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Citation: GOU Lei, ZHAO Kun, MAO Yi-Yang, XIE Rong, FAN Xiao-Yong, LI Dong-Lin, MA Shou-Long, TIAN Miao. Copolymer Template-Assisted Synthesis of Porous Li2FeSiO4@C/CNTs Nanocomposite as Cathode Material with High Rate Capability[J]. Chinese Journal of Inorganic Chemistry, ;2015, (12): 2401-2410. doi: 10.11862/CJIC.2015.286 shu

Copolymer Template-Assisted Synthesis of Porous Li2FeSiO4@C/CNTs Nanocomposite as Cathode Material with High Rate Capability

  • 1.

    New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China

  • Corresponding author: LI Dong-Lin, 
  • Received Date: 10 July 2015
    Available Online: 14 August 2015

    Fund Project: 国家自然科学基金(No.21073021,21473014,21103013) (No.21073021,21473014,21103013)教育部科技创新工程重大项目培育资金(No.708084) (No.708084)中央高校基础研究经费 (No.0009-2014G1311085)资助项目。 (No.0009-2014G1311085)

  • Li2FeSiO4@C/CNTs (LFS@C/CNTs) nanocomposite was synthesized by a sol-gel method. A triblock copolymer P123 was used as the direction agent for nanopores and carbon source, and carbon nanotubes were used as conductive wires to further increase the conductivity of the material. The resulting LFS@C/CNTs nanocomposite possesses not only a nanoporous sponge-like structure for improving Li-ions transport by means of liquid electrolyte, but also a 3D self-bridged conduction hybrid network consisted of amorphous carbon coating and graphitized CNTs for electron fast transport that ultimately improves the high rate capability and cycling performance. As a result, the porous LFS@C/CNTs nanocomposite compared with nanoporous LFS@C exhibits a remarkable improvement in high-rate capability. The LFS@C/CNTs nanocomposite with 4wt% of CNTs delivers a specific discharge capacity of approximately 182 mAh·g-1 at 0.1C in the voltage window of 1.5~4.5 V, and the specific discharge capacity at 10C after 70 cycles maintains at 117 mA·h·g-1, which is more than two times that of LFS@C (55 mAh·g-1) as a cathode material for high power lithium ion battery.
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