Effect of flame-retarding additives on surface chemistry in Li-ion batteries

Nam, Nguyễn Đăng; Park, I.J.; Kim, J.G.; Kim, H.S.

doi:10.1016/j.materresbull.2012.04.045

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…FRM additives have many applications in various composite products, such as the insulation of black boxes for flight data recorders and aircraft coatings [3], communication and electrical cables [4], furniture and coatings for various wood products [3], mining and transportation equipment [4], polymer coatings for corrosion protection of metals [4], wind turbines [5], asphalt binders [6], papers [7], thermoplastics, thermosets, and flame-resistant fabrics [4]. FRMs are gaining increasing attention for the development of composites for advanced energy generation devices [8,9]. FRMs are mandatory components of various building product composites, such as wall and ceiling linings; fabrics for office and residential buildings [4]; fire blankets [4]; theatre curtains; and a large variety of consumer products, including window blinds, electrical appliances, furniture, and children's toys [10].…”

Section: Introductionmentioning

confidence: 99%

Poly(ethyl methacrylate) Composite Coatings Containing Halogen-Free Inorganic Additives with Flame-Retardant Properties

et al. 2022

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This investigation is motivated by the need for the development of polymer coatings containing inorganic flame-retardant materials (FRMs) and the replacement of toxic halogenated FRMs. A green strategy is reported for the fabrication of poly(ethyl methacrylate) (PEMA)-FRM composite coatings using a dip-coating method. The use of water-isopropanol co-solvent allows the replacement of regular toxic solvents for PEMA. The abilities to form concentrated solutions of high-molecular-mass PEMA and to disperse FRM particles in such solutions are the main factors in the fabrication of coatings using a dip-coating technique. Huntite, halloysite, and hydrotalcite are used as advanced FRMs for the fabrication of PEMA-FRM coatings. FTIR, XRD, SEM, and TGA data are used for the analysis of the microstructure and composition of PEMA-FRM coatings. PEMA and PEMA-FRM coatings provide corrosion protection of stainless steel. The ability to form laminates with different layers using a dip-coating method facilitates the fabrication of composite coatings with enhanced properties.

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Section: Introductionmentioning

confidence: 99%

Poly(ethyl methacrylate) Composite Coatings Containing Halogen-Free Inorganic Additives with Flame-Retardant Properties

et al. 2022

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“…The performance of lithium ion batteries (LIBs) like conductivity and stability depends on the surface chemistry of electrodes. Additives in electrodes of LIBs play essential roles in controlling the surface chemistry . For example, poly(vinylidene fluoride) (PVDF), one of the most important adhesives, is commonly added into LIB cathodes to enhance the connection between active particles.…”

Section: Introductionmentioning

confidence: 99%

XPS study on the STOBA coverage on Li(Ni_0.4 Co_0.2 Mn_0.4 )O₂ oxide in pristine electrodes

Chang

Lin

et al. 2017

Surf Interface Anal

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The additive of self-terminated oligomers with hyper-branched architecture (STOBA) in Li(Ni 0.4 Co 0.2 Mn 0.4 )O 2 (LNCM) cathodes of lithium ion batteries improves the battery stability and capacity. In this study, the surface chemistry of pristine LNCM electrodes with and without the STOBA additive was analyzed by means of X-ray photoelectron spectroscopy and the surface morphology was observed by scanning electron microscopy. It was found that STOBA covers LNCM particles uniformly and the formation of chemical bonding between nitrogen atoms in STOBA and metallic atoms in LNCM was discovered. This bonding may cause the uniform coverage of STOBA on LNCM. The formation of STOBA layer on LNCM improves the coverage of the binder poly(vinylidene fluoride) and inhibits the formation of LiF. KEYWORDS cathode, Li(Ni 0.4 Co 0.2 Mn 0.4 )O 2 , lithium ion batteries, STOBA, XPS 1 | INTRODUCTION The performance of lithium ion batteries (LIBs) like conductivity and stability depends on the surface chemistry of electrodes. Additives in electrodes of LIBs play essential roles in controlling the surface chemistry. 1,2 For example, poly(vinylidene fluoride) (PVDF), one of the most important adhesives, 3 is commonly added into LIB cathodes to enhance the connection between active particles. The C─F ionic bonds in PVDF has evident dipole configuration that induces a strong intermolecular van der Waals force. The improved connection leads to better electrical and ionic conductivities. The investigation of the chemical state of atoms on the surface of electrodes with some additive is essential for inferring the cause of effect of the additive on the performance of LIBs.Just recently, a kind of chemicals called self-terminated oligomers with hyper-branched architecture (STOBA) 4 added in cathodes was found to promisingly enhance the safety of LIBs. [5][6][7] However, no study has been reported on the STOBA coverage on the electrodes. Recently, we have chemically analyzed the surface of Li(Ni 0.4 Co 0.2 Mn 0.4 )O 2 (LNCM) pristine cathodes without and with STOBA additive by means of X-ray photoelectron spectroscopy (XPS). In this paper, we report these results, compare them with SEM observations, and discuss the effects of PVDF and STOBA additives on the surface coverage of LNCM cathodes. | EXPERIMENTAL PROCEDURESThe LNCM cathodes were prepared using the following procedures and were handled in an oxygen-free glove box with an oxygen limit of 10 ppm. For cathodes without STOBA (LNCM + PVDF), LNCM powder produced by Industrial Technology Research Institute (ITRI) and PVDF (produced by KUREHA Chemical) were mixed in N-methyl pyrolidine (NMP) solvent. The suspension was stirred for 15 minutes.Conductive agents including KS6 (graphite plates, TIMCAL) and super P (carbon black particles, TIMCAL) were added to the suspension and stirred a further 15 minutes. The mass percentages of LNCM, PVDF, and conductive agents are 89%, 4%, and 7%, respectively. The mixed cathode slurry was coated on aluminum substrates and dried. For the cathode with t...

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Temperature and potential dependence electrochemical impedance studies of LiMn2O4

et al. 2013

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Effect of flame-retarding additives on surface chemistry in Li-ion batteries

Cited by 8 publications

References 18 publications

Poly(ethyl methacrylate) Composite Coatings Containing Halogen-Free Inorganic Additives with Flame-Retardant Properties

Poly(ethyl methacrylate) Composite Coatings Containing Halogen-Free Inorganic Additives with Flame-Retardant Properties

XPS study on the STOBA coverage on Li(Ni_0.4 Co_0.2 Mn_0.4 )O₂ oxide in pristine electrodes

Temperature and potential dependence electrochemical impedance studies of LiMn2O4

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Effect of flame-retarding additives on surface chemistry in Li-ion batteries

Cited by 8 publications

References 18 publications

Poly(ethyl methacrylate) Composite Coatings Containing Halogen-Free Inorganic Additives with Flame-Retardant Properties

Poly(ethyl methacrylate) Composite Coatings Containing Halogen-Free Inorganic Additives with Flame-Retardant Properties

XPS study on the STOBA coverage on Li(Ni0.4 Co0.2 Mn0.4 )O2 oxide in pristine electrodes

Temperature and potential dependence electrochemical impedance studies of LiMn2O4

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XPS study on the STOBA coverage on Li(Ni_0.4 Co_0.2 Mn_0.4 )O₂ oxide in pristine electrodes