The effects of LaPO4 coating on the electrochemical properties of Li[Ni0.5Co0.2Mn0.3]O2 cathode material

Song, Han; Park, Kyu‐Sung; Park, Yong Joon

doi:10.1016/j.ssi.2011.12.014

Cited by 39 publications

(13 citation statements)

References 18 publications

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“…[2,3] Nevertheless, such high operating voltage of LNMO involves surface chemistry issues such as irreversible surface phase transition, transition metal dissolution, Jahn-Teller distortion of Mn 3+ , electrolyte oxidation, etc. [4][5][6][7][8][9][10] Considerable efforts have been devoted to alleviating these deficiencies by coating the LNMO surface using metal oxides, [11][12][13] phosphates, [14][15][16][17] fluorides, [18,19] and so forth. These coating materials can tackle the metal dissolution, electrolyte decomposition, and Mn 3+ Jahn-Teller distortion problems by simply shielding the cathode material from direct exposure to the electrolyte.…”

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confidence: 99%

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

et al. 2017

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A novel two-step surface modification method that includes atomic layer deposition (ALD) of TiO followed by post-annealing treatment on spinel LiNi Mn O (LNMO) cathode material is developed to optimize the performance. The performance improvement can be attributed to the formation of a TiMn O (TMO)-like spinel phase resulting from the reaction of TiO with the surface LNMO. The Ti incorporation into the tetrahedral sites helps to combat the impedance growth that stems from continuous irreversible structural transition. The TMO-like spinel phase also alleviates the electrolyte decomposition during electrochemical cycling. 25 ALD cycles of TiO growth are found to be the optimized parameter toward capacity, Coulombic efficiency, stability, and rate capability enhancement. A detailed understanding of this surface modification mechanism has been demonstrated. This work provides a new insight into the atomic-scale surface structural modification using ALD and post-treatment, which is of great importance for the future design of cathode materials.

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Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

et al. 2017

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“…However, Song et al showed that a 3 wt% coating of LaPO 4 on Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 (NMC532) was highly effective at improving charge-discharge capacity retention in the absence of additives. 15 Apparently, the electrochemical properties depend on the nature of the coating, the presence or absence of additives and also on different experimental conditions.…”

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confidence: 99%

Special Synergy between Electrolyte Additives and Positive Electrode Surface Coating to Enhance the Performance of Li[Ni_0.6Mn_0.2Co_0.2]O₂/Graphite Cells

Arumugam

et al. 2016

J. Electrochem. Soc.

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Li [Ni 0.6 Mn 0.2 Co 0.2 ]O 2 (NMC622) is one of the most attractive positive electrode materials for Li-ion cells. Ultra high precision coulometry, impedance spectroscopy, gas evolution and long-term cycling were used to explore the combined impact of several electrolyte additives and an Al 2 O 3 surface coating on NMC622/graphite cells tested to 4.4 V at 40 • C. An excellent correlation between the short-term coulombic efficiency measurements and the long-term cycling results was noted. An electrolyte containing 1 M LiPF 6 in ethylene carbonate: ethyl methyl carbonate (3:7 by weight) with additives 2 wt% prop-1-ene-1,3 sultone (PES) + 1 wt% methylene methane disulfonate (MMDS) + 1 wt% tris (trimethylsilyl) phosphite (TTSPi) (this electrolyte is called PES 211) was found to give the best performance in both coated and uncoated NMC622/graphite cells. The surface coating was found to improve coulombic efficiency, reduce impedance and improve capacity retention in all cases studied. However, uncoated NMC622/graphite cells with PES211 were found to perform better than coated NMC622/graphite cells which used any other electrolyte. The special synergy between Al 2 O 3 -coated NMC622 and PES211 needs to be understood so that even better coatings and electrolyte combinations can be developed. Li-ion batteries are the best power sources for applications ranging from portable electronics to electric vehicles.1,2 Properties such as high energy density, high power, low cost and longer life-time (calendar life) are often desired for such applications. Increasing the upper cutoff voltage in Li[Ni 1-x-y Mn y Co z ]O 2 "NMC" Li-ion cells results in increased energy density.3 However, increasing the upper cutoff voltage increases undesirable side reactions 4 (parasitic) at the electrodeelectrolyte interface and shortens the lifetime of the cell.5 While high energy density is important for many applications, lifetime is also important.Electrochemical oxidation of electrolytes occurring at the positive electrode at high voltage is a primary cause of cell failure. Hence methods to hinder these parasitic reactions should be developed. Coating the surface of the positive electrode and using electrolyte additives are two popular ways to suppress the parasitic reactions and thus improve the cell lifetime. As an example of work of the Umicore authors of this paper, Figure 1 shows a comparison between the charge-discharge capacity versus cycle number of Al 2 O 3 -coated NMC622/graphite and uncoated NMC622/graphite pouch type cells built at Umicore. The cells in Figure 1 used the same electrolyte which was supplied by PanaxEtec. They were tested at 1 C charge with a constant voltage hold till C/20 followed by a 1 C discharge between 3.0 V and 4.35 V at 25• C. The cells had a capacity of about 700 mAh with an initial typical gravimetric energy density of 180 Wh/kg @ 4.35 V. Figure 1 shows that: * Electrochemical Society Student Member.* * Electrochemical Society Fellow. z E-mail: jeff.dahn@dal.ca 1) Uncoated NMC622 -compared to Al 2 O 3 ...

