Nitrogen-Doped Carbon Nanocages as High-Rate Anode for Lithium Ion Batteries
Received date: 2015-04-28
Online published: 2015-07-23
Supported by
Project supported by the National Natural Science Foundation of China (Nos. 21473089, 51232003, 21373108, 21173115, 21203092), “973” programs (No. 2013CB932902), Suzhou Program (No. ZXG2013025) and Changzhou Technology Support Program (No. CE20130032).
The specific power or rate capability of lithium-ion batteries (LIBs) today is insufficient for electric vehicles requiring fast charging and high power output. Compared with great progresses in the high-rate cathodes of LIBs, the development of matchable high-rate anodes still becomes a huge challenge. Carbonaceous materials have been widely used as the anodes of commercial LIBs due to the good conductivity, low cost and environmental friendliness. The nanostructured carbon materials could achieve the high surface area for electrolyte penetration and the short solid-state ion diffusion length for rapid ion transport. Moreover, carbon nanomaterials avoid the large volume change during lithiation/delithiation, which is grave problem for the other high capacity anode materials including Si-based materials and metal oxides. In addition, heteroatom-doping can provide further space for the optimization of lithium storage performance. Herein, we reported the nitrogen-doped carbon nanocages (NCNC) as high-performance anode materials for lithium ion batteries, prepared by an in-situ generated magnesium oxide template method (from decomposition of basic magnesium carbonate) and pyridine as carbon source at growth temperatures of 700, 800, and 900 ℃. The morphology, structure, and electrochemical performances were investigated by transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption/desorption equipment, and constant current discharge/charge tests. For example, NCNC800, prepared at 800 ℃, has a high specific surface area (1197 m2·g-1), high nitrogen content (8.2 at%), good conductivity (46 S·m-1) and mesopores structure. As an anode material for LIBs, NCNC800 delivers a steady charge capacity of ca. 900 mAh·g-1 at a low current density of 0.1 A·g-1 after 20 cycles activation, and stabilizes at ca. 135 mAh·g-1 even over 500 cycles at a high rate of 20.0 A·g-1, which are superior to graphene and graphite. These good electrochemical performances, such as high steady charge capacity, high-rate capability and excellent cyclability, can be ascribed to the unique structure of NCNC, which is beneficial to the electrolyte penetration, Li-ion diffusion, electron conduction, and structural stability during lithium ions intercalation/deintercalation. This unique carbon nanomaterial provides a new alternative of anode materials for high-performance LIBs.
Lyu Zhiyang , Feng Rui , Zhao Jin , Fan Hao , Xu Dan , Wu Qiang , Yang Lijun , Chen Qiang , Wang Xizhang , Hu Zheng . Nitrogen-Doped Carbon Nanocages as High-Rate Anode for Lithium Ion Batteries[J]. Acta Chimica Sinica, 2015 , 73(10) : 1013 -1017 . DOI: 10.6023/A15040289
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