In situ atomic-scale engineering of the chemistry and structure of the grain boundaries region of Li3xLa2/3-xTiO3. (August 2020)

• Record Type: Journal Article
• Authors: He, Xiaoning; Li, Shaoyin; Cao, Guoqin; Hu, Junhua; Zhang, Jinhua; Qiao, Rui; Pan, Jinmin; Shao, Guosheng
• Is Part Of: Scripta materialia. Number 185(2020)
• Page Start: 134
• Page End: 139
• Publication Date: 2020-08
• Subjects: Electron energy loss spectroscopy (EELS) -- Grain boundaries -- Electrochemistry -- Li3xLa2/3-xTiO3 -- Lithium-ion batteries; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.04.018
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Severe deviation in structure and chemistry at grain boundaries has been regarded as the source of the poor conductivity of Li3 x La2/3 -x TiO3 . In this work, we report an in situ grain boundary engineering method to address this bottleneck. A lithium-rich electrolyte, Li3 OCl, was introduced into Li3 x La2/3- x TiO3 to replenish lithium at the grain boundaries. Both the Li-gain on the boundary and generation of a Li-rich grain-engineered layer contributed to an optimized grain boundary conductivity of 1.52 × 10 −4 (S/cm) and a depressed activation energy of 0.32 eV for grain boundary. Full batteries were further employed to demonstrate the enhancement in conductivity. Graphical abstract: Image, graphical abstract