Electrochemical and In Situ Synchrotron XRD Studies on Al[sub 2]O[sub 3]-Coated LiCoO[sub 2] Cathode Material

Liu, Lijun; Chen, Liquan; Huang, Xuejie; Yang, Xiao‐Qing; Yoon, Won‐Sub; Lee, H. S.; McBreen, J.

doi:10.1149/1.1772781

Cited by 113 publications

(82 citation statements)

References 16 publications

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“…9 in Ref. [109]), which indicated that the bulk structure of the commercial LiCoO 2 cathode material did not reversibly transform back from H2 (the phase at the end of a 5.2 V over-charge) to H1 (the phase of commercial LiCoO 2 ). When the Al 2 O 3 -coated LiCoO 2 cathode was charged to 5.2 V vs Li þ /Li, the in-situ XRD patterns indicate that the material experiences a series of phase transitions, from H1 to H2, and then to O1a, and finally to O1 during the initial charge process.…”

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confidence: 97%

“…We performed in-situ XRD studies at the National Synchrotron Light Source (NSLS) at the Brookhaven National Laboratory, in collaboration with Yang et al [109] For brevity, Figure 14 shows partial results of the in-situ XRD patterns during discharge. It was found that the XRD patterns of commercial LiCoO 2 remain unchanged during the whole discharge process (Fig.…”

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Research on Advanced Materials for Li‐ion Batteries

et al. 2009

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In order to address power and energy demands of mobile electronics and electric cars, Li‐ion technology is urgently being optimized by using alternative materials. This article presents a review of our recent progress dedicated to the anode and cathode materials that have the potential to fulfil the crucial factors of cost, safety, lifetime, durability, power density, and energy density. Nanostructured inorganic compounds have been extensively investigated. Size effects revealed in the storage of lithium through micropores (hard carbon spheres), alloys (Si, SnSb), and conversion reactions (Cr2O3, MnO) are studied. The formation of nano/micro core–shell, dispersed composite, and surface pinning structures can improve their cycling performance. Surface coating on LiCoO2 and LiMn2O4 was found to be an effective way to enhance their thermal and chemical stability and the mechanisms are discussed. Theoretical simulations and experiments on LiFePO4 reveal that alkali metal ions and nitrogen doping into the LiFePO4 lattice are possible approaches to increase its electronic conductivity and does not block transport of lithium ion along the 1D channel.

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Research on Advanced Materials for Li‐ion Batteries

et al. 2009

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“…The important factor that limits the cycle life of these batteries is an increase in the impedance of both the anode and the cathode, which relates to the formation and thickening of the SEI film. Liu et al [11] demonstrated that, by in situ synchrotron X-ray diffraction investigations, the Al 2 O 3 -coated LiCoO 2 experiences all the phase transitions that the bare LiCoO 2 does but with a better structural reversibility even if it is charged to 4.7 V versus Li + /Li. In brief, the electrochemical behavior of commonly used cathode materials for Li-ion batteries (such as LiCoO 2 , LiNiO 2 and LiMn 2 O 4 ) to some extent strongly depends on their surface chemistry in solutions, in a similar way as those found for electrochemical response of lithiated carbonaceous anodes in the same solutions.…”

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LiCoO2 electrode/electrolyte interface of Li-ion batteries investigated by electrochemical impedance spectroscopy

Zhuang

Fan

et al. 2007

Sci. China Ser. B-Chem.

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The storage behavior and the first delithiation of LiCoO 2 electrode in 1 mol/L LiPF 6 -EC : DMC : DEC electrolyte were investigated by electrochemical impedance spectroscopy (EIS). It has found that, along with the increase of storage time, the thickness of SEI film increases, and some organic carbonate lithium compounds are formed due to spontaneous reactions occurring between the LiCoO 2 electrode and the electrolyte. When electrode potential is changed from 3.8 to 3.95 V, the reversible breakdown of the resistive SEI film occurs, which is attributed to the reversible dissolution of the SEI film component. With the increase of electrode potential, the thickness of SEI film increases rapidly above 4.2 V, due to overcharge reactions. The inductive loop observed in impedance spectra of the LiCoO 2 electrode in Li/LiCoO 2 cells is attributed to the formation of a Li 1-x CoO 2 /LiCoO 2 concentration cell. Moreover, it has been demonstrated that the lithium-ion insertion-deinsertion in LiCoO 2 hosts can be well described by both Langmuir and Frumkin insertion isotherms, and the symmetry factor of charge transfer has been evaluated at 0.5.Li-ion batteries, LiCoO 2 , EIS, SEI film, inductance

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“…where e is the elementary electronic charge and E g is the energy separation E L À E H between the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO) [53]. The SEI passivating layer at the electrode/ electrolyte boundary gives a kinetic stability to the cell for V o larger than E g .…”

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Safety Aspects of Li-Ion Batteries

et al. 2016

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Lithium-ion batteries have dominated the battery industry for the past several years in portable electronic devices due to their high volumetric and gravimetric energy densities. It was expected that the success of these batteries in small scale applications would translate to large scale applications, which would have an important impact in the future of the environment by improving energy efficiency and reducing pollution. Safety of lithium-ion rechargeable batteries has been the technical obstacle for high power demand applications [1]. Lithium ion batteries under normal usage are generally safe. However, safety of Li-ion battery under abusive conditions is still a technical barrier for applications such as hybrid electric vehicles (HEV) and electric vehicles (EV), and the safety too often relies on the battery monitoring system (BMS). This thermal runaway not only is a safety hazard but also hinders the performance of lithium ion batteries eventually.Even though the mechanism of thermal runaway is initiated by the anode in combination with the electrolyte [2], the rapid temperature rise in the cell, which dominates the overall heat generated during this process, is produced by the cathode reacting with the electrolyte [3,4]. Therefore, it is of utmost importance to find a more structurally stable cathode in order to use lithium batteries at their fullest potential [5].Lithium ion cells have historically used lithium metal oxides as cathode materials due to their high capacity for lithium intercalation, and suitable chemical and physical properties required for Li-ion electrodes. Layered materials with LiMO 2 structure, where M ¼ Co, Ni, Mn, or a combination of these metals, have been the most extensively used and investigated cathodes. These types of cathodes show excellent performance, but suffer from higher cost, toxicity (LiCoO 2 ), and thermal instability (LiNiO 2 ). In order to avoid these problems, another lithium metal oxide material with spinel structure LiMn 2 O 4 has been proposed to substitute the layered materials. This oxide is inexpensive and environmentally friendly, but has

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Electrochemical and In Situ Synchrotron XRD Studies on Al[sub 2]O[sub 3]-Coated LiCoO[sub 2] Cathode Material

Cited by 113 publications

References 16 publications

Research on Advanced Materials for Li‐ion Batteries

Research on Advanced Materials for Li‐ion Batteries

LiCoO2 electrode/electrolyte interface of Li-ion batteries investigated by electrochemical impedance spectroscopy

Safety Aspects of Li-Ion Batteries

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