Electrochemical and Structural Properties of xLi2M‘O3·(1−x)LiMn0.5Ni0.5O2 Electrodes for Lithium Batteries (M‘ = Ti, Mn, Zr; 0 ≤ x ⩽ 0.3)

Kim, Jeom Soo; Johnson, Christopher; Vaughey, John T.; Thackeray, Michael M.; Hackney, S.A.; Yoon, Won‐Sub; Grey, Clare P.

doi:10.1021/cm0306461

Cited by 498 publications

(280 citation statements)

References 34 publications

Supporting

Mentioning

270

Contrasting

Unclassified

Order By: Relevance

“…8,9 The XRD patterns presented in Fig. 2 indicate that the surface-modification using a simple wet-coating method does not cause a prominent bulk change of the parent OLO powders.…”

Section: Resultsmentioning

confidence: 94%

See 1 more Smart Citation

Surface Modification of Over-Lithiated Layered Oxides with PEDOT:PSS Conducting Polymer in Lithium-Ion Batteries

Lee

Choi

2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

Over-lithiated layered oxide (OLO) materials were coated with a PEDOT:PSS conducting polymer via a simple wet-coating method. The prepared samples were observed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The electrochemical properties of the samples were determined by galvanostatic testing and electrochemical impedance spectroscopy (EIS). PEDOT:PSS coated cathode materials showed better rate capability and cyclability between 2.0 V and 4.6 V. X-ray photoelectron spectroscopy (XPS) data imply that the improved electrochemical performance of coated OLO is due to the suppression of the formation and growth of the solid electrolyte interface. 1-7 Among the many candidates, over-lithiated layered oxide (OLO), reported by the Thackeray group in 2005, exhibits a higher capacity (>200 mAh/g) and can reduce the use of expensive cobalt. Therefore, OLO is receiving attention as a cathode material for lithium-ion batteries (LIBs). 8,9 However, OLO experiences an inevitable oxygen loss and, subsequently, an irreversible capacity during the initial charge and discharge process. Additionally, the layered structure of OLO transforms into the spinel phase on cycling. The Li 2 MnO 3 phase in OLO materials exhibits a relatively low electronic conductivity owing to the insulating characteristics of the Li 2 MnO 3 component. 8,9 Referring to the reports by the Thackeray group, OLO material properties such as particle size, morphology control, compositional control by cationic substitution, and surface modification of parent OLO materials have been investigated to improve electrochemical properties. [10][11][12][13][14][15][16] Among the various researches published, investigations of surface modification mostly aim to decrease the initial irreversible capacity at initial cycles and suppress the side reaction between the cathode and electrolyte. Most materials for surface modification can be categorized into three groups: inorganic oxides, carbonbased materials, and polymer-based materials. The inorganic materials, which include AlF 3 , AlPO 4 , CoPO 4 , TiO 2 , V 2 O 5 , Al 2 O 3 , MnO 2 , ZnO, ZrO, MgO, Sm 2 O 3 , Li-Mn-PO 4 , and Li-Ni-PO 4 , are known to decrease the irreversible capacity and improve the electrochemical performances of OLO materials owing to the enforcement of stability on the surface in the high-voltage region. 17-31The carbon materials, including graphene-based materials, are employed to improve the electronic conductivity of OLO cathode materials.19,32-34 Also, surface modification by conducting polymers, such as polypyrrole, has been recently reported to provide improved electronic conductivity as well as a thin protective layer on OLO cathode materials. 35 Among various conducting polymers, thin film Poly(3,4-ethylenedioxythiophene) Polystyrene sulfonate (PEDOT: PSS) is known to exhibit superior electronic conductivity.36 Also, * Electrochemical Society Active Member. z E-mail: wonchangchoi@kist.r...

show abstract

“…8,9 The XRD patterns presented in Fig. 2 indicate that the surface-modification using a simple wet-coating method does not cause a prominent bulk change of the parent OLO powders.…”

Section: Resultsmentioning

confidence: 94%

“…Therefore, OLO is receiving attention as a cathode material for lithium-ion batteries (LIBs). 8,9 However, OLO experiences an inevitable oxygen loss and, subsequently, an irreversible capacity during the initial charge and discharge process. Additionally, the layered structure of OLO transforms into the spinel phase on cycling.…”

mentioning

confidence: 99%

Surface Modification of Over-Lithiated Layered Oxides with PEDOT:PSS Conducting Polymer in Lithium-Ion Batteries

Lee

Choi

2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Except the super lattice peaks between 20° and 25°, the other peaks of the XRD patterns could be indexed based on the Į-NaFeO2 structure with space group R-3m. The weak peaks between 20° and 25° are consistent with the LiMn 6 cation arrangement that occurs in the transition metal layers of Li 2 MnO 3 regions or nano-domains, which can be indexed to the monoclinic unit cell C2/m [9]. No peak for any impurity phase is observed in the pattern, indicating the high purity of the prepared material.…”

Section: Measurementsmentioning

confidence: 52%

Synthesis and Properties of Nanoparticle Li[Li_0.2Mn_0.54Ni_0.13CO_0.13]O₂Cathode Material by Coprecipitation Method with Non-aqueous Medium

Liiu¹,

Chang²

2016

MATEC Web Conf.

