%0 Journal Article
%T A Facile Surface Reconstruction Mechanism toward Better Electrochemical Performance of Li4Ti5O12 in Lithium©\Ion Battery
%A Baohua Li
%A Dongqing Liu
%A Hai Li
%A Kun Qian
%A Linkai Tang
%A Marnix Wagemaker
%A Ruiying Shi
%A Yan©\Bing He
%J Archive of "Advanced Science".
%D 2017
%R 10.1002/advs.201700205
%X Through a facile sodium sulfide (Na2S)©\assisted hydrothermal treatment, clean and nondefective surfaces are constructed on micrometer©\sized Li4Ti5O12 particles. The remarkable improvement of surface quality shows a higher first cycle Coulombic efficiency (¡Ö95%), a significantly enhanced cycling performance, and a better rate capability in electrochemical measurements. A combined study of Raman spectroscopy and inductive coupled plasma emission spectroscopy reveals that the evolution of Li4Ti5O12 surface in a water©\based hydrothermal environment is a hydrolysis¨Crecrystallization process, which can introduce a new phase of anatase©\TiO2. While, with a small amount of Na2S (0.004 mol L£¿1 at least), the spinel©\Li4Ti5O12 phase is maintained without a second phase. During this process, the alkaline environment created by Na2S and the surface adsorption of the sulfur©\containing group (HS£¿ or S2£¿) can suppress the recrystallization of anatase©\TiO2 and renew the particle surfaces. This finding gives a better understanding of the surface¨Cproperty relationship on Li4Ti5O12 and guidance on preparation and modification of electrode material other than coating or doping
%K hydrothermal method
%K Li4Ti5O12
%K lithium©\ion batteries
%K Na2S
%K surface modifications
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5700637/