Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 928, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.117047
Keywords
Li -ion battery; MXene; Conductive network; Low temperature; LiFePO4
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In recent years, LiFePO4 (LFP) has been widely used in lithium-ion batteries due to its stability, safety, and low cost. However, its low electronic conductivity restricts its applications at low temperatures or in high power scenarios. In this study, a highly conductive network was fabricated using two-dimensional MXene to improve the conductivity of the LFP cathode. The LFP/MXene/KB electrode exhibited excellent rate performance and low-temperature tolerance, providing practical guidance for the design of LFP with exceptional rate and low-temperature performances.
In recent years, LiFePO4 (LFP) has been widely used as the cathode of lithium-ion batteries due to its excellent stability, safety, and low cost. However, the low electronic conductivity limits its applications at low temper-ature or in high power occasions. Herein, we fabricated a network with excellent electrical conductivity using two-dimensional MXene to improve the poor conductivity of the LFP cathode. Benefited from the hydrophilic-ity of MXene, LFP and MXene were evenly dispersed in the water by ultrasonic treatment and freeze-dried to obtain LiFePO4/MXene (LFP/MXene) powder. Then, Ketjen black (KB) was mixed into the electrode slurry to prevent the restacking of 2D MXene and form a surface-chain conductive network structure. The prepared LFP/MXene/KB electrode exhibits an excellent rate performance (-120 mAh g-1 even at 10 C-rate) at room temperature. Combined with the electrolyte with low de-solvation energy using 1,3-dioxolane as the solvent, the LFP/MXene/KB electrode displays a good low-temperature tolerant performance. Only a weak IR drop can be detected, and about 133 mAh g-1 discharge capacity can be maintained at -40 degrees C and 0.1 C-rate. Both of these provide a practical guidance for the design of LFP with outstanding rate and low-temperature performances.
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