High-Speed voltammetry of Mn-doped LiCoO 2 using a microelectrode technique

Waki, Shinichi; Dokko, Kaoru; Itoh, Takashi; Nishizawa, Matsuhiko; Abe, Takayuki; Uchida, Isamu

doi:10.1007/s100080050196

Cited by 44 publications

(23 citation statements)

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“…7 Using this method they could obtain the trustable results free from the influence associated with the above-mentioned interference problems. Instead, use of CF is so simple for realizing a similar condition that enables us to obtain trustable results on carbonaceous materials with ease.…”

Section: Determination Of Diffusion Rate Of LI In Carbonmentioning

confidence: 99%

Characterization of Carbonaceous Active Materials Used for the Negative Electrode of Li-Ion Batteries and Capacitors

Takamura

2012

Electrochemistry

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During the course of investigating carbonaceous materials for the active materials of Li-ion batteries (LIB) or supercapacitors (SPC) we have found interesting properties and behaviors of the carbon in contact with an electrolyte containing Li + . In this article the author would like to exhibit these attractive matters. Especially use of carbon fiber (CF) attracted our attention since we can use a single fiber as the working electrode, which enables us to measure not only the conductivity change but also the volume change during Li insertion/extraction. Determination of the lithium diffusion coefficient in carbon could be performed with ease. Surprisingly propylene carbonate showed no decomposition during cathodic polarization of graphite in propylene carbonate electrolyte when we use a single graphitzed fiber. On the other hand, by the use of rounded graphite particle we suggested presence of holes on the graphene layer. We proved that homogeneous distribution of conductivity over the surface of coated electrode is the key factor to keep long cycle life.

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Section: Determination Of Diffusion Rate Of LI In Carbonmentioning

confidence: 99%

Characterization of Carbonaceous Active Materials Used for the Negative Electrode of Li-Ion Batteries and Capacitors

Takamura

2012

Electrochemistry

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“…In most cases, the kinetic studies have been performed assuming a diffusion control concept [45][46][47][48][49][50][51][52], namely, that the diffusion of lithium in the electrode is very sluggish, whereas other reactions (including interfacial charge transfer) are too fast to affect the kinetics of lithium transport. Hence, lithium diffusion in the electrode would become a rate-controlled process of lithium intercalation.…”

Section: Kinetics Of Intercalation and Deintercalationmentioning

confidence: 99%

“…Using Equations (5.18) and (5.19), a number of PCTs have been analyzed. The slopes of the I(t) versus t À1/2 and ln I(t) versus t curves have been determined in the initial and later stages of lithium intercalation/deintercalation, respectively, to estimate the chemical diffusivity in various lithium intercalation electrodes [45][46][47][48][49][50][51][52]. As discussed in Section 5.3, however, various types of anomalous behavior of lithium transport have been reported in PCTs measured for many transition metal oxides and carbonaceous materials [53][54][55][56][57][58][59][60][61][62][63].…”

Section: Potentiostatic Current Transient Techniquementioning

confidence: 99%

The Fundamentals and Advances of Solid‐State Electrochemistry: Intercalation (Insertion) and Deintercalation (Extraction) in Solid‐State Electrodes

Kim

Lee

Pyun

2009

Solid State Electrochemistry I

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Over several decades, solid-state electrodes in which reversible intercalation (insertion) and deintercalation (extraction) of cationic guest atoms occur along with accompanying electron flow without any change of their crystal structure, have attracted great interest in fundamental and practical perspectives for improving the performance of rechargeable batteries. This chapter provides comprehensive reviews of principle and recent advances especially in thermodynamic and kinetic approaches to lithium intercalation into, and deintercalation from, transition metals oxides and carbonaceous materials. Thermodynamic properties such as chemical potential, entropy and enthalpy of lithium intercalation/deintercalation are first discussed, based on a lattice gas model with various approximations. Lithium intercalation/deintercalation involving an order-disorder transition or a two-phase coexistence caused by strong interaction of lithium ions in solid-state electrodes is explained, based on the lattice gas model and with the help of computational methods. Second, the kinetics of lithium intercalation/ deintercalation is treated in detail on the basis of a cell-impedance-controlled model. Anomalous features of potentiostatic current transients obtained experimentally from transitional metal oxide and carbonaceous electrodes, which are hardly explained under a diffusion control model, are readily analyzed by the cell-impedancecontrolled lithium transport concept, with the aid of computational methods. IntroductionWhen cationic guest atoms such as lithium, hydrogen, and sodium reversibly enter or leave the host oxide crystal, along with an accompanying electron flow but without any change in crystal structure, the reaction is referred to as intercalation/ deintercalation as follows [1,2]::1Þ Solid State Electrochemistry I: Fundamentals, Materials and their Applications. Edited by Vladislav V. Kharton

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“…Waki, 2000. Ancak bu çalışmalarda daha ziyade Mn katkısının pil performansına etkileri üzerinde durulmuş ancak katkılamanın yapıyı ve morfolojik özellikleri nasıl etkilediği üzerinde detaylı şekilde durulmamıştır veya Mn katkılaması üzerine yapının nasıl değiştiği konusunda çelişkili bilgiler mevcuttur (Waki, 2000. Stoyanova, 1994.…”

Section: Introductionunclassified

Effects of Mn Substitution on the structure and morphology of LiCoO2 Cathode Active Material

Aslan¹,

Ateş²,

Gözüaçık³

et al. 2015

AKU-J. Sci. Eng.

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Anahtar kelimeler AbstractWith the rapid increase in the number of mobile phones and portable electronic devices in our daily life, researchers have focused on high energy density, light weight and compact rechargeable batteries. In this report, effects of Mn substitution on structural and morphological properties of LiCoO2 which is one of the well-known cathode materials for Li-ion batteries were investigated. LiCo1-xMnxO2 compounds with x=0.1 intervals were synthesized via solid state reactions technique. Structural and morphological properties of the samples are investigated via XRD and SEM. Based on our studies; we found that in 0≤x≤0.2 samples, LiCoO2 phase is the stable phase. As the Mn content increases, other phases such as Li2MnO3 and spinel LiMn2O4emerge.

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High-Speed voltammetry of Mn-doped LiCoO 2 using a microelectrode technique

Cited by 44 publications

References 0 publications

Characterization of Carbonaceous Active Materials Used for the Negative Electrode of Li-Ion Batteries and Capacitors

Characterization of Carbonaceous Active Materials Used for the Negative Electrode of Li-Ion Batteries and Capacitors

The Fundamentals and Advances of Solid‐State Electrochemistry: Intercalation (Insertion) and Deintercalation (Extraction) in Solid‐State Electrodes

Effects of Mn Substitution on the structure and morphology of LiCoO2 Cathode Active Material

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