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

JOURNAL OF POWER SOURCES

卷:248

Article

Dai, Kehua^1,2  Mao, Jing^1,2  Li, Zitao¹  Zhai, Yuchun¹  Wang, Zhihui²  Song, Xiangyun²  Battaglia, Vince²  Liu, Gao² 

[1] Northeastern Univ, Sch Met & Mat, Shenyang 110004, Peoples R China

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

关键词: Lithium ion battery;    Cathode material;    LiMn2O4;    Single crystal;    PVP combustion method;   

DOI  :  10.1016/j.jpowsour.2013.09.058

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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