Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating

Ha, Hyung-Wook; Yun, Nan Ji; Kim, Min-Hyuk; Woo, Myung Heui; Kim, Keon

doi:10.1016/j.electacta.2005.09.023

Cited by 67 publications

(31 citation statements)

References 16 publications

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“…Recently, a few studies of CeO 2 -coating have been investigated to improve the electrochemical performance of LiCoO 2 , LiNi 0.8 Co 0.2 O 2 and LiMn 2 O 4 [12][13][14]. Up to the present, the coating effects on LiCo 1/3 Ni 1/3 Mn 1/3 O 2 have been seldom reported, especially CeO 2 -coating.…”

Section: Introductionmentioning

confidence: 92%

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

Wang

et al. 2009

Electrochimica Acta

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Section: Introductionmentioning

confidence: 92%

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

Wang

et al. 2009

Electrochimica Acta

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“…25,26 Other studies have included the use of CeO 2 as a surface protective layer to improve the cycleability and capacity retention of LiCo 1/3 Ni 1/3 Mn 1/3 O 2 , LiFePO 4 , and LiCoO 2 , when used as cathode materials. [27][28][29] However, these coating methods employed sol-gel methods, which pose some disadvantages due to their inability to control the thicknesses of the coatings, which leads to an overly thick or non-uniform coating. In our recent study, we employed the use of optimally thick CeO 2 film prepared by ALD on LiMn 2 O 4 particles, which showed a 24% increase in initial capacity and 95% capacity retention, when tested at a 1C rate for 1,000 cycles at room temperature.…”

mentioning

confidence: 99%

Ultrathin Conductive CeO₂Coating for Significant Improvement in Electrochemical Performance of LiMn_1.5Ni_0.5O₄Cathode Materials

Patel

Palaparty

Liu

2016

J. Electrochem. Soc.

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LiMn 1.5 Ni 0.5 O 4 (LMNO) has a huge potential for use as a cathode material in electric vehicular applications. However, it could face discharge capacity degradation with cycling at elevated temperatures due to attacks by hydrofluoric acid (HF) from the electrolyte, which could cause cationic dissolution. To overcome this barrier, we coated 3-5 micron sized LMNO particles with a ∼3 nm optimally thick and conductive CeO 2 film prepared by atomic layer deposition (ALD). This provided optimal thickness for mass transfer resistance, species protection, and mitigation of cationic dissolution at elevated temperatures. After 1,000 cycles of chargedischarge between 3.5 V-5 V (vs. Li + /Li) at 55 • C, the optimally coated sample, 50Ce (50 cycles of CeO 2 ALD coated) had a capacity retention of ∼97.4%, when tested at a 1C rate, and a capacity retention of ∼83% at a 2C rate. This was compared to uncoated LMNO particles that had a capacity retention of only ∼82.7% at a 1C rate, and a capacity retention of ∼40.8% at a 2C rate. Lithium ion batteries have emerged as potential candidates for replacement of Ni-Cd batteries in electric vehicles because of their high intrinsic energy densities combined with their ease of portability. This potential creates a need for the development of new or modified cathode and anode materials that possess high energy density, long cycle life, excellent capacity retention, and a large voltage window for operation. For electric vehicles, in particular, the upper voltage cutoff window on the cathode side should be ∼5 V vs. Li + /Li. Lithium manganese nickel oxide LiMn 1.5 Ni 0.5 O 4 (LMNO) has emerged in the research community as a potential cathode material for use in electric vehicles due to its large theoretical capacity of ∼148 mAhg −1 , a high working voltage of ∼4.7 V vs. Li + /Li, and a high energy density. 1,2However, LMNO suffers from high capacity fade during performance at elevated temperatures because Mn dissolves due to generation of hydrofluoric acid (HF) in the electrolyte. 3-5The coating of surface protective layers on pristine LMNO particles has been extensively studied in literature. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] These layers provide a shield from the HF, and prevent rapid capacity fade, leading to improved cycling performance and capacity retention. Of the different surface coating techniques, atomic layer deposition (ALD) has inherent advantages that provide conformal, pin-hole free, size-tunable ultrathin films 21 and, thus, provide high capacity retention and a long life cycle. The ALD process involves a sequence of self-limiting reactions that result in a coating of one monolayer at a time. This enables size tunability at the sub-nanometer level and promotes conformity in the films. Materials like Al 2 O 3 , 17 MgF 2 , 22 TiO 2 , 18 and LiAlO 2 10 have been studied as coating materials prepared by ALD on LMNO. Even though, these materials have provided effective mitigation of cationic dissolution, the ionic conductivity of such protective layers ...

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“…This abnormal increase in the total resistance was attributed to the change in the particle surface and the morphologies of the particles [9] . Ha et al [10][11][12] suggested that the presence of CeO 2 on the cathode particles could limit the direct contact of the active material with the electrolyte, improve interface stability and prevent dissolution of Mn and Ni ions in the electrolyte.…”

Section: Electrochemical Properties Of Ceo 2 -Coated Lico 1/3 Ni 1/3 mentioning

confidence: 99%

“…Some studies showed that C, ZrO 2 , TiO 2 , Al 2 O 3 , Al(OH) 3 coating on LiCo 1/3 Ni 1/3 Mn 1/3 O 2 could improve the electrochemical properties [7][8][9] . Recently, reports pointed out that the CeO 2 coating on LiCoO 2 , LiMn 2 O 4 and LiNi 0.8 Co 0.2 O 2 had a benefit to its electrochemical performance [10][11][12] .…”

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confidence: 99%

Modification of LiCo1/3Ni1/3Mn1/3O2 cathode material by CeO2-coating

Wang

et al. 2008

Sci. China Ser. E-Technol. Sci.

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2 -coated cathode is 182.5 mAh·g −1 at a current density of 20 mA·g −1 , in contrast to 165.8 mAh·g −1 of the bared sample. The discharge capacity retention of 1.0 wt% CeO 2 -coated sample after 12 cycles reaches 93.2%, in comparison with 86.6% of the bared sample. CV results show that the CeO 2 coating could suppress phase transitions and prevent the surface of cathode material from direct contact with the electrolyte, thus enhance the electrochemical performance of the coated material.

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Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating

Cited by 67 publications

References 16 publications

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

Ultrathin Conductive CeO₂Coating for Significant Improvement in Electrochemical Performance of LiMn_1.5Ni_0.5O₄Cathode Materials

Modification of LiCo1/3Ni1/3Mn1/3O2 cathode material by CeO2-coating

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Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating

Cited by 67 publications

References 16 publications

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

Ultrathin Conductive CeO2Coating for Significant Improvement in Electrochemical Performance of LiMn1.5Ni0.5O4Cathode Materials

Modification of LiCo1/3Ni1/3Mn1/3O2 cathode material by CeO2-coating

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Ultrathin Conductive CeO₂Coating for Significant Improvement in Electrochemical Performance of LiMn_1.5Ni_0.5O₄Cathode Materials