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The effects of humidity on the self-discharge properties of Li(Ni1/3Co1/3Mn1/3)O-2/graphite and LiCoO2/graphite lithium-ion batteries during storage

Title
The effects of humidity on the self-discharge properties of Li(Ni1/3Co1/3Mn1/3)O-2/graphite and LiCoO2/graphite lithium-ion batteries during storage
Authors
Byun, Seoung WooPark, JoonamAppiah, Williams AgyeiRyou, Myung-HyunLee, Yong Min
DGIST Authors
Byun, Seoung Woo; Appiah, Williams Agyei; Lee, Yong Min
Issue Date
2017
Citation
RSC Advances, 7(18), 10915-10921
Type
Article
Article Type
Article
Keywords
AdditivesCalendar LifeCapacity FadeCapacity RetentionCarbonateelectric BatteriesCathode Active MaterialCellsDischarge CapacitiesElectrolyteElectrolytesExperimental ConditionsGrapheneHigh PowerHigh TemperatureHumid ConditionsImpedanceInitial Discharge CapacitiesIonsLiquid ElectrolytesLithiumLithium Ion BatteriesLithium AlloysLithium CompoundsManganeseMoleculesPerformanceRetention AbilitySemiconductor StorageStorage (Materials)
ISSN
2046-2069
Abstract
To investigate the effects of the exposure of battery tabs to humidity on the self-discharge properties of full-cell type lithium-ion batteries (LIBs), we assembled two different types of LIBs, composed of NCM/graphite or LCO/graphite, and compared their discharge retention abilities after storage in humid conditions (90% relative humidity (RH)) with and without battery tab protection. Regardless of the type of cathode active materials, tab protection improved the calendar lives of LIBs. For NCM/graphite, battery tab protection shows an approximate 50% improvement in the discharge capacity compared to the case without battery tab protection after storage in humid conditions (51.1% and 34.6% of the initial discharge capacity for tab-protected and non-protected LIBs, respectively). In contrast, LCO/graphite reveals a smaller change in the discharge capacity retention for the same experimental condition because they show superior capacity retention abilities regardless of battery tab protection (85.6% and 82.0% retention of the initial discharge capacity for tab-protected and non-protected LIBs, respectively). We suggested that these results come from the induction effect of polar water molecules, which pulls electrons to the battery tab side, resulting in lithium ion loss from the graphene layers to the liquid electrolyte. © The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/4732
DOI
10.1039/c6ra28516c
Publisher
Royal Society of Chemistry
Related Researcher
Files:
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Collection:
Energy Science and EngineeringETC1. Journal Articles


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