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首页> 外文期刊>Advanced functional materials >Exceeding Theoretical Capacity in Exfoliated Ultrathin Manganese Ferrite Nanosheets via Galvanic Replacement- Derived Self-Hybridization for Fast Rechargeable Lithium-Ion Batteries
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Exceeding Theoretical Capacity in Exfoliated Ultrathin Manganese Ferrite Nanosheets via Galvanic Replacement- Derived Self-Hybridization for Fast Rechargeable Lithium-Ion Batteries

机译：Exceeding Theoretical Capacity in Exfoliated Ultrathin Manganese Ferrite Nanosheets via Galvanic Replacement- Derived Self-Hybridization for Fast Rechargeable Lithium-Ion Batteries

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Mixed transition metal oxides are promising anodes to meet highperformance energy storage materials; however, their widespread uses are restrained owing to limited theoretical capacity, restricted synthesis methods and templates, low conductivity, and extreme volume expansion. Here, Mn_(3-x)Fe_xO_4 nanosheets with interconnected conductive networks are synthesized via a novel self-hybridization approach of a facile, galvanic replacement-derived, tetraethyl orthosilicate-assisted hydrothermal process. An exceptionally high reversible capacity of 1492.9 mAh g~(?1) at 0.1 A g~(?1) is achieved by producing Li-rich phase through combined synergistic effects of amorphous phases with interface modification design for fully utilizing highly spin-polarized surface capacitance. Furthermore, it is demonstrated that large surface area can effectively facilitate Li-ion kinetics, and the formation of interconnected conductive networks improves the electrical conductivity and structural stability by alleviating volume expansion. This leads to a high rate capability of 412.3 mAh g~(?1) even at an extremely high current density of 10 A g~(?1) and stable cyclic stability with a capacity up to 921.9 mAh g?1 at 2 A g~(?1) after 500 cycles. This study can help to overcome theoretically limited electrochemical properties of conventional metal oxide materials, providing a new insight into the rational design with surface alteration to boost Li-ion storage capacity.

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