Unknown

Dataset Information

0

New insights into the electrochemical performance of precursor derived Si(Nb)OC composites as anode materials for batteries.


ABSTRACT: This work represents a first attempt to synthesize Si(Nb)OC ceramic composites through the polymer pyrolysis or the precursor-derived ceramics (PDC) route for use as a hybrid anode material for lithium-ion batteries (LIB). Electron microscopy, X-ray diffraction, and various spectroscopy techniques were used to examine the micro/nano structural features and phase evolution during cross-linking, pyrolysis, and annealing stages. During the polymer-to-ceramic transformation process, in situ formation of carbon (so-called "free carbon"), and crystallization of t-NbO2, NbC phases in the amorphous Si(Nb)OC ceramic matrix are identified. The first-cycle reversible capacities of 431 mA h g-1 and 256 mA h g-1 for the as-pyrolyzed and annealed Si(Nb)OC electrodes, respectively, exceeded the theoretical Li capacity of niobium pentaoxide or m-Nb2O5 (at approximately 220 mA h g-1). With an average reversible capacity of 200 mA h g-1 and close to 100% cycling efficiency, as-pyrolyzed Si(Nb)OC demonstrates good rate capability. X-ray amorphous SiOC with uniformly distributed nanosized Nb2O5 and graphitic carbon structure likely provides stability during repeated Li+ cycling and the formation of a stable secondary electrolyte interphase (SEI) layer, leading to high efficiency.

SUBMITTER: Vendra SSL 

PROVIDER: S-EPMC10508105 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

altmetric image

Publications

New insights into the electrochemical performance of precursor derived Si(Nb)OC composites as anode materials for batteries.

Vendra S S Lokesh SSL   Singh Gurpreet G   Kumar Ravi R  

RSC advances 20230919 40


This work represents a first attempt to synthesize Si(Nb)OC ceramic composites through the polymer pyrolysis or the precursor-derived ceramics (PDC) route for use as a hybrid anode material for lithium-ion batteries (LIB). Electron microscopy, X-ray diffraction, and various spectroscopy techniques were used to examine the micro/nano structural features and phase evolution during cross-linking, pyrolysis, and annealing stages. During the polymer-to-ceramic transformation process, <i>in situ</i> f  ...[more]

Similar Datasets

| S-EPMC8469060 | biostudies-literature
| S-EPMC11013368 | biostudies-literature
| S-EPMC6889125 | biostudies-literature
| S-EPMC11259886 | biostudies-literature
| S-EPMC5554059 | biostudies-literature
| S-EPMC5618363 | biostudies-literature
| S-EPMC9844252 | biostudies-literature
| S-EPMC6761877 | biostudies-literature
| S-EPMC10650621 | biostudies-literature
| S-EPMC5506961 | biostudies-other