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.

Inactive Publication Date: 2019-12-13
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in order to solve the deficiency in the prior art that lithium dendrites cannot be quickly predicte

Method used

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  • Method for prejudging generation of lithium dendrites by decommissioned battery based on change of SEI film impedance
  • Method for prejudging generation of lithium dendrites by decommissioned battery based on change of SEI film impedance
  • Method for prejudging generation of lithium dendrites by decommissioned battery based on change of SEI film impedance

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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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Abstract

The invention relates to a method for prejudging the generation of lithium dendrites by a decommissioned battery based on the change of SEI film impedance. The method mainly comprises the following steps of establishing an electrochemical impedance equivalent circuit and an impedance spectrum model of a lithium battery; testing and analyzing relationships between the SEI film impedance and the number of cycles of the battery under different conditions; and prejudging the generation of the lithium dendrites by the decommissioned battery through the abnormal change of the SEI impedance. According to the method for prejudging the generation of the lithium dendrites by the decommissioned battery based on the change of the SEI film impedance, the electrochemical impedance equivalent circuit ofthe lithium ion battery comprising the SEI film impedance RSEI is established, and a relationship curve between the SEI film impedance and the cycle performance of the battery is established; by the corner feature that the SEI film impedance is reduced firstly and then is increased, the generation of the lithium dendrites by the decommissioned battery is quickly prejudged; and the method has the characteristics of simple process, high efficiency, accurate judgment result and the like.

Description

technical field [0001] The present application belongs to the technical field of lithium-ion batteries, and in particular relates to a method for predicting the generation of lithium dendrites in decommissioned batteries based on the change of SEI film impedance. Background technique [0002] The charging and discharging process of a battery is a complex electrochemical process, and there is not a single factor that leads to battery capacity fading, and the deterioration of one aspect may cause other factors to jointly affect the battery's capacity, cycle performance, energy density, etc. [0003] Starting from the material itself, both positive and negative electrode materials have a volume effect in the process of lithium intercalation and deintercalation, and the charge and discharge process of some positive electrode materials is accompanied by phase transition changes, which may lead to material structure rupture during long-term cycles. Deintercalation of lithium ions ...

Claims

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Application Information

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IPC IPC(8): G01R31/378G01R31/385G01R31/389G01R31/392
CPCG01R31/378G01R31/385G01R31/389G01R31/392
Inventor 赵光金王放放董锐锋
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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