Journal
CHEMISTRYSELECT
Volume 3, Issue 8, Pages 2311-2314Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201800281
Keywords
Cu2O; Li; Li trapping; Microbattery; 3D
Categories
Funding
- Swedish Research Council [VR. 2012-4681, 2015-04421]
- Swedish Energy Agency (STEM)
- Angstrom Advanced Battery Center (AABC)
- StandUp for Energy
- Swedish Research Council [2015-04421] Funding Source: Swedish Research Council
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Microbatteries based on three-dimensional (3D) electrodes composed of thin films of Li and Cu2O 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 Cu2O/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.
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