Author:
Matsubara Nami,Nocerino Elisabetta,Forslund Ola Kenji,Zubayer Anton,Papadopoulos Konstantinos,Andreica Daniel,Sugiyama Jun,Palm Rasmus,Guguchia Zurab,Cottrell Stephen P.,Kamiyama Takashi,Saito Takashi,Kalaboukhov Alexei,Sassa Yasmine,Masese Titus,Månsson Martin
Abstract
AbstractIn the quest for developing novel and efficient batteries, a great interest has been raised for sustainable K-based honeycomb layer oxide materials, both for their application in energy devices as well as for their fundamental material properties. A key issue in the realization of efficient batteries based on such compounds, is to understand the K-ion diffusion mechanism. However, investigation of potassium-ion (K$$^+$$
+
) dynamics in materials using e.g. NMR and related techniques has so far been very challenging, due to its inherently weak nuclear magnetic moment, in contrast to other alkali ions such as lithium and sodium. Spin-polarised muons, having a high gyromagnetic ratio, make the muon spin rotation and relaxation ($$\mu ^+$$
μ
+
SR) technique ideal for probing ions dynamics in these types of energy materials. Here we present a study of the low-temperature magnetic properties as well as K$$^+$$
+
dynamics in honeycomb layered oxide material $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$
K
2
Ni
2
TeO
6
using mainly the $$\mu ^+$$
μ
+
SR technique. Our low-temperature $$\mu ^+$$
μ
+
SR results together with complementary magnetic susceptibility measurements find an antiferromagnetic transition at $$T_{\mathrm{N}}\approx 27$$
T
N
≈
27
K. Further $${\mu}^{+}$$
μ
+
SR studies performed at higher temperatures reveal that potassium ions (K$$^+$$
+
) become mobile above 200 K and the activation energy for the diffusion process is obtained as $$E_{\mathrm{a}}=121 (13)$$
E
a
=
121
(
13
)
meV. This is the first time that K$$^+$$
+
dynamics in potassium-based battery materials has been measured using $$\mu ^+$$
μ
+
SR. Assisted by high-resolution neutron diffraction, the temperature dependence of the K-ion self diffusion constant is also extracted. Finally our results also reveal that K-ion diffusion occurs predominantly at the surface of the powder particles. This opens future possibilities for potentially improving ion diffusion as well as K-ion battery device performance using nano-structuring and surface coatings of the particles.
Funder
Stiftelsen för Strategisk Forskning
Chalmers Area of Advance-Materials science
Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii
Japan Society for the Promotion of Science
Vetenskapsrådet
Japan Prize Foundation
Carl Tryggers Stiftelse för Vetenskaplig Forskning
Kungliga Tekniska Hogskolan
Publisher
Springer Science and Business Media LLC
Cited by
19 articles.
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