Synergistic carbon coating of Ni-MOF on SiOx for high-performance lithium-ion batteries

Silicon oxides ([Formula: see text])-based anodes have been regarded as one of the most prospective candidate materials for lithium-ion batteries (LIBs) due to their high theoretical capacity. However, the inherent drawbacks of [Formula: see text] anodes, especially the severe volume expansion and the inferior [Formula: see text] kinetic properties, greatly limit their industrial promotion. Herein, we synthesized a dual-shell coating structural composite (denoted as [Formula: see text]@Ni-MOF@C) through a two-step process. The unique structure effectively mitigates the huge volume variation of [Formula: see text], which leads to unstable material interfaces and inferior [Formula: see text] kinetic characteristics. The as-prepared [Formula: see text]@Ni-MOF@C composite demonstrates an initial charge capacity of 799.2 mAh [Formula: see text] with an initial Coulombic efficiency (ICE) of 63.2%, and 515.6 mAh [Formula: see text] with a capacity retention of 78.3% after 450 cycles at 1 A [Formula: see text]. The dual-shell coating design can provide novel insights into other high-capacity anode materials suffering from large volume variations.