Details

Autor(en) / Beteiligte

• Dai, Kehua
• Mao, Jing
• Li, Zitao
• Zhai, Yuchun
• Wang, Zhihui
• Song, Xiangyun
• Battaglia, Vince
• Liu, Gao

Titel

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

Ist Teil von

• Journal of power sources, 2014, Vol.248, p.22-27

Ort / Verlag

Amsterdam: Elsevier

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Microsized single-crystal Li sub(1.08)Mn sub(1.89)Al sub(0.03)O sub(4) (LAMO) was synthesized via polyvinylpyrrolidone (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 super(-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 (D sub(Li+)) was calculated.