| 高稳定性水系锌离子电池正极材料MnO2@MgO的制备与性能 | |
| Preparation and Performance of High Stability Cathode Material MnO2@MgO for Aqueous Zinc-Ion Battery | |
| 摘要: 采用共沉淀法和热分解法合成了具有核壳结构的MnO2@MgO微球。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）等手段对材料进行表征，结果发现包覆MgO不改变MnO2的结构，包覆层由纳米颗粒组成，厚度约为50 nm。电化学性能结果显示，包覆后材料的放电比容量明显提高，在100 mA·g-1电流密度下，最大放电比容量为274.3 mAh·g-1，比未包覆材料提高了12.8%。在1 000 mA·g-1电流密度下经过500次循环后，包覆后材料的放电比容量保持率高达84.1%，表现出优异的循环稳定性。MgO包覆层的存在避免了MnO2与电解液之间直接接触，抑制了电极材料在充放电过程中锰的溶解，从而显著提高MnO2的循环性能。 | |
| 关键词: 二氧化锰 共沉淀法 热分解法 包覆 水系锌离子电池 | |
| 基金项目: 国家自然科学基金（No.21975036）和中央高校基本科研业务费专项资金（No.3132019328）资助项目。 | |
| Abstract: MnO2@MgO core-shell microspheres were synthesized by coprecipitation method and pyrolytic process. The materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). It is found that MgO coating did not change the microstructure of MnO2, and the coating layer was composed of nanoparticles with a thickness of about 50 nm. As a result, electrochemical property showed that the discharge specific capacity of the coated material was obviously improved. The maximum discharge specific capacity was 274.3 mAh·g-1 at the current density of 100 mA·g-1, which was 12.8% higher than that of the uncoated material. Meanwhile, the coated material exhibited excellent cycle stability with 84.1% discharge specific capacity retention after 500 cycles at the current density of 1 000 mA·g-1. Obviously, the MgO coating layer prevents directly contact between MnO2 and electrolyte, and suppresses the dissolution of manganese during the charge and discharge process, thus significantly improves the cycle performance of MnO2. | |
| Keywords: manganese dioxide coprecipitation method pyrolytic process coating aqueous zinc-ion battery | |
| 投稿时间：2019-12-03 修订日期：2020-03-04 | |
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| 王志超,商洪静,郭广志,汤杰,李嵩,王昕宇,孙俊才.高稳定性水系锌离子电池正极材料MnO2@MgO的制备与性能[J].无机化学学报,2020,36(5):857-863. | |
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