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

doi:10.1016/j.cjche.2020.01.008

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 LiFe_0.5Mn_0.5PO₄/rGO cathode materials for high-power Li-ion batteries

Haifeng Yu¹, Zhaofeng Yang², Huawei Zhu¹, Hao Jiang^1,2, Chunzhong Li^1,2

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 LiFe_0.5Mn_0.5PO₄/rGO cathode materials for high-power Li-ion batteries

Haifeng Yu¹, Zhaofeng Yang², Huawei Zhu¹, Hao Jiang^1,2, Chunzhong Li^1,2

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/Abstract

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 LiFe_0.5Mn_0.5PO₄/rGO@C cathode material by the synergistic effects of rGO and polydopamine-derivedN-doped carbon. The well-distributed LiFe_0.5Mn_0.5PO₄ 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 LiFe_0.5Mn_0.5PO₄ nanoparticles, guaranteeing the rapid electron transfer. These profits endow the LiFe_0.5Mn_0.5PO₄/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 LiFe_0.5Mn_0.5PO₄@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 LiFe_0.5Mn_0.5PO₄/rGO@C cathode material by the synergistic effects of rGO and polydopamine-derivedN-doped carbon. The well-distributed LiFe_0.5Mn_0.5PO₄ 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 LiFe_0.5Mn_0.5PO₄ nanoparticles, guaranteeing the rapid electron transfer. These profits endow the LiFe_0.5Mn_0.5PO₄/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 LiFe_0.5Mn_0.5PO₄@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

Haifeng Yu, Zhaofeng Yang, Huawei Zhu, Hao Jiang, Chunzhong Li. Nitrogen-doped carbon stabilized LiFe_0.5Mn_0.5PO₄/rGO cathode materials for high-power Li-ion batteries[J]. 中国化学工程学报, 2020, 28(7): 1935-1940.

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Nitrogen-doped carbon stabilized LiFe_0.5Mn_0.5PO₄/rGO cathode materials for high-power Li-ion batteries

Nitrogen-doped carbon stabilized LiFe_0.5Mn_0.5PO₄/rGO cathode materials for high-power Li-ion batteries

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