In situ Raman spectroscopy of Li CoO2 cathode in Li/Li3PO4/LiCoO2 all-solid-state thin-film lithium battery

Matsuda, Yusuke; Kuwata, Naoaki; Okawa, Tatsunori; Dorai, Arunkumar; Kamishima, O.; Kawamura, Junichi

doi:10.1016/j.ssi.2019.02.010

Cited by 79 publications

(69 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The A 1 g and E g modes are caused by the vibration of oxygen‐atoms along the c ‐axis and along the a – b plane in the LiCoO 2 lattice, respectively. [ 13 ] As shown in Figure 2a, the A 1 g and E g modes of HT‐LiCoO 2 are observed at 595 and 488 cm −1 , respectively. With increasing proportion of oxygen in the sputter chamber during deposition, an increase in the modes intensity can be observed.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, a change of the absorption coefficient α takes place when the Li/Co ratio is changed. [ 13 ] At a photon energy of 2.41 eV (514 nm), which was used during the Raman experiments, for x = 0.87 and x = 0.53 in Li x COO 2 , the resulting values for α are 0.16 × 10 6 and 0.34 × 10 6 cm −1 , respectively. [ 16 ] The penetration depth of the laser can then be calculated to 62.5 nm for x = 0.87 and 29.4 nm for x = 0.53.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO₂ Thin Films

Michel

Couturier

Becker

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

As known, the rechargeable lithium-ion battery (LIB) is the most representative candidate when it comes to powering portable, electrical devices such as cell phones or laptops. LiCoO 2 proposed by Goodenough et al., was the first commercially used cathode material in such a LIB. Even today, LiCoO 2 is one of the most important cathode materials due to its high energy density (125 Wh kg À1 , 440 Wh l À1), the high reversible capacity (140 mAh g À1), and an achievable battery voltage of over 4 V. [1] However, due to the ever increasing energy needs of humanity, it is important to further increase the energy density and to continue to ensure or even improve the safety of the batteries. These ideas should be satisfied by the so-called all-solid-state-battery (solid-state battery), a battery made entirely of solid-state materials. Easy miniaturization, no leakage of electrolyte or ignition, and prolonged lifetime are the major advantages that result from the use of a solid electrolyte. In recent years, there has been a severe interest in the application of thin-film cathodes in microelectromechanical systems (MEMS), smart cards, or implantable medical devices. For example, a miniaturized solid-state battery should serve as a so-called "on-chip power supply element" and enable a direct emergency power supply. [2] LiCoO 2 is an extremely promising cathode material due to its excellent electrochemical properties. To date, many studies have focused on LiCoO 2 thin-film cathodes fabricated using common techniques such as radio frequency (RF) magnetron sputtering, [3-5] pulsed laser deposition, [6,7] spray methods, [8] sol-gel coating, [9] and chemical vapor deposition. [10,11] LiCoO 2 crystallizes in the rhombohedral high temperature (HT) or cubic low temperature (LT) phase, depending on the manufacturing conditions. In battery applications, the HT phase is preferred because of its suitable electrochemical properties such as increased capacity and better cycle stability compared with the LT phase. Furthermore, there is a desire to obtain the HT-LiCoO 2 film in a suitable orientation in growth direction, as the efficiency of the Li þ diffusion can be further enhanced. An overview of the properties of RF-sputtered LiCoO 2 is given by Julien et al. [12] In this article, we will investigate the deposition of LiCoO 2 thin films via RF magnetron sputtering on heated platinum-coated c-sapphire substrates. Compared with the parameters given by Julien et al., we gain additional information about the thin film using a different substrate and deposition temperature. Structural characterization of the films was carried out as a function of the substrate temperature and the oxygen-to-argon ratio during the deposition. Elemental distribution of atomic compounds near the surface of optimized films was analyzed. Also the electrochemical performance of a LiCoO 2 film was evaluated.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO₂ Thin Films

Michel

Couturier

Becker

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…The battery design was tailored to probe the surfaces of the cathode in contact with the current collector and the electrolyte as shown in Figure 15. [224] With this setup the evolution of the LiCoO 2 Raman modes can be tracked as a function of charge and discharge at the interfaces and then correlated to provide insight into the lithium and charge distribution in the electrode, see Figure 15. [224] These researchers were also able to model how the phase boundary during the two-regions evolved with cycling.…”

