Analytical study of dark spots on anode surface in high energy-density lithium-ion cells

Han, Xiao; Xia, Saisai; Ming-gong, Chen

doi:10.1016/j.tsf.2020.137925

Cited by 2 publications

(1 citation statement)

References 35 publications

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“…XPS analyses of the recovered NCM811 cathodes also provided informative results that explained these behaviors Figure S4): the XPS patterns showed similar C 1s spectra for all NCM811 cathodes; however, the peak intensity associated with C F (291.0 eV, the from PVDF binder used in the NCM811 cathode preparation, not for surface coating) 40,41 was higher for the recovered PVDF-NCM-1 than for the nontreated NCM811, indicating that less electrolyte decomposition occurs in the PVDF-NCM-1. Similar behaviors were observed in the P 2p spectra: the peaks related to Li x PF y (137.3 eV) and Li x PO y F z (135.1 eV) (from electrolyte decomposition) 42,43 were less intense for the PVDF-NCM-1, in agreement with the C 1s spectra which meaning the surface stability was markedly enhanced.…”

Section: Resultssupporting

confidence: 78%

Surface‐Modified Ni‐Rich Layered Oxide Cathode Via Thermal Treatment of Poly(Vinylidene Fluoride) for Lithium‐Ion Batteries

Kang

Seong

et al. 2020

Bulletin Korean Chem Soc

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Combination of poly(vinylidene fluoride) (PVDF) with Ni-rich layered cathode material create artificial cathode-electrolyte interphases by thermal decomposition of PVDF and residual Li + species. The pressure of the cell cycled with PVDF-treated cathode materials is markedly decreased, since the thermal treatment with PVDF selectively reduces the amounts of Li + species. The cycling performance is improved compared to nontreated Ni-rich layered cathodes because the artificial cathode-electrolyte interphases effectively suppress the electrolyte decomposition as determined by systematic characterization of particle hardness, surface morphology, and electrochemical impedance spectroscopy. Additional high temperature storage tests performed with 3450-dimensioned pouch cells indicate much improved recovery rates, as well as smaller open circuit voltage drops, smaller increases in internal resistance, and less swelling for cells cycled with the PVDF-treated Ni-rich layered cathode than with a nontreated Ni-rich layered cathode.

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Section: Resultssupporting

confidence: 78%

Surface‐Modified Ni‐Rich Layered Oxide Cathode Via Thermal Treatment of Poly(Vinylidene Fluoride) for Lithium‐Ion Batteries

Kang

Seong

et al. 2020

Bulletin Korean Chem Soc

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Effect of Humidity on Properties of Lithium-ion Batteries

Han¹

2021

International Journal of Electrochemical Science

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A study was performed to determine the cause of abnormal direct current resistance (DCR) during hightemperature storage of a commercialized lithium-ion battery (1C=50 Ah) designed for an electrical vehicle. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, inductively coupled plasma atomic emission spectroscopy, air permeability measurements and electrochemical impedance spectroscopy were used to analyze batteries with abnormal and normal DCRs. The results of these analyses show that imperfect solid electrolyte interface formation increases the direct current resistance. This imperfection results from the presence of excessive moisture during battery production.

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Analytical study of dark spots on anode surface in high energy-density lithium-ion cells

Cited by 2 publications

References 35 publications

Surface‐Modified Ni‐Rich Layered Oxide Cathode Via Thermal Treatment of Poly(Vinylidene Fluoride) for Lithium‐Ion Batteries

Surface‐Modified Ni‐Rich Layered Oxide Cathode Via Thermal Treatment of Poly(Vinylidene Fluoride) for Lithium‐Ion Batteries

Effect of Humidity on Properties of Lithium-ion Batteries

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