Tuning the Morphologies of MnO/C Hybrids by Space Constraint Assembly of Mn-MOFs for High Performance Li Ion Batteries

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• 作者：Dan Sun ; Yougen Tang ; Delai Ye ; Jun YanHaoshen Zhou ; Haiyan Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：9
• 期：6
• 页码：5254-5262
• 全文大小：725K
• ISSN：1944-8252

文摘

Morphology controllable fabrication of electrode materials is of great significance but is still a major challenge for constructing advanced Li ion batteries. Herein, we propose a novel space constraint assembly approach to tune the morphology of Mn(terephthalic acid) (PTA)-MOF, in which benzonic acid was employed as a modulator to adjust the available MOF assembly directions. As a result, Mn(PTA)-MOFs with microquadrangulars, microflakes, and spindle-like microrods morphologies have been achieved. MnO/C hybrids with preserved morphologies were further obtained by self-sacrificial and thermal transformation of Mn(PTA)-MOFs. As anodes for Li ion batteries, these morphologies showed great influence on the electrochemical properties. Owing to the abundant porous structure and unique architecture, the MnO/C spindle-like microrods demonstrated superior electrochemical properties with a high reversible capacity of 1165 mAh g^–1 at 0.3 A g^–1, excellent rate capability of 580 mAh g^–1 at 3 A g^–1, and no considerable capacity loss after 200 cycles at 1 A g^–1. This strategy could be extended to engineering the morphology of other MOF-derived functional materials in various structure-dependent applications.