Reversible and High‐Capacity Nanostructured Electrode Materials for Li‐Ion Batteries

Kim, Min; Cho, Jaephil

doi:10.1002/adfm.200801095

Cited by 475 publications

(375 citation statements)

References 135 publications

(148 reference statements)

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“…Since X-ray absorption spectroscopy (XAS) is a powerful tool to probe the electronic and local structure of electrodes, XAS can be effectively used for the local structural refinement during electrochemical reaction of electrodes in LIB. 7 For example, an oxidation state of an active material in an electrode can be quantitatively determined by X-ray absorption near edge structure (XANES) analysis, and structural parameters such as interatomic distances, coordination numbers, and Debye-Waller factors can be also explored by the extended X-ray absorption fine structure (EXAFS).…”

Section: Introductionmentioning

confidence: 99%

In Situ X-ray Absorption Spectroscopic Study for α-MoO₃Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

Kang¹,

Paek²

2010

Bulletin of the Korean Chemical Society

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In-situ X-ray absorption spectroscopy (XAS) was used to elucidate the structural variation of α-MoO3 electrode upon discharge/charge reaction in a lithium ion battery. According to the XAS analysis, hexavalent Mo atoms in α-MoO3 framework are reduced as the amount of intercalated lithium ions increases. As lithium de-intercalation proceeds, most of pre-edge peaks are restored again. However, according to the Fourier transforms of the extended X-ray absorption fine structure (EXAFS) spectra, lithium de-intercalation reaction is partially irreversible upon the charge reaction, which is one of the main reasons why the capacity of α-MoO3 electrode decreases upon successive discharge/charge cycles.

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Section: Introductionmentioning

confidence: 99%

In Situ X-ray Absorption Spectroscopic Study for α-MoO₃Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

Kang¹,

Paek²

2010

Bulletin of the Korean Chemical Society

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“…[8][9][10][11][12] Within this materials' class a particular focus was, so far, set on Fedoped ZnO with a Zn:Fe ratio of 9:1, providing a theoretical specific capacity of 966 mAh g -1 . 8,9,12 While the nanoparticulate nature of these particles, originating from the utilization of sucrose as sterically shielding chelating agent, 8,13 allows for shorter ion and electron transport pathways as well as decreased mechanical strain upon volume variation, [14][15][16][17][18][19][20][21][22][23] the enlarged electrode/electrolyte interface also results in an increased incidence of parasitic side reactions with a detrimental impact on the de-/lithiation mechanism. 17,19,[23][24][25][26] One approach to overcome this latter issue is the application of a carbonaceous coating, simultaneously stabilizing the electrode/electrolyte interface by forming a suitable solid electrolyte interphase (SEI), enhancing the electronic conductivity within the electrode composite, buffering the occurring volume changes, and preventing particle agglomeration upon electrode fabrication and cycling.…”

mentioning

confidence: 99%

Iron-Doped ZnO for Lithium-Ion Anodes: Impact of the Dopant Ratio and Carbon Coating Content

