AI Article Synopsis
- The study highlights the development of a carbon-coated MoC nanofiber (laser MoC@C) as an advanced anode material for lithium ion batteries, achieved through a laser carbonization process.
- The designed MoC@C shows impressive cycling stability, maintaining a capacity of 300 mA h g even after 3000 cycles, due to its highly graphitized carbon layer which enhances electron transport and prevents material degradation.
- Analysis reveals that Mo vacancies in MoC@C increase its efficiency for lithium storage, making it a more advantageous option compared to standard intact MoC materials, as confirmed by density functional theory calculations.
Article Abstract
Fast electron/ion transport and cycling stability of anode materials are key factors for achieving a high rate performance of battery materials. Herein, we successfully fabricated a carbon-coated MoC nanofiber (denoted as laser MoC@C) as the lithium ion battery anode material by laser carbonization of PAN-PMo (PAN = Polyacrylonitrile; PMo = HPMoO). The highly graphitized carbon layer in laser MoC@C effectively protects MoC from agglomeration and flaking while facilitating electron transfer. As such, the laser MoC@C electrode displays an excellent electrochemical stability under 5 A g, with a capacity up to 300 mA h g after 3000 cycles. Furthermore, the extended X-ray absorption fine structure results show the existence of some Mo vacancies in MoC@C. Density functional theory calculations further prove that such vacancies make the defective MoC@C composites energetically more favorable for lithium storage in comparison with the intact MoC.
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| http://dx.doi.org/10.1021/acsami.3c03663 | DOI Listing |
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