View full text Add to dashboard Cite

show abstract

“…Moreover, previous HR-TEM and NMR studies predicted that the stacking fault produced broad peaks. [13][14][15][16] We have examined the local structure of Li 2 MnO 3 -LiMO 2 (M: Mn, Ni, Co) by a PDF analysis using neutron total scattering data to reveal the effect of the vacuum reduction heat-treatment. 9 Our group previously reported the formation of a reversible stable phase at 3.3 V during the first discharge process.…”

Section: Introductionmentioning

confidence: 99%

Change of Average, Local Structures for 0.5Li2MnO3-0.5LiMn5/12Ni5/12Co1/6O2 by Heat-Treatment under Vacuum

et al. 2017

View full text Add to dashboard Cite

We performed the heat-treatment of 0.5Li 2 MnO 3 -0.5LiMn 5/12 Ni 5/12 Co 1/6 O 2 under vacuum and investigated its cathode performance, and the crystal, electronic and local structures. The coulombic efficiency of the initial cycle was improved by the vacuum heat-treatment. Based on the results of a Rietveld analysis, the Mn-ordering increased after the reductive treatments as the oxygen content and the cation-mixing decreased. From the EXAFS, it was demonstrated that the intensity of the Mn-O and Mn-M bonds of the samples changed at the discharge state of 3.3 V for the heat-treated sample under vacuum. In order to clarify the transition-metal ordering in detail, the local environment of the samples at a 3.3 V discharge was analyzed by a Pair Distribution Function analysis. Based on the analysis, it was found that the heat-treated 0.5Li 2 MnO 3 -0.5LiMn 5/12 Ni 5/12 Co 1/6 O 2 under vacuum formed LiMn 6 arrangements in the transition metal layer and stabilized the local environments. The vacancies at the Li sites also increased around 3.3 V due to the vacuum heat-treatment to insert Li ions. Therefore, the reinsertion site of Li formed during the discharge process for the heat-treated sample because of the delithiation and oxygen desorption derived from the reductive heat treatment to obtain an initial enhanced discharge capacity and coulombic efficiency.

show abstract

Electrochemical and Structural Properties of xLi₂M‘O₃·(1−x)LiMn_0.5Ni_0.5O₂ Electrodes for Lithium Batteries (M‘ = Ti, Mn, Zr; 0 ≤ x ⩽ 0.3)

Cited by 498 publications

References 34 publications

Surface Modification of Over-Lithiated Layered Oxides with PEDOT:PSS Conducting Polymer in Lithium-Ion Batteries

Surface Modification of Over-Lithiated Layered Oxides with PEDOT:PSS Conducting Polymer in Lithium-Ion Batteries

Synthesis and Properties of Nanoparticle Li[Li_0.2Mn_0.54Ni_0.13CO_0.13]O₂Cathode Material by Coprecipitation Method with Non-aqueous Medium

Change of Average, Local Structures for 0.5Li<sub>2</sub>MnO<sub>3</sub>-0.5LiMn<sub>5/12</sub>Ni<sub>5/12</sub>Co<sub>1/6</sub>O<sub>2</sub> by Heat-Treatment under Vacuum

Contact Info

Product

Resources

About

Electrochemical and Structural Properties of xLi2M‘O3·(1−x)LiMn0.5Ni0.5O2 Electrodes for Lithium Batteries (M‘ = Ti, Mn, Zr; 0 ≤ x ⩽ 0.3)

Cited by 498 publications

References 34 publications

Surface Modification of Over-Lithiated Layered Oxides with PEDOT:PSS Conducting Polymer in Lithium-Ion Batteries

Surface Modification of Over-Lithiated Layered Oxides with PEDOT:PSS Conducting Polymer in Lithium-Ion Batteries

Synthesis and Properties of Nanoparticle Li[Li0.2Mn0.54Ni0.13CO0.13]O2Cathode Material by Coprecipitation Method with Non-aqueous Medium

Change of Average, Local Structures for 0.5Li<sub>2</sub>MnO<sub>3</sub>-0.5LiMn<sub>5/12</sub>Ni<sub>5/12</sub>Co<sub>1/6</sub>O<sub>2</sub> by Heat-Treatment under Vacuum

Contact Info

Product

Resources

About

Electrochemical and Structural Properties of xLi₂M‘O₃·(1−x)LiMn_0.5Ni_0.5O₂ Electrodes for Lithium Batteries (M‘ = Ti, Mn, Zr; 0 ≤ x ⩽ 0.3)

Synthesis and Properties of Nanoparticle Li[Li_0.2Mn_0.54Ni_0.13CO_0.13]O₂Cathode Material by Coprecipitation Method with Non-aqueous Medium