Degradation mechanism of high-voltage single-crystal LiNi0.5Co0.2Mn0.3O2 cathode material

doi:10.1088/1674-1056/ad01a3

摘要/Abstract

摘要： Layered cathode materials have been successfully commercialized and applied to electric vehicles. To further improve improve the energy density of these marterials is still the main efforts in the market. Therefore, developing high-voltage LiNi_xCo_yMn_zO₂ (x+y+z=1, NCM) to achieve high energy density is particularly important. However, under high voltage cycling, NCM often exhibits rapid capacity degradation, which can be attributed to oxygen release, structural phase transition and particle cracking. In this work, the representative single-crystal LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) was studied under various high charge cut-off voltages. Analysis by x-ray diffraction (XRD), transmission electron microscope (TEM) and electron back scatter diffraction (EBSD) measurements indicated that the rock-salt phase is formed on the surface of the particles after high voltage cycling, which is responsible for the increase of impedance and the rapid decay of capacity. Therefore, inhibiting the formation of rock-salt phase is believed an effective strategy to address the failure of NCM under high voltages. These findings provide effective guidance for the development of high-voltage NCM.

关键词: high voltage, Li-ion battery, phase transition, LiNi_xCo_yMn_zO₂

Abstract: Layered cathode materials have been successfully commercialized and applied to electric vehicles. To further improve improve the energy density of these marterials is still the main efforts in the market. Therefore, developing high-voltage LiNi_xCo_yMn_zO₂ (x+y+z=1, NCM) to achieve high energy density is particularly important. However, under high voltage cycling, NCM often exhibits rapid capacity degradation, which can be attributed to oxygen release, structural phase transition and particle cracking. In this work, the representative single-crystal LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) was studied under various high charge cut-off voltages. Analysis by x-ray diffraction (XRD), transmission electron microscope (TEM) and electron back scatter diffraction (EBSD) measurements indicated that the rock-salt phase is formed on the surface of the particles after high voltage cycling, which is responsible for the increase of impedance and the rapid decay of capacity. Therefore, inhibiting the formation of rock-salt phase is believed an effective strategy to address the failure of NCM under high voltages. These findings provide effective guidance for the development of high-voltage NCM.

Key words: high voltage, Li-ion battery, phase transition, LiNi_xCo_yMn_zO₂

中图分类号: (Electrochemistry and electrophoresis)

82.45.-h

82.45.Yz (Nanostructured materials in electrochemistry)

Na Liu(柳娜). Degradation mechanism of high-voltage single-crystal LiNi_0.5Co_0.2Mn_0.3O₂ cathode material[J]. 中国物理B, 2023, 32(12): 128202-128202.

Na Liu(柳娜). Degradation mechanism of high-voltage single-crystal LiNi_0.5Co_0.2Mn_0.3O₂ cathode material[J]. Chin. Phys. B, 2023, 32(12): 128202-128202.

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Degradation mechanism of high-voltage single-crystal LiNi_0.5Co_0.2Mn_0.3O₂ cathode material

Degradation mechanism of high-voltage single-crystal LiNi_0.5Co_0.2Mn_0.3O₂ cathode material

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