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Alloying germanium nanowire anodes dramatically outperform graphite anodes in full-cell chemistries over a wide temperature range

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Show simple item record Collins, Gearoid A. McNamara, Karrina Kilian, Seamus Geaney, Hugh Ryan, Kevin M. 2021-08-25T11:42:27Z 2021-08-25T11:42:27Z 2021
dc.description peer-reviewed en_US
dc.description.abstract The electrochemical performance of Ge, an alloying anode in the form of directly grown nanowires (NWs), in Li-ion full cells (vs LiCoO2) was analyzed over a wide temperature range (−40 to 40 °C). LiCoO2||Ge cells in a standard electrolyte exhibited specific capacities 30× and 50× those of LiCoO2||C cells at −20 and −40 °C, respectively. We further show that propylene carbonate addition further improved the low-temperature perform ance of LiCoO2||Ge cells, achieving a specific capacity of 1091 mA h g−1 after 400 cycles when charged/discharged at −20 °C. At 40 °C, an additive mixture of ethyl methyl carbonate and lithium bis(oxalato)borate stabilized the capacity fade from 0.22 to 0.07% cycle−1 . Similar electrolyte additives in LiCoO2||C cells did not allow for any gains in performance. Interestingly, the capacity retention of LiCoO2||Ge improved at low temperatures due to delayed amorphization of crystalline NWs, suppressing complete lithiation and high-order Li15Ge4 phase formation. The results show that alloying anodes in suitably configured electrolytes can deliver high performance at the extremes of temperature ranges where electric vehicles operate, conditions that are currently not viable for commercial batteries without energy-inefficient temperature regulation. en_US
dc.language.iso eng en_US
dc.publisher American Chemical Society en_US
dc.relation.ispartofseries ACS Applied Energy Materials;4 (2), pp. 1793-1804
dc.subject germanium nanowire en_US
dc.subject graphite en_US
dc.subject lithium-ion battery en_US
dc.subject full cell en_US
dc.subject wide temperature performance en_US
dc.subject temperature-controlled electrochemical amorphization en_US
dc.title Alloying germanium nanowire anodes dramatically outperform graphite anodes in full-cell chemistries over a wide temperature range en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1021/acsaem.0c02928
dc.contributor.sponsor IRC en_US
dc.contributor.sponsor SFI en_US
dc.relation.projectid EPSPG/2017/ 233 en_US
dc.relation.projectid 18/SIRG/5484 en_US
dc.relation.projectid 16/IA/4629 en_US
dc.relation.projectid 16/M-ERA/3419 en_US
dc.relation.projectid IRCLA/ 2017/285 en_US
dc.relation.projectid 12/RC/2278_P2 en_US
dc.relation.projectid 12/RC/2302_P2 en_US
dc.relation.projectid 16/RC/ 3918 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2990913

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