In situ conductivity measurements of LiMn 2 O 4 thin films during lithium insertion/extraction by using interdigitated microarray electrodes

Yamamura, Satoru; Koshika, Hiromichi; Nishizawa, Masatoyo; Matsue, Tomokazu; Uchida, Isamu

doi:10.1007/s100080050090

Cited by 30 publications

(29 citation statements)

References 1 publication

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“…Similar conductivity characteristics for the spinel LiMn 2 O 4 have been indicated in literature accounts (2) . The spinel has been found to have semiconducting properties for the useful operating voltage ranging from ~2.4 x 10 -5 S/cm at 3.5 V to ~1.3 x 10 -5 S/cm at 4.2 V (vs. lithium), with no transition to metallic conductivity as observed for LiCo 2 O 4 and some of the other lithium spinels like LiTi 2 O 4 and LiV 2 O 4 .…”

Section: Conductivity Issuessupporting

confidence: 87%

Nanowire Cathode Material for Lithium-Ion Batteries

Olson¹

2004

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Section: Conductivity Issuessupporting

confidence: 87%

Nanowire Cathode Material for Lithium-Ion Batteries

Olson¹

2004

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“…All data were acquired in random order of E eq (or x) in 1.0 M LiClO 4 in dry acetonitrile. Also shown are conductivity data reported previously for Li x MnO 2 films by Chen et al,26 Uchida et al,24,25 and Kanoh et al,27 who reported ionic, not electronic, conductivity values.…”

mentioning

confidence: 74%

“…This is a factor of 25 higher than the in situ conductivity reported by Uchida et al for spinel films of Li x MnO 2 . 24,25 Second, the conductivity change for nanowires as a function of x is greater in absolute terms than seen previously for films. Finally, we observe a strong dependence of σ on the nanowire width at constant nanowire height: Increasing the nanowire width reduces σ for all values of x while also dramatically reducing the degree to which σ is modulated by x.…”

Section: ■ Introductionmentioning

confidence: 86%

In Situ Electrical Conductivity of Li_xMnO₂ Nanowires as a Function of x and Size

Le¹,

Liu²,

Wang

et al. 2015

Chem. Mater.

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Manganese oxide, MnO 2 , excels as a hybrid electrical energy storage material: The manganese centers in MnO 2 are capable of undergoing a reduction from 4+ to 3+ balanced by the intercalation of lithium ions to form Li x MnO 2 while its conductive surfaces simultaneously store energy as an electrical double layer capacitor. The highest capacitance and power performance for MnO 2 has been obtained for ensembles of nanowires that are 200 nm or less in width and many microns in length. Typically such MnO 2 nanowires are attached to a current collector at just one end, and electrical conductivity of the nanowire is therefore required in order to maintain a consistent redox and charge state along its axis. The electrical conductance of the nanowire therefore plays a very important role, and yet this parameter has been measured in few previous studies. In this work, we directly measure the electrical conductance of δ-MnO 2 nanowires in situ in 1 M LiClO 4 , acetonitrile as a function of the equilibrium Li content for nanowires with varying lateral dimensions. This measurement is accomplished using arrays of 200 MnO 2 nanowires that are 40−60 nm in height and 275−870 nm in width and which span a 10 μm gap between two gold contacts. Nanowires of fully oxidized MnO 2 are first prepared at +0.60 V vs MSE in acetonitrile. As the equilibrium electrode potential is decreased from 0.60 V to −0.80 V and lithium is intercalated, the electrical conductivity of MnO 2 nanowires increases by up to 1 order of magnitude. The measured change in conductivity is dependent on the equilibrium potential, which in turn is related to the Li content, and also depends on the width of nanowires. After doping at −0.80 V vs MSE, the conductivity increases by 30% for a 870 nm wide nanowire array and 880% for a 275 nm wide nanowire array. TEM investigations implicate the nanowire porosity in this difference.

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“…Nonetheless, it is important to emphasize that this technique can be used for the characterization of other conductive or semiconductor materials. For example, it has been used for the in‐situ conductivity measurements during the Li insertion/extraction process in different Li insertion electrodes for Li secondary batteries …”

Section: Chemical Aspects Related To In Situ Electrochemical‐conductamentioning

confidence: 99%

Analysis of Conjugated Polymers Conductivity by in situ Electrochemical‐Conductance Method

Salinas

Frontana‐Uribe

2019

ChemElectroChem

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The in situ electrochemical‐conductance method is presented as an important electrochemical characterization tool for gaining insight into the chemical and electrical behavior of π‐conjugated polymers and electroactive materials. Important information about conductivity models, the type of charge carrier, and the carrier‐transport pathways as well as explanations of different phenomena related to charge and mass transport can be extracted from the obtained analyses. Using conveniently modified polymers, this method enables the development of a wide range of conductometric sensory devices. This Minireview summarizes the historical development of the in situ electrochemical‐conductance method, describes the systems used, explains details of the calculations, and discusses recent advances and applications.

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In situ conductivity measurements of LiMn 2 O 4 thin films during lithium insertion/extraction by using interdigitated microarray electrodes

Cited by 30 publications

References 1 publication

Nanowire Cathode Material for Lithium-Ion Batteries

Nanowire Cathode Material for Lithium-Ion Batteries

In Situ Electrical Conductivity of Li_xMnO₂ Nanowires as a Function of x and Size

Analysis of Conjugated Polymers Conductivity by in situ Electrochemical‐Conductance Method

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In situ conductivity measurements of LiMn 2 O 4 thin films during lithium insertion/extraction by using interdigitated microarray electrodes

Cited by 30 publications

References 1 publication

Nanowire Cathode Material for Lithium-Ion Batteries

Nanowire Cathode Material for Lithium-Ion Batteries

In Situ Electrical Conductivity of LixMnO2 Nanowires as a Function of x and Size

Analysis of Conjugated Polymers Conductivity by in situ Electrochemical‐Conductance Method

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In Situ Electrical Conductivity of Li_xMnO₂ Nanowires as a Function of x and Size