Electrochemical performance of cobalt free, Li1.2(Mn0.32Ni0.32Fe0.16)O2 cathodes for lithium batteries

Karthikeyan, K.; Pandian, Amaresh Samuthira; Lee, G.W.; Aravindan, Vanchiappan; Kim, H.; Kang, Kisuk; Kim, W.S.; Lee, Y.S.

doi:10.1016/j.electacta.2012.02.076

Cited by 87 publications

(111 citation statements)

References 40 publications

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“…5,[13][14][15] Although a large irreversible capacity (ICL) loss was observed for all cells, a columbic efficiency of over 99% was achieved after second cycle irrespective of samples tested. During the first charge, the Li 1-z Ni 1+z O 2 structure (α-NaFeO 2 system) was destroyed due to the deintercalation of Li + from unstable 3a site and the total quantity of Li + for intercalation for first discharge will be limited, which leads to the large ICL.…”

Section: 6mentioning

confidence: 99%

“…It is worth mentioning here that the Fe ions did not oxidize or reduce during the C-DC process, which was confirmed by the disappearance of a voltage plateau around 4 V, resulting from the partial cation mixing between the transition metal layers by Fe ions. 5,13,15 Meanwhile, the manganese ions did not participate in the electrochemical process due to the limitation of oxidation stage of Mn 4+ to form Mn 5+ .…”

Section: -15mentioning

confidence: 99%

“…Although the origin of the plateau is still unknown, it was also observed in previous studies. [13][14][15] Among the cells, the Li , respectively, at the same current density. The highest capacity of Li 1.2 (Mn 0.32 Ni 0.32 Fe 0.16 ) 2 /Li + cell was attributed from its welldefined structure with uniform particle size and distribution of the cathode material.…”

Section: 6mentioning

confidence: 99%

“…12, 15 The lattice parameters for all samples were calculated based on hexagonal structure and presented as plot against x value in Figure 1(b). The values of a and c are slightly larger with increasing x value, demonstrating the effect of lithium substitution on the structural parameters.…”

Section: -15mentioning

confidence: 99%

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Adipic Acid Assisted Sol-Gel Synthesis of Li_1+x(Mn_0.4Ni_0.4Fe_0.2)_1-xO₂(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Karthikeyan¹,

Pandian²,

Son³

et al. 2013

Bulletin of the Korean Chemical Society

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Layered Li 1+x (Mn 0.4 Ni 0.4 Fe 0.2 ) 1-x O 2 (0 < x < 0.3) solid solutions were synthesized using solgel method with adipic acid as chelating agent. Structural and electrochemical properties of the prepared powders were examined by means of X-ray diffraction, Scanning electron microscopy and galvanostatic charge/discharge cycling. All powders had a phase-pure layered structure with R3m space group. The morphological studies confirmed that the size of the particles increased at higher x content. The charge-discharge profiles of the solid solution against lithium using 1 M LiPF 6 in EC/DMC as electrolyte revealed that the discharge capacity increases with increasing lithium content at the 3a sites. Among the cells, Li 1.2 (Mn0 .32 Ni 0.32 Fe 0.16 )O 2 (x = 0.2)/ Li + exhibits a good electrochemical property with maximum initial capacity of 160 mAhg −1 between 2-4.5 V at 0.1 mAcm −2 current density and the capacity retention after 25 cycles was 92%. Whereas, the cell fabricated with x = 0.3 sample showed continuous capacity fading due to the formation of spinel like structure during the subsequent cycling. The preparation of solid solutions based on LiNiO 2 -LiFeO 2 -Li 2 MnO 3 has improved the properties of its end members.

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Section: 6mentioning

confidence: 99%

Section: -15mentioning

confidence: 99%

Section: 6mentioning

confidence: 99%

Section: -15mentioning

confidence: 99%

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Adipic Acid Assisted Sol-Gel Synthesis of Li_1+x(Mn_0.4Ni_0.4Fe_0.2)_1-xO₂(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Karthikeyan¹,

Pandian²,

Son³

et al. 2013

Bulletin of the Korean Chemical Society

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“…These peaks are attributed to the redox reaction of Ni 2+ /Ni 4+ couple as was speculated elsewhere. 30,31 It is worthy to mention here that, in order to maintain the charge neutrality, most of the Ni ions are presented in 2 + oxidation state in Li highest capacity of 207 mAhg −1 and maintained 80% of the initial discharge capacity after 20 cycles. Although the material prepared at 800 °C delivered a lower capacity, it exhibited good capacity retention during cycling due to its better structural integrity.…”

Section: +mentioning

confidence: 99%

Preparation and Cyclic Performance of Li_1.2(Fe_0.16Mn_0.32Ni_0.32)O₂Layered Cathode Material by the Mixed Hydroxide Method

Karthikeyan¹,

Nam²,

Hu³

et al. 2013

Bulletin of the Korean Chemical Society

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Layered Li 1.2 (Fe 0.16 Mn 0.32 Ni 0.32 )O 2 was prepared by the mixed hydroxide method at various temperatures. Xray diffraction (XRD) pattern shows that this material has a α-NaFeO 2 layered structure with R3m space group and that cation mixing is reduced with increasing synthesis temperature. Scanning electron microscopy (SEM) reveals that nano-sized Li 1.2 (Fe 0.16 Mn 0.32 Ni 0.32 )O 2 powder has uniform particle size distribution. X-ray absorption near edge structure (XANES) analysis is used to study the local electronic structure changes around the Mn, Fe, and Ni atoms in this material. The sample prepared at 700 °C delivers the highest discharge capacity of 207 mAhg −1 between 2-4.5 V at 0.1 mAcm −2 with good capacity retention of 80% after 20 cycles.

