Preparation and characterization of solvent-free dry electrodes for lithium ion batteries

doi:10.19799/j.cnki.2095-4239.2021.0081

Abstract

Abstract:

LiNi_0.8Co_0.1Mn_0.1O₂ dry electrodes for lithium-ion batteries were prepared using a solvent-free electrode preparation technology. The morphology and elemental distribution of the dry electrodes were analyzed using a scanning electron microscope and an X-ray energy spectrometer (EDS). The electrochemical performance of LiNi_0.8Co_0.1Mn_0.1O₂ dry electrodes were characterized by the rate of charge/discharge, electrochemical impedance spectroscopy, and cycle charge/discharge. The results show that in the dry electrodes, PTFE fibers are widely distributed around the LiNi_0.8Co_0.1Mn_0.1O₂ particles, which form a dense, complete, and flexible net-like binding structure. Batteries containing the dry electrodes delivered an excellent capacity retention of 94.89% for more than 500 cycles, which is much greater than that of traditional wet-coated electrodes. Inside the dry electrodes after 500 cycles, a stable net-like binding structure was maintained, and there were significantly less cracks on the surface of the LiNi_0.8Co_0.1Mn_0.1O₂ particles than on the wet-coated electrodes. These results indicate that the three-dimensional net-like binding structure formed by PTFE fibers can effectively improve the anti-deterioration performance of the electrodes. No solvents were used in the preparation of the dry electrodes, which can reduce the amount of raw materials and energy consumption, and thus be environmentally friendly. The solvent-free electrode preparation technology provides many practical applications in the preparation of thick electrodes to i ncrease the energy density of lithium-ion batteries.

Key words: solvent-free dry electrodes, free-standing films, PTFE fibration, lithium ion batteries

CLC Number:

TQ 152

Dechao GUO, Yimin GUO, Qiwen ZHANG, Xiangyun CI, Fengrong HE. Preparation and characterization of solvent-free dry electrodes for lithium ion batteries[J]. Energy Storage Science and Technology, 2021, 10(4): 1311-1316.

Figures/Tables 8

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