Cycle life improvement of ZrO2-coated spherical LiNi1/3Co1/3Mn1/3O2 cathode material for lithium ion batteries

Hu, Shaokang; Cheng, Geng-Hao; Cheng, Ming‐Yao; Hwang, Bing‐Joe; Santhanam, R.

doi:10.1016/j.jpowsour.2008.11.113

Cited by 301 publications

(156 citation statements)

References 32 publications

Supporting

Mentioning

151

Contrasting

Unclassified

Order By: Relevance

“…2,3 Several methods have been investigated to allow LIB to use higher cutoff potentials without compromising their lifetime. Sun et al 4 and Hu et al 5 showed that AlF 3 or ZrO 2 -coatings improved the rate capability, cycling stability and interface stability for Li [ Alternative solvents are another way of extending the potential operating range for LIB. Fluorinated solvents, 8,9 dinitriles 10 or sulfones 11,12 are of interest because their oxidation potentials are higher than that of traditional alkyl carbonate solvents.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Guide to Ethylene Carbonate-Free Electrolyte Making for Li-Ion Cells

Glazier

Petibon

et al. 2016

J. Electrochem. Soc.

130

119

View full text Add to dashboard Cite

Li [Ni 0.42 Mn 0.42 Co 0.16 ]O 2 (NMC442)/graphite pouch cells demonstrate superb performance at high voltage when ethylene carbonate (EC)-free electrolytes, using a solvent mixture that is >95% ethyl methyl carbonate (EMC) and between 2 and 5% of an "enabler", are used. The "enablers", required to passivate graphite during formation, can be vinylene carbonate (VC), methylene-ethylene carbonate (MEC), fluoroethylene carbonate (FEC) or difluoro ethylene carbonate (DiFEC), among others. In order to optimize the amount of "enabler" added to EMC, gas chromatography coupled with mass spectrometry (GC-MS) was used to track the consumption of "enabler" during the formation step. Storage tests, electrochemical impedance spectroscopy (EIS), ultrahigh precision coulometry (UHPC), long-term cycling, differential voltage analysis and isothermal microcalorimetry were used to determine the optimum amount of enabler to add to the cells. It was found that the graphite negative electrode cannot be fully passivated when the amount of "enabler" is too low resulting in gas production and capacity fade. Using excess "enabler" can cause large impedance and gas production in most cases. The choice of "enabler" also impacts cell performance. A solvent blend of 5% FEC with 95% EMC (by weight) provides the best combination of properties in NMC442/graphite cells operated to 4.4 V. It is our opinion that the experiments and their interpretation presented here represent a primer for the design of EC-free electrolytes. Lithium-ion batteries (LIB) are now widely used in electrified vehicles and energy storage systems.1 These applications require longer calendar and cycle lifetime as well as higher energy density. In order to increase the energy density of LIB, researchers focus on developing electrode materials with high specific capacity that may involve charging to increased upper cutoff potentials.2,3

show abstract

mentioning

confidence: 99%

“…Then the extracted sample was filtered and put in a mixture of dichloromethane:water (100:1 wt/wt) to remove damaging chemicals such as PF 5 and HF which reside in the aqueous phase. A sample from the organic phase was then injected into the GC-MS. A detailed description of the GC-MS setup can be found in Reference 18.…”

mentioning

confidence: 99%

A Guide to Ethylene Carbonate-Free Electrolyte Making for Li-Ion Cells

Glazier

Petibon

et al. 2016

J. Electrochem. Soc.

130

119

View full text Add to dashboard Cite

show abstract

“…However, the coating effect for cathodes is highly attributable to the specific coating material, coating morphology, and coating content or thickness. [16][17][18][19] Thus, a careful characterization of the interface between a coating material and pristine cathode is a key factor to obtain a highly improved cathode material via surface coating. However, it has been difficult to characterize this interface reaction because of the small particle size of the pristine powder, very low thickness of the coating layer, and rough surface of the positive electrode.…”

