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Spontaneous local redox reaction to passivate CNTs as lightweight current collector for high energy density lithium ion batteries

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Journal of Energy Chemistry 2023年第5期80卷 553-561,I0013页

作者： Chao Lv Zhen Tong Shi-Yuan Zhou Si-Yu Pan Hong-Gang Liao Yao Zhou Jun-Tao Li College of Energy Xiamen UniversityXiamen 361005FujianChina State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

Extensive usage of highly conductive carbon materials with large specific surface area(e.g.,carbon nanotubes,CNTs)in lithium ion batteries(LIBs),especially as current collector of anodes,suffers from low initial coulombic efficiency(ICE),large interfacial resistance,and severe embrittlement,as the large specific surface area often results in severe interfacial decomposition of the electrolyte and the formation of thick and fluffy solid electrolyte interphase(SEI)during cycling of LIBs.Herein,we demonstrate that when the CNT-based current collector and Na foil(which are being stacked intimately upon each other)are being placed in Na+-based organic electrolyte,local redox reaction between the Na foil and the electrolyte would occur spontaneously,generating a thin and homogeneous NaF-based Passivating layer on the CNTs.More importantly,we found that owing to the weak solvation behaviors of Na+in the organic electrolyte,the resulting passivation layer,which is rich in NaF,is thin and dense;when used as the anode current collector in LIBs,the pre-existing Passivating layer can function effectively in isolating the anode from the solvated Li+,thus suppressing the formation of bulky SEI and the destructive intercalation of solvated Li+.The relevant half-cell(graphite as anode)exhibits a high ICE of 92.1%;the relevant pouch cell with thus passivated CNT film as current collectors for both electrodes(LiCoO_(2)as cathode,graphite as anode)displays a high energy density of 255 Wh kg^(-1),spelling an increase of 50%compared with that using the conventional metal current collectors.

关键词： Lightweight current collector Passivating layer Initial coulombic efficiency High energy density storage

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Surface Films Formed on SnO_2 Anode in Lithium Secondary Batteries by FTIR Spectroscopy

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Journal of Wuhan University of Technology(Materials Science) 2008年第5期23卷 662-665页

作者：黄峰 Hubei Refractories and High-temperature Ceramics Key Laboratory Wuhan University of Science and Technology

The chemical composition of the Passivating layer formed on nano SnO2 anodes in 1 M LiClO4＋（ethylene carbonate）EC ＋（dimethyl carbonate）DMC at different charge/discharge states in lithium secondary batteries was studied using extra reflectance FTIR spectra. Results show that solvent decomposition reaction that generally occurs on the surface of carbon and alkali metal electrodes also takes place on nano-SnO2 anode, and the major constituent of the Passivating layer is Li2CO3 and ROCO2Li. Formation of the Passivating layer would certainly lead to the irreversible capacity loss.

关键词： nano-SnO2 anode lithium rechargeable batteries FTIR Passivating layer

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