Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (10): 1172-1180.DOI: 10.11944/j.issn.1000-0518.2020.10.200072

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In Situ Synthesis of Nitrogen-Doped Carbon Coated CoxP Composites and Their Lithium Properties

ZHANG Xinyua, QU Jiangyingb, TANG Zhanleic, LI Jielana, WANG Taob, GAO Fengb*   

  1. aFaculty of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China;
    bSchool of Environment and Civil Engineering,Dongguan University of Technology,Dongguan,Guangdong 523808,China;
    cGuangdong Kaijin New Energy Technology Corp,Ltd. Dongguan,Guangdong 523808,China
  • Received:2020-03-16 Published:2020-10-01 Online:2020-09-30
  • Contact: GAO Feng, associate professor; Tel:0769-22861232; E-mail:fenggao2003@163.com; Research interests:synthesis and performances of carbon materials
  • Supported by:
    Supported by the NSFC(No.U1610114, No.51972059), and the CSC Fund(No.201908440038)

Abstract: Nitrogen-doped carbon coated Co2P@N-C and CoP@N-C composites were in situ synthesized at 800 ℃ using zeolitic imidazolate framework-67 (ZIF-67) as cobalt/nitrogen/carbon precursor and red phosphorus as phosphorus source, and their electrochemical properties were studied as anode materials of lithium ion batteries. It is found that the resulted products can be tailored by the ratio of ZIF-67 to red phosphorus. The obtained Co2P@N-C and CoP@N-C composites show regular dodecahedron and the size of about 250 to 400 nm and exhibit good conductivity. When they are used as anode materials, the first discharge capacity of the Co2P@N-C and CoP@N-C composites are 942 and 1170.6 mA·h/g at the current density of 0.05 A/g, respectively. Even at the current density of 1 A/g, their capacities are maintained at 306.6 and 180.3 mA·h/g after 500 cycles, respectively. We have provided a green and easy method for the synthesis of CoxP@C composites for lithium ion battery.

Key words: lithium ion batteries, cathode material, CoxP composites, zeolitic imidazolate framework-67, red phosphorus, in situ nitrogen doped carbon