Journal
ELECTROCHIMICA ACTA
Volume 306, Issue -, Pages 143-150Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.129
Keywords
Porous; 3D interconnected; MnO/C aerogel; Controlled synthesis; Lithium ion batteries
Categories
Funding
- National Natural Science Foundation of China [51572014, 51272019]
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To improve electrochemical performance of MnO electrodes, the porous 3D interconnected MnO/C composite aerogel is, at first, fabricated through direct carbonization of polyacrylic acid (PAA)-assisted manganese-based aerogel. Herein, the influences of carbonization temperature and the amount of PAA on the microstructure and lithium storage performance of composites are presented. MnO/C composite aerogel n3-550 (carbothermal reduction at 550 degrees C with the 30 mmol addition of PAA) shows the minimal MnO crystalline size, and the MnO/C composite aerogel n3-650 (carbothermal reduction at 650 degrees C with the 30 mmol addition of PAA) has the largest surface area and highest porosity. When evaluated as anodes for lithium ion batteries, the composite n3-550 exhibits the highest reversible capacity of 1081.8 mAh g(-1) after 100 cycles at current density of 0.2 A g(-1), n3-650 electrode displays the most outstanding rate capability (601mAh g(-1) at 2 A g(-1)), and the highest coulombic efficiency (initial coulombic efficiency of 69.8% and greater than 98% after the 6th cycles). These excellent electrochemical performances are as a result of the porous interconnected 3D networks composited of hybridized nano-MnO with carbon, providing outstanding electrical conductivity and 3D charge transport channels. This facile and efficient strategy provides a horizon and deep understanding for advancing the design of high-performance oxide based anode materials. (c) 2019 Elsevier Ltd. All rights reserved.
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