Ultrathin CeO2 coating for improved cycling and rate performance of Ni-rich layered LiNi0.7Co0.2Mn0.1O2 cathode materials

Dong, Shengde; Yuan, Zhenhong; Hai, Chunxi; Zeng, Jinbo; Sun, Yuhan; Shen, Yue; Li, Xiang; Ren, Xiaopeng; Qi, Guicai; Zhang, Xinxing; Ma, Luxiang

doi:10.1016/j.ceramint.2018.09.145

Cited by 75 publications

(34 citation statements)

References 51 publications

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“…Apart from metal phosphates, [ 28,29 ] metal fluorides, [ 30–34 ] active electrode materials, [ 35–37 ] and carbon, [ 38–40 ] the most commonly used materials for the modification of cathode material surfaces are a vast variety of metal oxides, e.g., SiO 2 , [ 41 ] Al 2 O 3 , [ 42,43 ] TiO 2 , [ 44 ] V 2 O 5 , [ 17 ] ZrO 2 , [ 42,45 ] ZnO, [ 46 ] MgO, [ 42 ] Co 3 O 4 , [ 47 ] CeO 2 , [ 48 ] and so on. Among these Al 2 O 3 is the most established coating material.…”

Section: Introductionmentioning

confidence: 99%

“…Commonly used methods for applying coatings on cathode materials are wet chemical, [ 17,41,48,52 ] sol–gel, [ 43,45 ] and atomic layer deposition (ALD) coating. [ 42,46,53 ] However, solvent‐based coating approaches have recently become less favored because they require subsequent heating and drying steps, which cause additional energy costs.…”

Section: Introductionmentioning

confidence: 99%

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Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al₂O₃) Improving the Performance of Lithium‐Ion Batteries

et al. 2021

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Surface coating is a crucial method to mitigate the aging problem of high‐Ni cathode active materials (CAMs). By avoiding the direct contact of the CAM and the electrolyte, side reactions are hindered. Commonly used techniques like wet or ALD coating are time consuming and costly. Therefore, a more cost‐effective coating technique is desirable. Herein, a facile and fast dry powder coating process for CAMs with nanostructured fumed metal oxides are reported. As the model case, the coating of high‐Ni NMC (LiNi0.7Mn0.15Co0.15O2) by nanostructured fumed Al2O3 is investigated. A high coverage of the CAM surface with an almost continuous coating layer is achieved, still showing some porosity. Electrochemical evaluation shows a significant increase in capacity retention, cycle life and rate performance of the coated NMC material. The coating layer protects the surface of the CAM successfully and prevents side reactions, resulting in reduced solid electrolyte interface (SEI) formation and charge transfer impedance during cycling. A mechanism on how the coating layer enhances the cycling performance is hypothesized. The stable coating layer effectively prevents crack formation and particle disintegration of the NMC. In depth analysis indicates partial formation of LixAl2O3/LiAlO2 in the coating layer during cycling, enhancing lithium ion diffusivity and thus, also the rate performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al₂O₃) Improving the Performance of Lithium‐Ion Batteries

et al. 2021

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“…Various techniques have been used to apply thin coating layers on CAM‐surfaces, like wet‐chemical deposition, [5,31,32] sol‐gel deposition, [33,34] atomic layer deposition (ALD), [35–37] physical vapor deposition (PVD) [38] and chemical vapor deposition (CVD) [39–41] . Methods involving solvents produce waste, require an additional filter step and subsequent heating/drying processes, which may be unwanted in terms of economic and environmental sustainability.…”

Section: Introductionmentioning

confidence: 99%

Improved Cycling Performance of High‐Nickel NMC by Dry Powder Coating with Nanostructured Fumed Al₂O₃, TiO₂, and ZrO₂: A Comparison

Herzog

Esken

Janek

2021

Batteries & Supercaps

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Surface coating is an effective concept to protect layered cathode active materials (CAMs) in lithium ion batteries from detrimental side reactions. Dry powder coating is a fast and cost‐effective coating process, and here we transfer this coating approach from Al2O3 to nanostructured fumed TiO2 and ZrO2 coatings on the same NMC (Li[Ni,Mn,Co]O2) material. Using similar processing, this allows a direct comparison of the characteristics of the achieved coating layers and their influence on the cycling performance of high‐nickel NMC. The nanostructured small oxide aggregates result in a quite homogeneous coating layer with a certain porosity around each CAM particle. Significantly enhanced long‐term cycling stability is observed, with a trend of increasing stability in the series ZrO2

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“…The electrochemical potential of Ni 2+ ↔ Ni 4+ is lower than that of Co 3+ ↔ Co 4+ ; therefore, increasing the Ni composition in the layered structure of an NCM cathode material allows greater utilization of the specific capacity of the NCM cathode material, thereby improving the energy density of LIBs [9][10][11][12]. Many attempts have been made to develop Ni-rich NCM cathode materials, such as NCM622 [13][14][15], NCM721, NCM712 [16][17][18][19][20], and NCM811, to increase the specific capacity of the cell [21][22][23][24][25]. However, despite their obvious advantages, NCM materials still suffer from poor cycling performance, especially at high temperature.…”

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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Ultrathin CeO2 coating for improved cycling and rate performance of Ni-rich layered LiNi0.7Co0.2Mn0.1O2 cathode materials

Cited by 75 publications

References 51 publications

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al₂O₃) Improving the Performance of Lithium‐Ion Batteries

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al₂O₃) Improving the Performance of Lithium‐Ion Batteries

Improved Cycling Performance of High‐Nickel NMC by Dry Powder Coating with Nanostructured Fumed Al₂O₃, TiO₂, and ZrO₂: A Comparison

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

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Ultrathin CeO2 coating for improved cycling and rate performance of Ni-rich layered LiNi0.7Co0.2Mn0.1O2 cathode materials

Cited by 75 publications

References 51 publications

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al2O3) Improving the Performance of Lithium‐Ion Batteries

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al2O3) Improving the Performance of Lithium‐Ion Batteries

Improved Cycling Performance of High‐Nickel NMC by Dry Powder Coating with Nanostructured Fumed Al2O3, TiO2, and ZrO2: A Comparison

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

Contact Info

Product

Resources

About

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al₂O₃) Improving the Performance of Lithium‐Ion Batteries

Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al₂O₃) Improving the Performance of Lithium‐Ion Batteries

Improved Cycling Performance of High‐Nickel NMC by Dry Powder Coating with Nanostructured Fumed Al₂O₃, TiO₂, and ZrO₂: A Comparison