Mesoporous composite of LiFePO4 and carbon microspheres as positive-electrode materials for lithium-ion batteries--颗粒学报PARTICUOLOGY

Tan, Q., Lv, C., Xu, Y., & Yang, J. (2014). Mesoporous composite of LiFePO4 and carbon microspheres as positive-electrode materials for lithium-ion batteries. Particuology, 17, 106–113. https://doi.org/10.1016/j.partic.2014.03.008

Mesoporous composite of LiFePO₄ and carbon microspheres as positive-electrode materials for lithium-ion batteries

Qiangqiang Tan ^a *, Cheng Lv ^{a b}, Yuxing Xu ^a, Jun Yang ^a

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b University of Chinese Academy of Sciences, Beijing 100190, China

10.1016/j.partic.2014.03.008

Volume 17, December 2014, Pages 106-113

Pages 106-113

E-mail: qtan@ipe.ac.cn; qtan@mail.ipe.ac.cn

Highlights

• Mesoporous composite of LiFePO₄ nanoparticles and carbon microspheres was fabricated.

• LiFePO₄nanoparticles were uniformly coated with carbon in mesoporous composites.

• High initial discharge capacity was reached for the composites as positive-electrode materials.

• The fabricated composites had high rate capability and good cycling stability.

Abstract

Mesoporous LiFePO₄/C microspheres consisting of LiFePO₄ nanoparticles are successfully fabricated by an eco-friendly hydrothermal approach combined with high-temperature calcinations using cost-effective LiOH and Fe³⁺ salts as raw materials. In this strategy, pure mesoporous LiFePO₄ microspheres, which are composed of LiFePO₄ nanoparticles, were uniformly coated with carbon (∼1.5 nm). Benefiting from this unique architecture, these mesoporous LiFePO₄/C microspheres can be closely packed, having high tap density. The initial discharge capacity of LiFePO₄/C microspheres as positive-electrode materials for lithium-ion batteries could reach 165.3 mAh/g at 0.1 C rate, which is notably close to the theoretical capacity of LiFePO₄ due to the large BET surface area, which provides for a large electrochemically available surface for the active material and electrolyte. The material also exhibits high rate capability (∼100 mAh/g at 8 C) and good cycling stability (capacity retention of 92.2% after 400 cycles at 8 C rate).

Graphical abstract

Keywords

LiFePO₄; Composite; Nanoparticle; Hydrothermal approach; Positive-electrode material; Lithium-ion battery

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