Path Dependent Battery Degradation Dataset 3

Recorded by: Trishna Raj, trishna.raj@eng.ox.ac.uk
Supervisor: David A. Howey, david.howey@eng.ox.ac.uk
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Place of tests: Battery Intelligence Lab, University of Oxford
Website: http://howey.eng.ox.ac.uk
Test subjects: 12 x NCR18650BD (nickel cobalt aluminium oxide (NCA) positive electrodes and graphite negative electrodes), 3Ah
Battery tester: Maccor 4000 (cycling and reference performance tests) and Biologic MPG205 (EIS)


Related Material : 
	Path Dependent Battery Degradation Dataset 1, https://doi.org/10.5287/bodleian:v0ervBv6p
	Path Dependent Battery Degradation Dataset 2, https://doi.org/10.5287/bodleian:2zvyknyRg
	"Investigation of Path Dependent Degradation in Lithium-Ion Batteries", Batteries & Supercaps (Wiley), Trishna Raj, Andrew A. Wang, Charles W. Monroe and David A. Howey 

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PLEASE READ THE FOLLOWING MESSAGE CAREFULLY BEFORE PROCEEDING FURTHER:
If you make use of our data, please cite our dataset directly using its DOI.
The data are stored in ".mat" files, which is the Matlab binary file format. You need Matlab, available from Mathworks, to open this type of file.
NOTE: The zip data files are large (approx. 0.8GB)

For raw data files in excel/MIMS client friendly formats with extended testing information, please contact david.howey@eng.ox.ac.uk 

Thanks for your interest in our work.
Trishna Raj
David Howey 
March 2021
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The dataset contains 4 groups of long term degradation data collected for three 18650 NCA cells per each group and EIS data. All datafiles include time, current, voltage, capacity and temperature data. 
File name format: TPGx.y - Cell z   (x: group number, y:file number , z: cell number)

Description of combined profile groups:
	Group 7 - 1 day of CCCV cycling at C/2 and 5 days of calendar aging at 90% SoC
	Group 8 - 2 days of CCCV cycling at C/2 and 10 days of calendar aging at 90% SoC 
	Group 9 - 1 day of CCCV cycling at C/2 and 5 days of calendar aging at 4.2V
	Group 10 -2 days of CCCV cycling at C/2 and 10 days of calendar aging at 4.2V

Reference performance tests were conducted every 48 cycles and consist of 
	CC discharge at C/2 to 2.5V (step 4)
	CC-CV charge at C/2 to 4.2V until current was C/60 (step 5, 6)
	Pseudo OCV discharge at C/24 to 2.5V (step 8)
	Pseudo OCV charge at C/24 to 4.2V (step 10)
	Pulse characterisation at 80% SoC (steps 14 and 16 )
	Pulse characterisation at 50% SoC (steps 20 and 22 )
	Pulse characterisation at 20% SoC (steps 26 and 28)

EIS data was collected at the beginning of life and end of life at 80%, 50% and 20% SoC. EIS was conducted with a 100 mA peak-to-peak excitation amplitude in the frequency range of 5 kHz to 10 mHz, with a resolution of 6 points per decade.

The first 3-4 files in groups 7,8 and 9 (TPGx.0-TPGx.3) do not have temperature data.

The additional document 'Guide to Datafiles' will help in identifying cycling and reference performance test data for each cell under test.
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These data are copyright (c) 2021, The Chancellor, Masters and Scholars of the University of Oxford, and the 'Path Dependent Battery Degradation Dataset 3' researchers. All rights reserved.
	
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