Al2O3 surface coating on LiCoO2 through a facile and scalable wet-chemical method towards high-energy cathode materials withstanding high cutoff voltages

Zhou, Aijun; Liu, Qin; Wang, Yi; Wang, Weihang; Xu, Yun; Hu, Wentao; Zhang, Long; Yu, Xiqian; Li, Jingze; Li, Hong

doi:10.1039/c7ta07312g

Cited by 143 publications

(97 citation statements)

References 65 publications

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“…The yellow peak at higher binding energy of 531.7 eV was associated with oxygen-containing adsorbed species, which can result from the reaction of LCO particles in open air or O atoms on the extreme surface of LiCoO 2 with a deficient coordination 20,26 . The O 1s peaks of Al 2 O 3 and LiAlO 2 , which are usually located at 531.7 eV and 531.0 eV, respectively, merged with the yellow peak 16,20 . The binding energy of LiAlO 2 was a little smaller than that of Al 2 O 3 , due to the lower electronegativity of Li compared to Al 15,27 .…”

Section: Resultsmentioning

confidence: 99%

“…In spite of these achievements, research on operating LCO cells >4.55 V has been reported rarely. It is intrinsically difficult to avoid the irreversible phase transition from O3 to H1-3 at voltages >4.55 V, which results in most of the modified LCO cells having a reversible capacity <180 mAh g −1 at 0.2 C. If the cut-off voltage is improved from 4.5 V to 4.6 V, an excess initial capacity of ~ 25 mAh g −1 could be obtained 16 .…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical surface passivation of LiCoO2 particles at ultrahigh voltage and its applications in lithium-based batteries

et al. 2018

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Lithium cobalt oxide, as a popular cathode in portable devices, delivers only half of its theoretical capacity in commercial lithium-ion batteries. When increasing the cut-off voltage to release more capacity, solubilization of cobalt in the electrolyte and structural disorders of lithium cobalt oxide particles are severe, leading to rapid capacity fading and limited cycle life. Here, we show a class of ternary lithium, aluminum, fluorine-modified lithium cobalt oxide with a stable and conductive layer using a facile and scalable hydrothermal-assisted, hybrid surface treatment. Such surface treatment hinders direct contact between liquid electrolytes and lithium cobalt oxide particles, which reduces the loss of active cobalt. It also forms a thin doping layer that consists of a lithium-aluminum-cobalt-oxide-fluorine solid solution, which suppresses the phase transition of lithium cobalt oxide when operated at voltages >4.55 V.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical surface passivation of LiCoO2 particles at ultrahigh voltage and its applications in lithium-based batteries

et al. 2018

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“…Metal oxides and metal phosphates have been tested thoroughly as coating species in light of their extraordinary stability at high voltage as far as both their chemical and electrochemical stability are concerned. For example, Al 2 O 3 and AlPO 4 are found to be very effective in improving the cycling performance of LiCoO 2 (LCO) when the LCO surface was suitably treated. In recent years, unique coatings with delicate designed functions have also been developed to not only protect the cathode materials but also help to bring into full display of their electrochemical potential.…”

Section: Precise Surface Control Of Cathode Materialsmentioning

confidence: 99%

Precise Surface Engineering of Cathode Materials for Improved Stability of Lithium‐Ion Batteries

Liu

Lin

Sun

et al. 2019

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As lithium‐ion batteries continue to climb to even higher energy density, they meanwhile cause serious concerns on their stability and reliability during operation. To make sure the electrode materials, particularly cathode materials, are stable upon extended cycles, surface modification becomes indispensable to minimize the undesirable side reaction at the electrolyte–cathode interface, which is known as a critical factor to jeopardizing the electrode performance. This Review is targeted at a precise surface control of cathode materials with focus on the synthetic strategies suitable for a maximized surface protection ensured by a uniform and conformal surface coating. Detailed discussions are taken on the formation mechanism of the designated surface species achieved by either wet‐chemistry routes or instrumental ones, with attention to the optimized electrochemical performance as a result of the surface control, accordingly drawing a clear image to describe the synthesis–structure–performance relationship to facilitate further understanding of functional electrode materials. Finally, perspectives regarding the most promising and/or most urgent developments for the surface control of high‐energy cathode materials are provided.

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“…One of the main reoccurring issues concerns the reproducibility of coating layers’ properties. The coating effects change significantly in response to synthetic methods and conditions, even for the same combination of electrode and coating material . Generally, the interaction between the coating material and the intercalation electrode leads to redistribution of electrons and ions, which can alter the properties of both at the interface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Chemical Bonding States on Lithium Intercalation Properties of Surface‐Modified Lithium Cobalt Oxide

Hata

Hirayama

Suzuki

et al. 2019

Batteries & Supercaps

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Understanding interfacial reactions between surface‐modified lithium intercalation cathodes and organic electrolytes facilitates the design of highly functional cathodes for lithium‐ion batteries. Here, the chemical bonding state between a LiCoO2 cathode and a ZrO2−x surface layer is controlled by pulsed arc plasma deposition using different ion energies. The lithium intercalation properties and interfacial structure changes are subsequently analyzed. The Zr−O−Co‐modified surface formed by interaction between ZrO2−x and LiCoO2 provides superior cycle stability under high‐voltage operation (2.8–4.5 V). X‐ray photoemission spectroscopy clarifies that the Zr−O−Co surface forms highly adhesive ZrOxFy as a cathode electrolyte interphase (CEI). The chemical bonding state at the ZrO2−x/LiCoO2 interface affects the reactivity of ZrO2−x with electrolyte species as well as the architecture of the CEI, which may determine the cell performances of lithium intercalation cathodes.

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Al₂O₃ surface coating on LiCoO₂ through a facile and scalable wet-chemical method towards high-energy cathode materials withstanding high cutoff voltages

Abstract: A low-cost and eco-friendly solution coating of nanoscale Al2O3 addresses the high-voltage fast degradation of LiCoO2.

Cited by 143 publications

References 65 publications

Electrochemical surface passivation of LiCoO2 particles at ultrahigh voltage and its applications in lithium-based batteries

Electrochemical surface passivation of LiCoO2 particles at ultrahigh voltage and its applications in lithium-based batteries

Precise Surface Engineering of Cathode Materials for Improved Stability of Lithium‐Ion Batteries

Effect of Surface Chemical Bonding States on Lithium Intercalation Properties of Surface‐Modified Lithium Cobalt Oxide

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