Microsized single-crystal spinel LAMO for high-power lithium ion batteries synthesized via polyvinylpyrrolidone combustion method

作者：Dai Kehua; Mao Jing; Li Zitao; Zhai Yuchun; Wang Zhihui; Song Xiangyun; Battaglia Vince; Liu Gao^*

来源：Journal of Power Sources, 2014, 248: 22-27.

DOI：10.1016/j.jpowsour.2013.09.058

• Lithium ion battery
• Cathode material
• LiMn2O4
• Single crystal
• PVP combustion method

Microsized single-crystal Li1.08Mn1.89Al0.03O4 (LAMO) was synthesized via polyvinylpyriolidone (PVP) combustion method. X-ray diffraction (XRD), scanning electron microscope (SEM) and high-resolution transmission electron microscopy (HRTEM) characterization results indicate that the as-prepared LAMO has good crystallinity, uniform and smooth-surfaced morphology, and very low specific surface area. Galvanostatic charge-discharge tests demonstrate its excellent electrochemical performance. The capacity retentions at 30 degrees C and 55 degrees C are 98.8% and 93.3% respectively after 200 cycles at 1 C charge/discharge rate. Moreover, the LAMO exhibits excellent rate and low temperature performance. Even at high rates of 40 C and 60 C, the as-prepared LAMO are still able to deliver 91.2% and 85.6% capacity relative to the discharge capacity at C/5. The specific discharge capacity at -20 degrees C is 97.9 mAh g(-1) which is 93.7% of the capacity discharging at 25 degrees C. To study the reason of the excellent rate performance, the potential intermittent titration technique (PITT) tests and cyclic voltammetry (CV) measurements were conducted and the lithium chemical diffusion coefficient (DLi+) was calculated. Published by Elsevier B.V.

• 出版日期2014-2-15
• 单位东北大学