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Enhanced Performance of P2‐Na_0.66(Mn_0.54Co_0.13Ni_0.13)O₂ Cathode for Sodium‐Ion Batteries by Ultrathin Metal Oxide Coatings via Atomic Layer Deposition

Karthikeyan

Liu

Xiao

et al. 2017

Adv Funct Materials

147

102

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Sodium-ion batteries are widely considered as promising energy storage systems for large-scale applications, but their relatively low energy density hinders further practical applications. Developing high-voltage cathode materials is an effective approach to increase the overall energy density of sodium-ion batteries. When cut-off voltage is elevated over 4.3 V, however, the cathode becomes extremely unstable due to structural transformations as well as metal dissolution into the electrolytes. In this work, the cyclic stability of P2-Na 0.66 (Mn 0.54 Co 0.13 Ni 0.13 )O 2 (MCN) electrode at a cut-off voltage of 4.5 V is successfully improved by using ultrathin metal oxide surface coatings (Al 2 O 3 , ZrO 2 , and TiO 2 ) deposited by an atomic layer deposition technique. The MCN electrode coated with the Al 2 O 3 layer exhibits higher capacity retention among the MCN electrodes. Moreover, the rate performance of the MCN electrode is greatly improved by the metal oxide coatings in the order of TiO 2 < Al 2 O 3 < ZrO 2 , due to increased fracture toughness and electrical conductivity of the metal oxide coating layers. A ZrO 2 -coated MCN electrode shows a discharge capacity of 83 mAh g −1 at 2.4 A g −1 , in comparison to 61 mAh g −1 for a pristine MCN electrode. Cyclic voltammetry and electrochemical impedance analysis disclose the reduced charge transfer resistance from 1421 to 760.2 Ω after cycles, suggesting that the metal oxide coating layer can effectively minimize the undesirable phase transition, buffer inherent stress and strain between the binder, cathode, and current collector, and avoid volumetric changes, thus increasing the cyclic stability of the MCN electrode.

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Electrochemical performance of cobalt free, Li1.2(Mn0.32Ni0.32Fe0.16)O2 cathodes for lithium batteries

Cited by 87 publications

References 40 publications

Adipic Acid Assisted Sol-Gel Synthesis of Li_1+x(Mn_0.4Ni_0.4Fe_0.2)_1-xO₂(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Adipic Acid Assisted Sol-Gel Synthesis of Li_1+x(Mn_0.4Ni_0.4Fe_0.2)_1-xO₂(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Preparation and Cyclic Performance of Li_1.2(Fe_0.16Mn_0.32Ni_0.32)O₂Layered Cathode Material by the Mixed Hydroxide Method

Enhanced Performance of P2‐Na_0.66(Mn_0.54Co_0.13Ni_0.13)O₂ Cathode for Sodium‐Ion Batteries by Ultrathin Metal Oxide Coatings via Atomic Layer Deposition

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Electrochemical performance of cobalt free, Li1.2(Mn0.32Ni0.32Fe0.16)O2 cathodes for lithium batteries

Cited by 87 publications

References 40 publications

Adipic Acid Assisted Sol-Gel Synthesis of Li1+x(Mn0.4Ni0.4Fe0.2)1-xO2(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Adipic Acid Assisted Sol-Gel Synthesis of Li1+x(Mn0.4Ni0.4Fe0.2)1-xO2(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Preparation and Cyclic Performance of Li1.2(Fe0.16Mn0.32Ni0.32)O2Layered Cathode Material by the Mixed Hydroxide Method

Enhanced Performance of P2‐Na0.66(Mn0.54Co0.13Ni0.13)O2 Cathode for Sodium‐Ion Batteries by Ultrathin Metal Oxide Coatings via Atomic Layer Deposition

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Adipic Acid Assisted Sol-Gel Synthesis of Li_1+x(Mn_0.4Ni_0.4Fe_0.2)_1-xO₂(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Adipic Acid Assisted Sol-Gel Synthesis of Li_1+x(Mn_0.4Ni_0.4Fe_0.2)_1-xO₂(0 > x > 0.3) as Cathode Materials for Lithium Ion Batteries

Preparation and Cyclic Performance of Li_1.2(Fe_0.16Mn_0.32Ni_0.32)O₂Layered Cathode Material by the Mixed Hydroxide Method

Enhanced Performance of P2‐Na_0.66(Mn_0.54Co_0.13Ni_0.13)O₂ Cathode for Sodium‐Ion Batteries by Ultrathin Metal Oxide Coatings via Atomic Layer Deposition