Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Mechanism exploration of enhanced electrochemical performance of single-crystal versus polycrystalline LiNi0.8Mn0.1Co0.1O2
Ist Teil von
Rare metals, 2022-11, Vol.41 (11), p.3783-3794
Ort / Verlag
Beijing: Nonferrous Metals Society of China
Erscheinungsjahr
2022
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Single-crystal LiNi
0.8
Mn
0.1
Co
0.1
O
2
(SC-811), which offers better cycle performance compared to the polycrystalline counterpart, has received great attention. We report herein the synthesis of SC-811 with a grain size of 2–4 μm by washing and reheating method, which compares with conventional polycrystalline LiNi
0.8
Co
0.1
Mn
0.1
O
2
(PC-811). The discharge capacity of SC-811 reaches 152.1 mAh·g
−1
after 100 cycles (86.7% capacity retention) at 1.0C, which is much better than that of PC-811 (130.2 mAh·g
−1
, 73.8% capacity retention). By using multiscale characterization, the results unveil that SC-811 can not only improve the reversibility of the H2-H3 phase transitions, suppress the generation of micro-cracks and phase transformations, but also mitigate the undesired side reactions between electrode and electrolyte. Besides, the Li–O bond of SC-811 is longer than that of PC-811, which is conducive to the de-intercalation of Li-ions, thereby enhancing the structural stability. This finding provides an impressive strategy to sustain structural stability and improve the cycling life of Ni-rich layered cathodes.
Graphical abstract