Exploring Route for Pyrophosphate-based Electrode Materials: Interplay between Synthesis and Structure

被引：3
作者：
Alekseeva, Anastasia M. [1 ]
Tertov, Ilya, V [1 ]
Mironov, Andrey, V [1 ]
Mikheev, Ivan, V [1 ]
Drozhzhin, Oleg A. [1 ,2 ]
Zharikova, Emiliya, V [1 ]
Rozova, Marina G. [1 ]
Antipov, Evgeny, V [1 ,2 ]
机构：
[1] Lomonosov Moscow State Univ, Chem Dept, Moscow 119991, Russia
[2] Skolkovo Inst Sci & Technol, Ctr Energy Sci & Technol, Moscow 143026, Russia
来源：
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2020年 / 646卷 / 14期
基金：
俄罗斯科学基金会;
关键词：
Sodium vanadium(III) monohydrogenphosphate hydrate; Sodium vanadium(III) monohydrogenphosphate; Sodium vanadium(III) pyrosphosphate; Cathode material; Hydrothermal synthesis; HYDROTHERMAL SYNTHESIS; CRYSTAL-STRUCTURES; PHOSPHATES;
D O I：
10.1002/zaac.202000066
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
New sodium vanadium(III) hydrogenphosphate hydrate NaV(HPO4)(2)(H2O)(0.5)and sodium vanadium(III) hydrogenphosphate beta-NaV(HPO4)(2)were prepared in mild hydrothermal conditions. The crystal structures of NaV(HPO4)(2)(H2O)(0.5)[space groupCc, Z= 4,a= 8.46174(19) angstrom,b= 9.52583(19) angstrom,c= 8.69376(15) angstrom,beta= 110.9553(11) degrees,V= 654.41(2) angstrom(3)] and beta-NaV(HPO4)(2)[space groupC2/c, Z= 4,a= 7.8681(3) angstrom,b= 9.8451(3) angstrom,c= 8.5180(2) angstrom,beta= 107.626(2) degrees,V= 628.85(3) angstrom(3)] were solved and refined from X-ray powder diffraction data. Both compounds were used as precursors in a new route for the preparation of attractive cathode material beta-NaVP2O7. The formation of the structure motive providing fast sodium ion diffusion at the first synthesis stage and its further conservation upon stepwise dehydration was revealed. The oversized Na+-embedding channels are stabilized by site-coordinated water in NaV(HPO4)(2)(H2O)(0.5)structure. The topology resemblance and difference in known sodium vanadium(III) complex phosphates are discussed.
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收藏
页码：1260 / 1266
页数：7
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