Synthesis and performances of Li+ modified g-C3N4 for PEO-based composite solid electrolyte

doi:10.19799/j.cnki.2095-4239.2022.0345

Abstract

Abstract:

The rich functional groups on the surface of g-C₃N₄ were used for lithiation to acquire lithiated g-C₃N₄ (L-g-C₃N₄). Bistrifluoromethane sulfonimide lithium salt as the lithium salt and polyvinyl epoxide as the polymer matrix was used to prepare L-g-C₃N₄ composite solid electrolytes using the casting-hot-pressing method. Transmission electron microscopy, X-ray diffractometer, infrared spectrometer, differential scanning calorimetry, linear cyclic voltammetry, DC polarization curve, electrochemical impedance spectroscopy and charge-discharge tests were used to characterize and test the composite solid electrolytes. g-C₃N₄ composite solid electrolyte and L-g-C₃N₄ composite solid electrolyte were compared and their electrochemical properties were evaluated. Simultaneously, composite solid electrolytes with different L-g-C₃N₄ content levels were also studied. The results revealed that the composite solid electrolyte's ionic conductivity is 3.95 × 10^-4 S/cm, the Li⁺ migration number is 0.639, and the electrochemical window is higher than 4.5 V. The Li/LiFePO₄ all-solid-state batteries were gathered with composite solid electrolytes. The battery's initial specific discharge capacity was 163.76 mAh/g for the first discharge when charged-discharged with 0.5 C in 2.5-4.0 V at 60 ℃. After 80 cycles, the capacity was still 160.10 mAh/g, and the capacity retention rate was 97.8%.

Key words: Li-ion batteries, PEO-based solid electrolyte, ionic conductivity, carbon nitride (g-C₃N₄)

CLC Number:

TM 912.9

Linsen ZHANG, Shiqi WANG, Lixia WANG, Yanhua SONG. Synthesis and performances of Li⁺ modified g-C₃N₄ for PEO-based composite solid electrolyte[J]. Energy Storage Science and Technology, 2022, 11(11): 3463-3469.

Figures/Tables 11

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References 28

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材料	C_g	CPE-T	CPE-P	R_b	离子电导率/(S/cm)
PEO-LiTFSI	3.330×10^-18	2.767×10^-6	0.80952	702.1	5.14×10^-6
5%-g-C₃N₄	1.835×10^-17	5.273×10^-6	0.89533	23.35	9.81×10^-5
5%-L-g-C₃N₄	6.810×10^-18	1.092×10^-5	0.85373	14.2	2.17×10^-4
10%-L-g-C₃N₄	3.571×10^-16	2.423×10^-5	0.83146	6.3	3.95×10^-4
15%-L-g-C₃N₄	2.174×10^-16	1.341×10^-5	0.85308	16.87	2.16×10^-4

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Synthesis and performances of Li⁺ modified g-C₃N₄ for PEO-based composite solid electrolyte

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