LiFePO4/C Cathode Material Modified by Polyacrylamide

doi:10.15541/jim20150546

Abstract

Abstract:

LiFePO₄/C composite cathode materials containing different amounts of PAM as dispersing agent were synthesized by controlled crystallization-carbon thermal reduction process, to investigate the effect of polyacrylamide (PAM) on the performance of LiFePO₄/C. Crystal structure, surface morphology and electrochemical properties of the obtained composites dispersed by PAM were studied by the techniques including thermal chemical analysis, X-ray diffraction, scanning electron microscopy, carbon content test, constant current charge and discharge testing. The results showed that LiFePO₄material fabricated with 1.5wt%PAM dissolved in acid dispersed more evenly with good flow ability with average particle size of about 100 nm. The first discharge capacities of 1.5wt%PAM-LFP composites were 153.8, 142.5, 138.4, 128.7 and 124.3 mAh/g at 0.1C, 1C, 2C, 5C and 10C ratios, respectively, which capacity retention can keep above 99% at 1C rate after 100 charge/discharge cycles. According to AC impedance spectra measurements, the impedances of 1.5wt%PAM-LiFePO₄ decreased evidently and the diffusion coefficient of Li ions increased by 28 times, indicating that Li ion and electric conductivity, discharge capacity and cycling performance were greatly improved. The above results show that LiFePO₄/C composite cathode materials dispersed by PAM is suitable for industrial applications.

Key words: polyacrylamide, lithium iron phosphate, cathode material

CLC Number:

TQ174

QIN Xian-Zhong, YANG Gai, GAO Jian, CAI Fei-Peng, TAN Chu-Hui. LiFePO₄/C Cathode Material Modified by Polyacrylamide[J]. Journal of Inorganic Materials, 2016, 31(5): 517-522.

Figures/Tables 11

Fig. 1 TG-DTA curves of the precursor

Fig. 2 XRD patterns of FePO4 modified with different contents of PAM

Fig. 3 XRD patterns of LiFePO4 modified with different contents of PAM

Table 1 Carbon contents of PAM-modified LiFePO4 materials

Sample	LFP	0.5wt% PAM-LFP	1.5wt% PAM-LFP	2.5wt% PAM-LFP	5.0wt% PAM-LFP
C/%	4.4029	4.5497	4.5584	4.5668	4.6721

Fig. 4 SEM images for LiFePO4 coated with different PAM contents a-LFP; b-0.5wt%PAM-LFP; c-1.5wtwt%PAM-LFP; d-2.5wt%PAM-LFP; e-5.0wt%PAM-LFP

Fig. 5 Initial charge and discharge curves of LiFePO4 at 0.1C rate

Fig. 6 Cycling performance of LiFePO4 at different rates

Fig. 7 Cycling performance of LiFePO4 at 1C rate

Fig. 8 CV curves of LFP and 1.5wt%PAM-LFP samples

Fig. 9 AC Impedance spectra and equivalent circuit of ACI modeling for samples LFP and 1.5wt%PAM-LFP

Table 2 Fitting results of impedance parameters

	R_s/ (×10, Ω)	R_ct/ (×10², Ω)	σ/ (×10^-4, S•cm^-1)	D_Li+/ (×10^-13, cm²•s^-1)
LFP	7.2	3.7	0.0049	0.35
1.5wt%PAM-LFP	5.8	1.6	1.1000	9.80

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LiFePO₄/C Cathode Material Modified by Polyacrylamide

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