%0 Journal Article
%A Yu, Xiqian
%A Pan, Huilin
%A Wan, Wang
%A Ma, Chao
%A Bai, Jianming
%A Meng, Qingping
%A Ehrlich, Steven
N.
%A Hu, Yong-Sheng
%A Yang, Xiao-Qing
%D 2013
%T A Size-Dependent Sodium Storage Mechanism in Li4Ti5O12 Investigated by a Novel Characterization
Technique Combining in Situ X‑ray Diffraction and Chemical
Sodiation
%U https://acs.figshare.com/articles/journal_contribution/A_Size_Dependent_Sodium_Storage_Mechanism_in_Li_sub_4_sub_Ti_sub_5_sub_O_sub_12_sub_Investigated_by_a_Novel_Characterization_Technique_Combining_in_Situ_X_ray_Diffraction_and_Chemical_Sodiation/2368255
%R 10.1021/nl402263g.s001
%2 https://acs.figshare.com/ndownloader/files/4007707
%K Li 4Ti system
%K sodium insertion behavior
%K solution reaction behavior
%K chemical sodiation method
%K XRD
%K ion diffusion kinetics
%K Li 4Ti Investigated
%K ion diffusion coefficient
%K Novel Characterization Technique
%K sodium insertion
%K Chemical SodiationA novel characterization technique
%K Li 4Ti
%X A novel characterization technique
using the combination of chemical
sodiation and synchrotron based in situ X-ray diffraction (XRD) has
been detailed illustrated. The power of this novel technique was demonstrated
in elucidating the structure evolution of Li4Ti5O12 upon sodium insertion. The sodium insertion behavior
into Li4Ti5O12 is strongly size dependent.
A solid solution reaction behavior in a wide range has been revealed
during sodium insertion into the nanosized Li4Ti5O12 (∼44 nm), which is quite different from the
well-known two-phase reaction of Li4Ti5O12/Li7Ti5O12 system during
lithium insertion, and also has not been fully addressed in the literature
so far. On the basis of this in situ experiment, the apparent Na+ ion diffusion coefficient (DNa+) of Li4Ti5O12 was estimated in the magnitude of 10–16 cm2 s–1, close to the
values estimated by electrochemical method, but 5 order of magnitudes
smaller than the Li+ ion diffusion coefficient (DLi+ ∼10–11 cm2 s–1), indicating a sluggish Na+ ion diffusion kinetics in
Li4Ti5O12 comparing with that of
Li+ ion. Nanosizing the Li4Ti5O12 will be critical to make it a suitable anode material for
sodium-ion batteries. The application of this novel in situ chemical
sodiation method reported in this work provides a facile way and a
new opportunity for in situ structure investigations of various sodium-ion
battery materials and other systems.
%I ACS Publications