Morphology control and electrochemical properties of LiFePO4/C composite cathode for lithium ion batteries

作者：Hamamoto K^*; Fukushima M; Mamiya M; Yoshizawa Y; Akimoto J; Suzuki T; Fujishiro Y

来源：Solid State Ionics, 2012, 225: 560-563.

DOI：10.1016/j.ssi.2012.01.034

• Lithium-ion batteries
• LiFePO4
• Cathode
• Porous
• Gelation-freezing method

We developed a novel cathode electrode system composed of ultra highly porous structured LiFePO4/carbon composite for lithium ion batteries by a gelation-freezing (GF) method. This unique technique can be used to provide various shaped components by use of specific molds, and varying the freezing temperature could control the micrometer-sized cylindrical pore size and wall thickness in the porous composite. Film shapes of carbons that originate in the gelatin were found in the porous LiFePO4/carbon composite cathodes. The porous composite cathode shows a good electrochemical performance at a low current density, despite the low carbon content. Charge/discharge capacities for the LiFePO4/carbon composites decreased with decreasing gel-freezing temperature. The template-free GF method for fabricating the porous LiFePO4/carbon composite opens up a new route to develop electrodes with controlled morphologies for applications in high power lithium batteries.

• 出版日期2012-10-4