Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6604015 | Electrochimica Acta | 2018 | 9 Pages |
Abstract
We present a novel and facile strategy to prepare porous N-doped carbon coated MnO (MnO@NC-Z) nanospheres through solvent-free in-situ growth of ZIF-8 on ZnMn2O4 followed by carbonization. The obtained MnO@NC-Z nanospheres are composed of numerous MnO nanoparticles that are uniformly coated by an ultrathin (â¼5â¯nm) and nitrogen-rich (â¼3.7â¯wt%) carbon layer derived from the in-situ grown ZIF-8 layer, which could not only restrict the volume expansion of MnO during the charge-discharge process but also substantially improve the electrical conductivity. Meanwhile, the synthesized MnO@NC-Z also possesses a high porosity and large specific surface area due to the porous structure of the ZIF-8 precursor and the evaporation of nano-sized Zn reduced from the ZIF-8 during the carbonization process, which could facilitate the fast transport of Li ions. As the anode in lithium-ion batteries (LIBs), the prepared MnO@NC-Z nanospheres deliver excellent performance with a high reversible capacity of 1261â¯mAâ¯hâ¯gâ1 at 0.2â¯Aâ¯gâ1, brilliant rate performance of 305â¯mAâ¯hâ¯gâ1 at a high rate of 5â¯Aâ¯gâ1, and excellent cycling stability for 1000 cycles at 1â¯Aâ¯gâ1 with a 96.5% capacity retention. Importantly, this solvent-free strategy of in-situ growth of ZIF-8 can also be extended to synthesize various metal oxides@carbon composites (e.g., FeOx@NC and CoOx@NC) for different applications such as energy storage and conversion.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Qingmeng Gan, Hanna He, Kuangmin Zhao, Zhen He, Suqin Liu,