Preparation of N-doped porous carbon coated MnO nanospheres through solvent-free in-situ growth of ZIF-8 on ZnMn2O4 for high-performance lithium-ion battery anodes
Preparation of N-doped porous carbon coated MnO nanospheres through solvent-free in-situ growth of ZIF-8 on ZnMn2O4 for high-performance lithium-ion battery anodes
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ZIF-8在ZnMn2O4上无溶剂原位生长制备氮掺杂多孔碳包覆MnO纳米球用于高性能锂离子电池负极
DOI：
10.1016/j.electacta.2018.02.010
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发表时间：
2018-03
影响因子：
6.6
通讯作者：
Suqin Liu
中科院分区：
文献类型：
--
作者：
Suqin Liu
我们提出了一种新的、简便的方法，通过在ZnMn2O4上无溶剂原位生长ZIF-8，然后碳化，制备出多孔的N掺杂碳包覆MnO(MnO@NC-Z)纳米球。所得到的MnO@NC-Z纳米球是由大量的MnO纳米粒子组成的，这些纳米粒子均匀地被来自原位生长的ZIF-8层的超薄(∼5 nm)和富氮(∼3.7 wt%)碳层覆盖，这不仅可以限制MnO在充放电过程中的体积膨胀，而且可以显著提高导电性。同时，由于ZIF-8前驱体的孔道结构以及ZIF-8在碳化过程中减少了纳米锌的蒸发，合成的MnO@NC-Z还具有高孔隙率和大的比表面积，这有利于锂离子的快速传输。制备的纳米MnO@NC-Z作为锂离子电池(LIB)的负极材料具有优异的性能，其可逆容量为1261 Ma h g−1(0.2 A g−1)，305 Ma h g−1(5 A g−1)的出色倍率性能，以及1 A g−1(1 A g−1)1000次循环的优异稳定性，容量保持率为96.5%。重要的是，这种无溶剂原位生长ZIF-8的策略也可以扩展到合成各种金属氧化物@碳复合材料(例如，FeOx@NC和CoOx@NC)，用于不同的应用，如能量存储和转换。
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 ZnMn2O4followed by carbonization. The obtained MnO@NC-Z nanospheres are composed of numerous MnO nanoparticles that are uniformly coated by an ultrathin (∼5 nm) and nitrogen-rich (∼3.7 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 1261 mA h g−1at 0.2 A g−1, brilliant rate performance of 305 mA h g−1at a high rate of 5 A g−1, and excellent cycling stability for 1000 cycles at 1 A g−1with 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.
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