Section: Techniques To Probe Microbatteries and Their Interfacesmentioning

confidence: 99%

“…[224] With this setup the evolution of the LiCoO 2 Raman modes can be tracked as a function of charge and discharge at the interfaces and then correlated to provide insight into the lithium and charge distribution in the electrode, see Figure 15. [224] These researchers were also able to model how the phase boundary during the two-regions evolved with cycling. This is a powerful example of the type of scientific questions that can be answered with an optimised cell and analytical technique.…”

Section: Techniques To Probe Microbatteries and Their Interfacesmentioning

confidence: 99%

“…Schematics of the in situ Raman cell designed to determine the evolution of the Raman modes at the two interfaces of the cathode with the evolution during charge shown below. [224] typically reduced while the spinel actually forms a protective layer. [67f] Atomic force microscopy is an interesting tool to explore the surfaces of PLD grown films [227] and in some cases undertake cycling experiments using the tip.…”

Section: Techniques To Probe Microbatteries and Their Interfacesmentioning

confidence: 99%

See 1 more Smart Citation

Pulsed Laser Deposition‐based Thin Film Microbatteries

Fenech

Sharma

2020

Chemistry An Asian Journal

View full text Add to dashboard Cite

Emerging applications for robust small format or distributed devices feature a need for power and rechargeable lithium-ion batteries could play a significant role. This review focuses on a high precision technique to controllably grow thin-film electrodes or full all-solid-state batteries, that is, pulsed laser deposition (PLD). The technique and solidstate batteries are introduced followed by a detailed showcase of the depth of PLD-based growth undertaken on cathodes, electrolytes, anodes and whole microbatteries. Emphasis is placed on the various characterization techniques available to study PLD grown components and devices, and how interfaces become both critical and arguably easier to probe in PLD grown films or devices. This work provides a perspective on the techniques, its opportunities for electrodes and devices, and how to probe the resulting growth and its evolution in batteries.

show abstract

Probing the Self‐Boosting Catalysis of LiCoO₂ in Li–O₂ Battery with Multiple In Situ/Operando Techniques

Gao

Zhou

Ning

et al. 2020

Adv Funct Materials

View full text Add to dashboard Cite

Designing high-activity catalysts and revealing the in-depth structure-property relationship is particularly important for Li-O 2 batteries. Herein, the self-boosting catalysis of LiCoO 2 as an electrocatalyst for Li-O 2 batteries and the investigation of its self-adjustment mechanism using in situ X-ray absorption spectroscopy and other operando characterization techniques is reported. The intercalation/extraction of Li + in LiCoO 2 not only induces the change in Co valence and modulates the electronic/crystal structure but also tunes the surface disorder degree, lattice strain, and local symmetry, which all affect the catalysis activity. In a discharge, highly ordered LiCoO 2 acts as a catalyst to boost oxygen reduction reaction. During charging, the initial extraction of Li + from LiCoO 2 induces Li/oxygen vacancy and Co 4+ , which deforms CoO 6 octahedron as well as lowers the symmetry, and accordingly promotes oxygen evolution reaction. This article offers insights into tuning the activity of catalysts for Li-O 2 batteries with the intercalation/extraction of alkali metal ions in traditional cathodes.

show abstract

In situ Raman spectroscopy of Li CoO2 cathode in Li/Li3PO4/LiCoO2 all-solid-state thin-film lithium battery

Cited by 79 publications

References 36 publications

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO₂ Thin Films

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO₂ Thin Films

Pulsed Laser Deposition‐based Thin Film Microbatteries

Probing the Self‐Boosting Catalysis of LiCoO₂ in Li–O₂ Battery with Multiple In Situ/Operando Techniques

Contact Info

Product

Resources

About

In situ Raman spectroscopy of Li CoO2 cathode in Li/Li3PO4/LiCoO2 all-solid-state thin-film lithium battery

Cited by 79 publications

References 36 publications

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO2 Thin Films

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO2 Thin Films

Pulsed Laser Deposition‐based Thin Film Microbatteries

Probing the Self‐Boosting Catalysis of LiCoO2 in Li–O2 Battery with Multiple In Situ/Operando Techniques

Contact Info

Product

Resources

About

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO₂ Thin Films

Structural and Electrochemical Characterization of Radio Frequency Magnetron‐Sputtered LiCoO₂ Thin Films

Probing the Self‐Boosting Catalysis of LiCoO₂ in Li–O₂ Battery with Multiple In Situ/Operando Techniques