Electrochemical Characterization of Positive Electrode Material LiNi[sub 1/3]Co[sub 1/3]Mn[sub 1/3]O[sub 2] and Compatibility with Electrolyte for Lithium-Ion Batteries

Wang, Zhaoxiang; Sun, Yucheng; Chen, Liquan; Huang, Xuejie

doi:10.1149/1.1740781

Cited by 152 publications

(96 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…160 mAh g ¹1 at the end of the 50th cycle, which is 97% of its initial discharge capacity, whereas the discharge capacity for LiPF 6 / EC+DMC decreases significantly presumably owing to the instability of the delithiated NMC surface 24 or electrolyte decomposition. 25,26 This suggests that the stable cycle characteristics of the FSI-based ionic liquid are attributed to the formation of a stable solid electrolyte interface layer, as mentioned above. It should be noted that no other electrolytes behave in the same way as the FSIbased ionic liquid, which represents a more stable charge-discharge cycling of an NMC cathode than conventional organic electrolytes without any surface coating.…”

Section: Resultsmentioning

confidence: 65%

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

et al. 2012

View full text Add to dashboard Cite

We evaluated the charge-discharge behavior of a LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) electrode in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI) ionic liquid. At 163 mAh g −1 after 50 cycles, the discharge capacity of the NMC cathode in LiTFSI/EMImFSI (TFSI − = bis(trifluoromethylsulfonyl)imide) at 1.0 C in the voltage range 3.0-4.5 V (vs. Li/Li + ) is comparable to that in the conventional electrolyte, LiPF 6 /EC+DMC. Moreover, the rate capability of the cell with LiTFSI/EMImFSI exceeded that with LiPF 6 /EC+DMC, especially at high rates, probably owing to the low resistance at the electrode/electrolyte interface. These results suggest that EMImFSI is a suitable electrolyte for lithium-ion batteries utilizing an NMC cathode.

show abstract

Section: Resultsmentioning

confidence: 65%

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The diffraction patterns of all samples were similar with no impurity peaks, which are attributed from the homogeneous atomic scale mixing of the starting materials. The additional less intense peaks between 2θ = [21][22][23][24][25] o were considered to be attributed to the formation of monoclinic Li[Li 1/3 Mn 2/3 ]O 2 phase (C2/m). The superlattice ordering resulted from the short-range ordering of Li, Fe, Ni, and Mn atoms in the transition metal layers.…”

Section: Resultsmentioning

confidence: 99%

“…18, 21 The small particles of 10-20 nm size observed on the surface of all sample in Figure 2 could be considered as carbon.…”

Section: -15mentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

“…Numbers in parentheses are estimated standard deviations of the last significant digits, and parameters without deviations are fixed R-factors are R wp = 8.10%, R P = 6.00%, R exp = 3.14%, a = 0.2874210 (7) nm, c = 1.419003 (7) nm. (6). R factors are R wp = 5.18%, R P = 3.51%, R exp = 2.44%, a = 0.287559(3) nm, c = 1.41918(4) nm.…”

Section: ¹2mentioning

confidence: 99%

“…The large irreversible capacity evident in this figure is attributable to the formation of a solid electrolyte interface layer in the first cycle. 6 The sample after charging was the second-cycle (SOC 30%) sample.…”

Section: ¹2mentioning

confidence: 99%

Change in Crystal Structure of LiNi0.8Co0.19Cu0.01O2 Cathode during Charge of Coin Cell Observed by Ex Situ Time-of-flight Neutron Diffraction

Idemoto¹,

Tsukada²,

Kitamura³

et al. 2011

Chemistry Letters

View full text Add to dashboard Cite

In the present study, we performed a new ex situ analysis of the change in the crystal structure of a cathode containing the composite material in a coin cell during the chargedischarge cycle. Time-of-flight neutron powder diffraction with Rietveld refinement was used to analyze the crystal structure of LiNi 0.8 Co 0.19 Cu 0.01 O 2 produced by solid-phase synthesis, both for the powder and a cathode before and after charging. The powder and the cathode had similar crystal structure parameters before charging. The results obtained demonstrate that crystal structure analysis by neutron diffraction is possible for a cathode containing 8.5 mg of active material. The results also showed that it is possible to quantitatively determine the Li composition, Li/Ni cation mixing amount, (Ni,Co,Cu)O 6 octahedral distortion, and small quantities of the second phase component in the cathode before and after charging.LiCoO 2 is currently used in the cathodes of most commercially available lithium-ion batteries. However, a great deal of research has been devoted to finding a substitute for cobalt, which is both expensive and toxic.1 In our research, we have focused on a Li(Ni,Co)O 2 system in which Co is substituted by Ni in LiNiO 2 . With its relatively high capacitance and low Co content, this system is a promising replacement for LiCoO 2 . However, Li is volatile at high temperatures and Li loss and cation mixing tend to occur under calcination. This is because Ni 2+ has a similar radius (0.69 ¡) to Li + (0.76 ¡) and it thus tends to occupy the empty site, resulting in inferior battery performance.2 To resolve this problem, we synthesized a test material in which a portion of the (Ni, Co) is replaced by lowvalence Cu with the aim of reducing the Ni 2+ content to reduce cation mixing and thereby enhance the battery characteristics. To determine the amount of Li/Ni cation mixing, we have performed average structure analysis by neutron diffraction with Rietveld refinement.3 This analysis has mainly been performed on the powder form that has not been subjected to charge discharge cycling, but to determine the battery characteristics it is essential to determine changes in the crystal structure during the cycle. However, as the electrodes in coin cells contain relatively small amounts of active material, it has not been possible to perform structure analysis by neutron diffraction of samples subjected to chargedischarge.In the present study, we performed ex situ measurements of the change in the crystal structure of the cathode material subjected to a chargedischarge cycle in a coin cell fabricated for this purpose. The results of time-of-flight neutron diffraction analysis of the cathode, which is composed of solid-phasesynthesized LiNi 0.8 Co 0.19 Cu 0.01 O 2 as the active cathode material together with a conductor and a binder, before and after charging demonstrate that it is possible to determine the change in the crystal structure in an actual cathode containing 8.5 mg of active material.LiNi 0.8 Co 0.19 Cu 0.01 O 2 was synt...

show abstract

Electrochemical Characterization of Positive Electrode Material LiNi[sub 1/3]Co[sub 1/3]Mn[sub 1/3]O[sub 2] and Compatibility with Electrolyte for Lithium-Ion Batteries

Cited by 152 publications

References 40 publications

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

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

Change in Crystal Structure of LiNi0.8Co0.19Cu0.01O2 Cathode during Charge of Coin Cell Observed by Ex Situ Time-of-flight Neutron Diffraction

Contact Info

Product

Resources

About

Electrochemical Characterization of Positive Electrode Material LiNi[sub 1/3]Co[sub 1/3]Mn[sub 1/3]O[sub 2] and Compatibility with Electrolyte for Lithium-Ion Batteries

Cited by 152 publications

References 40 publications

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

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

Change in Crystal Structure of LiNi0.8Co0.19Cu0.01O2 Cathode during Charge of Coin Cell Observed by Ex Situ Time-of-flight Neutron Diffraction

Contact Info

Product

Resources

About

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