Preparation and Characterization of Oxygen-Deficient Li4Ti5O12 Anode Material in Reducing Atmosphere for Lithium Ion Batteries

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhou, Xiong^1 ; Guo, Xingbo^1 ; Pu, Tong^1 ; Yang, Guiling^1 ; Dai, Yongnian^1

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, National Engineering Laboratory for Vacuum Metallurgy, Kunming

650093, China^1

关键词: Anode performance;    Cycling performance;    Electrical conductivity;    Electrochemical performance;    High charge/discharge rates;    Oxygen deficiency;    Reducing atmosphere;    Specific capacities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/2/022039/pdf
DOI  :  10.1088/1755-1315/252/2/022039

来源: IOP

【 摘 要 】

The poor electrical conductivity of Li4Ti5O12 has limited its practical application as high rates performance anode for lithium ion batteries. An oxygen deficient Li4Ti5O12 is investigated by a reducing atmosphere for lithium ion batteries in this work. Compared with pristine Li4Ti5O12 calcined at argon and air, the oxygen deficient Li4Ti5O12 exhibits significant improvement of electrochemical performance, it could deliver a specific capacity of 114.8 mAh g -1 even at a high charge/discharge rate of 10C and exhibit excellent cycling performance at low rates. However, more oxygen vacancies will increase the distortion of the lattice, causing serious deterioration in anode performance. Herein, an appropriate concentration of oxygen deficiency in oxygen-deficient Li4Ti5O12 is obtained by controlling the reducing atmosphere flow of ∼170 mL/min to possess optimal electrochemical performance.