Porous LiMn2O4 Nano-Microspheres as Durable High Power Cathode Materials for Lithium Ion Batteries

Xiaoling Cui Xiaoling Cui , Huixia Feng Huixia Feng , Jinliang Liu Jinliang Liu , Fengjuan Tang Fengjuan Tang , Hongliang Li Hongliang Li
Российский электрохимический журнал
Abstract / Full Text

Porous LiMn2O4 spheres was easily fabricated with MnCO3 spheres and MnO2 as precursors and characterized in terms of structure and performance as the cathode of a lithium ion battery. The presence of pores with the average size of about 50 nm throughout the whole LiMn2O4 microspheres was confirmed by scanning electron microscope (SEM) and N2 adsorption-desorption measurements. The electrochemical tests show that the synthesized product has smaller electrochemical polarization, faster Li-ion intercalation kinetics and higher electrochemical stability. It exhibits excellent rate capability and cyclic stability: delivering a reversible discharge capacity of 71 mA h g−1 at a 5 C rate and yielding a capacity retention of over 92% at a rate of 0.5 C after 100 cycles. The superior performance of the synthesized product is attributed to its special structure: porous secondary spheres particles consisting of primary single-crystalline nanoparticles. The nanoparticle reduces the path of Li-ion diffusion and increases the reaction sites for lithium insertion/extraction, the pores provide room to buffer the volume changes during charge-discharge and the single crystalline nanoparticle endows the spinel with the best stability. Taking the excellent electrochemical performance and facile synthesis into consideration, the presented porous LiMn2O4 spheres could be a competitive candidate cathode material for high-performance lithium-ion batteries.

Author information
  • State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Xiaoling Cui & Huixia Feng

  • School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Xiaoling Cui & Huixia Feng

  • College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China

    Xiaoling Cui, Huixia Feng, Jinliang Liu, Fengjuan Tang & Hongliang Li

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