Controllable synthesis of Fe 3 O 4 polyhedron possessing excellent high-rate electrochemical performance for lithium-ion batteries

Autor: Wenqing Zhong, Xiaohong Huang, Hu Zhang, Chuan Ding, Chongjiang Dai, Xiaoshu Jiang, Yifei Xia
Rok vydání: 2018
Předmět:
Zdroj: Materials Research Bulletin. 97:142-149
ISSN: 0025-5408
Popis: Fe 3 O 4 nanocrystals (NCs) composed of different proportion of {100} and {111} facets were prepared using oleic acid and decanoic acid as surfactant to mediate their growth process. It has been found that the morphology of Fe 3 O 4 NCs can be tuned by changing the ratio of oleic acid and decanoic acid. When tested as the anode materials in LIBs, the Fe 3 O 4 octahedrons obtained after annealing at 450 °C was found to exhibit superior electrochemical performances with a high reversible capacity of 882.6 mAh g −1 at 1 A g −1 over 200 cycles, whereas the Fe 3 O 4 cubooctahedron and cubes bearing poor electrochemical performances. The present results prove that the surface structure of Fe 3 O 4 polyhedrons significantly influence the utilization of Fe 3 O 4 active materials and hence their electrochemical performance although the morphology will be destroyed during cycling.
Databáze: OpenAIRE