Mueller

Gutsche

Nirschl

et al. 2016

J. Electrochem. Soc.

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Herein, an investigation of the impact of the dopant and carbon content in iron-doped zinc oxide/carbon composites is presented. For this purpose, a comprehensive morphological, structural, and electrochemical characterization of a series of different compounds is reported, including techniques like X-ray diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP-OES), thermogravimetric analysis (TGA), specific surface area using the Brunauer-EmmettTeller (BET) algorithm, pycnometry, small-angle X-ray scattering (SAXS), cyclic voltammetry (CV), and galvanostatic cycling. The obtained results reveal an impact of the iron-dopant content on the crystallite and particle size as well as the detailed de-/lithiation mechanism. The effect on the cycling stability, however, appears to be rather minor. The carbon coating content, on the contrary, has a significant influence on the cycling stability and rate capability. According to these results, a carbon content of about 10 wt% is sufficient to achieve stable cycling at lower current densities, while a carbon content of 15-20 wt% allows for specific capacities of 425-500 mAh g −1 , when applying a specific current of 1 A g −1 , for instance. Despite the tremendous commercial success of lithium-ion batteries for a wide variety of applications -ranging from small-scale portable electronics to electric bikes and scooters and, recently, electric vehicles -further enhanced energy and power densities are needed for the realization of a fully electrified public and private transport. [1][2][3][4] While optimized cell designs and battery engineering have a great impact on such improvement, the next great leap forward will require the implementation of new battery chemistries. With regard to the anode side, most research activities within the past years have focused on replacing graphite by alloying or conversion materials, which commonly allow for substantially higher specific capacities. [5][6][7] However, both material classes suffer intrinsic challenges like dramatic volume variations upon de-/lithiation (particularly in case of alloying materials) and relatively wide lithium reaction potentials, accompanied by a substantial voltage hysteresis between charge and discharge (especially in case of conversion materials), resulting in rapid capacity fading of the corresponding electrodes, comparably lower specific energies, and improvable energy storage efficiencies, respectively. [5][6][7] In an attempt to overcome these challenges, we have recently reported a new class of materials -transition metal-doped metal oxides -for which the reduced transition metal (i.e., upon lithiation) enables the reversible formation of Li 2 O, i.e., the conversion reaction. Additionally, the metal itself can form a lithium alloy. [8][9][10][11][12] Within this materials' class a particular focus was, so far, set on Fedoped ZnO with a Zn:Fe ratio of 9:1, providing a theoretical specific capacity of 966 mAh g -1 . 8,9,12 While the nanopart...

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“…In the Li-ion batteries, LiCoO 2 , LiNiO 2 , LiFePO 4 and LiMn 2 O 4 are considered most important cathode materials [1,2]. Unlike LiCoO 2 , LiNiO 2 and LiFePO 4 , spinel LiMn 2 O 4 has become promising energy source and does not contain heavy metals to dispose after usage [3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated LiMn₂O₄/MWCNT Nanocomposite Cathodes

Akbulut¹,

Çetinkaya²,

Guler³

et al. 2014

Acta Phys. Pol. A

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In this study, it is aimed to develop LiMn2O4/MWCNT nanocomposite cathode materials by using dierent calcination temperatures (300, 500, 700• C). The aim of using MWCNTs in the active material is to overcome poor conductivity and to increase stability of the electrodes during charging and discharging. The nanocomposites were produced by solgel method, which allows producing very ne particle size of LiMn2O4. LiMn2O4 and LiMn2O4/ MWCNT were uniformly coated on an Al-foil to obtain 500 µm thicknesses with a specic amount of binder and conducting agent. The surfaces of cathodes were coated with ZnO by using magnetron sputtering PVD with a thickness of 10 nm. Coin-type (CR2016) test cells were assembled, directly using the LiMn2O4/MWCNTs and surface coated LiMn2O4/MWCNTs as anode and a lithium metal foil as the counter electrode.

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Reversible and High‐Capacity Nanostructured Electrode Materials for Li‐Ion Batteries

Cited by 475 publications

References 135 publications

In Situ X-ray Absorption Spectroscopic Study for α-MoO₃Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

In Situ X-ray Absorption Spectroscopic Study for α-MoO₃Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

Iron-Doped ZnO for Lithium-Ion Anodes: Impact of the Dopant Ratio and Carbon Coating Content

The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated LiMn₂O₄/MWCNT Nanocomposite Cathodes

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Reversible and High‐Capacity Nanostructured Electrode Materials for Li‐Ion Batteries

Cited by 475 publications

References 135 publications

In Situ X-ray Absorption Spectroscopic Study for α-MoO3Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

In Situ X-ray Absorption Spectroscopic Study for α-MoO3Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

Iron-Doped ZnO for Lithium-Ion Anodes: Impact of the Dopant Ratio and Carbon Coating Content

The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated LiMn2O4/MWCNT Nanocomposite Cathodes

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In Situ X-ray Absorption Spectroscopic Study for α-MoO₃Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

In Situ X-ray Absorption Spectroscopic Study for α-MoO₃Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated LiMn₂O₄/MWCNT Nanocomposite Cathodes