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Lithium Trapping in Microbatteries Based on Lithium‐ and Cu 2 O‐Coated Copper Nanorods
Author(s) -
Rehnlund David,
Pettersson Jean,
Edström Kristina,
Nyholm Leif
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800281
Subject(s) - nanorod , lithium (medication) , electrode , materials science , copper , scanning electron microscope , current collector , trapping , electrochemistry , metal , chemical engineering , nanotechnology , analytical chemistry (journal) , metallurgy , composite material , chemistry , electrolyte , medicine , ecology , endocrinology , engineering , biology , chromatography
Microbatteries based on three‐dimensional (3D) electrodes composed of thin films of Li and Cu 2 O coated on Cu nanorod current collectors by electrodeposition and spontaneous oxidation, respectively, are described and characterised electrochemically. High‐resolution scanning electron microscopy (HR‐SEM) data indicate that the Li electrodeposition resulted in a homogenous coverage of the Cu nanorods and elemental analyses were also used to determine the amount of lithium in the Li‐coated electrodes. The results show that 3D Cu 2 O/Cu electrodes can be cycled versus 3D Li/Cu electrodes but that the capacity decreased during the cycling due to Li trapping in the Cu current collector of the 3D Li/Cu electrode. These findings highlight the problem of using copper current collectors together with metallic lithium as the formation of a solid solution yields considerable losses of electroactive lithium and hence capacity.