4.8 Article

Simultaneous Incorporation of V and Mn Element into Polyanionic NASICON for High Energy-Density and Long-Lifespan Zn-Ion Storage

期刊

ADVANCED ENERGY MATERIALS
卷 12, 期 23, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202200654

关键词

aqueous Zn-ion batteries; high energy density; multiple-electron transfer; Na; 4VMn(PO; (4)); (3); NASICON

资金

  1. Natural Science Foundation of Jiangsu Province [BK20211516]
  2. National Natural Science Foundation of China [52171203, 51872051]
  3. National Key Research and Development Program of China [2021YFB2400400]
  4. State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF202102]
  5. Fundamental Research Funds for the Central Universities [2242022R10090]

向作者/读者索取更多资源

In this study, a novel cathode material Na4VMn(PO4)3@Graphene for aqueous Zn-ion battery (AZIB) was developed, which exhibited high energy density and long lifespan. The compound utilized V and Mn elements to achieve a two-step electron transfer mechanism, resulting in improved capacity and working voltage.
Aqueous Zn-ion battery (AZIB) has attracted huge attention due to its distinct advantages such as abundant zinc sources, low development cost, high security, and environmental friendliness compared to traditional commercialized batteries. Developing novel cathode materials with high energy density and long lifespan is very important for the practical application of AZIB in the coming years. Herein, V and Mn elements are simultaneously incorporated into the NASICON host to make use of the electrochemical redox reaction in both V and Mn transition metal elements for aqueous Zn-ion storage. A significant increase in both capacity and working voltage has been observed after Mn doping into Na3V2(PO4)(3) to form Na4VMn(PO4)(3). Taking advantage of the merits of both high capacity and high voltage, the Na4VMn(PO4)(3)@Graphene cathode delivers an optimal energy density of 309.7 Wh kg(-1) with very stable cycle performance (89.1% capacity retention after 3000 cycles at 5.0 A g(-1)). A two-step electron transfer mechanism between V4+/V3+ and Mn3+/Mn2+ redox couple in Na4VMn(PO4)(3) has been revealed during the electrochemical process for Zn-ion storage.

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