Synthesis of Li2FeP2O7 Cathode Material at Different Temperatures and Its Electrochemical Performance for Lithium Ion Batteries

doi:10.7503/cjcu20200630

Abstract

Abstract:

The cathode material Li₂FeP₂O₇ was synthesized via freeze-drying and followed by solid state sintering method. X-ray diffraction（XRD）， scanning electron microscopy（SEM）， transmission electron microscopy（TEM） and Fourier transform infrared spectroscopy（FTIR） were used to characterize the structure， composition and morphology of the material. In addition， the electrochemical performance of the Li₂FeP₂O₇ material was investigated by cyclic voltammetry（CV） and electrochemical impedance spectroscopy（EIS）. It was found that the greatest particle quality could be acquired when the synthesis temperature of Li₂FeP₂O₇ was 590 ℃. The discharge specific capacity reached 55.0 mA·h·g^?1 at 1.6C， which was much higher than that of the samples synthesized at other temperatures. The Li₂FeP₂O₇ synthesized at 590 ℃ had a low impedance and a large exchange current density， which facilitated the diffusion of lithium ions and improved the electrochemical performance.

Key words: Lithium ion battery, Cathode, Li₂FeP₂O₇, Solid state sintering method

CLC Number:

O646

TrendMD:

WANG Renheng, XIAO Zhe, LI Yan, SUN Yiling, FAN Shuting, ZHENG Junchao, QIAN Zhengfang, HE Zhenjiang. Synthesis of Li₂FeP₂O₇ Cathode Material at Different Temperatures and Its Electrochemical Performance for Lithium Ion Batteries[J]. Chem. J. Chinese Universities, 2021, 42(4): 1299.

Figures/Tables 8

Fig.1 TG?DSC curves of the freeze?dried precursor of Li2FeP2O7(A) and XRD patterns(B) and FTIR spectra(C) of Li2FeP2O7 sintered at 500, 550, 590 and 640 ℃

Fig.2 SEM images of Li2FeP2O7 sintered at temperatures of 500 ℃(A), 550 ℃(B), 590 ℃(C) and 640 ℃(D)

Fig.3 Discharge curves of rate performance of Li2FeP2O7 sintered at temperatures of 500 ℃(A), 550 ℃(B), 590 ℃(C) and 640 ℃(D)

Fig.4 EIS of Li2FeP2O7 cathodes sintered at different temperatures

Table 1 Results of electrochemical impedance and exchange current density

Temperature/℃	R_l/Ω	ω_b/Hz	R_r/Ω	10⁴I₀/(mA·cm^-2)
500	1.695	175.8	225.81	1.14
550	13.04	683.6	71.13	3.61
590	2.504	463.9	85.55	3.00

Fig.5 CV curves of Li2FeP2O7 synthesized at 590 ℃ at a scan rate of 0.1 mV/s

Fig.6 SEM image(A), EDS spectrum(B), and EDS elemental mapping of Fe(C), P(D) and O(E) of Li2FeP2O7 sintered at 590 ℃

Fig.7 TEM images of the Li2FeP2O7 sintered at 590 ℃ with low(A) and high(B) magnifications

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Synthesis of Li₂FeP₂O₇ Cathode Material at Different Temperatures and Its Electrochemical Performance for Lithium Ion Batteries

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