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“…Song and colleagues studied the effect of LaPO 4 coating on the performance of LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode when cycled in a liquid electrolyte. [ 228 ] GD‐OES depth profiles showed a significant decrease in transition metal emission intensity for the uncoated electrode after 7 days of storage, particularly in regions near the surface and the interface ( Figure 15 c). That suggested a severe dissolution of cathode transition metal atoms into the electrolyte.…”

Section: Interface‐sensitive Techniquesmentioning

confidence: 99%

Interface Aspects in All‐Solid‐State Li‐Based Batteries Reviewed

Chen

Jiang

Zhou

et al. 2021

Advanced Energy Materials

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Extensive efforts have been made to improve the Li‐ionic conductivity of solid electrolytes (SE) for developing promising all‐solid‐state Li‐based batteries (ASSB). Recent studies suggest that minimizing the existing interface problems is even more important than maximizing the conductivity of SE. Interfaces are essential in ASSB, and their properties significantly influence the battery performance. Interface problems, arising from both physical and (electro)chemical material properties, can significantly inhibit the transport of electrons and Li‐ions in ASSB. Consequently, interface problems may result in interlayer formation, high impedances, immobilization of moveable Li‐ions, loss of active host sites available to accommodate Li‐ions, and Li‐dendrite formation, all causing significant storage capacity losses and ultimately battery failures. The characteristic differences of interfaces between liquid‐ and solid‐type Li‐based batteries are presented here. Interface types, interlayer origin, physical and chemical structures, properties, time evolution, complex interrelations between various factors, and promising interfacial tailoring approaches are reviewed. Furthermore, recent advances in the interface‐sensitive or depth‐resolved analytical tools that can provide mechanistic insights into the interlayer formation and strategies to tailor the interlayer formation, composition, and properties are discussed.

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The effects of LaPO4 coating on the electrochemical properties of Li[Ni0.5Co0.2Mn0.3]O2 cathode material

Cited by 39 publications

References 18 publications

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

Special Synergy between Electrolyte Additives and Positive Electrode Surface Coating to Enhance the Performance of Li[Ni_0.6Mn_0.2Co_0.2]O₂/Graphite Cells

Interface Aspects in All‐Solid‐State Li‐Based Batteries Reviewed

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The effects of LaPO4 coating on the electrochemical properties of Li[Ni0.5Co0.2Mn0.3]O2 cathode material

Cited by 39 publications

References 18 publications

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

Special Synergy between Electrolyte Additives and Positive Electrode Surface Coating to Enhance the Performance of Li[Ni0.6Mn0.2Co0.2]O2/Graphite Cells

Interface Aspects in All‐Solid‐State Li‐Based Batteries Reviewed

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Special Synergy between Electrolyte Additives and Positive Electrode Surface Coating to Enhance the Performance of Li[Ni_0.6Mn_0.2Co_0.2]O₂/Graphite Cells