Section: Introductionmentioning

confidence: 99%

Protection Effect of ZrO₂Coating Layer on LiCoO₂Thin Film

Lee¹,

Nam²,

Park³

2011

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

The protection effect of a ZrO2 coating layer on a LiCoO2 thin film was characterized. A wide and smooth LiCoO2 thin film offers sufficient opportunity for careful observation of the reaction at the interface between cathode (coated and uncoated) and electrolyte. The formation of a ZrO2 coating on a LiCoO2 thin film was confirmed by secondary ion mass spectrometry. Scanning electron and atomic force microscopy were used to characterize the surface morphologies of coated and uncoated films before and after cycling. A ZrO2-coated LiCoO2 film showed a higher discharge capacity and rate capability than an uncoated film. This may be associated with a surface protection effect of the coating. The surface of a pristine film was damaged during cycling, whereas the coated film maintained a relatively clear surface under the same measurement conditions. This result clearly demonstrates the protection effect of a ZrO2 coating on a LiCoO2 thin film.

show abstract

“…[11][12][13] Moreover, Zr comound such as zirconium oxide has been investigated and found to be an excellent coating substituent. 14,15 In the present study, the ZrFx surface modified Li[Ni1/3Co1/3Mn1/3]O2 cathodes were prepared and their electrochemical and structural properties were characterized.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Property of Surface Modified Li[Co_1/3Ni_1/3Mn_1/3]O₂by ZrF_xCoating

Yun¹,

Park

2010

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

A Li[Ni1/3Co1/3Mn1/3]O2 cathode was modified by applying a ZrFx coating. The surface-modified cathodes were characterized by XRD, SEM, EDS, TEM techniques. XRD patterns of ZrFx-coated Li[Ni1/3Co1/3Mn1/3]O2 revealed that the coating did not affect the crystal structure of the parent powder. SEM and TEM images showed that ZrFx nano-particles were formed as a coating layer, and EDS data confirmed that ZrFx distributed uniformly on the surface the powder. Capacity retention of coated samples at high C rates was superior to that of pristine sample. However, as the coating concentration increases beyond the optimum concentration, the rate capability was deteriorated. Whereas, as the increase of coating concentration to 2.0 wt %, the cyclic performances of the electrodes under the severe conditions (high cut-off voltage, 4.8 V, and high measurement temperature, 55 o C) were improved considerably.

show abstract

Cycle life improvement of ZrO2-coated spherical LiNi1/3Co1/3Mn1/3O2 cathode material for lithium ion batteries

Cited by 301 publications

References 32 publications

A Guide to Ethylene Carbonate-Free Electrolyte Making for Li-Ion Cells

A Guide to Ethylene Carbonate-Free Electrolyte Making for Li-Ion Cells

Protection Effect of ZrO₂Coating Layer on LiCoO₂Thin Film

Enhanced Electrochemical Property of Surface Modified Li[Co_1/3Ni_1/3Mn_1/3]O₂by ZrF_xCoating

Contact Info

Product

Resources

About

Cycle life improvement of ZrO2-coated spherical LiNi1/3Co1/3Mn1/3O2 cathode material for lithium ion batteries

Cited by 301 publications

References 32 publications

A Guide to Ethylene Carbonate-Free Electrolyte Making for Li-Ion Cells

A Guide to Ethylene Carbonate-Free Electrolyte Making for Li-Ion Cells

Protection Effect of ZrO2Coating Layer on LiCoO2Thin Film

Enhanced Electrochemical Property of Surface Modified Li[Co1/3Ni1/3Mn1/3]O2by ZrFxCoating

Contact Info

Product

Resources

About

Protection Effect of ZrO₂Coating Layer on LiCoO₂Thin Film

Enhanced Electrochemical Property of Surface Modified Li[Co_1/3Ni_1/3Mn_1/3]O₂by ZrF_xCoating