Hierarchical LiMn2O4 microspheres for high rate lithium ion batteries, and direct electrochemistry and electrocatalysis

作者：Gu, Yuanxiang^*; Tang, Zhanlei; Deng, Ying; Wang, Lei

来源：Electrochimica Acta, 2013, 94: 165-171.

DOI：10.1016/j.electacta.2013.01.111

• LiMn2O4
• Cathode material
• Lithium ion batteries
• Direct electrochemistry
• Electrocatalysis

Hierarchical LiMn2O4 microspheres were prepared using urchin-like alpha-MnO2 as a self-sacrificial template. As the cathode material for lithium ion batteries, the electrochemical properties were characterized by cyclic voltammetry and charge/discharge experiments. The results indicated that the LiMn2O4 microspheres had high discharge capacity and excellent cycle stability. Furthermore, a new electrochemical biosensor was constructed by immobilization of bovine myoglobin (Mb) and LiMn2O4 in a thin film of chitosan (CTS) on the surface of carbon ionic liquid electrode (CILE). Electrochemical behaviors of Mb entrapped in the film were investigated by cyclic voltammetry. A pair of well-defined redox peaks appears, which indicates a fast electron transfer rate of Mb with the underlying CILE. The electron transfer coefficient and electron transfer rate constant of Mb were calculated to be 0.47 and 1.04 s(-1), respectively. The Mb modified electrode showed good electrocatalytic ability toward the reduction of trichloroacetic acid (TCA) with a detection limit of 0.16 mmol L-1 (3 sigma).

• 出版日期2013-4-1
• 单位青岛科技大学