Rational Architecture Design Enables Superior Na Storage in Greener NASICON‐Na4MnV(PO4)3 Cathode. Issue 24 (25th June 2018)

• Record Type: Journal Article
• Authors: Li, Huangxu; Jin, Ting; Chen, Xiaobin; Lai, Yanqing; Zhang, Zhian; Bao, Weizhai; Jiao, Lifang
• Is Part Of: Advanced energy materials. Volume 8:Issue 24(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-25
• Subjects: cathode materials -- Na4MnV(PO4)3 -- Na3V2(PO4)3 -- NASICON‐structured -- sodium‐ion batteries; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201801418
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Na3 V2 (PO4 )3 has attracted great attention due to its high energy density and stable structure. However, in order to boost its application, the discharge potential of 3.3–3.4 V (vs Na + /Na) still needs to be improved and substitution of vanadium with other lower cost and earth‐abundant active redox elements is imperative. Therefore, the Na superionic conductor (NASICON)‐structured Na4 MnV(PO4 )3 seems to be more attractive due to its lower toxicity and higher voltage platform resulting from the partial substitution of V with Mn. However, Na4 MnV(PO4 )3 still suffers from poor electronic conductivity, leading to unsatisfactory capacity delivering and poor high‐rate capability. In this work, a graphene aerogel–supported in situ carbon–coated Na4 MnV(PO4 )3 material is synthesized through a feasible solution‐route method. The elaborately designed Na4 MnV(PO4 )3 can reach ≈380 Wh kg −1 at 0.5 C (1 C = 110 mAh g −1 ) and realize superior high‐rate capability evenat 50 C (60.1 mAh g −1 ) with a long cycle‐life of 4000 cycles at 20 C. This impressive progress should be ascribed to the multifunctional 3D carbon framework and the distinctive structure of trigonal Na4 MnV(PO4 )3, which are deeply investigated by both experiments and calculations. Abstract : A graphene aerogel–supported in situ carbon–coated Na4 MnV(PO4 )3 material (NMVP@C@GA) is synthesized through a feasible solution‐route method. The NMVP@C@GA is able to achieve ultrahigh rate capability (60.1 mAh g −1 at 50 C) and ultralong cycling stability (68.8% of capacity retention after 4000 cycles at 20 C).