TY  - JOUR
AU  - Qian, Yunxian
AU  - Niehoff, Philip
AU  - Zhou, Dong
AU  - Adam, Robert
AU  - Mikhailova, Daria
AU  - Pyschik, Marcelina
AU  - Börner, Markus
AU  - Klöpsch, Richard
AU  - Rafaja, David
AU  - Schumacher, Gerhard
AU  - Ehrenberg, Helmut
AU  - Winter, Martin
AU  - Schappacher, Falko
TI  - Investigation of nano-sized Cu( ii )O as a high capacity conversion material for Li-metal cells and lithium-ion full cells
JO  - Journal of materials chemistry / A
VL  - 5
IS  - 14
SN  - 2050-7496
CY  - London [u.a.]
PB  - RSC
M1  - FZJ-2017-02784
SP  - 6556 - 6568
PY  - 2017
AB  - In this study, self-prepared nanostructured CuO electrodes show no capacity decay for 40 cycles at 0.1C in Li metal cells. The reaction mechanisms of the CuO electrodes are investigated. With the help of in situ EIS, in situ XRD, TEM, XAS, SQUID, IC and GC-MS, it is found that the as-prepared CuO electrode undergoes significant phase and composition changes during the initial lithiation, with the transformation of CuO to nano-crystalline Cu. During the 1st delithiation, Cu is inhomogeneously oxidized, which yields a mixture of Cu2O, Cu2−xO and Cu. The incomplete conversion reaction during the 1st cycle is accompanied by the formation and partial decomposition of the solid electrolyte interphase (SEI) as the side reactions. Nevertheless, from the 1st to the 5th delithiation, the oxidation state of Cu approaches +2. After an additional formation step, the transformation to Cu and back to Cu2−xO remains stable during the subsequent long-term cycling with no electrolyte decomposition products detected. The LiNi1/3Mn1/3Co1/3O2 (NMC-111)/CuO full cells show high capacities (655.8 ± 0.6, 618.6 ± 0.9 and 290 ± 2 mA h g−1 at 0.1, 1 and 10C, respectively), within the voltage range of 0.7–4.0 V at 20 °C and a high capacity retention (85% after 200 cycles at 1C).
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000398323400025
DO  - DOI:10.1039/C6TA10944F
UR  - https://juser.fz-juelich.de/record/828964
ER  -