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Electrode activation via vesiculation: improved reversible capacity of γ-Fe2O3@C/MWNT composite anodes for lithium-ion batteries
| Content Provider | Semantic Scholar |
|---|---|
| Author | Liu, Yongfei Xu, Junmin Qin, Xiaoying Xin, Hongxing Yuan, Xueqin Zhang, Jian Song, Chunjun |
| Copyright Year | 2015 |
| Abstract | 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 γ-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 γ-Fe2O3@C/MWNT architecture, the carbon shell layers can not only buffer the volume change of γ-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 γ-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 ∼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 Fe2O3@C nanoparticles during lithiation/delithiation in the as-prepared robust γ-Fe2O3@C/MWNT architecture. |
| Starting Page | 9682 |
| Ending Page | 9688 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C5TA00701A |
| Volume Number | 3 |
| Alternate Webpage(s) | https://pubs.rsc.org/en/content/getauthorversionpdf/C5TA00701A |
| Alternate Webpage(s) | https://doi.org/10.1039/C5TA00701A |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
