SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (7): 1935-1940.DOI: 10.1016/j.cjche.2020.01.008

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Nitrogen-doped carbon stabilized LiFe0.5Mn0.5PO4/rGO cathode materials for high-power Li-ion batteries

Haifeng Yu1, Zhaofeng Yang2, Huawei Zhu1, Hao Jiang1,2, Chunzhong Li1,2   

  1. 1 Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2 Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
  • 收稿日期:2019-12-04 修回日期:2020-01-14 出版日期:2020-07-28 发布日期:2020-08-31
  • 通讯作者: Hao Jiang
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China(21975074, 91534202, and 91834301), the Shanghai Scientific and Technological Innovation Project(18JC1410500), and the Fundamental Research Funds for the Central Universities(222201718002).

Nitrogen-doped carbon stabilized LiFe0.5Mn0.5PO4/rGO cathode materials for high-power Li-ion batteries

Haifeng Yu1, Zhaofeng Yang2, Huawei Zhu1, Hao Jiang1,2, Chunzhong Li1,2   

  1. 1 Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2 Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2019-12-04 Revised:2020-01-14 Online:2020-07-28 Published:2020-08-31
  • Contact: Hao Jiang
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(21975074, 91534202, and 91834301), the Shanghai Scientific and Technological Innovation Project(18JC1410500), and the Fundamental Research Funds for the Central Universities(222201718002).

摘要: Exploring high ion/electron conductive olivine-type transition metal phosphates is of vital significance to broaden their applicability in rapid-charging devices. Herein, we report an interface engineered LiFe0.5Mn0.5PO4/rGO@C cathode material by the synergistic effects of rGO and polydopamine-derivedN-doped carbon. The well-distributed LiFe0.5Mn0.5PO4 nanoparticles are tightly anchored on rGO nanosheet benefited by the coating of N-doped carbon layer. The design of such an architecture can effectively suppress the agglomeration of nanoparticles with a shortened Li+ transfer path. Meantime, the high-speed conducting network has been constructed by rGO and N-doped carbon, which exhibits the face-to-face contact with LiFe0.5Mn0.5PO4 nanoparticles, guaranteeing the rapid electron transfer. These profits endow the LiFe0.5Mn0.5PO4/rGO@C hybrids with a fast charge-discharge ability, e.g. a high reversible capacity of 105 mAh·g-1 at 10 C, much higher than that of the LiFe0.5Mn0.5PO4@C nanoparticles (46 mA·h·g-1). Furthermore, a 90.8% capacity retention can be obtained even after cycling 500 times at 2 C. This work gives a new avenue to fabricate transition metal phosphate with superior electrochemical performance for high-powerLi-ion batteries.

关键词: Cathode materials, High power density, Carbon, Long cycle life, Li-ion batteries

Abstract: Exploring high ion/electron conductive olivine-type transition metal phosphates is of vital significance to broaden their applicability in rapid-charging devices. Herein, we report an interface engineered LiFe0.5Mn0.5PO4/rGO@C cathode material by the synergistic effects of rGO and polydopamine-derivedN-doped carbon. The well-distributed LiFe0.5Mn0.5PO4 nanoparticles are tightly anchored on rGO nanosheet benefited by the coating of N-doped carbon layer. The design of such an architecture can effectively suppress the agglomeration of nanoparticles with a shortened Li+ transfer path. Meantime, the high-speed conducting network has been constructed by rGO and N-doped carbon, which exhibits the face-to-face contact with LiFe0.5Mn0.5PO4 nanoparticles, guaranteeing the rapid electron transfer. These profits endow the LiFe0.5Mn0.5PO4/rGO@C hybrids with a fast charge-discharge ability, e.g. a high reversible capacity of 105 mAh·g-1 at 10 C, much higher than that of the LiFe0.5Mn0.5PO4@C nanoparticles (46 mA·h·g-1). Furthermore, a 90.8% capacity retention can be obtained even after cycling 500 times at 2 C. This work gives a new avenue to fabricate transition metal phosphate with superior electrochemical performance for high-powerLi-ion batteries.

Key words: Cathode materials, High power density, Carbon, Long cycle life, Li-ion batteries