生物模板法制备MnO/C复合材料及其储锂性能研究

Biotemplate synthesis of MnO/C composite as high-performance anode for high lithium ion batteries

摘要:

以天然的柚子皮为生物模板，高锰酸钾为锰源，通过化学浴（CBD）方法和后续煅烧处理成功制备MnO/碳（MnO/C）复合材料。采用X射线衍射（XRD），热重-差热分析法（TG-DTA），拉曼（Raman），扫描电子显微镜（SEM）和透射电子显微镜（TEM）对材料的物相组成、形貌和微结构进行表征。结果表明柚子皮模板原位转变为碳基体，同时MnO颗粒均匀负载于碳基体形成MnO/C复合材料，其中碳含量约为30%。电化学测试表明该复合材料具有优异的储锂性能，在0.2 A/g电流密度下循环100次后可逆容量依旧保持在664 mAh/g，在3 A/g大电流密度下，可逆容量仍有441 mAh/g。

Abstract:

In this paper, MnO/carbon (MnO/C) composite was successfully synthesized by a facile biotemplating method combine with chemical bath deposition (CBD) method followed by calcination treatment. The natural pomelo peel and potassium permanganate were used as the biotemplate and potassium permanganate source. The phase composition, morphology and microstructure were investigated by XRD, TG-DTA, Raman, SEM and TEM, respectively. The result indicates that the pomelo peel was transformed to in-situ carbon matrix with a quality content of 30%, and MnO nanoparticles were uniformly dispersed onto the carbon matrix. The MnO/C composite presents excellent lithium-storage property, which exhibits a high reversible specific capacity of 644 mAh/g at a current density of 0.2 A/g after 100 cycles. Even at a high current density of 3 A/g, a remarkable reversible capacity of 430 mAh/g could still be maintained.