标题： Low-Temperature Assembly of Ultrathin Amorphous MnO2 Nanosheets over Fe2O3 Spindles for Enhanced Lithium Storage

作者：Zeng, C (Zeng, Chen); Weng, W (Weng, Wei); Lv, T (Lv, Teng); Xiao, W (Xiao, Wei)来源出版物：ACS APPLIED MATERIALS & INTERFACES卷：10期：36页码: 30470-30478 DOI：10.1021/acsami.8b11794出版年：SEP 12 2018

摘要：Carbon coating is an effective method to enhance the lithium storage of metal oxides, which, however, suffers from harsh conditions in high-temperature hydrolysis of organic mass at inert atmosphere and compromised capacity due to the presence of low capacity carbon. We herein report a direct assembly of ultrathin amorphous MnO2 nanosheets with thickness less than 3 nm over Fe2O3 nanospindle backbones at 95 degrees C as a mild-condition, short process, and upscalable alternative to the classic carbon-coating method. The assembly of the amorphous MnO2 nanosheets significantly increases the electrical conductivity of Fe2O3 nano spindles. When evaluated as an anode for lithium-ion batteries, the Fe2O3@amorphous MnO2 electrode shows enhanced capacity retention compared to that of the Fe2O3 nanospindle electrode. In situ transmission electron microscopy and in situ X-ray diffraction observations of the electrochemically driven lithiation/delithiation of the Fe2O3@amorphous MnO2 electrode indicate that the assembled amorphous MnO2 nanosheets are in situ transformed into a Fe-Mn-O protection layer for better electrical conductivity, uncompromised Li+ penetration, and enhanced structural integration. The Fe2O3@amorphous MnO2 electrode therefore has a reversible capacity of 555 mAh g(-1) after 100 galvanostatic charge/discharge cycles at 1000 mA g(-1), comparable with that of the Fe3O4@C electrode derived via the classic carbon-coating route.

入藏号：WOS:000444793000051

文献类型：Article

语种：English

作者关键词：lithium-ion battery; anode; Fe2O3; MnO2; in situ transmission electron microscope; in situ X-ray diffraction

通讯作者地址：Xiao, W (reprint author), Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

电子邮件地址：gabrielxiao@whu.edu.cn

地址：[Zeng, Chen; Weng, Wei; Lv, Teng; Xiao, Wei] Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

影响因子：8.097