Silyl-group functionalized organic additive for high voltage Ni-rich cathode material

Jang, Seol Heui; Jung, Kwangeun; Yim, Taeeun

doi:10.1016/j.cap.2018.07.016

Cited by 33 publications

(34 citation statements)

References 48 publications

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“…Some additives with strong anion coordination effect, for instance tris (pentafluorophenyl) borane (TPFPB), are known to trap highly reactive oxygen species (O 2 2− /O 2 − ) or radicals (O 2 Ÿ− /O Ÿ− ) that will otherwise oxidize the electrolyte and induce structural transformation [136]. Figure 15a,b show the enabling effect of sample additives (i.e., silyl-functionalized dimethoxydimethylsilane and blend of FEMC and VC) on Ni-rich cathode materials [137,138].…”

Section: Functional Electrolyte Additivesmentioning

confidence: 99%

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

et al. 2020

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Driven by the increasing plea for greener transportation and efficient integration of renewable energy sources, Ni-rich metal layered oxides, namely NMC, Li [Ni1−x−yCoyMnz] O2 (x + y ≤ 0.4), and NCA, Li [Ni1−x−yCoxAly] O2, cathode materials have garnered huge attention for the development of Next-Generation lithium-ion batteries (LIBs). The impetus behind such huge celebrity includes their higher capacity and cost effectiveness when compared to the-state-of-the-art LiCoO2 (LCO) and other low Ni content NMC versions. However, despite all the beneficial attributes, the large-scale deployment of Ni-rich NMC based LIBs poses a technical challenge due to less stability of the cathode/electrolyte interphase (CEI) and diverse degradation processes that are associated with electrolyte decomposition, transition metal cation dissolution, cation–mixing, oxygen release reaction etc. Here, the potential degradation routes, recent efforts and enabling strategies for mitigating the core challenges of Ni-rich NMC cathode materials are presented and assessed. In the end, the review shed light on the perspectives for the future research directions of Ni-rich cathode materials.

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Section: Functional Electrolyte Additivesmentioning

confidence: 99%

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

et al. 2020

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“…However, the cycling performance still needs to be improved, for example, by using various approaches such as change structure, doping, coatings and additives for the organic electrolyte, which can improve the surface of LiNCM materials with Ni content over 80 %. [7,44,47,48]…”

Section: Resultsmentioning

confidence: 99%

Ni‐Rich Layered Cathode Materials by a Mechanochemical Method for High‐Energy Lithium‐Ion Batteries

et al. 2020

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Ni‐rich cathode materials are attractive for use in high energy density lithium‐ion batteries due to low Co, high specific capacity and low cost; however, due to the poor cycling stability of materials with high Ni content of over 80 %, their large‐scale application in electric vehicles is limited. Furthermore, for industrial applications, it is important to simplify the synthetic procedures to reduce the manufacturing cost of the cathode material. A mechanochemical method is introduced for a combination of carbonate and hydroxide starting materials with Ni content of over 80, 85, and 90 %. These precursor materials are stable in air and are easy to use for the synthesis of LiNixCoyMnzO2 materials by solid state reaction. The crystalline structures and surface morphologies of the obtained mixed precursors and LiNixCoyMnzO2 powders are characterized using X‐ray diffraction analysis and field scanning electron microscopy with energy dispersive X‐Ray spectroscopy. The electrochemical performance is evaluated by repeat charge‐discharge cycling and measurement of the rate capability for various potential ranges from 3.0 to various high cut‐off potentials of 4.2, 4.3 and 4.4 V vs. Li/Li+. The results suggest that the whole process is very simple and similar to that used in the production of commercial LiNixCoyMnzO2, with no additional equipment needed in the application of this synthesis method for industrial purposes.

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“…To overcome these problems, many strategies have been intensively explored, including: 1) development of NCM cathode material coated with oxides such as Al [31][32][33][34][35], 2) modification of NCM surface by the introduction of artificial cathode-electrolyte interphases (CEI) [36][37][38][39][40], and 3) use of functional additives in the electrolytes that can form a CEI layer on the surface of the NCM cathode material [41][42][43][44][45]. In recent studies, it has been reported that functional electrolyte additives evidently improve electrochemical performances of the Ni-rich NCM cathode material such as TPPO [46], DODSi [47], SA [48], 2-TS [49], and BFS [50], which have task-specific functional groups on the molecular structure of electrolyte additives. In other word, use of electrolyte additive can be considered as one of efficient method to improve electrochemical performance of the NCM cathode materials.…”

Section: Introductionmentioning

confidence: 99%

Triphenyl phosphate as an Efficient Electrolyte Additive for Ni-rich NCM Cathode Materials

Jung

Yim

2021

J. Electrochem. Sci. Technol

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Nickel-rich lithium nickel-cobalt-manganese oxides (NCM) are viewed as promising cathode materials for lithium-ion batteries (LIBs); however, their poor cycling performance at high temperature is a critical hurdle preventing expansion of their applications. We propose the use of a functional electrolyte additive, triphenyl phosphate (TPPa), which can form an effective cathode-electrolyte interphase (CEI) layer on the surface of Ni-rich NCM cathode material by electrochemical reactions. Linear sweep voltammetry confirms that the TPPa additive is electrochemically oxidized at around 4.83 V (vs. Li/ Li +) and it participates in the formation of a CEI layer on the surface of NCM811 cathode material. During high temperature cycling, TPPa greatly improves the cycling performance of NCM811 cathode material, as a cell cycled with TPPa-containing electrolyte exhibits a retention (133.7 mA h g-1) of 63.5%, while a cell cycled with standard electrolyte shows poor cycling retention (51.3%, 108.3 mA h g-1). Further systematic analyses on recovered NCM811 cathodes demonstrate the effectiveness of the TPPa-based CEI layer in the cell, as electrolyte decomposition is suppressed in the cell cycled with TPPa-containing electrolyte. This confirms that TPPa is effective at increasing the surface stability of NCM811 cathode material because the TPPa-initiated PO x-based CEI layer prevents electrolyte decomposition in the cell even at high temperatures.

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Silyl-group functionalized organic additive for high voltage Ni-rich cathode material

Cited by 33 publications

References 48 publications

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

Ni‐Rich Layered Cathode Materials by a Mechanochemical Method for High‐Energy Lithium‐Ion Batteries

Triphenyl phosphate as an Efficient Electrolyte Additive for Ni-rich NCM Cathode Materials

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