Affiliation:
1. Faculty of Chemistry Northeast Normal University 130024 Changchun P. R. China
2. National Institute of Education Singapore Nanyang Technological University Singapore 637616 Singapore Singapore
3. MOE Key Laboratory for UV Light‐Emitting Materials and Technology Northeast Normal University 130024 Changchun P. R. China
Abstract
AbstractBased on the favorable ionic conductivity and structural stability, sodium superionic conductor (NASICON) materials especially utilizing multivalent redox reaction of vanadium are one of the most promising cathodes in sodium‐ion batteries (SIBs). To further boost their application in large‐scale energy storage production, a rational strategy is to tailor vanadium with earth‐abundant and cheap elements (such as Fe, Mn), reducing the cost and toxicity of vanadium‐based NASICON materials. Here, the Na3.05V1.03Fe0.97(PO4)3 (NVFP) is synthesized with highly conductive Ketjen Black (KB) by ball‐milling assisted sol‐gel method. The pearl‐like KB branch chains encircle the NVFP (p‐NVFP), the segregated particles possess promoted overall conductivity, balanced charge, and modulated crystal structure during electrochemical progress. The p‐NVFP obtains significantly enhanced ion diffusion ability and low volume change (2.99%). Meanwhile, it delivers a durable cycling performance (87.7% capacity retention over 5000 cycles at 5 C) in half cells. Surprisingly, the full cells of p‐NVFP reveal a remarkable capability of 84.9 mAh g−1 at 20 C with good cycling performance (capacity decay rate is 0.016% per cycle at 2 C). The structure modulation of the p‐NVFP provides a rational design on the superiority of others to be put into practice.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Jilin Province
Higher Education Discipline Innovation Project
National Institute of Education
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)
Cited by
8 articles.
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