Su Jing, Liang Hao, Gong Xian-Nian, Lv Xiao-Yan, Long Yun-Fei, Wen Yan-Xuan
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Nanning 530004, China.
Nanomaterials (Basel). 2017 May 26;7(6):121. doi: 10.3390/nano7060121.
Porous MnO/C microspheres have been successfully fabricated by a fast co-precipitation method in a T-shaped microchannel reactor. The structures, compositions, and electrochemical performances of the obtained MnO/C microspheres are characterized by X-ray diffraction, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller analysis, charge-discharge testing, cyclic voltammograms, and electrochemical impedance spectra. Experimental results reveal that the as-prepared MnO/C, with a specific surface area of 96.66 m²·g and average pore size of 24.37 nm, exhibits excellent electrochemical performance, with a discharge capacity of 655.4 mAh·g after cycling 50 times at 1 C and capacities of 808.3, 743.7, 642.6, 450.1, and 803.1 mAh·g at 0.2, 0.5, 1, 2, and 0.2 C, respectively. Moreover, the controlled method of using a microchannel reactor, which can produce larger specific surface area porous MnO/C with improved cycling performance by shortening lithium-ion diffusion distances, can be easily applied in real production on a large scale.
通过在T形微通道反应器中采用快速共沉淀法成功制备了多孔MnO/C微球。采用X射线衍射、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（HRTEM）、布鲁诺尔-埃米特-泰勒分析、充放电测试、循环伏安图和电化学阻抗谱对所得MnO/C微球的结构、组成和电化学性能进行了表征。实验结果表明，所制备的MnO/C比表面积为96.66 m²·g，平均孔径为24.37 nm，表现出优异的电化学性能，在1 C下循环50次后的放电容量为655.4 mAh·g，在0.2、0.5、1、2和0.2 C下的容量分别为808.3、743.7、642.6、450.1和803.1 mAh·g。此外，使用微通道反应器的控制方法可以通过缩短锂离子扩散距离来制备具有更大比表面积且循环性能得到改善的多孔MnO/C，并且可以很容易地应用于大规模实际生产中。
