Method for prejudging generation of lithium dendrites by decommissioned battery based on change of SEI film impedance
A technology of impedance change and lithium dendrite, which is applied in the field of prediction of lithium dendrites produced by retired batteries based on the impedance change of SEI film, which can solve the problems of rapid prediction of lithium dendrites produced by batteries that cannot be retired.
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Embodiment 1
[0034] This embodiment provides a method for predicting lithium dendrites produced by decommissioned batteries based on SEI film impedance changes, which includes the following steps:
[0035] S1: Taking the retired lithium iron phosphate battery as a sample, establish the resistance R including the SEI film SEI Lithium-ion battery electrochemical impedance equivalent circuit, test the normal charge state, 4.0V overcharge state, the number of battery cycles and R SEI Relationship;
[0036] S2: Taking the number of battery cycles as the X-axis, SEI film resistance R SEI As the Y axis, the number of battery cycles under different conditions is related to the SEI film resistance R SEI Establish a relationship curve, the SEI film resistance R in the relationship curve SEI The continuous increase trend is interrupted, and a curve segment that decreases and then increases appears, and the minimum value corresponding to the curve segment is the R that produces lithium dendrites. ...
Embodiment 2
[0041] This embodiment provides a method for predicting lithium dendrites produced by decommissioned batteries based on SEI film impedance changes, which includes the following steps:
[0042] S1: Taking the retired lithium iron phosphate battery as a sample, establish the resistance R including the SEI film SEI The electrochemical impedance equivalent circuit of the lithium-ion battery was used to test the relationship between the number of battery cycles and R under different normal charging conditions and overcharging conditions. SEI The relationship between different overcharge voltages includes 4.4V, 4.6V;
[0043] S2: Taking the number of battery cycles as the X-axis, SEI film resistance R SEI As the Y axis, the number of battery cycles under different conditions is related to the SEI film resistance R SEI Establish a relationship curve, the SEI film resistance R in the relationship curve SEI The continuous increase trend is interrupted, and a curve segment that decre...
Embodiment 3
[0047] This embodiment provides a method for predicting lithium dendrites produced by decommissioned batteries based on SEI film impedance changes, which includes the following steps:
[0048] S1: Still taking the retired lithium iron phosphate battery as the research sample, establish the electrochemical impedance equivalent circuit of the lithium-ion battery including the SEI film impedance RSEI; test the relationship between the number of battery cycles and the retired battery under four different positive and negative electrode ratio analysis conditions The SEI film resistance R SEI Relationship;
[0049] S2: Taking the number of battery cycles as the X-axis, SEI film resistance R SEI As the Y axis, the number of battery cycles under different conditions is related to the SEI film resistance R SEI Establish a relationship curve, the SEI film resistance R in the relationship curve SEI The continuous increase trend is interrupted, and a curve segment that decreases and th...
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