In Situ Fabrication of Carbon-Encapsulated Fe₇X₈ (X = S, Se) for Enhanced Sodium Storage

Tiezhong Liu; Youpeng Li; Lingzhi Zhao; Fenghua Zheng; Yayun Guo; Yanxin Li; Qichang Pan; Yanzhen Liu; Junhua Hu; Chenghao Yang

doi:10.1021/acsami.9b00500

journal article·2019-05-29

In Situ Fabrication of Carbon-Encapsulated Fe₇X₈ (X = S, Se) for Enhanced Sodium Storage

Tiezhong Liu, Youpeng Li, Lingzhi Zhao, Fenghua Zheng, Yayun Guo, Yanxin Li, Qichang Pan, Yanzhen Liu, Junhua Hu, Chenghao Yang

ACS Applied Materials & Interfaces· Volume 11· Issue 21

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Source abstract

Abstract

Sodium-ion batteries (SIBs) have been regarded as a promising alternative to lithium-ion batteries due to the natural abundance of sodium in the earth's crust. In our work, fusiform Fe₇X₈@C (X = S, Se) composites were obtained via a one-step pyrolysis strategy applied to SIB anode materials. The formed carbon skeleton could prevent the Fe₇X₈ nanoparticles from agglomeration and stabilize the interface of Fe/Na₂X generated in the redox reactions. Fe₇X₈@C (X = S, Se) exhibits excellent reversible specific capacity (1005.3 mAh g^-1 under 0.2 A g^-1 for Fe₇S₈@C and 458.5 mAh g^-1 under 0.5 A g^-1 for Fe₇Se₈@C), outstanding rate performance (654.7 mAh g^-1 for Fe₇S₈@C and 392.9 mAh g^-1 for Fe₇Se₈@C going through 300 loops even under 2 A g^-1), and excellent cycling properties (795.8 mAh g^-1 after 50 loops under 0.2 A g^-1 for Fe7S₈@C and 399.9 mAh g^-1 going through 150 loops under 0.5 A g^-1 for Fe₇Se₈@C). The excellent electrochemical performance of Fe₇X₈@C composites makes them promising anode materials for SIBs.

Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

Energy storage Nanomaterials Composites

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials, Institute of Opto-Electronic Materials and Technology, South China Normal University, Guangzhou 510631, P. R. China

Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China

Funding

Ministry of Education of the People's Republic of China · China Postdoctoral Science Foundation · Natural Science Foundation of Guangdong Province · National Natural Science Foundation of China · Guangzhou City · Guangdong Province

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