New NASICON-type phosphates, KNbM(PO4)3 (M = Ti, V), exhibiting a reversible alkali metal intercalation
Rodion V Panin
1
,
Ilia R Cherkashchenko
1, 2
,
Ivan V Mikheev
1
,
Dmitrii N Stolbov
1
,
Evgeny V. Antipov
1, 2
,
Nellie R. Khasanova
1
Publication type: Journal Article
Publication date: 2025-02-01
scimago Q1
wos Q1
SJR: 0.758
CiteScore: 6.7
Impact factor: 5.4
ISSN: 13877003, 18790259
Abstract
The NASICON framework is an attractive object for designing polyanion electrode materials for metal-ion batteries. Two new NASICON-structured (S.G. R-3c) niobium phosphates KNbTi(PO4)3 (a = 8.4307(1) Å, c = 23.3955(4) Å, V = 1440.11(5) Å3) and KNbV(PO4)3 (a = 8.4892(1) Å, c = 23.3042(4) Å, V = 1454.45(3) Å3) were synthesized by the Pechini sol–gel method. Rietveld refinement revealed the potassium atoms occupy only the A(1) 6-fold antiprismatic site in both structures. Nb K-edge XANES measurements confirmed the presence of Nb5+ in KNbV(PO4)3 and the mixed-valent Nb5+/4+ in KNbTi(PO4)3 phosphates. Electrochemical measurements showed that both compounds deliver the initial discharge capacity of 110–120 mAh g−1 at a C/10 rate in the Na-half cell. KNbV(PO4)3 also maintains a reversible K+ intercalation at about 1.5 V vs. K+/K with a significant hysteresis (∼0.35 V at a C/10 rate) indicating a sluggish K+ diffusion. The mobility of alkali metal ions within the framework of new phosphates is discussed in terms of bond valence site energy calculations.
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Panin R. V. et al. New NASICON-type phosphates, KNbM(PO4)3 (M = Ti, V), exhibiting a reversible alkali metal intercalation // Inorganic Chemistry Communication. 2025. Vol. 172. p. 113676.
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Panin R. V., Cherkashchenko I. R., Novichkov D. A., Mikheev I. V., Stolbov D. N., Antipov E. V., Khasanova N. R. New NASICON-type phosphates, KNbM(PO4)3 (M = Ti, V), exhibiting a reversible alkali metal intercalation // Inorganic Chemistry Communication. 2025. Vol. 172. p. 113676.
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TY - JOUR
DO - 10.1016/j.inoche.2024.113676
UR - https://linkinghub.elsevier.com/retrieve/pii/S1387700324016666
TI - New NASICON-type phosphates, KNbM(PO4)3 (M = Ti, V), exhibiting a reversible alkali metal intercalation
T2 - Inorganic Chemistry Communication
AU - Panin, Rodion V
AU - Cherkashchenko, Ilia R
AU - Novichkov, Daniil A
AU - Mikheev, Ivan V
AU - Stolbov, Dmitrii N
AU - Antipov, Evgeny V.
AU - Khasanova, Nellie R.
PY - 2025
DA - 2025/02/01
PB - Elsevier
SP - 113676
VL - 172
SN - 1387-7003
SN - 1879-0259
ER -
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@article{2025_Panin,
author = {Rodion V Panin and Ilia R Cherkashchenko and Daniil A Novichkov and Ivan V Mikheev and Dmitrii N Stolbov and Evgeny V. Antipov and Nellie R. Khasanova},
title = {New NASICON-type phosphates, KNbM(PO4)3 (M = Ti, V), exhibiting a reversible alkali metal intercalation},
journal = {Inorganic Chemistry Communication},
year = {2025},
volume = {172},
publisher = {Elsevier},
month = {feb},
url = {https://linkinghub.elsevier.com/retrieve/pii/S1387700324016666},
pages = {113676},
doi = {10.1016/j.inoche.2024.113676}
}