Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Na-ion diffusion and electrochemical performance of NaVO$_3$ anode in
  Li/Na batteries   We study Na ion diffusion and electrochemical performance of NaVO$_3$ (NVO)
as anode material in Li/Na--ion batteries with the specific capacity of
$\approx$350 mAhg$^{-1}$ at the current density 11~mAg$^{-1}$ after 300 cycles.
Remarkably, the capacity retains $\ge$200~mAhg$^{-1}$ even after 400~cycles at
44~mAg$^{-1}$ with Coulombic efficiency $>$99\%. The deduced diffusion
coefficient from galvanostatic intermittent titration technique (GITT),
electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)
measurements for NVO as anode in Li--ion battery is in the range of
10$^{-10}$--10$^{-12}$~cm$^2$s$^{-1}$. In case of Na-ion batteries, the NVO
electrode exhibits initial capacity of 385~mAhg$^{-1}$ at 7~mAg$^{-1}$ current
rate, but the capacity degradation is relatively faster in subsequent cycles.
We find the diffusion coefficient of NVO--Na cells similar to that of NVO--Li.
On the other hand, our charge discharge measurements suggest that the overall
performance of NVO anode is better in Li--ion battery than Na-ion. Moreover, we
use the density functional theory to simulate the energetics of Na vacancy
formation in the bulk of the NVO structure, which is found to be 0.88~eV higher
than that of the most stable (100) surface. Thus, the Na ion incorporation at
the surface of the electrode material is more facile compared to the bulk.

1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess