How to perform the GITT Test with Neware battery tester？
In the electrochemical energy storage field, electron conduction and ion diffusion are crucial for the performance of the electrode materials.
Taking lithium-ion batteries,electrons are transmitted to the surface of the material through external circuit, and ions diffuse to the interior of the material through an internal circuit.
Finally, the active material, electrons, and ions undergo electrochemical reactions, achieving the mutual conversion between electrical and chemical energy.
The diffusion of ions inside a material refers to the phenomenon of ion transport from high concentration to low concentration, resulting in the homogenization of ion concentration inside the material. The physical parameter that characterizes the diffusion rate of ions is the ions diffusion coefficient.
Common testing methods include GITT, PITT, CV,EIS, CPR,PRT, ETC.
About GITT test, three options to make a judgment are available by Neware.
The first method is to make a judgment on the battery during the charging and discharging process;
The second method is to after the resting time is completely completed;
The third method is to after the charging and discharging time has completely run.
Today, I will share with you the 1th and 2nd on how to do a GITT test with Neware battery tester.
Taking a battery with 1mA for an example, charged to 4V and discharged to 2V.
The first method- make a judgment during the charging and discharging process;
Step1: Rest the cell for 30mins.
Step2: Charge the cell. Use 1mA and CC mode(Constant Current) to charge the cell up to 30 mins. Set “IF”?steps:
If the charging time ＜30 mins & charging voltage≥4V, then go the next step；
If the charging time ≥30 mins & charging voltage＜4V, then go back to step 1(continue to charge the cell to be sure it can reach its highest voltage).
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Step 3: Rest the cell for a long time. We’d suggest 10hs. Cause the longer time we wait, the more balance the diffusion of the Li+ we could possible get. ?
Here, we set up the resting period for 10 hours, which is completely longer enough.
Step 4: Discharge the cell. Use 1mA and CC mode(Constant Current) to discharge the cell up to 30 mins. Set “IF”?steps:
If the discharging time ＜30 mins & discharging voltage≤2V, then go to the finished；
If the discharging time ≥30 mins & discharging voltage＞2V, then go back to step 3(continue to discharge the cell).
Step5：End. The whole test is finished.
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The step procedures are showed in the following pic:
The second method- make a judgment after the resting time is completely completed;
Step1: Charge the cell. Use 1mA and CC mode(Constant Current) to charge the cell up to 30 mins.
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Step2: Rest the cell for 30mins. Set “IF”?steps:
If the charging voltage≥4V, then go the next step；
If the charging voltage＜4V, then go back to step 1(continue to charge the cell to be sure it can reach its highest voltage).
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Step 3: Discharge the cell. Use 1mA and CC mode(Constant Current) to discharge the cell up to 30 mins.
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Step 4: Rest the cell for 30mins. Set “IF”?steps:
If the discharging voltage≤2V, then go to the finished；
If the discharging voltage＞2V, then go back to step 3(continue to discharge the cell).
Step5：End. The whole test is finished.
The step procedures are showed in the following pic:
The third method- make a judgment after the charging and discharging time has completely run.
Step1: Rest the cell for 30mins.
Step2: Charge the cell. Use 1mA and CC mode(Constant Current) to charge the cell up to 30 mins. Set “IF”?steps:
If the charging voltage≥4V, then go the next step；
If the charging voltage＜4V, then go back to step 1.
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Step 3: ?Rest the cell for 30mins.
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Step 4: Discharge the cell. Use 1mA and CC mode(Constant Current) to discharge the cell up to 30 mins. Set “IF”?steps:
If the discharging voltage≤2V, then go to the finished；
If the discharging voltage＞2V, then go back to step 3.
Step5：End. The whole test is finished.
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The step procedures are showed in the following pic:
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After the test, as we can see from the plot/graph below（as a referenc）:
You can set it acording to your work step program, and the system operation is simple,
As?you can see, ?the whole test process is easy to understand, and to be more specific, all working steps can only be divided into three catalogs, which is charge, discharge and rest respectively.?
Thanks for your reading, if need anything, please contact me.
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