Synthesis and Electrochemical Performance of LiMn0.6Fe0.4PO4/C Cathode for Lithium-ion Batteries

doi:10.15541/jim20160408

Abstract

Abstract:

The LiMn_0.6Fe_0.4PO₄/C cathode for lithium-ion batteries (LIBs) was synthesized by solvothermal, ball-milling combined with solid phase calcination method using sucrose as a carbon source and oxalic acid as an antioxidant. The final products with different morphologies were obtained by changing sintering temperatures. The structure and morphology of the target products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Cyclic voltammetry and galvanostatic charge and discharge tests were employed to characterize the electrochemical properties of the samples. The results manifest that well-crystallized olivine structure LiMn_0.6Fe_0.4PO₄/C nano-rods and nano-spindles with no obvious impurity phase are obtained. The spindle-like LiMn_0.6Fe_0.4PO₄/C sample S-650 (which was sintered at 650℃) shows a highly monodisperse and homogeneous morphology. Electrochemical analysis results demonstrate that S-650 exhibits the best electrochemical performance with an initial discharge capacity of 119.1 mAh/g at the current density of 0.2 C (1 C=170 mA/g), and a capacity of 148.8 mAh/g is achieved after 80 charge-discharge cycles, in comparison with S-600 (which was sintered at 600℃) and S-700 (which was sintered at 700℃). Meanwhile, S-650 also demonstrates excellent cycling stability even at a high current density of 2C.

Key words: lithium-ion batteries, LiMn0.6Fe0.4PO4/C, cathode material, electrochemical performance

CLC Number:

TQ174

LI Wei, ZHANG Yuan-Jie, WANG Xuan-Peng, NIU Chao-Jiang, AN Qin-You, MAI Li-Qiang. Synthesis and Electrochemical Performance of LiMn_0.6Fe_0.4PO₄/C Cathode for Lithium-ion Batteries[J]. Journal of Inorganic Materials, 2017, 32(5): 476-482.

Figures/Tables 6

Fig. 1 XRD patterns of products sintered at different temperatures

Fig. 2 SEM images of S-600(a), S-650 (c) and S-700 (e) and corresponding elemental mapping images (b,d,f)

Fig. 3 N2 adsorption-desorption isotherms (a) and pore-size distribution curve (b) of S-650

Fig. 4 CV curves of S-650 at scan rate of 0.1 mV/s (a); Cycling performance of S-650,S-600 and S-700 at 0.2 C rate (b); Rate capabilities of S-650,S-600 and S-700 (c); Cycling performance of S-650 at 0.5 C rate (d); Charge-discharge curves of S-650 at different current densities (e)

Table1 ICP elemental analyses of S-600, S-650 and S-700

Sample	Li	Mn	Fe	P
S-600	0.91	0.59	0.41	1.00
S-650	0.88	0.68	0.43	1.00
S-700	0.90	0.60	0.41	1.00

Fig. 5 Cycling performance (a) and charge-discharge curves (b) of S-650 at 1 C rate; EIS plots of S-650, S-600 and S-700 in the frequency range from 0.01 Hz to 100 kHz (c)

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Synthesis and Electrochemical Performance of LiMn_0.6Fe_0.4PO₄/C Cathode for Lithium-ion Batteries

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