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Rational Architecture Design Enables Superior Na Storage in Greener NASICON‐Na 4 MnV(PO 4 ) 3 Cathode
Author(s) -
Li Huangxu,
Jin Ting,
Chen Xiaobin,
Lai Yanqing,
Zhang Zhian,
Bao Weizhai,
Jiao Lifang
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201801418
Subject(s) - materials science , cathode , vanadium , fast ion conductor , aerogel , carbon fibers , redox , nanotechnology , chemical engineering , chemistry , electrode , electrolyte , metallurgy , composite material , engineering , composite number
Na 3 V 2 (PO 4 ) 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 Na 4 MnV(PO 4 ) 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, Na 4 MnV(PO 4 ) 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 Na 4 MnV(PO 4 ) 3 material is synthesized through a feasible solution‐route method. The elaborately designed Na 4 MnV(PO 4 ) 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 Na 4 MnV(PO 4 ) 3 , which are deeply investigated by both experiments and calculations.