具有超高锂存储性能的碳包覆Co3O4纳米颗粒作为阳极材料

Carbon-Encapsulated Co3O4 Nanoparticles as Anode Materials with Super Lithium Storage Performance.

作者信息

Leng Xuning, Wei Sufeng, Jiang Zhonghao, Lian Jianshe, Wang Guoyong, Jiang Qing

机构信息

Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, PR China.

Key Laboratory of Advanced Structural Materials, Changchun University of Technology, No.2055 Yanan Street, Changchun 130012, PR China.

出版信息

Sci Rep. 2015 Nov 13;5:16629. doi: 10.1038/srep16629.

A high-performance anode material for lithium storage was successfully synthesized by glucose as carbon source and cobalt nitrate as Co3O4 precursor with the assistance of sodium chloride surface as a template to reduce the carbon sheet thickness. Ultrafine Co3O4 nanoparticles were homogeneously embedded in ultrathin porous graphitic carbon in this material. The carbon sheets, which have large specific surface area, high electronic conductivity, and outstanding mechanical flexibility, are very effective to keep the stability of Co3O4 nanoparticles which has a large capacity. As a consequence, a very high reversible capacity of up to 1413 mA h g(-1) at a current density of 0.1 A g(-1) after 100 cycles, a high rate capability (845, 560, 461 and 345 mA h g(-1) at 5, 10, 15 and 20 C, respectively, 1 C = 1 A g(-1)), and a superior cycling performance at an ultrahigh rate (760 mA h g(-1) at 5 C after 1000 cycles) are achieved by this lithium-ion-battery anode material.

以葡萄糖为碳源、硝酸钴为Co3O4前驱体，在氯化钠表面模板的辅助下成功合成了一种用于锂存储的高性能阳极材料，以减小碳片厚度。在此材料中，超细Co3O4纳米颗粒均匀地嵌入超薄多孔石墨碳中。具有大比表面积、高电子导电性和出色机械柔韧性的碳片，对于保持具有大容量的Co3O4纳米颗粒的稳定性非常有效。因此，这种锂离子电池阳极材料在0.1 A g(-1)的电流密度下经过100次循环后，具有高达1413 mA h g(-1)的非常高的可逆容量、高倍率性能（在5、10、15和20 C时分别为845、560、461和345 mA h g(-1)，1 C = 1 A g(-1)）以及在超高倍率下的优异循环性能（在5 C下经过1000次循环后为760 mA h g(-1)）。