In
this work, metal–organic framework (MOF)-structured porous
ZnCo2O4/C composite nanofibers are prepared
by electrospinning, followed by in situ growth and annealing. The
ZnCo2O4/C nanofibers exhibit features such as
robust pores, high specific surface area (148.7 m2·g–1), and nanofiber structure, enabling excellent capacity
performance, cycle stability, and rate capabilities as anode in lithium-ion
batteries (LIBs). Briefly, specific discharge capacities of 1707 and
1145 mAh·g–1 are delivered for initial and
after 100 cycles, respectively, and even restraining a specific capacity
of 701 mAh·g–1 at 1.0 A·g–1. The excellent electrochemical properties of MOFs-ZnCo2O4/C composite nanofibers are mainly attributed to the
following reasons: (i) the abundant channels for lithium-ion intercalation/de-intercalation
offered by the MOF structure; (ii) the alleviated volume expansion
during the charge/discharge process owing to the intrinsic stability
of the one-dimensional (1D) fiber; and (iii) the carbon fiber with
excellent conductivity enables efficient conduction efficiency of
lithium ions and electrons. Capacity fading is significantly improved,
and the proposed strategy offers a perspective to improve electrochemical
performance in energy storage.
In this study, necklace-like NiCo2O4@carbon composite nanofibers (NCO@CNFs) anode hatched by metal-organic frameworks, featuring low volume expansion and superior high rate properties, are prepared for anode of lithium-ion batteries. By...
The zinc cobaltite possesses merit of high theoretical specific capacity. However, issues of low conductivity and volume expansion during lithiation and delithiation lead to severe capacity fading. In this work, a porous zinc cobaltite/carbon composite nanofiber is synthesized with a metal–organic frameworks (MOFs) structure through electrospinning, in situ growth, and hydrothermal reaction. The obtained zinc cobaltite/carbon composite nanofibers have an improved specific surface area (90.61 m2 g‐1), enabling excellent electrochemical performance as anode materials in Li‐ion batteries. Briefly, a high initial discharge capacity of 2468 mAh g‐1 and reversible capacity of 2008 mAh g‐1 after the 200 cycles, and an outstanding rate capability of 937 mAh g‐1 at 2 A g‐1 are achieved. The capacity fading of MOFs–zinc cobaltite/carbon composite nanofibers is significantly improved, which can be attributed to the following reasons: i) the MOFs structure effectively relieve the strain stemming from volume expansion of transition metal; ii) the abundance of mesoporous structure facilitates the electron transport for Li+ diffusion rate by shortening the Li‐ion diffusion path during lithiation/delithiation process; iii) the carbon nanofibers with excellent conductivity enable efficient conduction efficiency of lithium ions and electrons. The proposed strategy offers a new perspective to prepare high‐performance electrode for lithium‐ion batteries.
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