic qualitative connection among battery capacity, impedance and damage was expounded. Subsequently, based on the qualitative connection between impedance and mechanical damage, the Pearson correlation coefficient was used to quantify the relationship between RCT, RSEI and the cumulative impact times of acoustic emission. The results show that the correlation coefficients of RCT and RSEI with the cumulative impact times of acoustic emission are both higher than 0.9, indicating that impedance is closely related to electrode mechanical damage. Impedance RCT and RSEI contain both electrochemical factors and electrode mechanical damage information. Moreover, the relationship between impedance and mechanical damage has been further verified through experiments with different charge and discharge rates and different electrode materials.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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