Path Dependent Battery Degradation Dataset 1

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 4200 (cycling and reference performance tests) and Biologic MPG205 (EIS)
Environmental chamber: Binder & Maccor thermal chamber, environmental temperature: 24 degC
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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, as well as the corresponding paper : "Investigation of Path Dependent Degradation in Lithium-Ion Batteries", Batteries & Supercaps (Wiley), Trishna Raj, Andrew A. Wang, Charles W. Monroe and David A. Howey 

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)

Thanks for your interest in our work.
David Howey 
Trishna Raj
Aug 2020
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The dataset contains 4 groups of long term degradation data collected for three 18650 NCA cells per each group, EIS data and half cell data.All datafiles include time, current, voltage, capacity and temperature data. All tests were conducted in a thermal chamber set to 24 degC.

File name format: TPGx.y - Cell z   (x: group number, y:file number , z: cell number)
Description of combined profile groups:
	Group 1 - 1 day of cycling at C/2 and 5 days of calendar aging at 90% SoC
	Group 2 - 1 day of cycling at C/4 and 5 days of calendar aging at 90% SoC 
	Group 3 - 2 days of cycling at C/2 and 10 days of calendar aging at 90% SoC
	Group 4 - 2 days of cycling at C/4 and 10 days of calendar aging at 90% SoC

Reference performance tests were conducted every 48 cycles and consist of 
	CC-CV discharge at C/2 to 2.5V (step 4)
	CC-CV charge at C/2 to 4.2V until current was C/60 (step 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, 16 and 18)
	Pulse characterisation at 50% SoC (steps 22, 24 and 26)
	Pulse characterisation at 20% SoC (steps 30, 32 and 34)

EIS data was collected at BoL and MoL  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.
Half cell data was collected by constructing half cells from harvested electrode material from a pristine 18650 and conducting a pseudo OCV test at C/24.

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) 2020, The Chancellor, Masters and Scholars of the University of Oxford, and the 'Path Dependent Battery Degradation Dataset 1' researchers. All rights reserved.
	
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