Method for representing lithium ion concentration change in electrolyte during cyclic process

A technology of cyclic process and concentration change, applied in the direction of measuring electrical variables, electrochemical generators, electrochemical variables of materials, etc., can solve problems such as fluctuations, lack of intuitive understanding, and limitations

Inactive Publication Date: 2018-09-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual charge and discharge process, subject to the charge and discharge rate, Li + Diffusion speed and other factors, Li will be generated between the positive and negative electrodes + concentration gradient, Li + Concentration fluctuates with charge and discharge
Limited by technical means, in the past, we lacked an intuitive understanding of the behavior of the electrolyte in the lithium-ion battery during the charging and discharging process. It was more like studying a black box. We put forward various theories and speculated on its behavior.

Method used

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  • Method for representing lithium ion concentration change in electrolyte during cyclic process
  • Method for representing lithium ion concentration change in electrolyte during cyclic process
  • Method for representing lithium ion concentration change in electrolyte during cyclic process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the lithium-ion battery includes a positive electrode sheet 1 and a negative electrode sheet 3, a double-layer separator 2 is provided between the positive electrode sheet 1 and the negative electrode sheet 3, and a first reference electrode 5 is provided between the double-layer separator 2; A single-layer separator 4 is arranged on the outside of the negative electrode sheet 3 , and a second reference electrode 6 is arranged on the outside of the single-layer separator 4 .

[0031] Both the first reference electrode 5 and the second reference electrode 6 are copper wires.

[0032] Such as figure 2 as shown in figure 1 As shown, the lithium-ion battery includes a positive electrode sheet 1 and a negative electrode sheet 3, a double-layer separator 2 is provided between the positive electrode sheet 1 and the negative electrode sheet 3, and a first reference electrode 5 is provided between the double-layer separator 2; A single-layer separa...

Embodiment 2

[0035] (1) Assemble according to the first structure in Example 1, and assemble the lithium ion battery with two reference electrodes in a dry room by injecting liquid into the seal;

[0036] (2) Put the two reference electrodes in the lithium-ion battery on the Xinwei channel battery comprehensive performance tester respectively, and respectively carry out the positive and negative pole pieces to pass through lithium for 240min under the current condition of 0.02mA; make the two reference electrodes (copper Silk) uniformly adhered to a layer of metal lithium on the surface;

[0037] (3) The lithium-ion battery after step (2) is processed into two weeks at a rate of 0.05C;

[0038] (4) Connect the lithium-ion battery after the above-mentioned formation to the Xinwei test workstation, set the constant current charge and discharge at 0.05C, 0.1C, 0.5C, and 1C for 2 weeks, and use a multi-channel recorder to monitor the negative electrodes respectively. Voltage E1, E2 to two ref...

Embodiment 3

[0042] (1) Assemble according to the first structure in Example 1, and assemble the lithium ion battery with two reference electrodes in a dry room by injecting liquid into the seal;

[0043] (2) Put the two reference electrodes in the lithium-ion battery on the Xinwei channel battery comprehensive performance tester respectively, and respectively carry out the positive and negative pole pieces to pass through lithium for 240min under the current condition of 0.02mA; make the two reference electrodes (copper Silk) uniformly adhered to a layer of metal lithium on the surface;

[0044] (3) The lithium-ion battery after step (2) is processed into two weeks at a rate of 0.05C;

[0045] (4) Connect the lithium-ion battery after the above-mentioned formation to Xinwei test workstation, set 0.05C constant current charge and discharge for 1 week, 0.1C, and 1C rate for 2 weeks, and monitor them separately with a multi-channel recorder The voltages E1 and E2 of the negative electrode t...

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Abstract

The invention discloses a method for representing the lithium ion concentration change in an electrolyte during a cyclic process. The method comprises the following steps of assembling a lithium ion battery with two reference electrodes; plating lithium on the two reference electrodes in the lithium ion battery through a Xinwei channel battery comprehensive performance tester; under the 0.05C multiplying power, forming the lithium ion battery processed through the step (2) for two circles; setting different multiplying power for circulating, and using a multi-channel recorder for monitoring anegative electrode plate to have voltages E1 and E2 on the two reference electrodes; calculating the lithium ion concentration change in the electrolyte during a charging and discharging process of the lithium ion battery according to a nernst equation. Therefore, the change situation of the electrolyte during the charging and discharging process and the disembedding behavior of the lithium ion between a positive electrode material and a negative electrode material are known, so that the aims of optimizing the battery performance and prolonging the cycle life are achieved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical characterization, and in particular relates to a method for characterizing the lithium ion concentration change in the electrolyte between positive and negative electrodes during charging and discharging. Background technique [0002] Ideally, there should be sufficient electrolyte between the positive and negative electrodes, and there should be enough Li in the process of charging and discharging. + Concentration, thereby reducing the performance degradation caused by the concentration polarization of the electrolyte. However, in the actual charge and discharge process, subject to the charge and discharge rate, Li + Diffusion speed and other factors, Li will be generated between the positive and negative electrodes + concentration gradient, Li + The concentration fluctuates with charge and discharge. Limited by technical means, in the past, we lacked an intuitive understanding of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30G01R31/36H01M10/48
CPCG01N27/26G01N27/30G01R31/36H01M10/484Y02E60/10
Inventor 代娟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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