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World Scientific Publishing, Functional Materials Letters, 2024

DOI: 10.1142/s1793604724510172

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

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Silicon oxides (SiO[Formula: see text], 0 < [Formula: see text] < 2)-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 SiO[Formula: see text] anodes, especially the severe volume expansion and the inferior Li[Formula: see text] kinetic properties, greatly limit their industrial promotion. Herein, we synthesized a dual-shell coating structural composite (denoted as SiO[Formula: see text]@Ni-MOF@C) through a two-step process. The unique structure effectively mitigates the huge volume variation of SiO[Formula: see text], which leads to unstable material interfaces and inferior Li[Formula: see text] kinetic characteristics. The as-prepared SiO[Formula: see text]@Ni-MOF@C composite demonstrates an initial charge capacity of 799.2 mAh g[Formula: see text] with an initial Coulombic efficiency (ICE) of 63.2%, and 515.6 mAh g[Formula: see text] with a capacity retention of 78.3% after 450 cycles at 1 A g[Formula: see text]. The dual-shell coating design can provide novel insights into other high-capacity anode materials suffering from large volume variations.