journal article·2020-01-27

New Dimorphs of Na5V(PO4)2F2 as an Ultrastable Cathode Material for Sodium-Ion Batteries

Ziteng Liang, Xiaofeng Zhang, Rui Liu, Gregorio F. Ortiz, Guiming Zhong, Yuxuan Xiang, Shijian Chen, Jinxiao Mi, Shunqing Wu, Yong Yang

ACS Applied Energy Materials· Volume 3· Issue 1
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Abstract

In this work, a new fluorophosphate cathode material Na5V(PO4)2F2 for sodium-ion batteries is synthesized by a facile synthetic strategy for the first time. X-ray diffraction analyses indicate that the novel material adopts two space groups (i.e., dimorphs): an orthorhombic form (space group (SG): Pbca) at high temperature (800 °C) and a trigonal form (SG: P3) at low temperature (600 °C). Both of them have a layered structure and could reversibly (de)intercalate one sodium with a V3+/V4+ redox couple. The new dimorphs also exhibit a high operating voltage due to the “induction effect” of fluorine, i.e., 3.4 V for trigonal Na5V(PO4)2F2 (t-NVPF) and 3.5 V for orthorhombic Na5V(PO4)2F2 (o-NVPF), respectively. In addition, they both exhibit outstanding cyclic stability, showing high capacity retentions of 86.5% and 92.6% after 1000 cycles for o-NVPF/C and t-NVPF at 136 mA g–1, respectively. On the basis of ex situ XRD and DFT calculations, the excellent cycling performance of NVPF compounds such as t-NVPF is attributed to their robust polyanion framework, with fewer volume changes during reversible Na+ (de)intercalation processes.
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Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Chemical Synthesis and Characterization

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Affiliations

Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China

Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen 361005, P. R. China

School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, P. R. China

Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Química Fina y Nanoquímica, Universidad de Córdoba, Edificio Marie Curie, Campus de Rabanales, 14071 Córdoba, Spain

Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen 361021, P. R. China

Department of Material Science and Engineering, Xiamen University, Xiamen 361005, P. R. China

Funding

National Natural Science Foundation of China · Spanish Ministry of Science and Innovation · National Key Research and Development Program of China

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