In situ 7Li nuclear magnetic resonance study of the relaxation effect in practical lithium ion batteries

Gotoh, Kazuma; Izuka, Misato; Arai, Juichi; Okada, Yumika; Sugiyama, T.; Takeda, Kazuyuki; Ishida, Hiroyuki

doi:10.1016/j.carbon.2014.07.080

Cited by 50 publications

(55 citation statements)

References 23 publications

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“…This was reported to be originating from LiC 18 as a result of Li intercalation 46 . Then signals for LiC 12 and LiC 6 grew at 43 ppm and 38 ppm, respectively, accompanied by a decrease of LiC 18 . The reverse process occurred during charging and the NMR spectra showed the delithiation of the graphite electrode.…”

Section: Long-run In-operando Nmr Of the Lithium Microstructure Formamentioning

confidence: 97%

“…8d were obtained by peak fitting. Signals of the LiPF 6 and its products in the electrolyte were composed of at least two overlapping resonances between -1 ppm and 2 ppm 18,70 . For the most intensive signal of mobile Li + ions at -0.5 ppm a FWHM of about 150 Hz (less than 1 ppm) was observed.…”

Section: Long-run In-operando Nmr Of the Lithium Microstructure Formamentioning

confidence: 99%

“…In a Li-metal vs. graphite battery Li gets reversibly intercalated into the graphite electrode during discharge and deintercalated during charge 45 . Using 7 Li in-operando NMR the formation of different stages corresponding to LiC 18 , LiC 12 and LiC 6 leads to spectral lines at 13 ppm, 42 ppm and 37 ppm, respectively 18,19,22,[46][47][48] . During charge the Li is deposited in a microstructured morphology on the Limetal electrode 44,49,50 .…”

Section: Introductionmentioning

confidence: 99%

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Long-run in operando NMR to investigate the evolution and degradation of battery cells

Kayser

Mester

Mertens

et al. 2018

Phys. Chem. Chem. Phys.

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To improve the lifetime of lithium-ion batteries, a detailed understanding of the degradation mechanisms is essential. Nuclear magnetic resonance (NMR) is able to unravel the reversible as well as irreversible transient changes of composition, shape and morphology in a battery cell. Using a newly developed cylindrical battery container free of metallic components in combination with a numerically optimized saddle coil, in operando NMR investigations of battery cells over hundreds of charge/discharge cycles are presented. Alternating with NMR data acquisition, electrochemical impedance spectra (EIS) can be recorded, which enables correlative analysis of the two techniques. Long-run in operando NMR measurements on a Li metal vs. graphite cell reveal the formation and evolution of mossy and dendritic Li microstructures over a period of 1000 h, which illustrates the capabilities of NMR to identify dendrite mitigation strategies in cells operated under realistic conditions.

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Section: Long-run In-operando Nmr Of the Lithium Microstructure Formamentioning

confidence: 97%

Section: Long-run In-operando Nmr Of the Lithium Microstructure Formamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-run in operando NMR to investigate the evolution and degradation of battery cells

Kayser

Mester

Mertens

et al. 2018

Phys. Chem. Chem. Phys.

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show abstract

“…It is reported that the lithium plating could be quantified by the intensity of 7 Li signals. Gotoh et al [275] applied in situ 7 Li NMR to research the behavior of deposited lithium when the battery is overcharged. They found that the lithium plating could reinsert into the graphite anode, which provides the theoretical basis for detecting lithium plating by analyzing the voltage plateau after charging mentioned above [275].…”

Section: In Situ/ex Situ Detectionmentioning

confidence: 99%

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

Duan

Tang

Dai

et al. 2019

Electrochem. Energ. Rev.

594

260

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Lithium-ion batteries (LIBs), with relatively high energy density and power density, have been considered as a vital energy source in our daily life, especially in electric vehicles. However, energy density and safety related to thermal runaways are the main concerns for their further applications. In order to deeply understand the development of high energy density and safe LIBs, we comprehensively review the safety features of LIBs and the failure mechanisms of cathodes, anodes, separators and electrolyte. The corresponding solutions for designing safer components are systematically proposed. Additionally, the in situ or operando techniques, such as microscopy and spectrum analysis, the fiber Bragg grating sensor and the gas sensor, are summarized to monitor the internal conditions of LIBs in real time. The main purpose of this review is to provide some general guidelines for the design of safe and high energy density batteries from the views of both material and cell levels.

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“…The in situ NMR characterization of Li plating in single-layer pouch cells comprising actual components of positive electrodes (LiCoO 2 , LiNi x Co y Al z , and LiMn 2 O 4 ) and negative electrodes (graphite and hard carbon) sealed by Al-deposited laminate films was reported recently [74]. A preliminary study revealed that even though the NMR signal of battery components was attenuated by up to 35% to 40% of the original intensity based on RF shielding by the laminate and metallic current collectors, it was still sufficiently strong for practical application.…”

Section: Anodesmentioning

confidence: 99%

Application of Magnetic Resonance Techniques to the In Situ Characterization of Li-Ion Batteries: A Review

2020

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In situ magnetic resonance (MR) techniques, such as nuclear MR and MR imaging, have recently gained significant attention in the battery community because of their ability to provide real-time quantitative information regarding material chemistry, ion distribution, mass transport, and microstructure formation inside an operating electrochemical cell. MR techniques are non-invasive and non-destructive, and they can be applied to both liquid and solid (crystalline, disordered, or amorphous) samples. Additionally, MR equipment is available at most universities and research and development centers, making MR techniques easily accessible for scientists worldwide. In this review, we will discuss recent research results in the field of in situ MR for the characterization of Li-ion batteries with a particular focus on experimental setups, such as pulse sequence programming and cell design, for overcoming the complications associated with the heterogeneous nature of energy storage devices. A comprehensive approach combining proper hardware and software will allow researchers to collect reliable high-quality data meeting industrial standards.

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In situ 7Li nuclear magnetic resonance study of the relaxation effect in practical lithium ion batteries

Cited by 50 publications

References 23 publications

Long-run in operando NMR to investigate the evolution and degradation of battery cells

Long-run in operando NMR to investigate the evolution and degradation of battery cells

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

Application of Magnetic Resonance Techniques to the In Situ Characterization of Li-Ion Batteries: A Review

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