Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 18, Pages 9682-9688Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00701a
Keywords
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Funding
- National Natural Science Foundation of China [11374306, 11174292, 50972146, 10904144]
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Capacity fading caused by pulverization is the basic issue for transition-metal-oxide anodes in lithium-ion batteries (LIBs). Here we report a simple and scalable fabrication of core-shell structured gamma-Fe2O3@C nanoparticle based composites incorporated with multi-walled carbon nanotubes (MWNTs), through a vacuum-carbonization of the synthesized metal-organic complex and MWNT hybrids. In the constructed gamma-Fe2O3@C/MWNT architecture, the carbon shell layers can not only buffer the volume change of gamma-Fe2O3 nanoparticles but also improve their conductivity; while the flexible and conductive MWNT networks can maintain the structural and electrical integrity of the electrodes during the charge/discharge cycles. As a result, such gamma-Fe2O3@C/MWNT electrodes, tested as anodes for LIBs, exhibit excellent cycling performance with monotonically increased reversible capacities along with cycles. For instance, the specific capacity rises at a rate of similar to 6.8 mA h g(-1) per cycle to 1139 mA h g(-1) after 60 cycles at the current density of 100 mA g(-1). Such electrode activation was revealed to be closely related to the increased active surface area of the electrode arising from the gradual vesiculation in gamma-Fe2O3@C nanoparticles during lithiation/delithiation in the as-prepared robust gamma-Fe2O3@C/MWNT architecture.
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