The formation of yolk-shell structured NiO nanospheres with enhanced lithium storage capacity

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Journal Article
Materials Chemistry Frontiers, 2019, 3 (8), pp. 1619 - 1625
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© 2019 the Partner Organisations. NiO has been widely applied as an anode material for lithium-ion batteries (LIBs), but the weak conductivity of NiO and serious volume expansion usually lead to poor cycling performance. Herein, we report the synthesis of well-crystallized yolk-shell structured NiO nanospheres (NiO-30) through the direct pyrolysis of Ni coordination polymers (Ni-CPs). Compared to commercial NiO used for LIB anode materials with a capacity of 369 mA h g-1, the resultant yolk-shell structured NiO nanospheres (NiO-30) demonstrate twice the capacity of 733 mA h g-1 at the current density of 100 mA g-1. Furthermore, the cycling stability and rate capability of the NiO-30 samples are much better than those of the commercial NiO. The yolk-shell structures can improve the electronic conductivity, benefit the Li+ ion transport path and buffer the volume changes during the lithium-insertion-extraction processes, which results in high discharge capacity, and good cycling performance and rate capability.
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